TECHNICAL REPORT ON AN AIRBORNE 

GEOPHYSICAL SURVEY OF CENTRAL 

OKLAHOMA 

Contract No. G17PC00038 

FOR THE 

UNITED STATES GEOLOGICAL SURVEY 

BY 

GOLDAK AIRBORNE SURVEYS 

November, 2017 
Goldak Airborne Surveys 

2 Hangar Rd. 

Saskatoon, Saskatchewan 

Tel: (306) 249-4474 

Fax: (306) 249-4475 

Email: info@goldak.ca 

URL: www.goldak.ca

 
Contents 

1 INTRODUCTION ...................................................................................................................................... 1 

2 SURVEY AREA LOCATION ....................................................................................................................... 2 

3 CONTRACT SPECIFICATIONS .................................................................................................................. 3 

3.1 Line Spacing................................................................................................................................... 3 

3.1.1 Block 123 ................................................................................................................................... 3 

3.1.2 Block 4 ....................................................................................................................................... 3 

3.1.3 Block 5 ....................................................................................................................................... 3 

3.2 Altitude.......................................................................................................................................... 3 

3.3 Diurnal Specifications .................................................................................................................... 4 

3.4 Magnetic Noise ............................................................................................................................. 4 

4 AIRCRAFT AND EQUIPMENT .................................................................................................................. 5 

4.1 Aircraft .......................................................................................................................................... 5

4.2 Airborne Systems .......................................................................................................................... 6 

4.2.1 Data Acquisition System ........................................................................................................... 6 

4.2.2 Magnetometers and Compensation ......................................................................................... 6 

4.2.3 GNSS Positioning and Navigation .............................................................................................. 7 

4.2.4 Radar Altimeters ....................................................................................................................... 7 

4.2.5 Barometric Altimeter ................................................................................................................ 8 

4.3 Ground Systems ............................................................................................................................ 8 

4.3.1 Magnetic Base Station .............................................................................................................. 8 

4.3.2 GNSS Base Station ................................................................................................................... 10 

4.4 Field Office Systems .................................................................................................................... 10 

4.4.1 Field Data Verification, Logging and Plotting .......................................................................... 10 

4.4.2 Software .................................................................................................................................. 11 

5 PERSONNEL .......................................................................................................................................... 12

6 DATA PROCESSING ............................................................................................................................... 13 

6.1 Positioning Data and Altitude Data ............................................................................................. 13 

6.2 Magnetic Data ............................................................................................................................. 13 

6.2.1 Initial Field Processing ............................................................................................................. 13 

6.2.2 Control-Line Levelling.............................................................................................................. 13 

6.2.3 Calculation and Removal of the International Geomagnetic Reference Field........................ 14 

6.2.4 Microlevelling of the Magnetic Data ...................................................................................... 14 
7 QUALITY CONTROL .............................................................................................................................. 15 

7.1 Tests and Calibrations ................................................................................................................. 15 

7.2 Daily Field Quality Control .......................................................................................................... 16 

7.3 Quality Control in the Home Office ............................................................................................ 16 

8 FINAL PRODUCTS ................................................................................................................................. 17 

8.1 Digital Profile Data ...................................................................................................................... 17 

8.2 Grids ............................................................................................................................................ 17

APPENDIX A – SURVEY BLOCK COORDINATES ............................................................................................ 18 

APPENDIX B – TEST AND CALIBRATION RESULTS........................................................................................ 21 

B.1 Compensation Figure of Merits ......................................................................................................... 21 

APPENDIX C – OPERATIONS REPORTS ........................................................................................................ 23 
Figures 

Figure 1 - Location of the Central Oklahoma Survey Blocks ......................................................................... 2 

Figure 2 - Aircraft C-GJBB at Altus ................................................................................................................. 5 

Figure 3 - Base Magnetometer Installation at Altus Airport ......................................................................... 8 

Tables 

Table 1 - Base Magnetometer Stations ......................................................................................................... 9 

Table 2 - Base GNSS Position Altus ............................................................................................................. 10 

Table 3 - Base GNSS Position Chickasha ..................................................................................................... 10 

Table 4 - Project Personnel ......................................................................................................................... 12 

Table 5 - Final Database Channels .............................................................................................................. 17 

Table 6 - Final Grids ..................................................................................................................................... 17 

Table 7 – Area 123 400 m spaced Coordinates ........................................................................................... 18 

Table 8 – Area 123 200 m spaced Coordinates ........................................................................................... 18 

Table 9 – Area 123 4000 m spaced Coordinates......................................................................................... 19 

Table 10 – Area 4 Coordinates .................................................................................................................... 19 

Table 11 – Area 5 Coordinates .................................................................................................................... 20 

Table 12 - C-GJBB Compensation Figure of Merit, August 13..................................................................... 21 

Table 13 - C-GJBB Compensation Figure of Merit, September 11 .............................................................. 22 

 
TECHNICAL REPORT ON AN AIRBORNE GEOPHYSICAL SURVEY OF CENTRAL OKLAHOMA

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1 INTRODUCTION 

This report describes an airborne geophysical survey conducted in over three distinct areas in Central

and Southern Oklahoma. This high sensitivity aeromagnetic surveys were carried out by Goldak 

Airborne Surveys (Goldak) on behalf of the United States Geological Survey (USGS) between August 11th 

and October 28th, 2017. 

Aircraft equipment operated included a cesium vapour magnetometer, a GPS real-time and postcorrected differential positioning system, as well as radar and barometric altimeters. All data were 

recorded digitally in GEDAS binary file format. 

Reference ground equipment included a GEM Systems GSM-19W Overhauser magnetometer and a 

Novatel 12 channel GPS base station which was set up at the base of operations for differential postflight corrections. 

Fifty one flights (including test and calibration sorties) were required to complete the survey. A total of 

44,551 line kilometres of high resolution magnetic was collected, processed and compiled. 

The largest of the blocks, Area 123, was flown with traverse lines spaced at 400 metres with control 

lines flown at a separation of 4 000 metres. Area 4 was flown with a traverse line spacing of 1 000 

metre sand control lines spaced at 10 000 metres. Area 5 used and 800 meter traverse line spacing and

an 8 000 metre control line spacing. Nominal terrain clearance was specified at 120 metres above 

ground for all blocks however regulations pertaining to flight over built up areas required the altitude to 

be raise in many instances. Altus, OK was used as the base of operations for the first part of the survey. 

Operations were moved to Chickasha, OK for the latter part of the project. 

All installations and equipment specifications are described in more detail in Section 4 of this report. 

Daily operational logs were kept and are included as Appendix B of this report. 

 
TECHNICAL REPORT ON AN AIRBORNE GEOPHYSICAL SURVEY OF CENTRAL OKLAHOMA

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2 SURVEY AREA LOCATION 

The survey was comprised of three blocks in Central and Southern Oklahoma. 

In relation to the state capital, Oklahoma City, Area 123 was centred 150 km SW at approximately 

34°47N, 98°48W. Area 4 was centred 150 km NW at about 36°33’N, 98°41’W while Area 5 was centred 

75 km to the NE of at roughly 36°53N, 96°56’W. 

The western part of Area 123 extends into the state of Texas. The original extents of Area 123 had to be 

altered as they overlapped Ft. Sill restricted airspace. Officials at Ft. Sill had initially indicated we could 

be accommodated but permission to enter the restricted space was not granted in a suitable time 

frame. 

Figure 1 - Location of the Central Oklahoma Survey Blocks 

The coordinates of each survey area are posted in Appendix A. 
TECHNICAL REPORT ON AN AIRBORNE GEOPHYSICAL SURVEY OF CENTRAL OKLAHOMA

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3 CONTRACT SPECIFICATIONS 

3.1 Line Spacing 

3.1.1 Block 123 

Traverse Lines: 

• bearing - N 20°E UTM 

• spacing - 400 metres, with 200m infill 

Control Lines: 

• bearing - N 110°W UTM 

• nominal spacing – 4 000 metres 

3.1.2 Block 4 

Traverse Lines: 

• bearing - N 146°E UTM 

• spacing – 1 000 metres 

Control Lines: 

• bearing - N 236°W UTM 

• nominal spacing – 10 000 metres 

3.1.3 Block 5 

Traverse Lines: 

• bearing - N 146°E UTM 

• spacing – 800 metres 

Control Lines: 

• bearing - N 236°W UTM 

• nominal spacing – 8 000 metres 

3.2 Altitude 

Altitude control was accomplished via a smooth drape constructed using STRM elevation data. 

Target nominal altitude: 120 m NTC (nominal terrain clearance) 

Actual Mean terrain clearances: 

 Area 123: 138 m 

 Area 4: 140 m 

 Area 5: 178 m 
TECHNICAL REPORT ON AN AIRBORNE GEOPHYSICAL SURVEY OF CENTRAL OKLAHOMA

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Tolerance: a maximum 30 m difference between traverse lines and control lines. To accomplish this, 

actual height deviations from the drape surface were not to exceed an envelope of +/- 15 metres at all

times. 

3.3 Diurnal Specifications 

The diurnal tolerances were as follows: 

• Monotonic changes in the magnetic field of 5 nT in any five-minute period. 

• Pulsations having periods of 5 minutes or less shall not exceed 2 nT. 

• Pulsations having periods between 5 and 10 minutes shall not exceed 4 nT. 

• Pulsations having periods between 10 and 20 minutes shall not exceed 8 nT. 

3.4 Magnetic Noise 

The magnetic noise was not to exceed 0.1 nT in the 4

th digital difference. 

All data was fully examined in the field and home office and was deemed to have met the above 

specifications. 

 
TECHNICAL REPORT ON AN AIRBORNE GEOPHYSICAL SURVEY OF CENTRAL OKLAHOMA

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4 AIRCRAFT AND EQUIPMENT 

4.1 Aircraft 

Type: ................................................................. Piper PA-31 Navajo with VG and LR Fuel Kit 

Registration: .................................................... & C-GJBB 

Engine hours: .................................................... C-GJBB (1700 hrs to TBO, approved on-condition) 

 .......................................................................... C-GJBG (1100 hrs to TBO, approved on-condition) 

Cruise Range: .................................................... 1500 km 

Survey Duration:6.5 hours plus reserve 

Max Climb Gradient: ......................................... 800 ft/NM 

Max Descent Gradient: .................................... 1000 ft/NM 

Cruising Speed: ................................................. 140 knots 

Aviation Fuel: .................................................... 100 LL aviation gasoline 

Fuel Consumption: ........................................... 200 pounds per hour total 

Oil Consumption ............................................... 0.2 liters per hour total 

Long Range Comm: ........................................... Iridium Sat Phone, SPOT 

ELT Frequency .................................................. 121.5 Mhz, 406 MHz 

Tail Stinger: ...................................................... 4 meter composite 

Wingtip Pods: ................................................... 1 meter composite 

FOM: ................................................................. 0.8 nT typical 

A single Piper PA-31 Navajo, registration C-GJBB, owned and operated by Goldak Airborne Surveys, was 

used on this survey. The aircraft magnetometers are installed in the 3-meter stinger attached to the rear 

fuselage and in the 1-metre composite pods attached to each wing-tip. The attitude sensing fluxgate 

magnetometer is positioned at the midpoint of the stinger. The three magnetometers form a two-axis 

gradiometer. 

The aircraft has been extensively modified, both mechanically and electrically, to minimize the effects of 

maneuvering on the measured magnetic field. This aircraft has typical a Figure of Merit result of less 

than 0.7 nT as measured to Geological Survey of Canada (GSC) specification. 

Figure 2 - Aircraft C-GJBB at Altus 
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4.2 Airborne Systems 

4.2.1 Data Acquisition System 

 Manufacturer: Goldak Exploration Technology Ltd.

 Type and Model Number: GEDAS 

 Sampling Rate: 10 Hz 

 Data Format: GEDAS binary 

All magnetic and positioning data are processed and recorded digitally by our GEDAS system. The 

GEDAS is an industrial rack-mount Intel Pentium based PC computer with multiple hard-drives, IO ports 

and ADAC devices. 

The GEDAS system records GNSS navigation records at 1Hz. Magnetic, radar altimeter and barometric 

altimeter data are recorded at 10 Hz. All data is tightly synchronized to GPS time with an accuracy of ± 1 

millisecond. Each data packet, on arrival to the data system is stamped with a system time with a 

resolution of 1 millisecond. Data files are organized on a flight-by-flight basis in a proprietary binary 

format. The data can then imported directly into Geosoft® via a custom import routine. 

4.2.2 Magnetometers and Compensation 

Aircraft Magnetometers: 

 Manufacturer: Geometrics 

 Type and Model Number: Cesium G-822A 

 Range in nT: 20,000 to 90,000 

 Sensitivity in nT: 0.005 

 Sampling Rate: 10 Hz 

Real-time Magnetic Compensator: 

 Manufacturer: RMS Instruments 

 Type and Model Number: AADCII 

 Range in nT: 20,000 to 100,000 

 Resolution in nT: 0.001 

 Sampling Rate: 20Hz 

The airborne magnetometers installed are a matched set of Geometrics G-822A optically pumped 

cesium vapour types with sensitivity of 0.005 nT. The magnetometer’s Larmor signal is decoupled and 

counted by a RMS Instruments AADCII compensator, and data are produced at a rate of 10 Hz with a 

resolution of 0.001 nT. The data bandwidth is from 0 to 0.9 Hz with an internal noise level of less than 

0.002 nT. 

Compensation mathematically “corrects” the magnetic data for noise due to aircraft motion and 

heading. Prior to the survey, the aircraft is taken to an area of low magnetic gradient at a high altitude 

(7000’ AGL +) and put through a series of rolls, pitches and yaws on each of the survey’s cardinal 

headings. The data collected from these maneuvers can then be used to form a model of the aircraft’s 

magnetic characteristics without the near influence of the local geology. 

The remaining magnetic distortion is quantified by a term known as the Figure of Merit, or FOM. The 

Geological Survey of Canada uses a figure of merit of 1.5 or less as standard survey criteria. 
TECHNICAL REPORT ON AN AIRBORNE GEOPHYSICAL SURVEY OF CENTRAL OKLAHOMA

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Two compensation flights pertinent to data collected were completed over the course of the survey. 

The results of these flights are posted in Appendix A. 

4.2.3 GNSS Positioning and Navigation 

Navigation System: 

Manufacturer Goldak Exploration Technology Ltd. 

Type and Model Number GENAV 

Displays 10” Color LCD data display 

 3D Autodrape LCD pilot display 

GNSS Receiver:

Manufacturer Novatel 

Type and Model Number: OEMV dual-frequency ProPakV3 (x1) 

System Resolution: <1 meter 

Overall accuracy: 3 m in real-time, <1m post-corrected 

Number Channels: 120 

Signal Tracking: GPS L1, L2, L2C, L5 

 GLONASS L1, L2 

 Galileo E1, E5 

The GNSS receiver in the survey aircraft was a GPS and GLONASS capable Novatel OEMV ProPakV3 120 

channel dual-frequency differential unit that communicates directly with the GEDAS system. This unit is 

used for navigation purposes and also logs data for post-flight differential corrections. 

GNSS signals can be affected by atmospheric and ionospheric effects which typically reduce the accuracy 

of the non-differential positioning to approximately 10 metres RMS. If a suitable stationary GPS 

receiver, on a known or assumed position, is used to record the apparent errors in the satellite range

data, those errors can be used to correct the moving receiver in the aircraft to an accuracy of 1 meter 

RMS. This compensation process is called differential correction and can be applied to the moving 

receiver in real time for higher dynamic accuracy, or applied later to find out where the aircraft was with 

high accuracy. These are called real-time and post-corrected differential positioning respectively. 

4.2.4 Radar Altimeters 

Radar Altimeter 1: 

Manufacturer Thompson 

Type and Model Number: CFS 530A 

Range: 0-8000 feet 

Resolution: 1 meter 

Accuracy: 2% 

Radar Altimeter 2: 

Manufacturer Terra 

Type and Model Number: TRA3000 – TRI40 

Range: 40-2500 feet 

Resolution: 3 metres 

Accuracy: 5-7% 
TECHNICAL REPORT ON AN AIRBORNE GEOPHYSICAL SURVEY OF CENTRAL OKLAHOMA

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4.2.5 Barometric Altimeter 

Manufacturer: Setra 

Type and Model Number: 270 

Range: -1000 to 10,000 feet 

Resolution: 1 meter 

4.3 Ground Systems 

4.3.1 Magnetic Base Station 

Base Station Magnetometer: 

 Manufacturer: GEM Systems 

 Type and Model Number: Overhauser GSM-19W 

 Range in nT: 20,000 to 120,000 

 Sensitivity in nT: 0.01 

 Sampling Rate: 1 Hz (5 Hz maximum) 

Base Station Data Loggers: 

 Manufacturer: Acumen 

 Type and Model Number: Data Bridge SDR-CF Serial Data Recorder 

 Media Type: Compact Flash 

Figure 3 - Base Magnetometer Installation at Altus Airport 
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A magnetic base station using a GEM Systems GSM19W Overhauser type proton precession 

magnetometer with GPS time base was set up at the base of operations. The setup was configured to 

log data both internally and externally to a compact flash card using an Acumen DataBridge SDR serial 

data recorder. The base station in Altus was set up on the west side of the airfield, 190 m west of the 

runway. The Base station in Chickasha was also set up on the airfield, on the east side of the runway, 

300 m from the apron. 

Installation Location Latitude Longitude Reference 

Value 

Flight 

Range 

Altus 34° 41' 51.9"N 99° 20' 26.6"W 49615nT 1 - 36

Chickasha 35° 05' 42.8"N 97° 57' 52.7"W 50265nT 37 - 51

Table 1 - Base Magnetometer Stations 
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4.3.2 GNSS Base Station 

Base GNSS Reciever: 

Manufacturer Novatel 

Type and Model Number: OEMV dual-frequency ProPakV3 (x1) 

System Resolution: <1 meter 

Overall accuracy: 3 m in real-time, <1m post-corrected 

Number Channels: 120 

Signal Tracking: GPS L1, L2, L2C, L5 

 

The base station receiver unit, like the airborne units, was a Novatel OEMV ProPakV3 whose data were 

logged by a battery-powered, industrial portable computer. A survey-grade GNSS base antenna 

designed to minimize multi-path errors was set up on the roof of the Friendship Inn in Altus for flights 1 

to 36 and on the roof of the Maverick Inn in Chickasha from flights 37. The precise position of the 

antenna was determined by collecting 9 hours of data then submitting the data to the NRCan’s online 

Precise Point Positioning (PPP) service. The following WGS84 coordinate was delivered: 

Longitude -99° 19 58.3355 

Latitude 34° 39 36.6274 

Elevation (MSL) 410.146 m 

Flight range 1 - 36 

Table 2 - Base GNSS Position Altus 

Longitude -97° 55' 59.2463 

Latitude 35° 01' 18.6143 

Elevation (MSL) 323.649 

Flight range 37 - 51 

Table 3 - Base GNSS Position Chickasha 

4.4 Field Office Systems 

4.4.1 Field Data Verification, Logging and Plotting 

Processing Computer: 

 Manufacturer: Lenovo 

 Type and Model Number: ThinkCentre / Intel i5 3.4 GHz 

Data Logging Computers: 

 Manufacturer: Lenovo 

 Type and Model Number: ThinkPad / Intel i5 3.4 GHz 

Plotters and Printers: 

 Manufacturer: Brother 

 Type and Model Number: HL-2270 
TECHNICAL REPORT ON AN AIRBORNE GEOPHYSICAL SURVEY OF CENTRAL OKLAHOMA

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Data backup: 

 Manufacturer: Western Digital 

 Type and Model Number: 1.5 TB external HDD 

4.4.2 Software 

Manufacturer: Geosoft®

 Function: Geophysical data processing 

 Type and Model Number: Oasis Montaj v 7.3 

 

Manufacturer: Waypoint Consulting 

 Function: GPS post-processing 

 Type and Model Number: GrafNav v 8.50 
TECHNICAL REPORT ON AN AIRBORNE GEOPHYSICAL SURVEY OF CENTRAL OKLAHOMA

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5 PERSONNEL 

The following Goldak personnel were involved in the Oklahoma project: 

Company President – Ben Goldak 

Pilot – Jay Mathieson 

Co-Pilot/ Instrument Operator – Dustin Biesenthal 

Field Manager/ QC – Bill Heath 

Flight Block Design – Bill Heath, Glen Carson 

Final Data Processing – Bill Heath 

Data Processing Manager – Glen Carson 

Logistics – Brenda Doherty, Glen Carson, Bill Heath

Aircraft Maintenance – Daniel Leppington 

Table 4 - Project Personnel 
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6 DATA PROCESSING 

6.1 Positioning Data and Altitude Data 

Processing of the positioning data takes place in the field and is performed on a post-flight basis. 

The following procedures are included in positioning and altitude data processing: 

1. The raw airborne GPS data are corrected using the corresponding GPS base station data and 

NovAtel® Inc.’s Waypoint® GrafNav® GNSS Post-Processing software suite. 

2. The corrected GPS World Geodetic System 1984 (WGS84) longitude, latitude and altitude are 

merged into a Geosoft® database with aircraft flight data and re-projected to the local UTM Zone 

14 WGS84 datum. Velocity is then calculated from the corrected positions. Corrected UTM coordinates are trimmed to online. 

3. The primary radar altimeter data is lagged by 0.9 seconds and the secondary radar altimeter 

data is lagged by 3.0 seconds. 

4. The digital elevation model is calculated by subtracting the radar altimeter data from the GPS 

altitude data. 

5. Quality-control procedures described in section 7.2 are performed. 

6.2 Magnetic Data 

6.2.1 Initial Field Processing 

Processing of the magnetic data begins in the field where the raw magnetic, positioning and altitude 

data from the aircraft acquisition systems is first imported into a Geosoft® Oasis montajTM database on a 

line basis. The magnetic base station data, logged during the corresponding flight time, were then 

merged with the flight data for display and quality control checks. 

1. A system latency correction, determined from the pre-survey lag test of 0.4 seconds for the tail 

magnetometer data and 0.3 seconds for the wing-tip magnetometer data, is then applied. 

2. A diurnal correction derived from the local magnetic base station data is applied to account for 

temporal variations in the total magnetic field. 

3. The raw, measured magnetic gradients are normalized using the known aircraft sensor 

separations and aircraft direction to give consistently signed gradient values in units of nT/m. A 

correction matrix, derived from the attitude data, is then applied scaling them to provide true 

longitudinal and transverse gradient values parallel to and perpendicular to the ideal line 

direction. 

4. Quality-control procedures described in section 7.2 are performed. 

6.2.2 Control-Line Levelling 

The intention of control-line levelling is to apply a smoothly-varying function to the measured data, 

which results in nearly identical values at the intersections of traverse and control lines. The most 

significant component of the correction is to accommodate the diurnal variation of the magnetic field.

Other sources of error are altitude errors, GPS positioning errors and system drift. 

Levelling of the total field data consists of the following steps: 
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1. Calculation of the positions of the survey-line–control-line intersection points and the extraction 

of mismatch values of the magnetic data between the line and control lines at these points. 

2. An iterative application of corrections, based of best-fit, first-order linear trends of mismatch 

values (with outliers removed), on the traverse and control lines until the resulting corrections 

approach zero. 

3. An iterative application of long-wavelength corrections on traverse and control lines determined 

by applying median and low-pass filters to the remaining intersection mismatches (with outliers 

removed) and then using Akima spline interpolation between the now-filtered intersection 

mismatch values. This enhances and isolates correction “features” that span several 

intersections. The lengths of the filters are based on the traverse-line–control-line intersection 

separations. In this case, the initial filter lengths spanned 10 control-line intersections on survey 

lines and 50 survey-line intersections on control lines. The number of intersections spanned is 

reduced in increments to an appropriate minimum until the correction approaches zero. 

4. Calculation of the first vertical derivative from the gridded data of the intermediate levelled 

total field using a 2-D fast Fourier transform (FFT) operator. 

5. An altitude correction derived by multiplying the calculated vertical gradient by the aircraft’s 

deviation from the planned surface height is then applied to the original unlevelled magnetic 

data. 

6. Steps 1 to 3 are then repeated using the altitude-corrected magnetic data. 

7. Manual inspection of the remaining intersection mismatches and reducing it to zero (where 

appropriate) by applying the necessary corrections to either the survey or tie lines. Special 

attention is paid to ensuring that the overall correction profiles are as smooth as possible and 

that there is no line-to-line correlation in the correction profiles, which implies a misapplied 

correction. 

8. The second vertical derivative of the total field grid is analyzed to ensure that the corrections 

are sufficient and appropriate. Features that appear along the survey lines in the second vertical 

derivative may be the result of over-correction or under-correction. In either case, the solution 

is to revise the correction profile at those intersections. 

6.2.3 Calculation and Removal of the International Geomagnetic Reference Field 

The International Geomagnetic Reference Field (IGRF) was calculated using the 2015 model year with a 

constant date, roughly the mid-point for each individual block, as the reference date (see table below). 

The corrected GPS altitude at each given survey point was specified as the elevation. This value was 

subtracted from the tie-line or microleveleld levelled data to obtain the residual magnetic field data. 

Survey Block Reference Date for 

IGRF Calculation 

Area 123 2017/09/21

Area 4 2017/09/16

Area 5 2017/10/09

6.2.4 Microlevelling of the Magnetic Data 

After control line levelling, any residual flight line noise or “corrugation” in the magnetic field data was 

further reduced using Paterson, Grant & Watson’s microlevelling technique. This technique first involves 

the generation of line-to-line noise profiles by applying frequency domain sixth-order, high-pass 
TECHNICAL REPORT ON AN AIRBORNE GEOPHYSICAL SURVEY OF CENTRAL OKLAHOMA

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Butterworth filter and a directional cosine filter perpendicular to the flight-line direction to the gridded 

data. This “decorrugation” grid is then sampled back into the database. The initial noise profile data is 

then limited to a user-defined maximum amplitude and then filtered using a Naudy–Dreyer non-linear 

filter to obtain the microlevelling correction. Finally, the correction and gridded microlevelled data are 

inspected to ensure no geological signal was removed and an overall improvement in the gridded data 

was achieved. 

The following parameters in Paterson, Grant & Watson’s “Miclev” routine were used for Area 123:

• Decorrugation wavelength cutoff: 1 600 m 

• Decorrugation grid cell size: 100 m 

• Naudy filter length: 1 000 m 

• Naudy filter tolerance: 0.0001 

• Amplitude limit: 2.0 nT 

The following parameters in Paterson, Grant & Watson’s “Miclev” routine were used for Area 5:

• Decorrugation wavelength cutoff: 3 200 m 

• Decorrugation grid cell size: 200 m 

• Naudy filter length: 1 000 m 

• Naudy filter tolerance: 0.0001 

• Amplitude limit: 1.0 nT 

No microlevelling was applied to the Area 4 data. 

7 QUALITY CONTROL 

7.1 Tests and Calibrations 

The full results of the tests and calibrations described below can be found in Appendix A. 

a) Compensation Figure of Merit 

Aircraft movements induce spurious magnetic fields, which are removed from the magnetic data by the 

compensator. The efficiency of this removal can be evaluated by conducting a test called a Figure of 

Merit (FOM). The aircraft flies a series of 3 manoeuvres of ±10° rolls, ±5° pitches and ±5° yaws in each 

of the traverse- and control-line directions in a magnetically quiet zone (low magnetic gradient). The

peak-to-peak amplitudes of the responses obtained on the magnetometer compensated channel are 

determined for each of the 3 manoeuvre types and for each of the 4 directions. The 12 values are then 

summed giving the Figure of Merit. 

Compensation figure of merit tests were performed by both aircraft after their initial arrival on site and 

before survey operations commenced. In addition, the calibration and tests were repeated after any 

significant change to the aircraft or its systems which may have altered its magnetic properties. 

In all calibration and subsequent tests performed by the aircraft, the resultant figures of merit for the tail 

and wing-tip sensors were below the specified threshold of 1.5 nT. 
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7.2 Daily Field Quality Control 

a) Positioning Data 

In a Geosoft® Oasis montajTM database, the corrected GPS data are inspected for gaps and positioning 

error as indicated by anomalous velocity changes or vertical offsets. The real-time positions are 

compared to the post-corrected positions for integrity check. 

Flight path is examined to detect horizontal deviations that exceed tolerances. Computed velocity is 

inspected and confirmed to be within tolerances. 

The radar altimeter and barometric altimeter data are inspected for anomalous conditions. The 

computed digital elevation model is compared against known topographical data. Vertical navigation is 

checked for deviations from the pre-determined flight surface that exceed tolerances. 

b) Magnetic Data 

Goldak Airborne Surveys’ data acquisition system is designed to allow the second pilot to monitor data

quality at all times. Both pilots have been trained to operate the equipment and recognize data 

problems. Automated systems are also in place to draw their attention to anomalous conditions. In 

addition, the field processor is continually monitoring the magnetic base station via radio link to be on 

the alert for poor diurnal conditions. The field processor maintains scheduled communication with the 

aircraft for flight-following purposes and to update the flight crew on weather and diurnal conditions. 

After a survey flight, the magnetic and measured gradient data are inspected on a line-by-line basis for 

gaps, spikes and other anomalous conditions. Magnetic noise levels are monitored using the fourth 

digital difference and visually. The magnetic base station data are examined for deviations that exceed 

the contract stated peak-to-peak magnitude and chord lengths. Reflights are assigned where 

necessary. 

A frequency domain plot of the uncompensated and compensated magnetic data is generated through 

fast Fourier transform on a line-by-line basis and inspected. Through this, the general ongoing 

performance of the magnetic compensation can be evaluated and any aircraft system-induced 

magnetic noise can be easily discerned. 

Grids of the total field and horizontal gradient data, along with flight path plots, are examined daily to 

visually compare the correlation of data between lines and across flights. 

7.3 Quality Control in the Home Office 

a) Review of field processed data 

At the home office, the results of the field processing are reviewed at regular intervals throughout the 

survey and following completion. 

b) Review of the final processed data 

The results of the levelling of the magnetic data are reviewed on a line-by-line basis through inspection 

of the total correction profile and intersection mismatch values. Final grid products are visually and

statistically inspected for overall quality and validity. 
TECHNICAL REPORT ON AN AIRBORNE GEOPHYSICAL SURVEY OF CENTRAL OKLAHOMA

17 

8 FINAL PRODUCTS 

8.1 Digital Profile Data 

Databases containing the magnetic and radiometric profile data were delivered in Geosoft® .GDB format. 

The fields included in each respective database are as follows: 

Channel Description Units

BaseMag_1 Base Station Magnetic Reading nT

Date Date YY-JulianDAY

DEM Digital Terrain (GPS_Z_CorrRadar_Alt) m 

direction Nominal Line Direction Degrees cw from N

Fiducial Fiducial Number -

Flight Flight Number -

GPS_Lat_Corr WGS84 Longitude Degrees

GPS_Lon_Corr WGS84 Latitude Degrees

GPS_Z_Corr Orthometric Height m

igrf IGRF Value nT

Line Line Number -

Mag_anom Residual Magnetic Field nT

Mag_B_Lag Lagged, Compensated Tail Mag nT

Mag_DiurCorr1 Base Station Corrected Tail Mag nT

Mag_level Levellled Tail Mag (Derived from 

Mag_B_Lag) nT 

Mag_miclev Microlevelled Mag* nT

Radar_Alt Radar Altimeter m

X WGS84 Zone 14N Easting m

Y WGS84 Zone 14N Northing m

Table 5 - Final Database Channels 

8.2 Grids 

Grids of the residual total magnetic field in UTM Zone 14N WGS84 datum coordinates we delivered in 

Geosoft .GRD format 

File Cell Size

Area_123_Mag_Anom.grd 100

Area_4_Mag_Anom.grd 250

Area_5_Mag_Anom.grd 200

Table 6 - Final Grids 
TECHNICAL REPORT ON AN AIRBORNE GEOPHYSICAL SURVEY OF CENTRAL OKLAHOMA

18 

APPENDIX A – SURVEY BLOCK COORDINATES 

The WGS84 UTM Zone 14 North coordinates for the survey blocks appear below: 

Area 123 

Vertex Easting Northing Vertex Easting Northing

1 496689 3883145 20 570856 3851833

2 496689 3893227 21 568115 3844273

3 405275 3913026 22 570679 3843389

4 387137 3863345 23 565728 3829773

5 387329 3853049 24 556090 3829419

6 481256 3832751 25 552046 3818314

7 499693 3809175 26 510296 3818448

8 620476 3809981 27 514785 3831980

9 622890 3816979 28 510263 3841894

10 609699 3821759 29 503126 3844510

11 589826 3841688 30 502803 3842896

12 557387 3874977 31 491016 3846997

13 551900 3859786 32 492146 3850872

14 551250 3860040 33 489465 3851841

15 548179 3851836 34 492437 3859980

16 550495 3850977 35 497891 3859526

17 552102 3854713 36 497762 3870276

18 554963 3853659 37 492309 3870917

19 556267 3857182 38 496689 3883145

Table 7 – Area 123 400 m spaced Coordinates 

Area 123 200 metre Infill 

Vertex Easting Northing

1 491039 3846992

2 492214 3850808

3 489642 3851830

4 492640 3859991

5 507292 3859633

6 519234 3857844

7 516713 3850314

8 516560 3850433

9 513306 3841540

10 503544 3844470

11 502947 3842954

12 491056 3847009

13 491039 3846992

Table 8 – Area 123 200 m spaced Coordinates 
TECHNICAL REPORT ON AN AIRBORNE GEOPHYSICAL SURVEY OF CENTRAL OKLAHOMA

19 

Area 123 4 00m Infill Lines 

Vertex Easting Northing

1 498356 3861260

2 498356 3870119

3 493722 3871346

4 501218 3891108

5 555326 3871754

6 551237 3860033

7 550965 3860579

8 548239 3851856

9 545104 3853082

10 543741 3848449

11 535973 3851311

12 533928 3847903

13 524524 3851720

14 523298 3847767

15 517710 3849948

16 523843 3866439

17 521662 3866439

18 518936 3858807

19 498765 3860987

Table 9 – Area 123 4000 m spaced Coordinates 

Area 4 

Vertex Easting Northing

1 506300 4000631

2 560065 4037464

3 530608 4079229

4 477440 4042797

Table 10 – Area 4 Coordinates 
TECHNICAL REPORT ON AN AIRBORNE GEOPHYSICAL SURVEY OF CENTRAL OKLAHOMA

20 

Area 5 

Vertex Easting Northing

1 651416 4029641

2 693668 4058271

3 714427 4027756

4 715645 3926779

5 693527 3912269

6 679559 3932600

7 657305 3917524

8 624935 3965380

9 672476 3998635

10 651416 4029641

11 651416 4029641

12 693668 4058271

13 714427 4027756

Table 11 – Area 5 Coordinates 
TECHNICAL REPORT ON AN AIRBORNE GEOPHYSICAL SURVEY OF CENTRAL OKLAHOMA

21 

APPENDIX B – TEST AND CALIBRATION RESULTS 

B.1 Compensation Figure of Merits 

Table 12 - C-GJBB Compensation Figure of Merit, August 13 

Project Pilot

Flight Copilot

Aircraft Processor

Date

Julian Day

MB FOM 0.79

MR FOM

ML FOM

MT FOM

GX FOM Air Time 0.9

GY FOM Test Time 0.5

GZ FOM Ferry Time 0.4

1.90E+00 3.65E-02 51.9 53.9

2.21E+00 4.98E-02 42.7 58.3

3.03E-01 2.11E-02 14.3 16.5

5.73E+00 1.03E-01 55.8 42.6

1.72E+00 1.54E-01 111.5 65.3

4

North East South West Sum

Pitch 0.09 0.09 0.09 0.09 0.36

Roll 0.04 0.04 0.04 0.05 0.17

Yaw 0.04 0.09 0.04 0.09 0.26

Sum 0.17 0.22 0.17 0.23 0.79

Compensation / Figure of Merit Test Analysis

Central Oklahoma

2

C-GJBB Heath

Mathieson

Biesenthal

Left Wing M1

2017-08-13

225

Test Summary

Test Location

Reason for Comp / FOM

Altus

Start of Project

RMS AADCII Compensator Statistics

Uncomp Std 

Dev

Comp Std 

Dev IR Solution Norm

Right Wing M2

Tail Top M3

Tail Lower M4

Lateral Grad G1

Long Grad G2

Vert Grad G3

Memory Slot

FOM Analysis

 Bottom Tail Magnetometer (MBc)
TECHNICAL REPORT ON AN AIRBORNE GEOPHYSICAL SURVEY OF CENTRAL OKLAHOMA

22 

Table 13 - C-GJBB Compensation Figure of Merit, September 11 

Project Pilot

Flight Copilot

Aircraft Processor

Date

Julian Day

MB FOM 0.87

MR FOM

ML FOM

MT FOM

GX FOM Air Time 0.6

GY FOM Test Time 0.6

GZ FOM Ferry Time

1.78E+00 3.67E-02 54 53.7

2.28E+00 5.27E-02 43.2 58.4

2.84E-01 2.44E-02 11.6 17.1

5.59E+00 1.07E-01 52.1 43.2

1.80E+00 1.61E-01 112.1 63.6

5

North East South West Sum

Pitch 0.11 0.08 0.07 0.11 0.37

Roll 0.03 0.04 0.02 0.04 0.13

Yaw 0.11 0.1 0.08 0.08 0.37

Sum 0.25 0.22 0.17 0.23 0.87

Right Wing M2

Tail Top M3

Tail Lower M4

Lateral Grad G1

Long Grad G2

Vert Grad G3

Memory Slot

FOM Analysis

 Bottom Tail Magnetometer (MBc)

Left Wing M1

2017-09-11

254

Test Summary

Test Location Altus

Reason for Comp / FOM for orientation of Northern 

Block Lines

RMS AADCII Compensator Statistics

Uncomp Std 

Dev

Comp Std 

Dev IR Solution Norm

C-GJBB Heath

Compensation / Figure of Merit Test Analysis

Central Oklahoma Mathieson

26 Biesenthal
TECHNICAL REPORT ON AN AIRBORNE GEOPHYSICAL SURVEY OF CENTRAL OKLAHOMA

23 

APPENDIX C – OPERATIONS REPORTS

to

Aircraft: 29075

Pilot: 0

Copilot:

Processor: 0

Base:

Contact:

Flight 

Aircraft

Ferry

Test

Survey

Total

Flown

Accepted

Rejected

Weather

Diurnal

Equipent

Crew

Mon C-GJBB

August 07

Tues C-GJBB

August 08

Wed C-GJBB

August 09

Thurs C-GJBB

August 10

Fri 1 C-GJBB 1.3 1.3 60

August 11

Sat C-GJBB 100

August 12

Sun 2 C-GJBB 0.9 0.9 80

August 13

2.2 0 0 2.2 0 0 0

0 0 0 0 0 0 0

Weekly Total

Total to Date

Overcast for most of the day, clearing around 5 pm local

compensation flight performed => OK FOM of 0.78

Cloud, T-Storms most of the day. 

Basemags set up

Comp Flight attempted

Cloud T-Storms

Aircraft and crew leave Saskatoon. Clear customs and overnight

in Williston, ND

Arrive in Altus

Base GPS set up

Notes

Altus, OK

306-290-3881

Flight Times (h) Production (km) Unservicability (%)

Biesenthal Flown this week

Heath Flown to date

C-GJBB Project Total

Mathieson Remaining

Aircraft and Crew Summary

Goldak Airborne Surveys Operations Report

Central Oklahoma

August 07 August 13

2017
TECHNICAL REPORT ON AN AIRBORNE GEOPHYSICAL SURVEY OF CENTRAL OKLAHOMA

24 

to

Aircraft: 29075

Pilot: 22608

Copilot: 6467

Processor: 6467

Base:

Contact:

Flight 

Aircraft

Ferry

Test

Survey

Total

Flown

Accepted

Rejected

Weather

Diurnal

Equipent

Crew

Mon 3 C-GJBB 0.2 4.5 4.7 1140 1140

August 14

Tues 4 C-GJBB 0.2 6.2 6.4 1521 1521 50

August 15

Wed 5 C-GJBB 0.2 0.2 100

August 16

Thurs C-GJBB 100

August 17

Fri 6 C-GJBB 0.4 5.2 5.6 1162 1162

August 18

Sat 7 C-GJBB 0.1 5.8 5.9 1250 1250

August 19

Sun 8 C-GJBB 0.2 5.9 6.1 1394 1394

August 20

1.3 0 27.6 28.9 6467 6467 0

3.5 0 27.6 31.1 6467 6467 0

Aircraft and Crew Summary

Goldak Airborne Surveys Operations Report

USGS - Central Oklahoma

August 14 August 20

2017

C-GJBB Project Total

Mathieson Remaining

Biesenthal Flown this week

Heath Flown to date

Altus, OK

306-290-3881

Flight Times (h) Production (km) Unservicability (%)

Notes

Flight abbreviated for media event

Rain in the morning, clearing around noon.

Gear door problem, returned to base.

Red River A/C looking at the issue

gear door bring fixed

Weekly Total

Total to Date
TECHNICAL REPORT ON AN AIRBORNE GEOPHYSICAL SURVEY OF CENTRAL OKLAHOMA

25 

to

Aircraft: 29075

Pilot: 15487

Copilot: 7121

Processor: 13588

Base:

Contact:

Flight 

Aircraft

Ferry

Test

Survey

Total

Flown

Accepted

Rejected

Weather

Diurnal

Equipent

Crew

Mon 9 C-GJBB 0.3 5.8 6.1 1394 1394

August 21

Tues 10 C-GJBB 0.4 5.7 6.1 1394 1394

August 22

Wed 11 C-GJBG 1.3 0.5 1.8 118 103 15 90

August 23

Thurs 12 C-GJBB 0.5 5.7 6.2 1394 1394

August 24

Fri C-GJBB 100

August 25

Sat 13 C-GJBB 0.2 6.1 6.3 1493 1482 11

August 26

Sun 14 C-GJBB 0.3 5.8 6.1 1354 1354

August 27

3 0 29.6 32.6 7147 7121 26

6.5 0 57.2 63.7 13614 13588 26

Aircraft and Crew Summary

Goldak Airborne Surveys Operations Report

USGS - Central Oklahoma

August 21 August 27

2017

C-GJBB Project Total

Mathieson Remaining

Biesenthal Flown this week

Heath Flown to date

Altus, OK

306-290-3881

Flight Times (h) Production (km) Unservicability (%)

Notes

low overcast

heavy rain, low overcast

Weekly Total

Total to Date
TECHNICAL REPORT ON AN AIRBORNE GEOPHYSICAL SURVEY OF CENTRAL OKLAHOMA

26 

to September 3

Aircraft: 29075

Pilot: 8205

Copilot: 7282

Processor: 20870

Base:

Contact:

Flight 

Aircraft

Ferry

Test

Survey

Total

Flown

Accepted

Rejected

Weather

Diurnal

Equipent

Crew

Mon 15 C-GJBB 0.7 5.2 5.9 1268 1268

August 28

Tues 16 C-GJBB 0.6 5.4 6.0 1324 1324

August 29

Wed 17 C-GJBB 0.1 6.1 6.2 1346 1346

August 30

Thurs 18 C-GJBB 0.3 5.5 5.8 1193 1066 127

August 31

Fri C-GJBB 100

September 01

Sat 19 C-GJBB 0.3 5.7 6.0 1126 1126

September 02

Sun 20 C-GJBB 0.3 5.7 6.0 1152 1152

September 03

2.3 0 33.6 35.9 7409 7282 127

8.8 0 90.8 99.6 21023 20870 153

Weekly Total

Total to Date

Aircraft maintenance

Notes

Altus, OK

306-290-3881

Flight Times (h) Production (km) Unservicability (%)

Biesenthal Flown this week

Heath Flown to date

C-GJBB Project Total

Mathieson Remaining

Aircraft and Crew Summary

Goldak Airborne Surveys Operations Report

USGS - Central Oklahoma

August 28

2017
TECHNICAL REPORT ON AN AIRBORNE GEOPHYSICAL SURVEY OF CENTRAL OKLAHOMA

27 

to

Aircraft: 44671

Pilot: 20431

Copilot: 3370

Processor: 24240

Base:

Contact:

Flight 

Aircraft

Ferry

Test

Survey

Total

Flown

Accepted

Rejected

Weather

Diurnal

Equipent

Crew

Mon 21 C-GJBB 0.5 5.4 5.9 1221 1221

September 04

Tues C-GJBB 100

September 05

Wed 22 C-GJBB 0.4 5.1 5.5 848 848

September 06

Thurs 23 C-GJBB 0.5 3.8 4.3 546 527 19

September 07

Fri C-GJBB 100

September 08

Sat 24 C-GJBB 0.6 4.5 5.1 774 774

September 09

Sun C-GJBB 100

September 10

2 0 18.8 20.8 3389 3370 19

10.8 0 109.6 120.4 24412 24240 172

Weekly Total

Total to Date

Pilot is ill

Active Diurnal

Notes

High winds and turbulence

Altus, OK

306-290-3881

Flight Times (h) Production (km) Unservicability (%)

Biesenthal Flown this week

Heath Flown to date

C-GJBB Project Total

Mathieson Remaining

Aircraft and Crew Summary

Goldak Airborne Surveys Operations Report

USGS - Central Oklahoma

September 04 September 10

2017
TECHNICAL REPORT ON AN AIRBORNE GEOPHYSICAL SURVEY OF CENTRAL OKLAHOMA

28 

to

Aircraft: 44671

Pilot: 14878

Copilot: 2232

Processor: 29793

Base:

Contact:

Flight 

Aircraft

Ferry

Test

Survey

Total

Flown

Accepted

Rejected

Weather

Diurnal

Equipent

Crew

Mon C-GJBB 100

September 18

Tues C-GJBB 100

September 19

Wed C-GJBB 100

September 20

Thurs C-GJBB 100

September 21

Fri 30 C-GJBB 1.4 3.5 4.9 771 771

September 22

Sat 31 C-GJBB 2.1 3.1 5.2 646 646

September 23

Sun 32 C-GJBB 1.7 3.6 5.3 815 815

September 24

5.2 0 10.2 15.4 2232 2232 0

21.2 0.6 135.3 157.1 30214 29793 421

Aircraft and Crew Summary

Goldak Airborne Surveys Operations Report

USGS - Central Oklahoma

September 18 September 24

2017

C-GJBB Project Total

Mathieson Remaining

Bisenthal Flown this week

Heath Flown to date

Altus, OK

309-290-3881

Flight Times (h) Production (km) Unservicability (%)

Notes

High wind, turbulence, T-Storm activity

Low level wind shear, turbulence

Low level wind shear, turbulence

High wind and turbulence

Area4

Turbulent throughout

Area 4: 377 km...completes Area 4

Area 5: 269 km

Turbulent throughout

Weekly Total

Total to Date

Area 5

Turbulent
TECHNICAL REPORT ON AN AIRBORNE GEOPHYSICAL SURVEY OF CENTRAL OKLAHOMA

29 

to

Aircraft: 44671

Pilot: 9148

Copilot: 3212

Processor: 35523

Base:

Contact:

Flight 

Aircraft

Ferry

Test

Survey

Total

Flown

Accepted

Rejected

Weather

Diurnal

Equipent

Crew

Mon C-GJBB 100

October 02

Tues 36 C-GJBB 0.9 0.9 100

October 03

Wed C-GJBB 100

October 04

Thurs C-GJBB 

October 05

Fri 37 C-GJBB 1.1 5.0 6.1 1203 1203

October 06

Sat 38 C-GJBB 1.0 4.7 5.7 1001 1001

October 07

Sun 39 C-GJBB 0.9 4.8 5.7 1008 1008

October 08

3.9 0 14.5 18.4 3212 3212 0

30.7 0.6 160.6 191.9 35944 35523 421

Weekly Total

Total to Date

Rain, Thunderstorms

Relocated to Chickasha

Notes

Rain

Flight aborted. Low ceilings

Chickasha, OK

306-290-3881

Flight Times (h) Production (km) Unservicability (%)

Biesenthal Flown this week

Heath Flown to date

C-GJBB Project Total

Mathieson Remaining

Aircraft and Crew Summary

Goldak Airborne Surveys Operations Report

USGS - Central Oklahoma

October 02 October 08

2017
TECHNICAL REPORT ON AN AIRBORNE GEOPHYSICAL SURVEY OF CENTRAL OKLAHOMA

30 

to

Aircraft: 44671

Pilot: 12360

Copilot: 2518

Processor: 32311

Base:

Contact:

Flight 

Aircraft

Ferry

Test

Survey

Total

Flown

Accepted

Rejected

Weather

Diurnal

Equipent

Crew

Mon C-GJBB 100

September 25

Tues C-GJBB 100

September 26

Wed C-GJBB 100

September 27

Thurs C-GJBB 100

September 28

Fri 33 C-GJBB 1.9 2.7 4.6 668 668 25

September 29

Sat 34 C-GJBB 1.9 4.1 6.0 1003 1003

September 30

Sun 35 C-GJBB 1.8 4.0 5.8 847 847

October 01

5.6 0 10.8 16.4 2518 2518 0

26.8 0.6 146.1 173.5 32732 32311 421

Aircraft and Crew Summary

Goldak Airborne Surveys Operations Report

USGS - Central Oklahoma

September 25 October 01

2017

C-GJBB Project Total

Mathieson Remaining

Biesenthal Flown this week

Heath Flown to date

Altus, OK

306-290-3881

Flight Times (h) Production (km) Unservicability (%)

Notes

Rain, Lightning, Low overscast

Rain, Low overcast

Rain, Low overcast

Low overcast

Weather cleared by mid-day

Weekly Total

Total to Date
TECHNICAL REPORT ON AN AIRBORNE GEOPHYSICAL SURVEY OF CENTRAL OKLAHOMA

31 

to

Aircraft: 44671

Pilot: 7672

Copilot: 1476

Processor: 36999

Base:

Contact:

Flight 

Aircraft

Ferry

Test

Survey

Total

Flown

Accepted

Rejected

Weather

Diurnal

Equipent

Crew

Mon C-GJBB 100

October 09

Tues C-GJBB 100

October 10

Wed C-GJBB 100

October 11

Thurs C-GJBB 50 50

October 12

Fri 40 C-GJBB 1.0 5.1 6.1 1201 952 249 20

October 13

Sat 41 C-GJBB 1.3 2.7 4.0 595 524 71 40 20

October 14

Sun C-GJBB 100

October 15

2.3 0 7.8 10.1 1796 1476 320

33 0.6 168.4 202 37740 36999 741

Aircraft and Crew Summary

Goldak Airborne Surveys Operations Report

USGS - Central Oklahoma

October 09 October 15

2017

C-GJBB Project Total

Mathieson Remaining

Biesenthal Flown this week

Heath Flown to date

Chickasha, OK

306-290-3881

Flight Times (h) Production (km) Unservicability (%)

Notes

Aircraft maintenance

Aircraft maintenance

Aircraft maintenance

Aircraft maintenance complete by midday. 

High winds and turbulence.

Some diurnal activity during flight

Flight shortened, heavy winds

Weekly Total

Total to Date

High winds and turbulence
TECHNICAL REPORT ON AN AIRBORNE GEOPHYSICAL SURVEY OF CENTRAL OKLAHOMA

32 

to

Aircraft: 44671

Pilot: 3395

Copilot: 4277

Processor: 41276

Base:

Contact:

Flight 

Aircraft

Ferry

Test

Survey

Total

Flown

Accepted

Rejected

Weather

Diurnal

Equipent

Crew

Mon 42 C-GJBB 1.2 3.9 5.1 928 928

October 16

Tues 43 C-GJBB 1.1 4.1 5.2 1033 1033

October 17

Wed 44 C-GJBA 0.9 2.9 3.8 664 597 67 30

October 18

Thurs 45 C-GJBB 1.4 2.7 4.1 604 604

October 19

Fri C-GJBB 50

October 20

Sat C-GJBB 100

October 21

Sun 46 C-GJBB 0.4 5.9 6.3 1148 1115 33

October 22

5 0 19.5 24.5 4377 4277 100

38 0.6 187.9 226.5 42117 41276 841

Aircraft and Crew Summary

Goldak Airborne Surveys Operations Report

USGS - Central Oklahoma

October 16 October 22

2017

C-GJBB Project Total

Mathieson Remaining

Biesenthal Flown this week

Heath Flown to date

Chickasha, OK

306-290-3881

Flight Times (h) Production (km) Unservicability (%)

Notes

High wind and turbulence shortened flight

High winds. Unable to get into military areas; alternate flight plans 

not yet determined

High winds and turbulence

Weekly Total

Total to Date
TECHNICAL REPORT ON AN AIRBORNE GEOPHYSICAL SURVEY OF CENTRAL OKLAHOMA

33 

to

Aircraft: 44671

Pilot: -1031

Copilot: 4426

Processor: 45702

Base:

Contact:

Flight 

Aircraft

Ferry

Test

Survey

Total

Flown

Accepted

Rejected

Weather

Diurnal

Equipent

Crew

Mon 47 C-GJBB 0.4 5.6 6.0 1019 1019

October 23

Tues 48 C-GJBB 0.6 5.6 6.2 921 848 73

October 24

Wed 49 C-GJBB 0.3 4.7 5.0 808 794 14

October 25

Thurs 50 C-GJBB 0.3 5.3 5.6 905 905

October 26

Fri C-GJBB

October 27

Sat 51 C-GJBB 0.8 4.2 5.0 860 860

October 28

Sun C-GJBB

October 29

2.4 0 25.4 27.8 4513 4426 87

40.4 0.6 213.3 254.3 46630 45702 928

Aircraft and Crew Summary

Goldak Airborne Surveys Operations Report

USGS - Central Oklahoma

October 23 October 29

2017

C-GJBB Project Total

Mathieson Remaining

Biesenthal Flown this week

Heath Flown to date

Chickasha, OK

309-290-3881

Flight Times (h) Production (km) Unservicability (%)

Notes

Completes Project

Weekly Total

Total to Date