Grand Canyon Monitoring and Re

2002 Orthophoto

and L

Collection
2002 – Proposed Collection

Methods•Aerial LIDAR collection •Digital orthorectified imagery (CIR or Multispec•LIDAR used to orthorectify the scanned images•No ground control needed for orthorectification Products•Continuous imagery and topography from Lake •Imagery (18-24 cm pixel resolution/half to 2 m a•ONE meter LIDAR post spacing (15 cm position•500 Meter swath (expanded in areas where need

“Old High Water Zone”)
The collected data will be used 

•Monitoring terrestrial, fine-grained sediment m

storage (e.g., sand bars and river terrace

•Monitoring terrestrial, coarse-grained, sedime

(e.g., cobble bars and debris fans)

•Mapping terrestrial vegetation types througho•Characterizing and monitoring terrestrial vege

for birds and insects

•Monitoring the quality of camping beaches
In addition, the data sets will be ev

•Monitoring aquatic flux and storage of sedimen

main channel

•Mapping/monitoring aquatic food base and sele

quality parameters

•Monitoring the effects of runoff and dam releas

archaeological structures
Project Data set required E

p

Monitoring terrestrial, fine-grained sediment movement and storage

LIDAR and black and white or color infrared orthophotography

B

Monitoring terrestrial, coarse-grained, sediment changes

Black and white or color infrared orthophotography

A

Mapping terrestrial vegetation types throughout the corridor

Color infrared orthophotography

E

Characterizing and monitoring terrestrial vegetation habitats for birds and insects

Color infrared orthophotography

E
Monitoring the quality of 

camping beaches

Black and white or color infrared orthophotography

A

Potentially monitoring aquatic flux and storage of sediment within the main channel

Black and white or color infrared orthophotography

B

Mapping/monitoring aquatic food base and selected water quality parameters

Color infrared orthophotography

A

Potentially monitoring the effects of runoff and dam releases on archaeological structures

Black and white or color infrared stereo photography

A

Project Data set required E

p
Data Collection Boundary
Proposed Steady Flows from 

The BOR, WAPA, and the GCMRC have agreed upon t

scenario during the data collection:

1. Six days of steady 8,000 CFS flow beginning at midn

Friday, May 24th.

2. If additional time is needed, the 6 initial days will be f

immediately by 4 additional days of steady 8,000 CFflows from May 31st

–

June 3rd.

3. Representatives of the GCMRC, WAPA, BOR, and th

contractor will conference every day after Tuesday, 

the progress of the overflight and whether or not adddays of steady flows will be needed.

NOTE: Additional time is needed for shadow abatement 

weather and/or mechanic difficulties.
Shadowing in the river corridor has been a major 

airborne data collection in the past.

To minimize shadowing (and increase the value o

collections) the following has been implement

1. Switch flight from Labor Day to Memorial day 

higher sun angle (closer the solstice).

2. Limiting data collections to times when the su

degrees or greater.

3. Shadowing Analysis to identify problematic ar4. Ensure remote sensing contractors fly at pre-d

minimize shadowing in problematic areas.

SHADOWING ABATE
Shadowing Prediction Analy

Shadowing Analysis was preformed to determine 

(shown by boxes on map).
Special limits are placed upon contractors within 
B

A

After ShadowAbatement