Quality and Accuracy Report

for

National Park Service Alaska Support Office

##### In Partnership with

##### Earth Satellite Corporation

### Contract No.: 1443CX991097004

Task Order No.: 1443TO991098011

#### Title: State Surficial Geology Map of Alaska

##### Date: February 14, 1999

National Park Service Alaska Support Office

Quality and Accuracy Report

Data Layer Name: Qcode

Data Layer Description: Statewide Alaska Geology

Firm: Greenhorne & O\'Mara, Inc.

9800 4th Street, North Suite 202

St. Petersburg, FL 33702

(727)576-0402

(727)576-0305 (fax)

Project Manager: Kathleen O\'Keife

Prepared By: Kimberly A. Ermann

Date: January 14, 1999

A. DATA

1\. Description of Source Material Provided by National Park Service

a\. US Geological Survey Maps

Name: Miscellaneous Geologic Investigations (West) I-357

Scale (ratio): 1:1,584,000

Datum: Mean Sea Level

Map Projection: Unknown

Condition of Media: Good

Creator Organization: USGS

Date of Source Material: 1955

Name: Miscellaneous Geological Investigations (East) I-357

Scale (ratio): 1:1,584,000

Datum: Mean Sea Level

Map Projection: Unknown

Condition of Media: Good

Creator Organization: USGS

Date of Source Material: 1960

b.  Coverages:

-   Alaska_c

-   Alaska_cl

-   Alaska_cb

-   Glaciers

-   Lakes

-   Majriv

2\. Deliverable Format

Map Projection: Albers

Zunits: No

Units: Meters

Spheroid: Clarke 1866

Xshift: 0.000

Yshift: 0.000

Parameters: 55 0 0.000/\* 1st standard parallel

65 0 0.000/\* 2^nd^ standard parallel

-154 0 0.000/\* central meridian

50 0 0.000/\*latitude of projection's origin

0.00000/\* false easting (meters)

3\. Derivation of Data / Method of Derivation

The Geologic map extents were collected through a series of procedures.

-   Mylar sheets were overlain on the hard-copy geologic survey maps.

-   Corner tics were etched on the mylar overlays with a rapidiograph
    pen.

-   Utilizing a light table, the Qcode extents, indicated by the colored
    polygons on the hard-copy maps, were traced onto the mylar overlays
    with rapidiograph pens.

-   Intersecting latitude/longitude tics were indicated and labeled for
    reference.

-   The resultant inked mylar overlays were scanned and output into TIF
    format

-   Utilizing the SRV software package, the linework was autovectorized.

-   After vectorization, the linework was imported and the file was
    attributed.

-   The coverages provided by NPS contained tics that represented real
    world coordinate values. The new coverages were transformed into the
    provided coverages.

-   The project specification dictated that the NPS provided coverages
    supercede the older data set in cases of conflict (e.g., differing
    coastline features.)

-   \"Qcode\" attributes were assigned; utilizing the ARC/INFO software
    package

-   QC Plots were created for each individual map.

-   Visual quality assurance was conducted by overlaying each plot on
    the corresponding geologic maps.

-   The separate coverages were edgematched and dissolved into one
    coverage.

-   NPS received interim checkplots and digital data for internal QC.

-   Final edit were performed at contractor facility.

-   Final digital quality assurance was conducted., Report was finalized
    and product was produced on CDRom for final delivery to NPS.

4\. Equipment

-   Sun Ultra 170 Workstations

-   GTCO Digitizing Tablets

-   HP750c Plotter

5\. Data Automation

-   Data was compiled from October 8, 1998 to January 14, 1999.

6\. Software System and Version Used

-   ESRI\'s ARC/INFO version 7.04 and 7.1.2

  ------------------- ------------------------ --------------------------
  **Q code**          **Deposit Type**         **Deposit Name**

  Qi                  Glacier                  Ice

  Qm4                 Current moraine          Glacial moraines & drift

  Qm3                 Lightly modified moraine Glacial moraines & drift

  Qm2                 Moderately modified      Glacial moraines & drift
                      moraine                  

  Qm1                 Highly modified moraine  Glacial moraines & drift

  Qg                  Proglacial lake          Glacio-lacustrine

  Qgm/Qm3 **Note:     Proglacial lake over     Glacio-lacustrine
  call all these Qgm. moraine                  
  Disregard date                               
  denominator.**                               

  Qw2                 Current glacial outwash  Glacio-fluvial

  Qw1                 Old glacial outwash      Glacio-fluvial

  Qfp                 Floodplain               Fluvial

  Qat                 Alluvial Terrace         Fluvial

  Qaf                 Alluvial Fan             Fluvial

  Qed                 Sand Dune                Eolian

  Qed                 Upland Loess             Eolian

  Qes                 Valley Loess & alluvium  Eolian

  Qcb                 Beach                    Coastal

  Qcd                 Coastal Delta            Coastal

  Qcc                 Old marine 7 alluvium    Coastal

  Qu                  Undifferentiated mosaic  Undifferentiated alluvium
                                               & colluvium

  Qra                 Bedrock & coarse rubble  Mountain alluvium &
                                               colluvium

  Qrb                 Coarse & fine rubble     Mountain alluvium &
                                               colluvium

  Qrc                 Fine rubble              Mountain alluvium &
                                               colluvium

  Qrd                 Volcanic                 Mountain alluvium &
                                               colluvium

  Qre                 Alluvium over old        Mountain alluvium &
                      alluvium                 colluvium

  Ql                  Lake                     Water
  ------------------- ------------------------ --------------------------

B.  EXPLANATION

Glacial Moraines and Associated Drift

1.  Q~i~ -- Existing glaciers

2.  Qm~4~ -- Moraines and associated drift near existing glacier fronts

3.  Qm~3~- Prominent little modified moraines and associated drift lying

> above or beyond boundaries of Qm4

4.  Qm~2~ -- Modified moraines and associated drift lying above of
    beyond boundaries of Qm3.

5.  Qm~1~ -- Remnants of highly modified moraines and associated drift
    lying above or

> beyond boundaries of Qm2

Glacio-lacustrine Deposits

1.  Qg -- Proglacial lake deposits

2.  Qgm -- Proglacial lake deposits, discontinuously mantling glacial
    and

> glacio-fluvial deposits but not completely obscuring glacial
> topography: age indicated by symbols

#  Glacio-fluvial Deposits

1.  Qw~2~ -- Outwash and valley train deposits graded to glacier fronts
    and recent moraines

2.  Qw~1~ -- Outwash deposits bordering older moraines: fluvial deposits
    further downvalley

> may be dissected distal parts of outwash aprons or valley trains and
> are included in Qat and Qaf

#  Fluvial Deposits

1.  Qfp -- Modern flood-plain and associated low-terrace and alluvial
    fan deposits

2.  Qat -- Higher terrace deposits on valley margins and discontinuous
    terrace deposits in

> valleys where flood plains are too small to map

3.  Qaf -- Alluvial-fan deposits

## Eolian Deposits

1.  Qed -- Sand dunes: dotted pattern indicates areas of active dunes

2.  Qe -- Silt more than 5 feet thick, covering upland interfluve areas,
    predominantly eolian

3.  Qes -- Thick valley bottom silt and sand, predominantly eolian but
    including much colluvium

> and stratified water-laid deposits

## Coastal Deposits

1.  Qcb -- Modern coastal beaches, spits, and bars

2.  Qcd -- Coastal delta deposits

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3.  Qcc- Older coastal deposits of inter-stratified alluvial and marine
    sediments, including,

locally, glacial drift

Undifferentiated Upland Valley and Lowland Alluvium

1.  Qu - Alluvium in larger upland valleys and in lowlands of central
    Alaska including

> undifferentiated eolian, colluvial, fluvial, marine, and glacial
> deposits

## Undifferentiated Alluvium and Slope Deposits in Mountainous and Hilly Regions

1.  Qra -- dominantly coarse rubbly deposits associated with
    steep-sloped mountains

with high percentage of bedrock exposures

2.  Qrb- Course- and fine-grained deposits associated with moderate to
    sleep-sloped

> mountains and hills with bedrock exposures largely restricted to upper
> slopes and crestlines

3.  Qrc - Dominantly fine-grained deposits associated with gently
    sloping hills with rare bedrock

> exposures

4.  Qrd -- deposits with high percentages of volcanic rock particles,
    ash, and pumice flanking volcanic cones and peaks of Quarternary and
    Tertiary age

5.  Qre -- Discontinuous alluvial deposits overlying dissected
    unconsolidated, semi-consolidated,

> and locally consolidated silt, sand, and gravel of Tertiary and
> younger age

C. LINEWORK ACCURACY

1\. Linework Completeness and Positional Accuracy

a\. Value

100% of all linework was captured.

b\. Date

Final Quality Control checks were made in February 1999.

c\. Methods Used to Derived Value

Overlay of Quality Control Plots with Geologic maps.

D. ATTRIBUTE ACCURACY

1\. Attribute Completeness Check

a\. Value

100% of all attributes on the source material were captured.

b\. Data

Final Quality Control Checks were made in February 1999.

c\. Method Used to Derive Value

Visual comparisons occurred between the geologic maps.

and the Attributed Quality Control Plots.

E. LOGICAL CONSISTENCY

1\. Topologic Tests

a\. Tests Performed

Cartographic Tests included the following ARC/INFO commands:

BUILD, CLEAN, DESCRIBE, LABEL ERRORS, NODE ERRORS.

b\. Date

Tests were performed in December 1998 and on final product in February
1999.

c\. Are all polygons closed?

Yes.

d\. Have dangles been eliminated?

Yes

e\. Have slivers been eliminated?

Yes.

f\. Do features (lines, polygons) have unique identifiers?

Yes.