final review of the 2004 naip digital orthoimagery of texas

Final Reviewof the 2004 NAIP

Digital Orthoimageryof Texas

NAIP DOQ

November 10, 2005

Gordon Wellsand

Linda ProsperieUT Center for Space Research

NAIP QA Assessment Procedures

Phase 1. Comprehensive review of all MrSID County Mosaics

Four Operators inspected:

1 geometry checkpoint per 7.5-minute quad (64 square miles)

Noted all radiometric errors and cloud cover

Phase 2. Selective review of quarter-quad GeoTIFFs

Four Operators inspected:

All geometric errors >7 m detected during Phase 1

A random selection of additional quarter-quad GeoTIFFs

Noted all radiometric errors and cloud cover

Points QQs Percent of 17725 QQsCounty Mosaics 6026 5351 30.2GeoTIFF Quarter-Quads 989 989 5.6Total 7015 6340 35.8

NAIP QA/QCAll Checkpoints

GeoTIFF Quarter-Quad points 989GeoTIFF Quarter_Quads 989

NAIP QA/QCGeoTIFF Checkpoints

NAIP QA/QC

All GeoTIFFs 3.1633 2.5384

Mean Displacement Median Displacement

Mosaics 2.6423 2.4270

Mosaics + All GeoTIFFs 3.1219 2.4483

Random GeoTIFFs 2.6604 2.6653

Mean and Median Displacement

Mosaics 2.074 2.261 3.068 4.656

1.942 2.458 3.133 4.754Random GeoTIFFs

XRMS YRMS Radial Circular RMSE Error

All GeoTIFFs 2.709 3.068 4.093 6.211

Mosaics + All GeoTIFFs 2.175 2.392 3.233 4.906

NAIP QA/QC

Accuracy Statistics

1:48001” = 400’

1:60001” = 500’

1:120001” = 1000’

1:24001” = 200’

4.05 m

5.09 m

10.15 m

2.04 m

4.60 m

5.79 m

11.58 m

2.32 m

2.44 m

3.35 m

6.71 m

1.34 m

Map ScaleNMAS

Circular ErrorNSSDA

Radial AccuracyNSSDA

Radial RMSE

National Accuracy Standards

1:48001” = 400’

1:60001” = 500’

1:120001” = 1000’

1:24001” = 200’

4.05 m

5.09 m

10.15 m

2.04 m

4.60 m

5.79 m

11.58 m

2.32 m

2.44 m

3.35 m

6.71 m

1.34 m

Map ScaleNMAS

Circular ErrorNSSDA

Radial AccuracyNSSDA

Radial RMSE

TexasNAIP 4.91 m 5.62 m 3.23 m

Texas NAIP & Accuracy Standards

NAIP QA/QC

Quarter-Quadswith

Clouds731 or 4.12%

NAIP QA/QCNAIP QA/QC

Quarter-QuadsWith

>10% Clouds88 or 0.496%

NAIP QA/QC

Quarter-QuadsWith

Other Defects

Mosaics 274GeoTIFFs 316Less Overlap 97Total 483

NAIP QA/QCDefects other than Clouds

NAIP Anomaly

Specular Reflection

NAIP Anomaly

Boeing 737

Summary

Geometric Accuracy is high.

14 of 7015 points checked (0.2%) failed.

Extrapolates to <40 quarter-quads in the state.

Cloud Cover is a factor.

Impacts 731 quarter-quads (4.12%).

By specification, causes rejection of 88 quarter quads (0.5%).

Radiometric Flaws need to be addressed.

Impacts 483 quarter-quads (2.72%).Severe instances would likely cause rejection of approximately

100 quarter-quads (0.6%).