Final Review of the 2004 NAIP Digital Orthoimagery of Texas
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Final Reviewof the 2004 NAIP
Digital Orthoimageryof Texas
NAIP DOQ
November 10, 2005
Gordon Wellsand
Linda ProsperieUT Center for Space Research
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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
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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
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GeoTIFF Quarter-Quad points 989GeoTIFF Quarter_Quads 989
NAIP QA/QCGeoTIFF Checkpoints
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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
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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
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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
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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
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NAIP QA/QC
Quarter-Quadswith
Clouds731 or 4.12%
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NAIP QA/QCNAIP QA/QC
Quarter-QuadsWith
>10% Clouds88 or 0.496%
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NAIP QA/QC
Quarter-QuadsWith
Other Defects
Mosaics 274GeoTIFFs 316Less Overlap 97Total 483
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NAIP QA/QCDefects other than Clouds
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NAIP Anomaly
Specular Reflection
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NAIP Anomaly
Boeing 737
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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%).