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Final Review of the 2004 NAIP Digital Orthoimagery of Texas. Gordon Wells and Linda Prosperie UT Center for Space Research. November 10, 2005. NAIP DOQ. NAIP QA Assessment Procedures. Phase 1 . Comprehensive review of all MrSID County Mosaics Four Operators inspected: - PowerPoint PPT Presentation
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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
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%).