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Final Review of the 2004 NAIP Digital Orthoimagery of Texas

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:

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Final Review of the 2004 NAIP Digital Orthoimagery of Texas

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  1. 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

  2. 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

  3. NAIP QA/QC All Checkpoints Points QQs Percent of 17725 QQs County Mosaics 6026 5351 30.2 GeoTIFF Quarter-Quads 989 989 5.6 Total 7015 6340 35.8

  4. NAIP QA/QC GeoTIFF Checkpoints GeoTIFF Quarter-Quad points 989 GeoTIFF Quarter_Quads 989

  5. Mean and Median Displacement NAIP QA/QC Mean Displacement Median Displacement Mosaics 2.6423 2.4270 Random GeoTIFFs 2.6604 2.6653 All GeoTIFFs 3.1633 2.5384 Mosaics + All GeoTIFFs 3.1219 2.4483

  6. Accuracy Statistics NAIP QA/QC Radial Circular RMSE Error XRMS YRMS Mosaics 2.074 2.261 3.068 4.656 Random GeoTIFFs 1.942 2.458 3.133 4.754 All GeoTIFFs 2.709 3.068 4.093 6.211 Mosaics + All GeoTIFFs 2.175 2.392 3.233 4.906

  7. National Accuracy Standards NMAS Circular Error NSSDA Radial Accuracy NSSDA Radial RMSE Map Scale 1:2400 1” = 200’ 2.04 m 2.32 m 1.34 m 1:4800 1” = 400’ 4.05 m 4.60 m 2.44 m 1:6000 1” = 500’ 5.09 m 5.79 m 3.35 m 1:12000 1” = 1000’ 10.15 m 11.58 m 6.71 m

  8. Texas NAIP & Accuracy Standards NMAS Circular Error NSSDA Radial Accuracy NSSDA Radial RMSE Map Scale 1:2400 1” = 200’ 2.04 m 2.32 m 1.34 m 1:4800 1” = 400’ 4.05 m 4.60 m 2.44 m Texas NAIP 4.91 m 5.62 m 3.23 m 1:6000 1” = 500’ 5.09 m 5.79 m 3.35 m 1:12000 1” = 1000’ 10.15 m 11.58 m 6.71 m

  9. NAIP QA/QC Quarter-Quads with Clouds 731 or 4.12%

  10. NAIP QA/QC NAIP QA/QC Quarter-Quads With >10% Clouds 88 or 0.496%

  11. NAIP QA/QC Quarter-Quads With Other Defects Mosaics 274 GeoTIFFs 316 Less Overlap 97 Total 483

  12. NAIP QA/QC Defects other than Clouds

  13. NAIP Anomaly Specular Reflection

  14. NAIP Anomaly Boeing 737

  15. 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%).

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