Final Review of the 2004 NAIP Digital Orthoimagery

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 Mr. SID 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 Geo. TIFFs Four Operators inspected: All geometric errors >7 m detected during Phase 1 A random selection of additional quarter-quad Geo. TIFFs Noted all radiometric errors and cloud cover

NAIP QA/QC All Checkpoints Points QQs County Mosaics 6026 5351 Geo. TIFF Quarter-Quads 989 Total 7015 6340 Percent of 17725 QQs 30. 2 5. 6 35. 8

NAIP QA/QC Geo. TIFF Checkpoints Geo. TIFF Quarter-Quad points Geo. TIFF Quarter_Quads 989

Mean and Median Displacement NAIP QA/QC Mean Displacement Median Displacement Mosaics 2. 6423 2. 4270 Random Geo. TIFFs 2. 6604 2. 6653 All Geo. TIFFs 3. 1633 2. 5384 Mosaics + All Geo. TIFFs 3. 1219 2. 4483

Accuracy Statistics NAIP QA/QC XRMS YRMS Radial RMSE Circular Error Mosaics 2. 074 2. 261 3. 068 4. 656 Random Geo. TIFFs 1. 942 2. 458 3. 133 4. 754 All Geo. TIFFs 2. 709 3. 068 4. 093 6. 211 Mosaics + All Geo. TIFFs 2. 175 2. 392 3. 233 4. 906

National Accuracy Standards NMAS NSSDA Map Scale Circular Error Radial Accuracy Radial RMSE 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

Texas NAIP & Accuracy Standards NMAS NSSDA Map Scale Circular Error Radial Accuracy Radial RMSE 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

NAIP QA/QC Quarter-Quads with Clouds 731 or 4. 12%

NAIP QA/QC Quarter-Quads With >10% Clouds 88 or 0. 496%

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

NAIP QA/QC Defects 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%).