Final Review of the 2004 NAIP Digital Orthoimagery of Texas NAIP DOQ November 10, 2005 Gordon Wells and Linda Prosperie UT 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 QQs County Mosaics GeoTIFF Quarter-Quads Total NAIP QA/QC All Checkpoints

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

NAIP QA/QC All GeoTIFFs Mean Displacement Median Displacement Mosaics Mosaics + All GeoTIFFs Random GeoTIFFs Mean and Median Displacement

Mosaics Random GeoTIFFs XRMS YRMS Radial Circular RMSE Error All GeoTIFFs Mosaics + All GeoTIFFs NAIP QA/QC Accuracy Statistics

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

1:4800 1” = 400’ 1:6000 1” = 500’ 1: ” = 1000’ 1:2400 1” = 200’ 4.05 m 5.09 m m 2.04 m 4.60 m 5.79 m m 2.32 m 2.44 m 3.35 m 6.71 m 1.34 m Map Scale NMAS Circular Error NSSDA Radial Accuracy NSSDA Radial RMSE Texas NAIP 4.91 m5.62 m3.23 m Texas NAIP & Accuracy Standards

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 GeoTIFFs 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%).