Aerial_Photography/OldRiver_20210114

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Service Description: Survey Date and Time: Data was collected on 1/14/2021 1200-1245 PST Imagery Acquisition: The imagery was collected using a DJI Mavic 2 Pro UAS, operating at 250’ above ground level, along one single flight line following the center line of Old River from 1.5 miles downstream of Tracy road to River’s End. The field collection was controlled by a DJI Smart Controller running the DJI Pilot app. Software Processing: Images were imported into ArcGIS Pro 2.7 using the Ortho Mapping workspace tool, block adjusted, and an Orthomosaic was generated. No external control points were used for this project. Adjustment summary from ArcGIS Pro: Number of Adjusted Images 1649 Number of Tie Points 4916185 Number of Solution Points 1743941 Mean Reprojection Error / Sigma Naught (pixel) 0.29 / 0.43 Ground Resolution (m/pixel) 0.017 Adjustment Type Frame Ground Control Points Involved in Adjustment No DWR makes no warranties or guarantees —either expressed or implied— as to the completeness, accuracy, or correctness of the data. DWR neither accepts nor assumes liability arising from or for any incorrect, incomplete, or misleading subject data. This Image Service was published on 1/21/2021, by Joel Dudas of the DWR Division of Engineering, who may be contacted at 916-651-7002, or at joel.dudas@water.ca.gov. Comments, problems, improvements, updates, or suggestions should be forwarded to the official DWR point of contact as available and appropriate.

Name: Aerial_Photography/OldRiver_20210114_2

Description: Survey Date and Time: Data was collected on 1/14/2021 1200-1245 PST Imagery Acquisition: The imagery was collected using a DJI Mavic 2 Pro UAS, operating at 250’ above ground level, along one single flight line following the center line of Old River from 1.5 miles downstream of Tracy road to River’s End. The field collection was controlled by a DJI Smart Controller running the DJI Pilot app. Software Processing: Images were imported into ArcGIS Pro 2.7 using the Ortho Mapping workspace tool, block adjusted, and an Orthomosaic was generated. No external control points were used for this project. Adjustment summary from ArcGIS Pro: Number of Adjusted Images 1649 Number of Tie Points 4916185 Number of Solution Points 1743941 Mean Reprojection Error / Sigma Naught (pixel) 0.29 / 0.43 Ground Resolution (m/pixel) 0.017 Adjustment Type Frame Ground Control Points Involved in Adjustment No DWR makes no warranties or guarantees —either expressed or implied— as to the completeness, accuracy, or correctness of the data. DWR neither accepts nor assumes liability arising from or for any incorrect, incomplete, or misleading subject data. This Image Service was published on 1/21/2021, by Joel Dudas of the DWR Division of Engineering, who may be contacted at 916-651-7002, or at joel.dudas@water.ca.gov. Comments, problems, improvements, updates, or suggestions should be forwarded to the official DWR point of contact as available and appropriate.

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Pixel Type: U8

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Mensuration Capabilities: Basic

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Copyright Text: Michael Baldwin, P.E., California Department of Water Resources, NCRO

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Standard Deviation Values: 42.31446320928979, 36.91759906980046, 33.258916118330596

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Supported Operations: Export Image Identify Measure Compute Histograms Compute Statistics Histograms Get Samples Compute Class Statistics Query Boundary Compute Pixel Location Compute Angles Validate Project

Aerial_Photography/OldRiver_20210114_2 (ImageServer)