{ "currentVersion": 11.3, "serviceDescription": "Purpose:\nPrimary purpose is to quantify floating and submerged aquatic vegetation in the channel.\n\nSurvey Date and Time:\n\tData was collected on 4/21/2021 1030-1130 PST\n\nImagery Acquisition:\n\tThe imagery was collected using a DJI Mavic 2 Pro UAS, operating at 200\u2019 above ground level, along one single flight line following the center line of Old River from Doughty Cut to 1.5 miles downstream of Tracy Road. The field collection was controlled by a DJI Smart Controller running the DJI Pilot app.\n\nSoftware Processing:\n\tImages were imported into ArcGIS Pro 2.7.3 using the Ortho Mapping workspace tool, block adjusted, and an Orthomosaic was generated. No external control points were used for this project.\n\nAdjustment summary from ArcGIS Pro:\nNumber of Adjusted Images\t1261\nNumber of Tie Points\t2612893\nNumber of Solution Points\t1021352\nMean Reprojection Error / Sigma Naught (pixel)\t0.35 / 0.55\nGround Resolution (m/pixel)\t0.014\nAdjustment Type\tFrame\nGround Control Points Involved in Adjustment\tNo\n\nThis is an official DWR Image Service, which meets all appropriate requirements of the DWR Spatial Data Standards, specifically the DWR Spatial Data Standard version 3.1, dated September 11, 2019. DWR makes no warranties or guarantees \u2014 either expressed or implied \u2014 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 4/28/2021, 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_20210421_1", "description": "Purpose:\nPrimary purpose is to quantify floating and submerged aquatic vegetation in the channel.\n\nSurvey Date and Time:\n\tData was collected on 4/21/2021 1030-1130 PST\n\nImagery Acquisition:\n\tThe imagery was collected using a DJI Mavic 2 Pro UAS, operating at 200\u2019 above ground level, along one single flight line following the center line of Old River from Doughty Cut to 1.5 miles downstream of Tracy Road. The field collection was controlled by a DJI Smart Controller running the DJI Pilot app.\n\nSoftware Processing:\n\tImages were imported into ArcGIS Pro 2.7.3 using the Ortho Mapping workspace tool, block adjusted, and an Orthomosaic was generated. 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