Aerial Mapping Services

2026-11-03

Task 1 : Aerial Mapping 1 . Aerial photography : New color aerial photographs of project site will be taken using manned aircraft or current acceptable methods such as drone at an appropriate photo scale using high resolution , high precision , photogrammetric aerial camera . Aerial photography shall be obtained only during periods when the sun angle exceeds 30 percent ; the project site is free of snow , clouds , or cloud shadows ( clouds obscure no more than 5 percent of any frame ); and the project site is free of haze . The mapping shall meet National Map Accuracy Standards and shall be performed or verified by a Licensed Surveyor with relevant experience . A calibration report will be provided for the camera used . The report will be prepared by United States Geological Survey ( USGS ) or the camera manufacturer within the last three ( 3 ) years . Lidar technology is NOT to be used . 2 . The nominal photography scale to be used for mapping will not exceed 1 " = 320 ’. Any deviations in photo scale from this specification must be approved , in advance , by County . 3 . Flight tolerances will be as follows : a . Coverage - The mapping limits and control for the flight will fall within the central seven ( 7 ) inches of the photography . b . Forward Overlap - Forward overlap will not exceed sixty - five percent ( 65 %) or be less than fifty - five percent ( 55 %) and will average sixty percent ( 60 %).

California

2026-03-27