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Aerial Photography and Digital Orthoimagery


Location
Illinois
Publication Date
03/17/2020 07:54 AM EDT
Closing Date
04/21/2020 11:00 AM EDT
Issuing Organization
County of Edgar
Solicitation Number
Description

Specifications include, but are not limited to: Project Extent: The County requires color digital orthoimagery to cover the county. Digital orthoimagery will be used to derive and compile highly accurate spatial data for GIS implementation. One final orthophoto scale should be used in the project. For the Urban areas, a final minimum scale of one inch equals one hundred feet (1'' = 100') should be established. The resolution of the photos should be a minimum 6” pixels resolution. Please include prices for better resolution photography. Aerial photography will be conducted in the spring of 2021 before leaves appear on trees. Ground Control Plan: Information regarding ground control must be provided, and the county will require proof that the State Regulations of Accuracy of this project are being met. Photo Identifiable Points are acceptable. Photography: Aerial Photography (i.e., aircraft photograph, not satellite imagery) shall be undertaken only when well-defined images can be obtained. Aircraft will be flown at such an altitude that accuracy, scale, content, and resolution described herein are met. Photography shall not contain shadows caused by topographic relief and sun angle whenever such shadows can be avoided during the time of day that photography must be taken. Photography shall not be undertaken when the sun angle is less than 30 degrees above the horizon. The contractor must complete all aerial photography during periods when deciduous trees do not contain leaves; streams, rivers and ditches are within their natural boundaries; and there is no appreciable snow or ice on the ground. Photography shall not be attempted when haze, smoke, or dust obscure the ground, or when clouds or cloud shadows appear on more than five (5) percent of the area of any single photograph.

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