1/28/2024 0 Comments Aerial photography![]() Locate existing trails, ditches, and other linear features 3 feet or more in width, broken to open coverĭetect erosion, large gullies, etc. Identify tree species (for groups of trees) based on crown forms, texture, and color (crown diameter 20 feet or larger)ĭetermine wet areas 1/10 acre or larger in size by color, texture, species composition of surrounding vegetation Identify slope breaks for stream management zones ![]() Identify existing snags, 20 inches or more in diameter, 20 feet or more in height Identify individual trees, bushes, or other features for project boundary locations (crowns 3 feet or more in diameter, features 3 feet or more in size) Identify conifers with crown diameter 2 feet or larger, for plantation management For other uses, the following chart can be used as a very general guideline: End Use for Photography If you want to use it solely for identifying specific features on the ground, determine the diameter of the smallest feature you need to identify. If the product is for a number of different uses, 1:12,000 is an ideal scale. How do I determine the best scale for my needs? In addition, the Aerial Photography Group can help in locating historical aerial photographic images taken by the BLM or other government agencies. At the present time, Mapping Sciences contracts the scanning, rectifying, and mosaicking using assistance from an on-site contractor. ![]() Mapping Sciences has purchased a 12"x18" scanner and ER Mapper software for rectifying and digitally mosaiking. Traditional aerial photos may also be scanned, rectified, and put into a GIS. Aerial photos may be laminated, mosaicked for display, or mosaicked in black and white to be used as an index. The products we offer at this time are: 9"x 9" aerial photos in natural color or color infrared, with stereo coverage diapositives photographic enlargements oblique aerial photographs digital ArcView indexes of your aerial photo project (since 1999, some available for older projects) or hardcopy project indexes. The Mapping Sciences Section's Aerial Photography Group establishes, monitors, and manages contracts for aerial photography. National BLM > OR/WA > Maps And Data > Geoscience FAQs on Aerial Photography and Related Subjects What different services does Mapping Sciences offer?
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