Low-elevation orthophotos used to track river changes Seattle City Light is using low-elevation orthophotography to track large woody debris movement in the South Fork Tolt River. The utility has a 15-MW project an this river, which provides important spawning area for chinook salmon and vvinter steelhead. Both fish are listed as threatened under the Endangered Spe-;ies Act. An orthophoto (or ortho-rectified photo) is an aerial photograph that is geometrically corrected for topographic relief, lens distortion, and camera tilt. The result is a photo with a uniform scale that can be used to measure true distances.
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机译：用于跟踪河流变化的低海拔正射照片Seattle City Light正在使用低海拔正射照相技术来跟踪南福克托特河中的大块木屑运动。该公司在这条河上有一个15兆瓦的项目，该项目为奇努克鲑鱼和vvinter硬头鱼提供了重要的产卵区。根据《濒危物种法》，这两种鱼均被列为受威胁物种。正射照片（或正射矫正的照片）是经过航空几何校正的航空照片，用于地形起伏，镜头变形和相机倾斜。结果是一张具有均匀比例的照片，可用于测量真实距离。
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