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A digital orthophoto is a georeferenced image prepared from aerial imagery, or other remotely-sensed data in which the displacement within the image due to sensor orientation and terrain relief has been removed. Orthophotos combine the characteristics of an image with the geometric qualities of a map. Orthoimages show ground features such as roads, buildings, and streams in their proper positions, without the distortion characteristic of unrectified aerial imagery. Digital orthoimages produced and used within the Forest Service are developed from imagery acquired through various national and regional image acquisition programs. The resulting orthoimages, also known as orthomaps, can be directly applied in remote sensing, GIS and mapping applications. They serve a variety of purposes, from interim maps to references for earth science investigations and analysis. Because of the orthographic property, an orthoimage can be used like a map for measurement of distances, angles, and areas with scale being constant everywhere. Also, they can be used as map layers in GIS or other computer-based manipulation, overlaying, and analysis. An orthoimage differs from a map in a manner of depiction of detail; on a map only selected detail is shown by conventional symbols, whereas on an orthoimage all details appear just as in original aerial or satellite imagery.This record was taken from the USDA Enterprise Data Inventory that feeds into the https://data.gov catalog. Data for this record includes the following resources: ISO-19139 metadata ArcGIS Hub Dataset ArcGIS GeoServiceFor complete information, please visit https://data.gov.

数字正射影像是一种通过航空影像或其他遥感数据制作的地籍图像，其中已消除了由于传感器方向和地形起伏引起的图像内部位移。正射影像融合了图像的特性与地图的几何特性。正射影像能够展示地面特征，如道路、建筑和溪流，并保持其正确位置，避免了未校正航空影像特有的畸变。在林业服务局内部生产和使用的数字正射影像，源自于各种国家和区域影像采集计划获取的影像。由此产生的正射影像，亦称正射地图，可直接应用于遥感、地理信息系统（GIS）和制图应用中。它们服务于多种目的，从临时地图到地球科学研究和分析的参考资料。由于正射性质，正射影像可以像地图一样用于测量距离、角度和面积，其比例尺在各地保持一致。此外，它们还可以作为GIS或其他计算机辅助的图层使用，进行叠加、操作和分析。正射影像在细节描绘方面与地图有所不同；在地图上，仅通过传统符号展示所选细节，而在正射影像上，所有细节均与原始航空或卫星影像中的细节一致。本记录摘自美国农业部企业数据清单，该清单输入至 https://data.gov 目录。本记录的数据包括以下资源：ISO-19139元数据、ArcGIS Hub数据集、ArcGIS地理服务。欲获取完整信息，请访问 https://data.gov。