Читать книгу Imagery and GIS - Kass Green - Страница 71

We cannot emphasize enough how your choice of imagery will be dependent upon the requirements of your projects and not on the newest technology available. Different applications and organizations will have different requirements. A project to map impervious surfaces will have requirements different from one for property assessments, environmental monitoring, parcel mapping, weather prediction, road design, pipeline monitoring, forest inventory, change detection, soils, or geology. The imagery needs of a federal agency will likely be very different from those of a local or state agency, nongovernment organization (NGO), or private landowner. However, often one dataset can meet multiple organizations’ needs. Such is the case with the lidar and optical imagery acquired for Sonoma County, California, which is continually used by multiple organizations including NASA and USGS researchers, the Sonoma County Open Space and Agricultural Preservation District, Sonoma County Permit and Resource Management Department, Sonoma Ecology Center, Sonoma County Water Agency, San Francisco Estuary Institute, and many private companies (Green, 2017). It is essential that you carefully evaluate your and your partner organization’s proposed imagery uses before you purchase or acquire imagery. Considering the questions posed in this chapter forces imagery users to fully analyze and understand the benefits and costs of their imagery requirements, allowing them to make fully informed trade-offs when necessary.