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27	27	|The [[**shapefile**>>https://en.wikipedia.org/wiki/Shapefile]] format is a popular geospatial vector data format for geographic information system software. It is developed and regulated by Esri as a (mostly) open specification for data interoperability among Esri and other GIS software products. The shapefile format can spatially describe vector features: points, lines, and polygons, representing, for example, water wells, rivers, and lakes. Each item usually has attributes that describe it, such as name or temperature.
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29		-In remote sensing, [[**spatial resolution**>>https://en.wikipedia.org/wiki/Image_resolution]] or [[ground sampling distance >>https://en.wikipedia.org/wiki/Ground_sample_distance]]is typically limited by diffraction, as well as by aberrations, imperfect focus, and atmospheric distortion. The ground sample distance (GSD) of an image, the pixel spacing on the Earth's surface, is typically considerably smaller than the resolvable spot size.
	29	+In remote sensing, [[**spatial resolution**>>https://en.wikipedia.org/wiki/Image_resolution]] is typically limited by diffraction, as well as by aberrations, imperfect focus, and atmospheric distortion. The ground sample distance (GSD) of an image, the pixel spacing on the Earth's surface, is typically considerably smaller than the resolvable spot size.
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