![]() ![]() There are three types of geodatabases: file, personal, and ArcSDE. The file geodatabase is a collection of geographic datasets of various types, with the most basic types being vector, raster, and tabular data. SDC is ESRI's highly compressed format, which is directly readable by ArcGIS software. All these files must be saved in the same workspace. To have a complete shapefile, you must have at least 3 files with the same prefix name and with the following extensions. The ESRI Shapefile has become an industry standard geospatial data format, and is compatible to some extent with practically all recently released GIS software. Raster data also includes remote sensing imagery, like aerial photography and satellite imagery. These phenomena are measured at intervals (think weather stations), and values in between are interpolated to create a continuous surface. Think of raster data as appropriate for modeling surfaces like elevation, temperature, precipitation, or soil Ph. As rasters, the data are viewed as a series of grid cells where each cell has a value representing the feature being observed. Examples are county boundaries, the location of roads and railroads using lines, or point data indicating the location of fire hydrants.īy contrast, raster data is best suited for continuous data, or information that does not have hard boundaries or locations. ![]() Data that has an exact location, or hard boundaries are typically shown as vector data. ![]() Discrete (or thematic) data is best represented as vector. Vector data is represented as either points, lines, or polygons. The two primary data types are raster and vector. Geospatial data is created, shared, and stored in many different formats. ![]()
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