You can move the geodatabase anywhere and all of the data inside it moves too-the geodatabase acts as a portable storage container. You'll probably find it preferable to use raster datasets (as opposed to raster catalogs) when you want to:Īlthough a raster dataset can be stored anywhere, you will find that storing your raster datasets in a geodatabase facilitates data management. When a raster dataset is created from more than one raster, the overlapping areas of the input rasters are merged. In this raster dataset a single, seamless raster was created from two contiguous rasters with the same properties that were mosaicked together. You created a raster dataset in the previous exercise when you mosaiced the DRG into one single file before clipping. Regardless of how many rasters were used to create it, a raster dataset is a single raster and has only one metadata file. The raster datasets you've worked with so far in this course have been in a variety of formats, including ESRI Grid, ERDAS IMAGINE, and JPEG.Sometimes a raster dataset is created from multiple rasters. The term raster dataset refers to any ArcGIS-supported raster format. Raster DatasetsĪ raster dataset is simply a single raster, like land cover for your study area. Some of the most common formats you'll see are the ESRI Grid and various image formats such as the graphics interchange format (GIF), ERDAS IMAGINE (IMG), tag image file format (TIFF) and Joint Photographic Experts Group (JPEG). Many raster formats have been developed over the years to support specialized uses some offer high data compression, some handle color better than others, and some are designed specifically to store geographic data. The format of a raster determines how the cells are stored inside it.
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