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- .. _community_rat:
- Raster Attribute Table support
- ==============================
- A GDAL Raster Attribute Table (RAT) is a data structure associated with a raster dataset,
- providing a way to associate attribute information for individual pixel values within the raster.
- Essentially, it acts as a tabular data structure that links each cell value in the raster to one or more attributes.
- The RAT consists of rows and columns, where each row corresponds to a unique cell value in the raster,
- and each column represents a different attribute or property of those cells.
- These attributes can be numerical, categorical, text-based
- and may include information like land cover types, elevation values, or any other relevant data, but
- may also contain color information that can be used to render the raster in a more visually appealing way.
- The RAT is stored in a separate file from the raster data itself, and is typically stored in a ".aux.xml" file,
- as part of a PAMDataset. Each of the bands in the PAM can contain a separate RAT, allowing
- for different attributes to be associated with each band.
- One example of RAT usage is the NOAA Bluetopo dataset, which contains 3 floating points bands:
- * The first band contains bathymetry data
- * The second band contains a measure of uncertainty
- * The third band, dubbed "contributor", links to a RAT that contains various information about the source of the data, such as the name of the source institution, the source license, date of survey, and more.
- In this section:
- .. toctree::
- :maxdepth: 1
- installing
- using
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