Changes between Version 50 and Version 51 of WKTRaster/Documentation01


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Timestamp:
Dec 10, 2009, 10:57:23 AM (14 years ago)
Author:
pracine
Comment:

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  • WKTRaster/Documentation01

    v50 v51  
    299299This regular tiling (or regular blocking) is expected from arrangements c) d) and e) in figure 1. PostGIS WKT Raster provides this mechanism because raster applications are often optimized to deal with these arrangements. There is, however, no mechanism to enforce (constrain) these criteria and, as mentioned above, adding, modifying or deleting a row from the table might break this regular blocking, and the regular_blocking attribute will not be automatically updated.
    300300
    301 Structure of the "raster" Type
     301'''Structure of the "raster" Type'''
    302302
    303303Like the geometry type, the raster type is a complex PostgreSQL type composed of many attributes accessible using various functions. A raster attribute may be composed of many bands sharing a common size, pixel size and georeference. Each band has a pixel type and may have a nodata value.