Changes between Version 178 and Version 179 of WKTRaster/SpecificationWorking03


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Timestamp:
Nov 29, 2011, 11:27:48 AM (12 years ago)
Author:
pracine
Comment:

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  • WKTRaster/SpecificationWorking03

    v178 v179  
    524524 END IF
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     526----
     527== '''Objective FV.22 - Making raster_columns and raster_overview as views''' ==
     528
     529 Following the conversion of geometry_columns to a view in PostGIS, it is planned to do the same with raster_column and raster_overview for the raster part. Converting to a view has a number of advantages:
     530
     531PostGIS is using the typmod feature of PostgreSQL to 'store' metadata about a table and then display them in the geometry_column view. Unfortunately the typmod is limited to XXX byte and there is too much information to 'store' about a raster table to use typmod. PostGIS raster will therefore use another technique to 'store' metadata about a raster table: constraint. A set of constraint will be applied to a raster table and those constraint will be read and displyed by the raster_column view.
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