_query_raster_size()

rtreader.RasterReader._query_raster_size (   self,   dim,   force = False  )

protected

Definition at line 167 of file rtreader.py.

    def _query_raster_size(self, dim, force = False):
        if self._sizes is None or force is True:
            sql = 'SELECT st_width(%s), st_height(%s), st_numbands(%s) FROM %s' % \
                     (self._column, self._column, self._column, self._table)
            if len(self._where) > 0:
                sql += ' WHERE %s' % self._where
                
            self._log(sql)
            self._sizes = self._query_single_row(sql)
 
        if self._sizes is None:
            raise RasterError("Failed to query raster size of dim {} with force {}".format(dim, force))
        return self._sizes[dim]
 

References rtreader.RasterReader._column, rtreader.RasterReader._log(), rtreader.RasterReader._query_single_row(), rtreader.RasterReader._sizes, rtreader.RasterReader._table, and rtreader.RasterReader._where.

Referenced by rtreader.RasterReader._get_height(), rtreader.RasterReader._get_num_bands(), and rtreader.RasterReader._get_width().

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