_query_value()

rtreader.RasterReader._query_value (   self,   band,   x,   y  )

protected

Definition at line 156 of file rtreader.py.

    def _query_value(self, band, x, y):
        sql = 'SELECT st_value(%s, %d, %d, %d) FROM %s' % \
                 (self._column, band, x, y, self._table)
        if len(self._where) > 0:
            sql += ' WHERE %s' % self._where
 
        row = self._query_single_row(sql)
        if row is None:
            raise RasterError("Value of pixel %dx%d of band %d is none" %(x, y, band))
        return row[0]
    

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

Referenced by rtreader.RasterReader.get_value().

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