docs: def map_pixel(self, point_x, point_y):
          '''
          geo.map_pixel(point_x, point_y)
  
          Return value of raster in location
          Note: (point_x, point_y) must belong to the geographic coordinate system and
          the coverage of the raster
          '''
          row, col = map_pixel(point_x, point_y,
                               self.x_cell_size, self.y_cell_size, self.xmin, self.ymax)
          try:
              return self.raster[row, col]
          except:
              raise RasterGeoError('Make sure the point belongs to the raster coverage \
                                   and it is in the correct geographic coordinate system.')