wradlib.georef.rect.get_radolan_grid¶
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wradlib.georef.rect.get_radolan_grid(nrows=None, ncols=None, trig=False, wgs84=False)¶ Calculates x/y coordinates of radolan grid of the German Weather Service
Returns the x,y coordinates of the radolan grid positions (lower left corner of every pixel). The radolan grid is a polarstereographic projection, the projection information was taken from RADOLAN-RADVOR-OP Kompositformat_2.2.2 [DWD, 2009]
Coordinates for 900km x 900km grid¶ Coordinate
lon
lat
x
y
LowerLeft
3.5889E
46.9526N
-523.4622
-4658.645
LowerRight
14.6209E
47.0705N
376.5378
-4658.645
UpperRight
15.7208E
54.7405N
376.5378
-3758.645
UpperLeft
2.0715E
54.5877N
-523.4622
-3758.645
Coordinates for 1100km x 900km grid¶ Coordinate
lon
lat
x
y
LowerLeft
4.6759E
46.1929N
-443.4622
-4758.645
LowerRight
15.4801E
46.1827N
456.5378
-4758.645
UpperRight
17.1128E
55.5342N
456.5378
-3658.645
UpperLeft
3.0889E
55.5482N
-433.4622
-3658.645
Coordinates for 1500km x 1400km grid¶ Coordinate
lon
lat
x
y
LowerLeft
2.3419E
43.9336N
-673.4622
-5008.645
- Parameters
nrows (int) – number of rows (460, 900 by default, 1100, 1500)
ncols (int) – number of columns (460, 900 by default, 1400)
trig (boolean) – if True, uses trigonometric formulas for calculation if False, uses osr spatial reference system to transform between projections trig is recommended to be False, however, the two ways of computation are expected to be equivalent.
wgs84 (boolean) – if True, output coordinates are in wgs84 lonlat format (default: False)
- Returns
radolan_grid (
numpy.ndarray) – Array of shape (rows, cols, 2) xy- or lonlat-grid.
Examples
>>> # using osr spatial reference transformation >>> import wradlib.georef as georef # noqa >>> radolan_grid = georef.get_radolan_grid() >>> print("{0}, ({1:.4f}, {2:.4f})".format(radolan_grid.shape, *radolan_grid[0,0,:])) # noqa (900, 900, 2), (-523.4622, -4658.6447)
>>> # using pure trigonometric transformations >>> import wradlib.georef as georef >>> radolan_grid = georef.get_radolan_grid(trig=True) >>> print("{0}, ({1:.4f}, {2:.4f})".format(radolan_grid.shape, *radolan_grid[0,0,:])) # noqa (900, 900, 2), (-523.4622, -4658.6447)
>>> # using osr spatial reference transformation >>> import wradlib.georef as georef >>> radolan_grid = georef.get_radolan_grid(1500, 1400) >>> print("{0}, ({1:.4f}, {2:.4f})".format(radolan_grid.shape, *radolan_grid[0,0,:])) # noqa (1500, 1400, 2), (-673.4622, -5008.6447)
>>> # using osr spatial reference transformation >>> import wradlib.georef as georef >>> radolan_grid = georef.get_radolan_grid(900, 900, wgs84=True) >>> print("{0}, ({1:.4f}, {2:.4f})".format(radolan_grid.shape, *radolan_grid[0,0,:])) # noqa (900, 900, 2), (3.5889, 46.9526)
See Polar Stereographic Projection.
- Raises