Add topographical shading to map generated by Geogrid simulator about salem

[zxdawn]

I checked the condition in datasets.py

salem/salem/datasets.py

Lines 178 to 181 in 2d10174

	# Some necessary checks
	if (np.max(sub_x) < 0) or (np.min(sub_x) > mx) or \
	(np.max(sub_y) < 0) or (np.min(sub_y) > my):
	raise RuntimeError('subset not valid')

Here's the result:

max(sub_x) 148234
max(sub_y) 31341
min(sub_x) 116714 mx 383
min(sub_y) 7316 mx 283

It seems something is wrong in transform.

[fmaussion]

Thanks!

To use topographical shading in salem, you have to download your own topography data. In this line:

maps[0].set_topography(get_demo_file('hef_srtm.tif'))

you use the topography file hef_srtm.tif, which is a very small subset of the Alps.

[zxdawn]

@fmaussion Thank you! I find the link to download the data. By the way, I decided to use geo_em.nc to add the color. Thank you for your excellent work! It saves a lot time.