Generate GDAL and RichDEM ground truths for xDEM tests

[vschaffn]

Resolves #2.
Completes GlacioHack/xdem#675.

Description:

The goal of this PR is to relocate the xDEM test codes that rely on GDAL and RichDEM, so that ground truths can be generated for use in xDEM tests. The ultimate objective is to eliminate all dependencies on GDAL and RichDEM within xDEM.

Changes:

• generate_ground_truth_gdal.py: This script generates ground truths using the GDAL package, which are then used in xDEM tests.
• generate_ground_truth_richdem.py: This script generates ground truths using the RichDEM package, which are then used in xDEM tests.

Ground truths generated from GDAL and RichDEM are stored in the test_data directory in .tif format.

[duboise-cnes]

The PR code seems ok. A question: another PR is needed afterwards in XDEM code to use generated reference data ? Can you put the link of it if available ?

otherwise seems ok for me. Maybe the real check of these issues is the PR in xdem running unit tests the same way, hence my question

@vschaffn @adebardo

[vschaffn]

The PR code seems ok. A question: another PR is needed afterwards in XDEM code to use generated reference data ? Can you put the link of it if available ?

otherwise seems ok for me. Maybe the real check of these issues is the PR in xdem running unit tests the same way, hence my question

@vschaffn @adebardo

You sent this just before I create the PR in xDEM 😄
GlacioHack/xdem#675