Improve description of links tables

GLIMS-RGI / rgi_user_guide

RGI technical note document

https://glims-rgi.github.io/rgi_user_guide

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Improve description of links tables #84

Closed ezwelty closed 7 months ago

ezwelty commented 8 months ago

Updates the text and adds a table to describe the _links.csv files. See #83.

p.s. @fmaussion I notice that you broke up the overlaps by region. If I recall correctly, glaciers from some regions in RGI 7.0 overlap those of other regions in RGI 6.0, and thus why I recommended the links be processed globally. Were the overlaps (and the corresponding cluster_id, n_rgi6, n_rgi7) computed globally and then split (how?) into region files? Is cluster_id globally unique?

fmaussion commented 7 months ago

Thanks for this @ezwelty , much appreciated. You are correct that computing the links regionally is wrong - there may be overlap with neighboring regions when two are close, regardless of changes in regions between versions.

The data is now corrected and linked here: https://github.com/GLIMS-RGI/rgi_issue_tracker/issues/41

Related statistics:

removing all overlap < 200 m2 removes 1.15 km2 or overlap area globally (negligible)
the area of polygons overlapping across RGI regions is 197.47km2. This happens mostly in regions 13, 14, 15 (for reasons we know), and minimally in regions 01 and 02 because of a previous mistake in RGI6