Description
I am trying to retrieve the exact latitude and longitude of the different glaciers but I am having some degrees of latitude/longitude discrepancies and I am not sure why...
Right now, the glacier_grid (defined here) includes some information of how to compute the latitude/longitude based on UTC projections.
As it was explained by @fmaussion in the OGGM Slack (message in support the 15th Jan 2023), "the glacier directories are in a Transverse Mercator map projection centered on the glacier. It's exactly the same as UTM, but with slightly different project parameters for each glacier."
I am trying to recover the exact coordinates based on this logic using Geodesy.jl, but I am not having much success. Here an example with Bossons glacier (RGI60-11.00773). Using the central latitude and longitude obtained from glacier_grid,
using Geodesy
x_bossom = UTMZ(-682.471, 5.1912e6, 0.0, 31,true)
tm = Geodesy.TransverseMercator(WGS84)
x₀ = 10.1335
x = -682.471
y = 5.1912e6
Geodesy.transverse_mercator_reverse(x₀, x, y , 0.9996, tm)
# Returns latitude=46.87433853329805, longitude=10.124544115391744(the actual coordines for Bossons should be latitude~=45.86, longitude~=6.86)
I would like to include this data in Glacier2D or create a simple function that allows to recover latitude and longitude from it.
@albangossard @JordiBolibar by any chance did you encounter a similar problem when doing this? I don't think @JordiBolibar and I encounter this problem before, since we never really needed the exact latitudes and longitudes at each pixel.