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tlohdetlohde@fediscience.org
2025-11-29

Fell behind on the making a map thing. Day 27: #Boundaries

The #EquilibriumLine marks the boundary on a #glacier between the accumulation and ablation zones. It moves up and down from year to year with changes in the climate.

Here are the equilibrium line altitudes (#ELA) for Rembesdalskaaka, an outlet glacier of #Hardangerjøkulen ice cap in #Norway.

Data & Sources:
- ELAs: WGMS (2025): Fluctuations of Glaciers (FoG) Database. World Glacier Monitoring Service (WGMS); Zurich; Switzerland. doi.org/10.5904/wgms-fog-2025-
- outline of Rembesdalskaaka: The #GLIMS Geospatial Glacier Database (Raup et al., doi:10.1016/j.gloplacha.2006.07.018)
- Elevation*: Copernicus Global DEM (30 m)
- Lakes & peaks: #OpenStreetMap

*since the mid-90s Rembesdalskaaka has thinned at ~0.8 m/yr. I have casually ignored that, and just plotted the contours for the ELA on a modern DEM. So the position of the ELAs here, can't really be relied upon. Sorry.

Put together in #matplotlib with the help of #geopandas, #shapely #osmnx with a little of labelling in #Inkscape. #Typeface is Junction by Caroline Hadilaksono & Tyler Finck (League of Moveable Type)

#30DayMapChallenge #maps #glaciology #iWantToGoToNorway #Finse

A topographical map showing the Rembesdalskåka outlet glacier of Hardangerjøkulen ice cap in Norway. Elevation is depicted by gray contours and a colour ramp from dark blue (low) to white (high). Within Hardangerjøkulen, a dashed line denotes the extent of Rembesdalskåka. Across which are several black lines, each one with a year label (from lowest elevation to highest: 1989, 1993, 2000, 1973, 2017, 1991, 1985, 2019, 1966). Around the edge of the ice cap several mountain peaks are labelled. A scale bar in the top right indicates that the whole map is ~20 km across. Several lakes are shown in a dark blue. The title / legend in the bottom left reads: 'Rembesdalskåka Equilibrium Line'. Credits along the bottom read: 'by:tlohde / Copernicus Global DEM (ESA) / Raup et al., (2007) The GLIMS Geospatial Glacier Database / Fluctuations of Glaciers Database, World Glacier Monitoring Service / OpenStreetMap contributors'
Jesus Castagnetto 🇵🇪jmcastagnetto
2023-07-03

For this week's , a map of , showing the areas in the country, using the data from the (glims.org/) database, for the year 2021.
Tried to use a color palette based on the Peru color ()
code: github.com/jmcastagnetto/my_ma

Location as of 2021 of the glacier areas in Peru, using the GLIMS data

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