http://bolin.su.se/data/schytt-mannerfelt-2022-marma-outlines-1 Erik Schytt Mannerfelt Bolin Centre Database 2022 Datafile Terrestrial Glaciers Glacier Outline Polygon Sweden Massbalance Tarfala Research Station Mårma Earth science > Cryosphere > Glaciers/ice sheets > Glaciers Erik Schytt Mannerfelt 2022-12-02T12:24:02+00:00 English 1 The dataset consists of two files containing polygons of the two glaciers in the Mårma massif, and one similarly structured file for nearby snow pathches, for dates listed below. An image file is also provided that illustrates the polygons. ##### Filenames and content - `Marma_glacier_outlines_1959-2021.geojson`: Outlines of Mårmaglaciären. - `Marmapakte_glacier_outlines_1959-2021.geojson`: Outlines of Mårmapakteglaciären. - `Snowpatches_1959-2021.geojson`: Outlines of large patches of snow outside of the glacier extents. - `marma_outlines_map.jpg`: Image file that illustrates the data. All polygons are in a `GeoJSON` file format, readable by a multitude of tools like QGIS, ArcGIS, GeoPandas or any tool that can read JSON files. The image is a JPEG raster data file. ##### Dates for the polygons 1. 1959-09-23 2. 1978-07-21 3. 1991-07-31 4. 2008-09-10 5. 2016-09-17 6. 2021-08-10 The outlines have been drawn from Digital Elevation Models (DEMs), [available as a separate dataset](https://bolin.su.se/data/schytt-mannerfelt-2022-marma-dem-1) by Schytt Mannerfelt (2022), based on aerial images and airborne laser scanning. Erik Schytt Mannerfelt was affiliated with the Department of Physical Geography, Stockholm University, when this dataset was prepared.