Hillshade for British Antarctic Territory

The Reference Elevation Mosaic of Antarctica (REMA) v2.0 10m tiles that cover British Antarctic Territory were downloaded and mosaicked into a single dataset using ArcGIS Pro v3. A multidirectional hillshade was then produced using this mosaic, with a Z factor of 2 and second traditional hillshade with a Z factor of 5. Both were clipped using a polygon derived from the Antarctic Digital Database high resolution coastline polygon dataset (v7.12). The multidirectional hillshade was then overlaid on the traditional hillshade, and given a transparency of 30%. Final contrast enhancements were applied to ensure the two layers in combination achieved the desired effect. The two hillshades were shared as a single tile layer to ArcGIS Online.

Input data references:

• Coastline: Gerrish, L., Ireland, L., Fretwell, P., Cooper, P., & Skachkova, A. (2026). High resolution vector polygons of the Antarctic coastline 2 (Version 7.12) [Data set]. NERC EDS UK Polar Data Centre. https://doi.org/10.5285/13c4d2f1-8903-4d7f-8977-592121975554
• REMA v2.0 DEM: Polar Geospatial Centre and Howat, Ian, et al., 2022, “The Reference Elevation Model of Antarctica – Mosaics, Version 2”, https://doi.org/10.7910/DVN/EBW8UC, Harvard Dataverse, V1, accessed November 2023