# tlohde

Barnes Ice Cap

A map titled: Barnes Ice Cap, Baffin Island, Nunavut, Canada. The map is comprised of a Sentinel-2 RGB image satellite image showing the ice cap which is up to 60 km across and in excess of 100 km long. Surrounding the ice cap are mountains, some with snow covered peaks, others rocky, along with many bright blue lakes. Overlaid on top of the ice cap are flow lines indicating the direction of ice flow, and colored according to the speed of flow. The lines clearly show the ice divide in the middle of the ice cap. The color of the flow lines is on a logarithmic scale from 0 to 100 m/yr, as shown in the color-bar beneath the main plot. In the upper left is an inset showing where Baffin Island's position to the west of Greenland, and above the north eastern limit of North America. Image credits in the bottom left read: 'by:tlohde / (C) contains modified Copernicus Sentinel-2 data / NASA MEaSURE's ITS_LIVE (Gardner et al., 2025)'
Barnes Ice Cap: Ice flow over Barnes Ice Cap, Baffin Island. Made for day 2 of the #30DayMapChallenge: Lines
projection North Polar Stereo: central longitude: 45W, true scale latitude: 70N
tools Python: matplotlib, stackstac, planetarycomputer, xarray, rioxarray & cartopy
data Background image from Sentinel-2; Ice Velocity data generated using auto-RIFT (Gardner et al., 2018) and provided by the NASA MEaSUREs ITS_LIVE project (Gardner et al., 2025).
font Recursive Sans & Mono, by Stephen Nixon, with Lisa Huang, Katja Schimmel. Rafał Buchner & Ben Kiel
comments My crude cloud-free composite code (take the median over a stack of images that you know already have low cloud cover) was playing up a bit; and my old laptop struggling with the size of this image. I'm somewhat surprised that ice velocities aren't higher towards the lake towards the top right of this frame (where's north ed?). Charming little inset, though.
date 02/11/2025