Challenger Expedition DIY Web Map

[Update: Spilhaus video here c/w DIY add-your-own image on eve of 150th anniversary]

The last two blogposts showed how to create correct polar maps in ArcGIS and QGIS here from publicly posted class notes blogged.

Let's look at now creating complete maps in AGOL from publicly available data, and analyzing it over time to see their historic significance. This results in this web map of the HMS Challenger 1873-1876 Expedition: