Time-aware maps are a very handy way to boil down complex data sets that involve time component. I did this on the desktop a while ago - to reduce the CLIWOC maps of ships captains logs from 1650 to 1850 into dynamic layers, rather than arbitrary decade time slices - and posted them more recently on arcgis.com as map packages and mashed them on AWS with golbal vector shorelines.
Now we can post time-aware maps directly to arcgis.com, and I thought I'd try it first on my popular Where in the World is Andrew map - I related my peregrinations so often ("do you want the short or the long version?") that I made a simple map using a text file and Java script on Google Maps. My new catalog blog relates why and how I tried in on ArcGIS Online, and how I found an unexpected benefit: to explain an arcane mapping concept of Great Circles to my family, as illustrated below.
|click image to enlarge.|
This first step to create a time-stamped web map will be chronicled in my companion catalog blog and is posted here:
- ArcGIS Home Use, ArcGIS Online and Amazon Web Services have modest fees
- QGIS is free, wheras ArcGIS Online and Amazon Web Services had free tiers
- beta testing gave me free access to GeoCloud2, giscloud.com and 1SpatialCloud
- part of Volunteered Geography are free data such as Wilson's list and UN Data