This zipfile contains a pair of add-ins that allow the user to find the area and perimeter of selected polygons. One add-in, Click Measure.rsc, allows the user to click on a polygon to see its area and perimeter. The other, Selection Measure.rsc, allows the user to get the total area, perimeter, and the total length of shared boundaries for the polygons in a selection set.
Free and open source (GPLv3 license).
Educator John Van Hoesen introduces StoryMap.js, “a stunningly simple tool for creating beautifully designed stories on the Web,” from the Knight Lab at Northwestern University.