CairnBUILDER is was an interactive mapping application that enables users to draw trails and markers over a topographic map service.

CairnBUILDER is was a collaboration between Brian Sims and I and our entry into the ESRI 2010 Mashup Contest.

CairnBUILDER uses used the ESRI ArcGIS Online JavaScript API to integrate user generated data (trails and way points, or cairns) with data from other REST web services such as a the USGS Elevation Query Web Service and a place name service from

Brian had the idea, and designed the interface. I came up with an implementation and hammered out all the SQL, C#, and JavaScript to get an application up and running in the little more than a week that we had before the contest ended.