The elevation data is served as a map service using Esri's ArcGIS Server. Click here to learn more about how we are doing it. The map services can be connected to in a variety of ways using the REST links at the bottom of the page.
ArcGIS Online is a website by Esri that provides a platform for using, creating, and sharing maps, apps, and data, and accessing authoritative basemaps. CT ECO uses ArcGIS online to share many of Connecticut's maps and make it possible for users to save and make changes to the maps. In order to save, you must have an ArcGIS Online account. If you don't have an organizational account (these cost money, or come with a paid version of ArcGIS), you can create a free, public account (with restrictions and limited functionality) for exploring the ArcGIS Online.
ArcGIS is powerful desktop GIS software by Esri. It is not free.
The REST endpoint of all of the elevation services including the footprints is https://cteco.uconn.edu/ctraster/rest/services/elevation.
The REST endpoint of the Long Island Sound water polygon is http://clear3.uconn.edu/arcgis/rest/services/LIS/LISWaterMask/MapServer.
The REST endpoint for the town boundaries and the full lidar extents as shown on the information map is https://cteco.uconn.edu/ctraster/rest/services/maps/lidar_extents/MapServer.
The REST endpoint of Elevation Contours (from 2000 base data, including 2ft, 5 ft, 10 ft, 20 ft, 50 ft, 100 ft) is https://cteco.uconn.edu/ctmaps/rest/services/Elevation/CT_Contours_2000/MapServer.