Bridging the gap between desktop and on-line GIS follows the first and second instalment, online vector GIS and spatial data validation. GisCloud introduced a free Esri extension to load features and attributes to its file system. This follows other services such as Arc2Earth and Arc2Google, except in the vector domain. Having both Esri @ home and a private cloud I put this new extension through its paces.
East Anglia Fenlands mashup on arcgis.com looks like this on giscloud.com. But how do I get there? First you download and install the extension, and it's added to ArcMap for you. Pressing the single button in ArcMap pops up this screen:
|click on image to enlarge|
As with online validation, the usual lessons learned are almost as interesting as the process itself... It's so easy, we have to get something more out if it, don't we? Here are mine:
- UK Ordnance survey data come in British National Grid (ORD SURV GB) with a defined datum but not ellipsoid, which posts as Transverse Mercator with unnamed ellipsoid and datum, and thus fails the GIScloud import but posts as unprojected
- a simple reprojection to WGS84 in the file geodatabase fixed that and posts like so:
You can follow Socium's on-line validation output (triangles where adjacent polygons differ by more than one unit). The best part of it, however, is that it took longer to write this blogpost than it took to upload, fix and re-upload the data! How's that for ease-of-use from Esri and giscloud.com?