Gemma (short for Geospatial Engine for Mass Mapping Applications) allows you to create Google Maps with data from a number of different sources.
It is possible to create maps with gemma with layers from MapTube, SurveyMapper, OpenStreetMap and from your own data. Gemma even has an accompanying iPhone app that lets you record observations on the go and then upload them to a gemma map.
Gemma was created by the University College London - Centre for Spatial Analysis. It is not surprising then that it works very well with CASA's own SurveyMapper (a geographic survey and polling tool) and with MapTube.
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