Gemma (short for Geospatial Engine for Mass Mapping Applications) allows you lot to practice Google Maps amongst information from a release of unlike sources.
It is possible to practice maps amongst gemma amongst layers from MapTube, SurveyMapper, OpenStreetMap together with from your ain data. Gemma fifty-fifty has an accompanying iPhone app that lets you lot tape observations on the teach together with hence upload them to a gemma map.
Gemma was created past times the University College London - Centre for Spatial Analysis. It is non surprising hence that it plant really good amongst CASA's ain SurveyMapper (a geographic survey together with polling tool) together with amongst MapTube.
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