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I think the app called Oruxmaps is right for you


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Open Data Kit combined with ODK Collect is perfect for the field survey portion of your question. It is free and open-source software. ODK Aggregate is the server component where your data will be stored. ODK Collect is the app you'll install on the Android phone of each volunteer. This video is a great overview of the Open Data Kit suite of tools. Go to ...


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It seems like you are looking for a couple of different resources. Now, I actually found an interesting administrative resource you may want to look into here. From what I can tell, it is tax roll data that lists information on businesses that include address, and census block group id, thus allowing it to fit into GIS models. Not only that, according to the ...


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OpenStreetMap is your best bet. You can download the data using built-in tools in QGIS. See the step-by-step instructions at http://www.qgistutorials.com/en/docs/downloading_osm_data.html


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Cloudmade do extracts from OpenStreetMap data suitable for loading into Satnavs or GIS packages. For example, the Florida data is here: http://download.cloudmade.com/americas/northern_america/united_states/florida#downloads_breadcrumbs if you download and unzip florida.poi.gpx.zip you'll see a florida_Eating_Drinking.gpx file which has coords and names of ...


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I would create a geometry collection from the points using st_collect(): http://postgis.refractions.net/documentation/manual-svn/ST_Collect.html Then I would create convex hull from the point collection: http://postgis.org/docs/ST_ConcaveHull.html If you have a table of point geometries called testpoints where geometry column name was the_geom, this should ...



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