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Aerial imagery from sources such as Google Earth have some horizontal positional accuracy problems. A 2013 paper from the Earth Institute at Columbia University showed that the Root Mean Square Error (RMSE) can be significant (8.2m for Google Maps in the study). The RMSE of horizontal accuracy appears to vary greatly between studies. Reasons for this may ...


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There are a variety of approaches you could take, including: Save your map as a KML file, open that file in QGIS, and save as gpx. Use an online converter like GPS Visualizer. You can paste your map's URL directly into the tool as presented in this tutorial. Other possible converters include GMapToGPX, TakeItWithMe, and several others available via search. ...


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In OpenStreetMap, stylesheets, styling, or rules are terms generally to describe the determines what features (Roads or no roads? If yes, which ones?) are drawn at a particular zoom level and how (is a road black? with or without the road's name?). The stylesheet/rules reads each feature's tags. The rendering software (usually its mapnik) will read the ...


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1st. You will likely have to go province by province, as provinces usually manage spatial data like that and may have to pay for it. For Saskatchewan you might find what you're looking for here or here. 2nd. You will need to then convert the data to kml and upload it to fusion tables. 3rd. Query out what you want to display in fusion tables and then show ...


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At some point you'll have to convert from Google native overlays to WKT. You can either do it in your frontend, using for example Wicket.js or in your backend, using postgis's ST_FromGeoJson. Keep in mind that there's no geoJSON spec for rectangles. They're just polygons. If you use Wicket.js you will be able to ingest a WKT BOX to generate a ...



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