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You have to download the PC version zip file, which contains a bunch of single garmin img tiles, including contour img tiles. Mkgmap needs all those single img files for merging: java -Xmx3000M -jar mkgmap.jar --show-profiles=1 --gmapsupp 3*.img OpenTopoMap.TYP The file you downloaded is probably the composite file, usually called gmapsupp.img. It would ...


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I'm not aware of any empirical studies, but my view is that smartphones are a better option than handheld GPS devices. Many smartphones these days support both GPS and GLONASS, and they support modern data capture applications, such as Fulcrum. Couple a smartphone with a bluetooth GNSS device, from Trimble or others, and you have a pretty damn good ...


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Unless there is a WAAS capable or not distinction (or similar error correction), consumer units aren't likely to vary enough, or rather be accurate enough, even with new tech to warrant an upgrade. That said, newer chipsets can potentially achieve locks faster, have better signal processing, or have better antenna designs. The units themselves may also ...


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I posted a python script to use from ArcGIS here: Exporting 3GB ArcGIS Raster to KML without losing resolution? KML is uncompressed KMZ. The output here will work in either application. Georeferencing the scans could be done any number of ways; write a world file manually, use software. You can do it in Google Earth. But I feel the interface is very clunky ...


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I posted a python script to use from ArcGIS here: Exporting 3GB ArcGIS Raster to KML without losing resolution? The different models support different numbers of tiles. You have to look at this limitation, the extent of imagery you want to use, and the minimum resolution you want to use. Then you need to possibly create multiple files from your original ...



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