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How can I identify this coordinate system? When I load the .shp with QGIS I get the correct linear mapping. However when I try to convert to GeoJSON and plot with something like Leaflet.js I get nothing. These coordinates exist roughly around: 35.161066,-114.576794

[(955999.8911220022, 26397850.011872), (955998.9291220009, 26397799.942871995), (955998.9461220019, 26397798.020871997)]

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    Have you tried doing, in QGIS, a right click on the layer, then layer properties and at last information?
    – JGH
    Jan 14, 2020 at 18:23
  • I have now - Geometry: Line(MultilineString); CRS: EPSG:3421 - NAD83 / Nevada East (ftUS) - Projected; Extent: 955736.6651220023632050,26397765.5478719994425774 : 957601.4161220006644726,26397850.0118720009922981 can I convert this to lat/long coodinate or similar mapping for use in something like leaflet.js?
    – Derek_P
    Jan 14, 2020 at 18:34
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    The default CRS for GeoJSON is 4326
    – JGH
    Jan 14, 2020 at 18:38
  • You could use those coordinates in Leaflet, but how, that's for a different focused question.
    – TomazicM
    Jan 14, 2020 at 18:47

2 Answers 2

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It is some version of State Plane Nevada East with measurements in feet. For example, choosing ESRI:102707 from the EPSG database (http://epsg.io/102707) yields coordinates in that range near 35.16 N lat, -114 W long.

Note that there are several alternative specifications of the State Plane Nevada East projection, so if you don't get the exact one, your coordinates may be off by a couple of meters. But the one I referred to is probably the most common if the original data source was, say, an ESRI shapefile.

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It seems to be EPSG:3421. (955999, 26397850) translates to Lat 35.1612555° Lon -114.5801733° at epsg.io.

When looking for projected CRS on the basis of given coordinates, I'm using SHPProjFinder tool. This is local Java program, based on similar algorihms as projfinder.com, but with much improved efficieny.

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