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When running the following code to reproject a epsg:4326 countries file to orthographic:

newCRS = CRS.decode("AUTO:42003,1,-100,45");
mapFrame.getMapContent().getViewport().setCoordinateReferenceSystem(newCRS);

The following error occurs: WARNING: Possible use of "Orthographic" projection outside its valid area. Latitude 112°43.8'S is out of range (±90°).

Does anyone know how to get the orthographic projection to work?

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  • you probably have your latitude and longitude switched, but we'd need to see the value of getViewPort's bbox before you transform it
    – Ian Turton
    Commented Oct 23, 2018 at 15:37
  • Bounds before reprojection: ReferencedEnvelope[-180.0 : 180.00000190734863, -90.0 : 83.57026863098145]. After: ReferencedEnvelope[-180.0 : 180.00000190734858, -112.73017238719122 : 106.30044101817266]
    – ccarlow
    Commented Oct 23, 2018 at 16:02
  • looks like a long/lat box but should probably be a lat/long one - need to see the WKT of the original CRS to be sure
    – Ian Turton
    Commented Oct 23, 2018 at 16:09
  • GEOGCS["WGS 84", DATUM["World Geodetic System 1984", SPHEROID["WGS 84", 6378137.0, 298.257223563, AUTHORITY["EPSG","7030"]], AUTHORITY["EPSG","6326"]], PRIMEM["Greenwich", 0.0, AUTHORITY["EPSG","8901"]], UNIT["degree", 0.017453292519943295], AXIS["Geodetic longitude", EAST], AXIS["Geodetic latitude", NORTH], AUTHORITY["EPSG","4326"]]ReferencedEnvelope[-180.0 : 180.00000190734858, -112.73017238719122 : 106.30044101817266]
    – ccarlow
    Commented Oct 23, 2018 at 16:19
  • To: PROJCS["WGS 84 / Auto Orthographic", GEOGCS["WGS84(DD)", DATUM["WGS84", SPHEROID["WGS84", 6378137.0, 298.257223563]], PRIMEM["Greenwich", 0.0], UNIT["degree", 0.017453292519943295], AXIS["Geodetic longitude", EAST], AXIS["Geodetic latitude", NORTH]], PROJECTION["Orthographic"], PARAMETER["central_meridian", 0.0], PARAMETER["latitude_of_origin", 0.0], PARAMETER["scale_factor", 1.0], PARAMETER["false_easting", 0.0], PARAMETER["false_northing", 0.0], UNIT["m", 1.0], AXIS["Easting", EAST], AXIS["Northing", NORTH]]
    – ccarlow
    Commented Oct 23, 2018 at 16:19

1 Answer 1

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An Orthographic Projection is of a hemisphere so if you try to display the whole world (as you seem to be) it will throw a ProjectionExcpetion (Point outside of hemisphere of projection) at least in recent versions.

But you seem to be hitting an earlier issue that your input bounding box is almost square (-180.0 : 180.00000190734858, -112.73017238719122 : 106.30044101817266) and GeoTools is complaining that the Earth isn't that tall (-112 is clearly below the South Pole (-90)) and so throws an earlier error than I'm seeing. With a smaller dataset your code works fine.

enter image description here

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