If there is no solution to automatically "patch" this issue, meanwhile we could edit a wiki page describing a solution (like passing a proj.4 chain) to the location's creation.Īt this stage, I'm not sure what the solution would be. Ok bu sooner or later, users may have to manage data in this "projection" system, and they might be puzzled (angry) to see it does not work despite a proper location definition via the epsg code. ArcGIS Server, and ArcGIS Pro, as well as CommunityViz, BASINS, GEODA, GRASS, MapWindows, Hazus, QGIS, SWAT.
#Proj info of pennsylvania grass gis code#
Several official administrations forbid its use.Īs discussed during the code sprint, the issue is because of the very weird nature of this "projection" system Contact Center for GIS and Spatial Analysis. The Pennsylvania GIS resource and implementation guide : a handbook for understanding Geographic Information Systems /. The most reasonable conclusion, however, was to not use this system at all because of it's weird nature. In the discussions, one idea that came up was to provide alternative datum transformation parameters for this system, one on the sphere and one on the wgs84 ellipsoid. Boots, 1998, Spatial tessellations, in Geographic Information Systems: Priciples, Techniques Iussues,2nd Edition, edited by P.A. This program uses the projection definition and parameters which are stored in the PROJINFO and PROJUNITS files in the PERMANENT mapset directory for every GRASS location. The first set of maps are geomorphons calculated using the default. The proj.4 definition of this projection system seems to be somewhat of a hack. In the GRASS GIS package a program v.proj is provided to convert 'vector' maps, transferring topology and attributes as well as node locations. This dataset consists of two sets of geomorphon maps for all 67 counties of Pennsylvania. AFAIU, in GRASS, we have not foreseen the option to declare one datum, but using a different ellipsoid than the one normally linked to that datum. It uses the WGS 84 datum (which normally implies the WGS 84 ellipsoid), but actually develops the coordinates on a sphere. Relative to WGS 84 / World Mercator (CRS code 3395) errors of 0.7 percent in scale and differences in northing of up to 43km in the map (equivalent to 21km on the ground) may arise."
"Uses spherical development of ellipsoidal coordinates. As discussed during the code sprint, the issue is because of the very weird nature of this "projection" system: The Pennsylvania Department of Transportation (PennDOT) has completed three years of construction today on the 62.6 million Section 101 contract to widen.
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