[R-sig-Geo] Warning message: In showSRID(uprojargs, format = "PROJ", multiline = "NO")?

[Roger Bivand]

It depends on your software and workflow. If you check the versions of PROJ and GDAL with rgdal::extSoftVersion(), you will probably find > 5 and > 2. If you then take sp::wkt() of the sp object, you should see a correct WKT2 representation of the CRS. Packages using this should not show degradation, but those only using the Proj4 string may show degradation. See https://rgdal.r-forge.r-project.org/articles/CRS_projections_transformations.html and
https://www.r-spatial.org/r/2020/03/17/wkt.html for details.

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Roger Bivand
Norwegian School of Economics, Bergen, Norway
roger.bivand using nhh.no

________________________________
Fra: R-sig-Geo <r-sig-geo-bounces using r-project.org> p� vegne av Michal Kvasni�ka <michal.kvasnicka using econ.muni.cz>
Sendt: tirsdag 21. juli 2020, 16:08
Til: r-sig-geo using r-project.org
Emne: [R-sig-Geo] Warning message: In showSRID(uprojargs, format = "PROJ", multiline = "NO")?

Hello. I have a sfc_MULTILINESTRING object called zz. It is in CRS EPSG:5514 ("S-JTSK / Krovak East North"). When I convert it to sp via as(zz, "Spatial"), I get the following warning: Warning message: In showSRID(uprojargs, format = "PROJ", multiline = "NO") : Discarded datum Unknown based on Bessel 1841 ellipsoid in CRS definition, but +towgs84= values preserved Could you help me understand what does this mean and whether it is serious? I use: R version 4.0.2 (2020-06-22) Platform: x86_64-pc-linux-gnu (64-bit) Running under: Ubuntu 20.04 LTS sf 0.9-5 sp 1.4-2 rgdal 1.5-12 rgeos 0.5-3 gdal 3.0.4 geos 3.8.0 Many thanks for your help. Best wishes, *Ing. Michal Kvasni�ka, Ph.D.* *Masaryk University | School of Economics and Administration* Department of Economics A: Lipov� 41a | 602 00 Brno E: michal.kvasnicka using econ.muni.cz | W: www.econ.muni.cz/~qasar [[alternative HTML version deleted]] _______________________________________________ R-sig-Geo mailing list R-sig-Geo using r-project.org https://stat.ethz.ch/mailman/listinfo/r-sig-geo

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