[PROJ] ESRI deprecated CRS

[Javier Jimenez Shaw]

I found a CRS in proj.db that seems to be deprecated, but I do not
understand why exactly (or what does deprecated mean)

NAD_1983_StatePlane_Virginia_South_FIPS_4502_Feet

(I guess it happens to other CRSs as well. Let's focus in this one)

in proj.db (table projected_crs) appears as ESRI:102747, deprecated
I ended up in this repo, where I think we get the ESRI CRSs
https://github.com/Esri/projection-engine-db-doc/blob/master/json/pe_list_projcs.json
(json is easier to read than csv)

That CRS appears twice in the file, with exactly the same name. The only
differences I can find are:
 - wkid
 - authority / version
 - deprecated

  { "wkid": 2284,
    "latestWkid": 2284,
    "macro": "PE_PCS_NAD_1983_VA_S_FT",
    "name": "NAD_1983_StatePlane_Virginia_South_FIPS_4502_Feet",
    "wkt": "PROJCS[\"NAD_1983_StatePlane_Virginia_South_FIPS_4502_Feet\",GEOGCS[\"GCS_North_American_1983\",DATUM[\"D_North_American_1983\",SPHEROID[\"GRS_1980\",6378137.0,298.257222101]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433]],PROJECTION[\"Lambert_Conformal_Conic\"],PARAMETER[\"False_Easting\",11482916.66666666],PARAMETER[\"False_Northing\",3280833.333333333],PARAMETER[\"Central_Meridian\",-78.5],PARAMETER[\"Standard_Parallel_1\",36.76666666666667],PARAMETER[\"Standard_Parallel_2\",37.96666666666667],PARAMETER[\"Latitude_Of_Origin\",36.33333333333334],UNIT[\"Foot_US\",0.3048006096012192]]",
    "description": "NAD 1983 SPCS Virginia South (Feet)",
    "authority": "EPSG",
    "version": "5.3(9.0.0)",
    "deprecated": "no",
    "areaname": "USA - Virginia - SPCS - S",
    "extent":
    { "slat": 36.54,
      "nlat": 38.28,
      "llon": -83.68,
      "rlon": -75.31
    }
  },

  { "wkid": 102747,
    "latestWkid": 2284,
    "macro": "PE_PCS_NAD_1983_VA_S_FT",
    "name": "NAD_1983_StatePlane_Virginia_South_FIPS_4502_Feet",
    "wkt": "PROJCS[\"NAD_1983_StatePlane_Virginia_South_FIPS_4502_Feet\",GEOGCS[\"GCS_North_American_1983\",DATUM[\"D_North_American_1983\",SPHEROID[\"GRS_1980\",6378137.0,298.257222101]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433]],PROJECTION[\"Lambert_Conformal_Conic\"],PARAMETER[\"False_Easting\",11482916.66666666],PARAMETER[\"False_Northing\",3280833.333333333],PARAMETER[\"Central_Meridian\",-78.5],PARAMETER[\"Standard_Parallel_1\",36.76666666666667],PARAMETER[\"Standard_Parallel_2\",37.96666666666667],PARAMETER[\"Latitude_Of_Origin\",36.33333333333334],UNIT[\"Foot_US\",0.3048006096012192]]",
    "description": "NAD 1983 SPCS Virginia South (Feet)",
    "authority": "Esri",
    "version": "8.0.1",
    "deprecated": "yes",
    "areaname": "USA - Virginia - SPCS - S",
    "extent":
    { "slat": 36.54,
      "nlat": 38.28,
      "llon": -83.68,
      "rlon": -75.31
    }
  },


I do not know what does it mean. Has ESRI deprecated its own CRS, but
includes the EPSG one (btw, which one?)... with exactly the same info and
name?
The consequence is that it appears (only once) as deprecated in proj.db. Is
that intended?

Making this query
SELECT auth_name, code, name, deprecated FROM projected_crs WHERE name LIKE
"%Virginia%South%"
I realized that the deprecated ones are duplicated in a similar way in ESRI
file. The non deprecated ones (from CORS96) are not "duplicated" in the
ESRI file. Is there any reason behind that?

A more general question: What does mean that a CRS is deprecated?

Thanks
.___ ._ ..._ .. . ._.  .___ .. __ . _. . __..  ... .... ._ .__
Entre dos pensamientos racionales
hay infinitos pensamientos irracionales.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/proj/attachments/20210105/9a22a236/attachment.html>