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<p>Hi,</p>
<p>While I am not a CRS/proj wiz kid, a deprecated CRS is
outdated. Changes can be in the parameters or simple things like
the name. Deprecated does not mean it's not good but likely not
currently used by the state because of changes to the parameter.
To my knowledge <br>
</p>
<p>102747 in proj.4 is</p>
<pre id="s_proj4_text" style="box-sizing: border-box; margin: 10px 0px; padding: 10px; border: 0px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-weight: 400; font-stretch: inherit; font-size: 11px; line-height: inherit; font-family: OpenSansRegular, Arial, "Geneva CE", lucida, sans-serif; vertical-align: baseline; background: rgb(243, 244, 247); color: rgb(60, 74, 105); overflow: auto; border-radius: 10px; overflow-wrap: break-word; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;">+proj=lcc +lat_1=36.76666666666667 +lat_2=37.96666666666667 +lat_0=36.33333333333334 +lon_0=-78.5 +x_0=3499999.999999999 +y_0=1000000 +datum=NAD83 +units=us-ft +no_defs</pre>
<div class="moz-cite-prefix">and 2284 in proj.4 is</div>
<div class="moz-cite-prefix">
<pre id="s_proj4_text" style="box-sizing: border-box; margin: 10px 0px; padding: 10px; border: 0px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-weight: 400; font-stretch: inherit; font-size: 11px; line-height: inherit; font-family: OpenSansRegular, Arial, "Geneva CE", lucida, sans-serif; vertical-align: baseline; background: rgb(243, 244, 247); color: rgb(60, 74, 105); overflow: auto; border-radius: 10px; overflow-wrap: break-word; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;">+proj=lcc +lat_1=37.96666666666667 +lat_2=36.76666666666667 +lat_0=36.33333333333334 +lon_0=-78.5 +x_0=3500000.0001016 +y_0=999999.9998983998 +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +units=us-ft +no_defs
</pre>
</div>
<div class="moz-cite-prefix">According to <a class="moz-txt-link-freetext" href="https://epsg.io/102747">https://epsg.io/102747</a> and
<a class="moz-txt-link-freetext" href="https://epsg.io/2284">https://epsg.io/2284</a>.</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">As you can see, there are small
differences like the reversal of the standard parallel 1 and 2.
Others will give you more information.</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">Nicolas<br>
</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">On 2021-01-05 5:44 p.m., Javier Jimenez
Shaw wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CADRrdKtjfZToKKhSd6Cem0FHsQV7SFKQYegV09qoP2ZcerR4ow@mail.gmail.com">
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<div>I found a CRS in proj.db that seems to be deprecated, but I
do not understand why exactly (or what does deprecated mean)</div>
<div><br>
</div>
<div><span style="color:rgb(32,33,36);font-family:"Roboto Mono",monospace;font-size:11px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:pre-wrap;word-spacing:0px;background-color:rgb(250,250,250);text-decoration-style:initial;text-decoration-color:initial;display:inline;float:none">NAD_1983_StatePlane_Virginia_South_FIPS_4502_Feet</span></div>
<div>
<div>
<div dir="ltr" class="gmail_signature"
data-smartmail="gmail_signature"><br>
</div>
<div class="gmail_signature"
data-smartmail="gmail_signature">(I guess it happens to
other CRSs as well. Let's focus in this one) <br>
</div>
<div class="gmail_signature"
data-smartmail="gmail_signature"><br>
</div>
<div class="gmail_signature"
data-smartmail="gmail_signature">in proj.db (table
projected_crs) appears as ESRI:102747, deprecated</div>
<div class="gmail_signature"
data-smartmail="gmail_signature">I ended up in this repo,
where I think we get the ESRI CRSs<br>
</div>
<div class="gmail_signature"
data-smartmail="gmail_signature"><a
href="https://github.com/Esri/projection-engine-db-doc/blob/master/json/pe_list_projcs.json"
moz-do-not-send="true">https://github.com/Esri/projection-engine-db-doc/blob/master/json/pe_list_projcs.json</a>
(json is easier to read than csv)<br>
</div>
<div class="gmail_signature"
data-smartmail="gmail_signature"><br>
</div>
<div class="gmail_signature"
data-smartmail="gmail_signature">That CRS appears twice in
the file, with exactly the same name. The only differences
I can find are:</div>
<div class="gmail_signature"
data-smartmail="gmail_signature"> - wkid</div>
<div class="gmail_signature"
data-smartmail="gmail_signature"> - authority / version</div>
<div class="gmail_signature"
data-smartmail="gmail_signature"> - deprecated<br>
</div>
<div class="gmail_signature"
data-smartmail="gmail_signature"><br>
</div>
<div class="gmail_signature"
data-smartmail="gmail_signature">
<pre style="color:rgb(0,0,0);font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;word-spacing:0px;text-decoration-style:initial;text-decoration-color:initial;white-space:pre-wrap"> { "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
}
},</pre>
</div>
<div class="gmail_signature"
data-smartmail="gmail_signature">
<pre style="color:rgb(0,0,0);font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;word-spacing:0px;text-decoration-style:initial;text-decoration-color:initial;white-space:pre-wrap"> { "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
}
},</pre>
</div>
<div class="gmail_signature"
data-smartmail="gmail_signature"><br>
</div>
<div class="gmail_signature"
data-smartmail="gmail_signature">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?</div>
<div class="gmail_signature"
data-smartmail="gmail_signature">The consequence is that
it appears (only once) as deprecated in proj.db. Is that
intended?</div>
<div class="gmail_signature"
data-smartmail="gmail_signature"><br>
</div>
<div class="gmail_signature"
data-smartmail="gmail_signature">Making this query</div>
<div class="gmail_signature"
data-smartmail="gmail_signature">SELECT auth_name, code,
name, deprecated FROM projected_crs WHERE name LIKE
"%Virginia%South%"<br>
</div>
<div class="gmail_signature"
data-smartmail="gmail_signature">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?</div>
<div class="gmail_signature"
data-smartmail="gmail_signature"><br>
</div>
<div class="gmail_signature"
data-smartmail="gmail_signature">A more general question:
What does mean that a CRS is deprecated?</div>
<div class="gmail_signature"
data-smartmail="gmail_signature"><br>
</div>
<div class="gmail_signature"
data-smartmail="gmail_signature">Thanks<br>
</div>
<div dir="ltr" class="gmail_signature"
data-smartmail="gmail_signature">.___ ._ ..._ .. . ._.
.___ .. __ . _. . __.. ... .... ._ .__<br>
Entre dos pensamientos racionales <br>
hay infinitos pensamientos irracionales.<br>
<br>
</div>
</div>
</div>
</div>
<br>
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<pre class="moz-quote-pre" wrap="">_______________________________________________
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</pre>
</blockquote>
<pre class="moz-signature" cols="72">--
Nicolas Cadieux
<a class="moz-txt-link-freetext" href="https://gitlab.com/njacadieux">https://gitlab.com/njacadieux</a></pre>
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