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Compound SRS does not create a correct wkt output #282

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jessyst opened this issue Jan 23, 2018 · 3 comments · May be fixed by proj4js/wkt-parser#16
Open

Compound SRS does not create a correct wkt output #282

jessyst opened this issue Jan 23, 2018 · 3 comments · May be fixed by proj4js/wkt-parser#16

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@jessyst
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jessyst commented Jan 23, 2018

I am using the EPSG:7514 projection which is a compound projection. When trying to get this projection it creates a cleanWKT but with no projName. I think this is due to the nested Projection. Therefore the projection fails.

Do you have a solution for this?

REPRODUCE
proj4('COMPD_CS["Amersfoort / RD New + NAP",PROJCS["Amersfoort / RD New",GEOGCS["Amersfoort",DATUM["D_Amersfoort",SPHEROID["Bessel_1841",6377397.155,299.1528128]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.017453292519943295]],PROJECTION["Oblique Stereographic"],PARAMETER["central_meridian",5.387638888888891],PARAMETER["latitude_of_origin",52.15616055555556],PARAMETER["scale_factor",0.9999079],PARAMETER["false_easting",155000.0],PARAMETER["false_northing",463000.0],UNIT["m",1.0]],VERT_CS["Normaal Amsterdams Peil",VERT_DATUM["Normaal Amsterdams Peil",2005],UNIT["m",1.0]]]')
@calvinmetcalf
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we don't currently support compound projections, that being said, is that even the correct projection? http://epsg.io/7514 looks completely different

@jessyst
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jessyst commented Jan 23, 2018

oops I mean 7415 Typo!

This was referenced Feb 24, 2020
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@luipir
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luipir commented Feb 26, 2020

as far I can see there are two problems:

  1. COMPD_CS are not supporte from the geodesic point of view
  2. if someone want to get rid of the vertical part have error parsing the wkt string. A temporary workaround is to parte the WKT, get the horizontal SRS and define proj basing on this. but wkt-parser module have error parsing it not considering "_" char as possible element of the keywords.

Fixing the parse would be enough to extract horizontal SRS and use it to create proj4 string

@luipir luipir linked a pull request Feb 26, 2020 that will close this issue
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Allow COMPD_CS parsing stripping it luipir/wkt-parser
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@calvinmetcalf @luipir @jessyst