I am trying to convert point data from EPSG:3080 to EPSG:4326 in PostGIS. When using ST_Transform(geom,4326) against a source column defined as 3080 I am getting incorrect results. If I use ST_Transform(geom,'proj4_text',4326) (where the proj4 specification for EPSG:3080 is directly from http://spatialreference.org/ref/epsg/3080/) it is giving proper answers. I looked at the definition for EPSG:3080 in the spatial_ref_sys table and it seems correct, although it is in WKT format rather than proj4). Clearly I'm misunderstanding or misusing something, but I'm unsure what that might be.

Problem was that I entered a (wrong) value and read it as being correct - at least a dozen times.

ST_Transform works just fine.

closed as off-topic by Ian Turton Jun 12 '17 at 15:08

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There is also field named proj4text in PostGIS. This query

select proj4text from spatial_ref_sys where srid=3080;

gives me this

+proj=lcc +lat_1=27.41666666666667 +lat_2=34.91666666666666 +lat_0=31.16666666666667 +lon_0=-100 +x_0=914400 +y_0=914400 +datum=NAD27 +units=ft +no_defs

while your link shows another string

+proj=lcc +lat_1=27.41666666666667 +lat_2=34.91666666666666 +lat_0=31.16666666666667 +lon_0=-100 +x_0=914400 +y_0=914400 +ellps=clrk66 +datum=NAD27 +to_meter=0.3048 +no_defs 

I can't say which one is correct and on what basis.

  • Another reason why spatialreference.org is out of date, while epsg.io/3080 is the same as PostGIS, and presumably correct. – Mike T Jun 14 '17 at 2:49

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