Opened 8 years ago

Closed 8 years ago

Last modified 8 years ago

#3487 closed defect (invalid)

wrong proj4text for epsg 31467

Reported by: klemensp Owned by: pramsey
Priority: critical Milestone: PostGIS 2.2.2
Component: postgis Version: 2.2.x
Keywords: proj4text Cc: spruk.klemen@…


In table spatial_ref_sys for srid 31674 srtext and proj4text do not match.

Proj4text has different ellipsoid than srtext definition.

Check register.

Change History (2)

comment:1 by pramsey, 8 years ago

Resolution: invalid
Status: newclosed

In spatial_ref_sys, the definition is

+proj=tmerc +lat_0=0 +lon_0=9 +k=1 +x_0=3500000 +y_0=0 +datum=potsdam +units=m +no_defs

The "datum" parameter embeds an implicit ellipse, whereas the representation uses an explicit ellipse. Here's the code from proj.4 defining the "potsdam" datum

"potsdam",  "towgs84=598.1,73.7,418.2,0.202,0.045,-2.455,6.7",  "bessel",  "Potsdam Rauenberg 1950 DHDN",

This looks the same as what is using. Having an explicit datum allows proj.4 to apply datum shift grids, where they exist, so this representation is preferable.

comment:2 by klemensp, 8 years ago


Thanks for explanation!


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