It should be, our spatial_ref_sys is generated from gdal which
generates from epsg. You have a pretty recent postgis, so I'm
surprised it's missing.
P
On Tue, Aug 17, 2010 at 1:57 AM, Erik Rehn wrote:
> Thank you guys! You were right, I had flipped the coordinates in the test I
> made.
>
> But th
Thank you guys! You were right, I had flipped the coordinates in the
test I made.
But that didn't explain the error I got in the KML. The solution to that
was to add "+towgs84=414.1,41.3,603.1,-0.855,2.141,-7.023,0" to the
spatial_ref_sys table for srid 3021. Why isn't that in there by default?
very nice explanation Mike
On Thu, Aug 12, 2010 at 11:39 AM, Mike Toews wrote:
> Hi,
>
> Your coordinates may be flipped. Was it 59N 18E? If so, use x,y
> notation: 'POINT(18 59)', which results in 'POINT(18.6
> 58.99905)', which is close enough.
>
> Also keep in mind that yo
Hi,
Your coordinates may be flipped. Was it 59N 18E? If so, use x,y
notation: 'POINT(18 59)', which results in 'POINT(18.6
58.99905)', which is close enough.
Also keep in mind that you are outside the projection bounds:
http://spatialreference.org/ref/epsg/3021/ (just a bit to
I think that is because many projections can indeed not be reversed, i.e.
the math is sometimes not straight formulas but iterative approximations and
you'll get rounding errors, etcetera...
--
Barend Köbben
Senior Lecturer
ITC University of Twente, Faculty of Geo-Information Science and
Earth
Removing the EPSG lookup from the equation changes nothing:
echo "59 21" | proj +proj=tmerc +lat_0=0 +lon_0=15.808278 +k=1
+x_0=150 +y_0=0 +ellps=bessel +units=m +no_defs | invproj
+proj=tmerc +lat_0=0 +lon_0=15.808278 +k=1 +x_0=150 +y_0=0
+ellps=bessel +units=m +no_defs
5
Seems to be an underlying problem with proj4:
echo "59 21" | proj "+init=epsg:3021" | invproj "+init=epsg:3021"
58d49'47.733"E 21d2'54.745"N
And that's without doing the datum shift part.
P
On Wed, Aug 11, 2010 at 1:10 PM, Erik Rehn wrote:
> Hello Postgis Users!
>
> This is my first post on
Hello Postgis Users!
This is my first post on this list so I will start by asking
a simple (and probably stupid) question. :)
While using ST_AsKml() to produce an overlay for Google Earth I
noticed that all my geometries where shifted slightly south-east.
I figured this had something to do with
