Bug report #247
custom projection definition
| Status: | Closed | ||
|---|---|---|---|
| Priority: | Low | ||
| Assignee: |  Tim Sutton | ||
| Category: | Build/Install | ||
| Affected QGIS version: | Regression?: | No | |
| Operating System: | Debian | Easy fix?: | No |
| Pull Request or Patch supplied: | Resolution: | fixed | |
| Crashes QGIS or corrupts data: | Copied to github as #: | 10306 |
Description
Hallo,
maybe i do something wrong, but:
I would like to define my custom projection "Krovak S-JTSK" with
following parameters:
Name: sjtsk
Parameters: +proj=krovak +ellps=bessel +no_defs +towgs84=570.8,85.7,462.8,4.998,1.587,5.261,3.56
It is not possible to add custom projection to QGIS. When I click on the
"Save" button, nothing is saved.
when I try to add just something common:
Name: myproj
Parameters: +proj=latlong +ellps=WGS84
It can not be saved either.
In sqlite:
sqlite> select * from vw_srs;
sqlite>
In the command line, only two lines appear:
QgsCustomProjectionDialog::getProjFromParameters()
QgsCustomProjectionDialog::getEllipseFromParameters()
And, I would say, the test does also not work, how expected:
I would say, that North and East are changed
and
when I try
Parameters: +proj=latlong +ellps=WGS84
North: 12
East: 24
the result is
0.2084
0.4189
is it wrong, that I'm expecting "12 14" ?
echo "12 24" |cs2cs +proj=latlong +to +proj=latlong +ellps=WGS84
12dE 24dN 0.000
??
short summary:
1) It is not possible to save custom projection
2) the "test" of custom projection does not work properly
qgis_unstable 0.8 fresh svn, build with dpkg-buildpackage on ubuntu 6.06
Thanks
Jachym
P.S. Problem confirmed on debian testing
History
#1
Updated by Gavin Macaulay - about 18 years ago
To make a new custom projection you first need to click on the 'new' button in the dialog box, then enter your projection parameters and name, then click on 'save'.
However, this is a bit counter-intuitive, especially when doing the first custom projection, so I've made a change so that if there are no custom projections the dialog automatically does a 'new' button click for you. This is available in SVN 7343b610 (SVN r5779).
#2
Updated by vslavik-fastmail-fm - about 18 years ago
I'm able to add the krovak projection as above now that I know how the 'new' button behaves, but the projection still does not show up in Settings -> Project Properties -> Projection -> User Defined Coordinate Systems. Other projections, e.g. the latlong one from above, do show up correctly.
I finally tracked this down to missing dvorak entery in the tbl_projection table. Adding the entry to ~/.qgis/qgis.db like this:
INSERT INTO "tbl_projection" VALUES('krovak', 'S-JTSK / Krovak', _, _);
fixed the problem, but I have no idea whether the line is correct or not (I'm new to GIS and hit the problem when following instructions on setting QGIS up for Czech users).
#3
Updated by Gavin Macaulay - about 18 years ago
The reversed north/east problem appears to be fixed in svn c9b3a3a6 (SVN r5936). That just leaves the missing entry in the tbl_projection table mentioned above.
#4
Updated by Gavin Macaulay - about 18 years ago
- Resolution set to fixed
- Status changed from Open to Closed
Fixed in SVN 333f9793 (SVN r5944) - the krovak projection was missing from the qgis.db database (but was in the srs.db database)
#5 Updated by Anonymous over 15 years ago
Milestone Version 0.8 deleted