[Qgis-user] How to specify a local coordinate system

[MacQueen, Don]

I'm using QGIS to display drawings that come from CAD files (dxf). They
are in a local cartesian coordinate system with a local origin, not
related to any coordinate system known to PROJ4.

How should I specify the coordinate system when I read the dxf file into
QGIS (using "Add Vector Layer")?

I suppose I'm looking for something analogous to what GRASS happens in
GRASS, in the "Define new GRASS Location" wizard, with the "Create an
arbitrary non-earth coordinate system (XY)" option.

Thanks
-Don

[Nick Hopton]

If you're not bothered about your data mapping properly onto the 'real world'
you could use any projected CRS (projected, not lat/lon). All CRS's are just
simple xy grids, you could use my local one, EPSG:27700.

Better though to transform (affine) your data to an appropriate CRS.

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[Goyo]

Post by MacQueen, Don
I'm using QGIS to display drawings that come from CAD files (dxf). They
are in a local cartesian coordinate system with a local origin, not
related to any coordinate system known to PROJ4.
How should I specify the coordinate system when I read the dxf file into
QGIS (using "Add Vector Layer")?

If you know how to describe your CRS using PROJ4 parameters, create a
custom CRS (Configuration > Custom CRS) and then assign it to your
layers.

Goyo

[Jake Maier]

I just got so annoyed by another crash on windows (annoyed by the recovery process) that I decided what I should have done a long time ago.
I switched to Ubuntu 12.04. So I'm very new to the operating system but really like what I see so far. Now I need to get qgis to Ubuntu 12.04. How do I do this with the least amount of pain :)
Thanks for any pointers.
Jake

[Salvatore Larosa]

Post by Jake Maier
I just got so annoyed by another crash on windows (annoyed by the recovery process) that I decided what I should have done a long time ago.
I switched to Ubuntu 12.04. So I'm very new to the operating system but really like what I see so far. Now I need to get qgis to Ubuntu 12.04. How do I do this with the least amount of pain :)
Thanks for any pointers.
Jake

http://hub.qgis.org/projects/quantum-gis/wiki/Download#Ubuntu

Regards,

-SL

[Lee Hachadoorian]

Post by Salvatore Larosa

Post by Jake Maier
I just got so annoyed by another crash on windows (annoyed by the recovery process) that I decided what I should have done a long time ago.
I switched to Ubuntu 12.04. So I'm very new to the operating system but really like what I see so far. Now I need to get qgis to Ubuntu 12.04. How do I do this with the least amount of pain :)
Thanks for any pointers.
Jake

http://hub.qgis.org/projects/quantum-gis/wiki/Download#Ubuntu
Regards,
-SL

Jake,

The above instructions might not be clear if you're new to Ubuntu. Basic
procedure is (1) add a repository or PPA (personal packages archive) to
your software sources, (2) install package via package manager. Step 0
is choosing a software source. Options include qgis.org,
ubuntugis-stable, and ubuntugis-unstable.

I would recommend ubuntugis-unstable, which, in spite of the name, is
pretty stable, and has a host of other useful GIS software that you
might want to explore.
https://launchpad.net/~ubuntugis/+archive/ubuntugis-unstable
<https://launchpad.net/%7Eubuntugis/+archive/ubuntugis-unstable> has
information about what packages are available, as well as very clear
instructions on how to add the PPA to your software sources. More
information on the UbuntuGIS project is available at
https://wiki.ubuntu.com/UbuntuGIS.

Welcome to Ubuntu!

--Lee