The Coordinate Systems Updater

Version 0.2.3
Created by: Diethard Jansen
Started: 11 July 2011
This release: 22 April 2012

General

The Coordinate Systems Updater is a plugin that adds functionality to Quantum GIS and can be used to improve several coordinate system references delivered with quantum GIS install from simple interface.

I created this plugin, because I could first not properly combine WGS84 data (EPSG:4236) with the Dutch proj4 parameters provided for EPSG:28992. Which means that my GPS data was projected often more than 100 meters from the place where I expected the data to show up. Improving the parameter a bit and now they do fall nicely together. I wanted to share this with all users of Quantum GIS

Actually you need to use this plugin only once for each installation of quantum gis and then you can remove this plugin.

Because this plugin changes originals setting of an installed QGIS product I decided to store the original settings before an update takes place. You can allways restore to the original values when you are not happy with the new settings.

Usage

This video on Youtube shows the use of the plugin:
The QGIS Coordinate Systems Updater

First have a look in the list of coordinate systems provided. If the coordinate system you want to improve is available in the list, look at the colour it is provided in:

  1. blue          : This coordinate system can be updated
  2. light-green: This coordinate system does not need an update!
  3. dark-green: This coordinate system has been updated and can be restored to origal value when neccesary
  4. red          : This coordinate system is not avaible in the coordinate system reference database provided with this version of Quantum Gis and can therefore not be updated!

When the coordinate system you need is not available in the list but you now there is a better Proj4 definition, let me know the proj4 definition and I will add it the list and provide an update of the plugin as soon as possible!

The choice list behind the Update or Restore buttons, provides you with two choices: All (default) and Selected.

If you selected the option All it will do the action Update or Restore for all items in the list when appropriate.
If you have selected the option Selected it will do the action Update or Restore for all selected items in the list when appropriate.
Update will update all listed blue items and Restore wil restore all listed dark green items.

Solve Authorisation problems

To make the database srs.db writable from plugin in ubuntu you need to change the authorisation of folder and file.
To do this you will need to have system administrator rights.

For OSX and Linux!

When you give a command starting with sudo, the first time you will be prompted to enter the password of the system administrator.
Often you are allready the system administrator and you can give the same password that you use to login.

In Linux environment (Ubuntu)

Please open terminal window and give following statements:

cd /usr/share/qgis
sudo chmod 777 resources
cd resources
sudo chmod 666 srs.db

In OSX environment (Mac)

Please open terminal window and give following statements:

cd /Applications/QGIS.app/Contents/Resources
sudo chmod 777 resources
cd resources
sudo chmod 666 srs.db

In Windows environment

Open windows explorer, go to Quantum GIS product under C:\program files.
open \apps\qgis folder in this folder.
Select folder resources and rightclick to access properties.
update authorisation so all users have write access to folder resources.

Copyright/License agreement

(C) 2011 by Diethard Jansen
Email address: Diethard.Jansen at gmail.com (replace at with @)

This Program is Free Software;
GNU General Public License version 3 applies to this code.

This basically means you can change and use this code however it seems fit to you. However you are not able to sue me when damaged is caused by whatsoever using this code. When you publish code (partly) based on this code you have to use the same License!