When working with spatial data, it is important that a CRS is assigned to the data and the QGIS project. To view the CRS for the QGIS project, click on Project Properties under Project and choose the CRS tab.
It is recommended that all data added to a QGIS project be projected into the same CRS as the QGIS project. However, if this is not possible or convenient, QGIS can project layers on the fly to the project's CRS.
If you want to quickly search for a CRS, you can enter the EPSG code to quickly filter through the CRS list. An EPSG code refers to a specific CRS stored in the EPSG Geodetic Parameter Dataset online registry which contains numerous global, regional, and local CRS. An example of a commonly used EPSG code is 4326
, which refers to WGS 84. The EPSG online registry is available at http://www.epsg-registry.org/.
To enable on-the-fly projection, perform the following steps:
To view the CRS for a layer, perform the following steps:
To project a layer to a different CRS, perform the following steps:
To create a new CRS or modify an existing CRS, perform the following steps:
PROJ.4 is another OSGeo (http://osgeo.org) project used by QGIS, and it is similar to OGR and GDAL. This project is for managing coordinate systems and projections. For a detailed user manual for the PROJ.4 format used to specify the CRS parameters in QGIS, download it from ftp://ftp.remotesensing.org/proj/OF90-284.pdf.
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