3

I have a shapefile. The coordinates (Lat/Long) are projected as meter (555000, 155000). But, I want to re-project it to decimal degrees(51.523666, -0.07467).

How can I do it with QGIS?

6

In QGIS, it's very straightforward. First, ensure that you have the correct coordinate system for your original shapefile:

  1. Add the layer to the map canvas;
  2. Right-click on the layer and select "Set layer CRS";
  3. Choose the correct coordinate reference system (CRS) from the list - it is probably in UTM (a metric grid) and you will have to know the zone and datum for the data; it may be already automatically selected!

After this:

  1. You right-click on the layer and select "Save as ...":
  2. Click 'Browse' near CRS in the resulting dialog and select WGS84 EPSG:4326 as the CRS for the new file - this will save it with decimal degrees as the coordinate system.

It's a very good idea to make sure you select a good name in the "Save as" dialog - appending the coordinate system to the name can be very helpful, e.g. my_shape_file_DD_WGS84 to remember that it's in degrees, WGS84.

0

I would just add as a step 3:

3) Once the layer is re-projected in WGS84 ESPG:4326, go to Vector > Geometry Tools > Add Geometry Attributes (Calculate Using Layer CRS)

  • This will add an X_Field and Y_Field attribute column to your attribute table, that displays the coordinates in decimal degrees

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.