Tell me more ×
Geographic Information Systems Stack Exchange is a question and answer site for cartographers, geographers and GIS professionals. It's 100% free, no registration required.
up vote 2 down vote favorite

Suppose I have layers A and B. I don't know their projections but by the looks of the map I know they are not the same.

In QGIS 1.6 I would use one of my favorite features:

Vector> Data Management Tools> Export to New Projection

What was nice about that feature is that you could export B to A's projection by selecting "choose projection from existing layer". Hence you need not know A or B's projection.

In QGIS 1.7 the Data management Tools menu is much reduced and the Export to New Projection is missing.

Yes, I can do projections on the fly, and I can do save as. The former is not useful if I want to convert B's projection to A's. The latter does not give option to set projection from open layer.

I have tried to find different ways to access the Export to New Projection dialog without success. Any tips?

share|improve this question
2  
"Export to New Projection" has been removed to decrease complexity and necessary maintenance for what was considered a duplicate of "Save as ...". If "choose projection from existing layer" is important to you, maybe file a feature request to add it to "Save as ...". – underdark♦ Jul 1 '11 at 17:02
1  
@underdark I can see the need to simplify but I think this was a useful feature. I will try to add a feature request. Right now I fallen back to using QGIS 1.6 for this task. – Fred Jul 1 '11 at 19:33
1  
IMHO there is no point in saving a file in a projection that you don't know. – Pablo Jul 1 '11 at 20:05
@Pablo Please see my comment to your answer below. – Fred Jul 1 '11 at 20:51
@Pablo The point is to make them align in some projection so the layer can be saved and read in R. For my purposes I do not care about the projection so long as they are aligned. There is a reason I asked the question I asked. – Fred Jul 1 '11 at 20:55
show 1 more comment

3 Answers

up vote 1 down vote accepted

On the basis of answers and responses, I would say the right answer is that provided by underdark:

"Export to New Projection" has been removed to decrease complexity and necessary maintenance for what was considered a duplicate of "Save as ...". If "choose projection from existing layer" is important to you, maybe file a feature request to add it to "Save as ...".

In short, this is no longer possible in QGIS 1.7.

Instead, one would need to:

  1. Find out all your layers' projections and use save as or;
  2. Find out all your layers' projections, learn ogr2ogr, and write a script to export layers or ;
  3. Use QGIS 1.6 to export the layer and then open in QGIS 1.7.

Given that I am no expert in GIS I would choose option 3. (I guess that counts as a minus for QGIS 1.7)

share|improve this answer
up vote 0 down vote

Since there is no "choose projection from existing layer" you will need to know layer A projection.

1) Find layer A projection. 2) Save As... (layer B) 3) Choose the SRS, after the first use it should be avaliable in "Recently used".

For that you need 5 clicks.

share|improve this answer
1  
Thanks. In QGIS 1.6 is 3 clicks and no need to spend time finding projection. My layer A is "nominally" in Lambert Conformal Conic with datum ITRF92 which is not even in the CRS menu (though almost identical to WGS1984). My layer B is from a Garmin eTrex where the datum had been set to WGS1984. When I load both layers they do not overlay at all. BTAIM the point is that in QGIS1.6 I solved this in three clicks and in QGIS1.7 I had to come here, ask questions, and get smart responses. – Fred Jul 1 '11 at 20:49
up vote 0 down vote

Why don't you have 'Enable 'on the fly' reprojection by default' on? As you don't care for the projection, just set it as WGS84.

The only problem with on-the-fly projections is that many tools (like Vector->Research Tools->Select by Location) won't work.

share|improve this answer

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

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