[Qgis-user] Calculating Area. differences when transformation on the fly on / off

[Nicolas Cadieux]

Hi, 
To make sure you don't get mistakes, it is best to have the project CRS and layer CRS the same.  
As your project CRS is in meters, the results are in meter on that reprojected file. Some tool work exclusively with the layer CRS while some tool can work with reprojected files. 
In your case, when on the fly is off, the tools uses the layer unit.  When on the fly is on, the layer is reprojected and the tool used the project CRS. 
Nicolas Cadieux M.Sc. 
Les Entreprises Archéotec inc.  
8548, rue Saint-Denis Montréal H2P 2H2 
Téléphone: 514.381.5112  Fax: 514.381.4995 
www.archeotec.ca 
On Jan 26, 2016 11:51, "kmithoefer [via OSGeo.org]" <ml-node+s1560n5247360h21 at n6.nabble.com> wrote: 

	
  

    
  
  
    Dear all, 
      
      I calculate area values for counties in Alaska. The layer and the
      project is in EPSG:2964 - NAD27 / Alaska Albers. However, If I
      switch "transformation on the fly" on I get values in
      square-meters. If I switch it off I get squarefoot, which is
      correct because the unit for EPSG:2964
      - NAD27 / Alaska is Foot_US. 
      So where are the square meters based on and what drives the
      calculation, the layer CRS or the project CRS. 
      
      Thank you 
      Cheers 
    
      Klaus 
      
      -
    


			
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