[Qgis-user] Trouble projecting on the fly

[Nicolas Cadieux]

Hi, 
Qgis can handle both projected and geographic CRS at the same time.  If it is a Custom CRS, it could means the projection was not recognized by a software along its production line and could indicate a problem if it contains errors... Or someone tried to recreate a missing CRS. 
Try to go back in the metadata if you have it in order to find more info like the EPSG code.  Perhaps it could help you identify the problem.  Try comparing the .prj file from two file that are supposed to be in the same CRS. Maybe that could help.  
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 
Le 2015-02-26 23:55, "Sharon Selvaggio [via OSGeo.org]	" <ml-node+s1560n5190392h13 at n6.nabble.com> a écrit : 

	
  
    
  
  
    Still struggling.... I am attaching the info from the prj file and
    the extent info from the metadata for each shapefile: 
    
    I noticed that the PROJCS is labeled as "Custom"...could that be
    confusing QGIS? 
    
    Or is it because one is a projected CRS and one is a geographic CRS? 
    
    or_state_boundary.prj 
    PROJCS["Custom", 
    GEOGCS["GCS_North_American_1983", 
    DATUM["D_North_American_1983", 
    SPHEROID["GRS_1980",6378137.0,298.257222101]], 
    PRIMEM["Greenwich",0.0], 
    UNIT["Degree",0.0174532925199433]], 
    PROJECTION["Lambert_Conformal_Conic"], 
    PARAMETER["False_Easting",1312335.958], 
    PARAMETER["False_Northing",0.0], 
    PARAMETER["Central_Meridian",-120.5], 
    PARAMETER["Standard_Parallel_1",43.0], 
    PARAMETER["Standard_Parallel_2",45.5], 
    PARAMETER["Central_Parallel",41.75], 
    UNIT["Foot",0.3048]] 
    
    
    xMin,yMin
        183871.74,88600.9 : xMax,yMax 2345213.24,1675042.97 
    
    
    
    CKUWR.prj 
    GEOGCS["GCS_North_American_1983", 
    DATUM["D_North_American_1983", 
    SPHEROID["GRS_1980",6378137.0,298.257222101]], 
    PRIMEM["Greenwich",0.0], 
    UNIT["Degree",0.0174532925199433]] 
    
    
    xMin,yMin
        -123.522,43.356 : xMax,yMax -121.714,45.4562 
      
    
      
    Help
        very much appreciated. 
      
    
    
    
    On 02/24/2015 07:26 AM, Andre Joost
      wrote: 
    
    Am
      24.02.2015 um 07:55 schrieb Ramon Andiñach:
      
      
      
        On 24 Feb 2015, at 14:06, Sharon
          Selvaggio
          
          
          I start by setting my project CRS.
          
        
        
        And make sure OTF is on.
        
      
      
      You have no choice of setting a project CRS if OTF is off.
      
      
      
        
        But when I do this with files that have
          originated from two
          
          different sources with different native projections (or no
          
          projection?) they still do not align.
          
        
        
        Different sources or different layer CRS shouldn't matter.
        
      
      
      Shapefiles without .prj file are still existing in the world.
      
      
      
      
        
        There is an option mentioned previously so that you can set how
        QGIS
        
        handles layers that it can't tell what the CRS is.
        
      
      
      Settings -> Options, CRS Tab, CRS foor new layers.
      
      
      
        
        If you can point us at the files you're using - or excerpts from
        them
        
        - then we might be able to understand where the problem is
        better.
        
      
      
      Or tell us the extent of every layer, as reported by Rightclick
      -> Properties, metadata tab.
      
      
      
      1. On a side note. Do not use the Google
        maps/satellite images to
        
        check if your layers are in the right place unless you
        understand the
        
        gotchas in using that service.
        
        
      
      
      I don't agree with that.
      
      If some layers come up on the wrong part of the Earth, it is a
      good reference to see which layers are right and which are wrong.
      
      
      Natural Earth shapefiles can be a reference as well.
      
      
      Greetings,
      
      André Joost
      
      
      
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