[Qgis-user] Trouble projecting on the fly
Sharon Selvaggio
ssitalian at comcast.net
Fri Feb 27 11:52:54 PST 2015
Thanks to all for your help. I finally decided to find another source
for my Oregon boundary and yahoo! Everything started lining up. So I
was able to make some real progress. I am DELETING that other
shapefile, and my guess, based on the help I received from all of you,
is that the projection file had errors in it.
Thank you!
On 02/27/2015 04:24 AM, Nicolas Cadieux wrote:
>
> 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] " <[hidden
> email] </user/SendEmail.jtp?type=node&node=5190455&i=0>> 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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