[Qgis-user] QGIS3 location error

[Adam Dershowitz]

I followed that thread, and it did provide a work around.  
For anyone else who runs into this...I just tried to create an identical CRS to the actual one, but without "+nadgrids=@null”.  I then set the source for my image to use that custom CRS and now it does display in the correct location.  

Thank you for pointing me in the right direction!  

--Adam



> On Mar 9, 2018, at 1:15 PM, Adam Dershowitz <dersh at alum.mit.edu> wrote:
> 
> It looks like currently Macports is using proj 5.0.0 so that is likely the problem.  Ugh.  
> 
> Thanks,
> 
> --Adam
> 
> 
> 
>> On Mar 9, 2018, at 1:07 PM, Richard Duivenvoorde <rdmailings at duif.net> wrote:
>> 
>> Which version of proj are you using? See the about box of QGIS.
>> 
>> If it is 500, you hit a proj issue, see this thread
>> https://lists.osgeo.org/pipermail/qgis-developer/2018-March/052501.html
>> (or in this list read msgs with subject "proj5 and epsg:3857")
>> 
>> If you have 49* it is another problem.
>> 
>> Regards,
>> 
>> Richard
>> 
>> 
>> 
>> 
>> On 09-03-18 18:47, Adam Dershowitz wrote:
>>> I have a project that I created and have worked with in QGIS2.  I just
>>> tried it in QGIS3, and one of the layers is showing in the wrong
>>> location.  In both cases they show a CRS definition of "+proj=merc
>>> +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0 +k=1.0
>>> +units=m +nadgrids=@null +wktext +no_defs"
>>> After doing some testing, and creating a new project, it seems that
>>> there is a single layer that is offset in QGIS3, from the correct
>>> location, by about 500m West and about 20,000m North.  
>>> 
>>> The layer is a JP2 imagery layer, that I downloaded from this link:
>>> https://www.sciencebase.gov/catalog/item/58281f9fe4b01fad870f045f
>>> 
>>> And, here is the information about it:
>>> https://www.sciencebase.gov/catalog/file/get/58281f9fe4b01fad870f045f?f=__disk__76%2F45%2F79%2F7645799634b35663c92271129192d7ff9c4204e0&transform=1&allowOpen=true
>>> <https://www.sciencebase.gov/catalog/file/get/58281f9fe4b01fad870f045f?f=__disk__76/45/79/7645799634b35663c92271129192d7ff9c4204e0&transform=1&allowOpen=true>
>>> 
>>> 
>>> As one example, if I use an NAD83 CRS, it shows up as being from
>>> approximately 36.12deg N to about 36.18deg N.  But, according to the
>>> link above, the actual bounding coordinates should be 35.9375 to 36.0000.  
>>> 
>>> Any idea why this won’t show up in the correct location, or what I can
>>> do about it?  
>>> 
>>> I’m using qgis 3.0.0_1 on a Mac that I installed using Macports.
>>> 
>>> Thanks,
>>> 
>>> 
>>> --Adam
>>> 
>>> 
>>> 
>>> 
>>> 
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>> 
> 
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