[Qgis-user] WMS Image Projection

[Springfield Harrison]

Hi Andreas,

Thanks for the reply, I'll try to clarify:

 1. Version is 3.16.4
 2. The two municipal sources are being viewed in their own web windows
    and are displaying the same data
     1. They are the source of the property lines for my GIS (downloaded
        shapefile) and the orthophoto (WMS link, not resident TIFF or other)
 3. The property lines are EPSG:3157 - NAD83(CSRS) / UTM zone 10N -
    Projected, and from the municipal source.  I've attached the
    shapefile if you have the time.
 4. In QGIS, the ortho is loaded from the WMS source
     1. https://mapservices.crd.bc.ca/arcgis/services/OrthoImagery2019/MapServer/WMSserver
     2. EPSG:26910 - NAD83 / UTM zone 10N - Projected
 5. The project CRS is EPSG: 26910 but it doesn't seem to change
    anything by changing that or the source projections (at least within
    versions of NAD83 UTM Zone 10N)
 6. Thus, the same information displays differently online /versus/ in QGIS.
     1. The shift seems to be 1.5 m +/-, quite a lot for what I'm trying
        to do (building permit with tight setbacks).
     2. These are commonly used projections for our neck of the woods
     3. The two images I sent earlier depict the differences; in QGIS,
        earlier orthophotos show a similar or worse displacement. Not so
        on the municipal web viewer.
 7. I've read up on projections in the tutorial and Help file, no
    revelations there, at least that I could see.

Thanks very much for any thoughts you may have.

-----
Cheers, Spring



On 08/Apr/2021 00:47, Andreas Neumann wrote:
>
> Hi,
>
> Are there two different CRS involved here? Are the vectors (parcel 
> boundaries) in a different CRS than the orthoimages? This might be a 
> problem of a missing grid-shift file in QGIS.
>
> It is also unclear for me if you load your Orthoimages locally (from 
> tiff-files as well) or from WMS (or both) and only one of them is shifted?
>
> Can you also add information what QGIS version with what proj version 
> you use? You can find this information in the about dialogue in the 
> help menu.
>
> Greetings,
>
> Andreas
>
> On 2021-04-08 02:37, Springfield Harrison wrote:
>
>> Hello All,
>>
>> Re obtaining orthophotos from a WMS server.
>>
>> Locally we have orthophotos that can be brought into QGIS using the 
>> WMS service.  They are also viewable on the local government web map 
>> service.  In both cases I can compare them to the property lines 
>> which are from the same source.
>>
>> On the government web pages (2), the orthophotos and the lot lines 
>> appear to coincide very well.  In QGIS, the same two layers are quite 
>> misaligned.
>>
>> One would suspect a CRS problem but changing the CRS of the Project 
>> and the WMS image in QGIS has no effect.  Even followed the tutorial 
>> to no effect.
>>
>> I'm attaching screen shots of the two results.  Ant thoughts would be 
>> appreciated, thank you . . . .
>>
>> -----
>> Cheers, Springfield Harrison
>>
>>
>>
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