Projection EPSG:4839 Issue

[Miroslav Sabo]

Dear MapStore Developers,

we have a problem with projection https://epsg.io/4839. 

It's defined in localConfig.json as follows: 

"projectionDefs": [{

    "code": "EPSG:4839",

    "def": "+proj=lcc +lat_1=48.66666666666666 +lat_2=53.66666666666666 +lat_0=51 +lon_0=10.5 +x_0=0 +y_0=0 +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs",

    "extent": [-2548168.31, -1577095.90, 447411.34, 4109159.94],

    "worldExtent": [-16.1, 32.88, 40.18, 84.17 ]

  }]

  .

  .

  .

  "desktop": [

  .

  .

  .

"name": "CRSSelector",

              "cfg": {

                "additionalCRS": {

"EPSG:4839": {

"label": "4839"

}

However, when we load the data from GeoServer via WMS service, data is not at the right coordinates and when we zoom-in/zoom-out the data is moved randomly. 

We suspect that WMS request parameters (BBOX, WIDTH, HEIGHT) may be incorrect.

Also, the 'Open Street Map' background seems to be displayed correctly, but the 'Sentinel 2 Cloudless' is incorrect (please see attached 'sentinell_2_cloudless.PNG)

Could you please advise us if we are doing something wrong? 

Is the definition of projection incorrectly defined? (We have set the properties from https://epsg.io/4839 as suggested here: https://mapstore.readthedocs.io/en/latest/developer-guide/local-config/#projectiondefs-configuration).

I have attached localConfig.json and map.json. 

Thanks for a response. 

Regards
Miroslav Sabo

[Mauro Bartolomeoli]

Good morning Miroslav,

I had a quick look at the EPSG:4839 definition here: https://epsg.io/4839

From the description, I understood axes are inverted (y, x) and this should explain your issues.

To fix it you should try to add +axis=neu to the proj4 definition, to take care of the axis inversion.

Let me know if this works for you.

Mauro

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Regards,

Mauro Bartolomeoli

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[Miroslav Sabo]

Hi Mauro, 

thank you very much for the response.
Your solution works great and the problem with the data displaying seems to be fixed with this modification of projection definition. 
However, the Open Street Map background has now inverted axis (please see osm.PNG). 

Is there any way that this can be fixed by modifying configuration? 

Regards,

Miroslav Sabo

[Mauro Bartolomeoli]

Hi Miroslav,

I believe this is "expected". At least, mouse coordinates are correctly aligned with the OSM map. Can you confirm that also the points rendered by your GeoServer and that I can see on the screenshot are in the right place?

Mauro

To view this discussion on the web, visit https://groups.google.com/d/msgid/mapstore-developers/0373f31b-20d5-4ece-b31c-768d307e62c7n%40googlegroups.com.

[Miroslav Sabo]

Yes, all points rendered by GeoServer are in the right place. 

This means that I would have to configure map so that this projection is not available for Open Street Map background? 
Is there any other solution possible? 

Thanks. 

Miroslav

[Mauro Bartolomeoli]

Hi Miroslav,

Il giorno lun 17 mag 2021 alle ore 12:17 Miroslav Sabo <smi...@gmail.com> ha scritto:

Yes, all points rendered by GeoServer are in the right place. 

This means that I would have to configure map so that this projection is not available for Open Street Map background? 
Is there any other solution possible? 

I did another test, setting axis direction as an openlayers property, instead of a proj4 one, with the following settings:

"projectionDefs": [{

      "code": "EPSG:4839",

      "def": "+proj=lcc +lat_1=48.66666666666666 +lat_2=53.66666666666666 +lat_0=51 +lon_0=10.5 +x_0=0 +y_0=0 +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs",

      "extent": [-2548168.31, -1577095.90, 447411.34, 4109159.94],

      "worldExtent": [-16.1, 32.88, 40.18, 84.17 ],

      "axisOrientation": "neu"

    }],

 

Let me know if this works better.

Mauro

[Miroslav Sabo]

Hi Mauro, 

This solution works great!
Thank you very much, you've been really helpful. 

Best Regards,

Miroslav Sabo