OpenLayers 6 and only WGS 84 API with Polar coordinate systems

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OpenLayers 6 and only WGS 84 API with Polar coordinate systems

jratike80

Hi,

 

I followed the recording from FOSS4G 2019 about the new features in OL 6 https://media.ccc.de/v/bucharest-337-openlayers-6-there-and-back-again. At time 16:35 there is a slide that states “Use only geographic coordinates (WGS 84) in the API”. I wonder if such change would make it difficult to work with the Polar coordinate systems like those used in the Arctic SDI geoportal https://geoportal.arctic-sdi.org/ (press the World icon under the scale slider for selecting your favourite). Do we need to be worried?

 

Jukka Rahkonen

National Land Survey of Finland

 


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Re: OpenLayers 6 and only WGS 84 API with Polar coordinate systems

jratike80

Hi,

 

My concern was if the accuracy of conversions is good enough in WGS 84 system because one meter jumps around the North pole have quite big effect on Lon coordinates and quite small effect on Lat coordinates.

 

gdaltransform -s_srs epsg:3574 -t_srs epsg:4326

0 0

-40 90 0

0 1

140 89.9999910451167 0

0 -1

-40 89.9999910451167 0

0 -2

-40 89.9999820902333 0

1 -2

-13.434948822922 89.9999799762722 0

 

-Jukka-

 

 

Lähettäjä: Andreas Hocevar <[hidden email]>
Lähetetty: perjantai 6. syyskuuta 2019 0.32
Vastaanottaja: Rahkonen Jukka (MML) <[hidden email]>
Aihe: Re: [OpenLayers-Dev] OpenLayers 6 and only WGS 84 API with Polar coordinate systems

 

Hey,

 

nothing to be worried about. We’re only adding convenience, not removing any features regarding projections.

 

Andreas.

On Thursday, September 5, 2019, Rahkonen Jukka (MML) <[hidden email]> wrote:

Hi,

 

I followed the recording from FOSS4G 2019 about the new features in OL 6 https://media.ccc.de/v/bucharest-337-openlayers-6-there-and-back-again. At time 16:35 there is a slide that states “Use only geographic coordinates (WGS 84) in the API”. I wonder if such change would make it difficult to work with the Polar coordinate systems like those used in the Arctic SDI geoportal https://geoportal.arctic-sdi.org/ (press the World icon under the scale slider for selecting your favourite). Do we need to be worried?

 

Jukka Rahkonen

National Land Survey of Finland

 


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Re: OpenLayers 6 and only WGS 84 API with Polar coordinate systems

Andreas Hocevar
There will be a way to configure things so coordinates are not transformed inside OpenLayers. This will allow you to continue working with your local projection without any conversion loss.

Andreas.

On Friday, September 6, 2019, Rahkonen Jukka (MML) <[hidden email]> wrote:

Hi,

 

My concern was if the accuracy of conversions is good enough in WGS 84 system because one meter jumps around the North pole have quite big effect on Lon coordinates and quite small effect on Lat coordinates.

 

gdaltransform -s_srs epsg:3574 -t_srs epsg:4326

0 0

-40 90 0

0 1

140 89.9999910451167 0

0 -1

-40 89.9999910451167 0

0 -2

-40 89.9999820902333 0

1 -2

-13.434948822922 89.9999799762722 0

 

-Jukka-

 

 

Lähettäjä: Andreas Hocevar <[hidden email]>
Lähetetty: perjantai 6. syyskuuta 2019 0.32
Vastaanottaja: Rahkonen Jukka (MML) <[hidden email]>
Aihe: Re: [OpenLayers-Dev] OpenLayers 6 and only WGS 84 API with Polar coordinate systems

 

Hey,

 

nothing to be worried about. We’re only adding convenience, not removing any features regarding projections.

 

Andreas.

On Thursday, September 5, 2019, Rahkonen Jukka (MML) <[hidden email]> wrote:

Hi,

 

I followed the recording from FOSS4G 2019 about the new features in OL 6 https://media.ccc.de/v/bucharest-337-openlayers-6-there-and-back-again. At time 16:35 there is a slide that states “Use only geographic coordinates (WGS 84) in the API”. I wonder if such change would make it difficult to work with the Polar coordinate systems like those used in the Arctic SDI geoportal https://geoportal.arctic-sdi.org/ (press the World icon under the scale slider for selecting your favourite). Do we need to be worried?

 

Jukka Rahkonen

National Land Survey of Finland

 


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Re: OpenLayers 6 and only WGS 84 API with Polar coordinate systems

mihkelo
Yeah, this shoud be obvious, as there is colorful world outside of web-mercator. There is no point to recreate Leaflet. Many usecases uses national basemap in national coordinate system and all raster and vector overlays are also in national coordinate system. These use cases live in they own EPSG:CODE, so all input coordinates should be also on that. But as default coordinate system is web-mercator, which is not used outside of tiling (at all), it is reasonable, that data is assumed on wgs.

Kontakt Andreas Hocevar (<[hidden email]>) kirjutas kuupäeval R, 6. september 2019 kell 09:33:
There will be a way to configure things so coordinates are not transformed inside OpenLayers. This will allow you to continue working with your local projection without any conversion loss.

Andreas.

On Friday, September 6, 2019, Rahkonen Jukka (MML) <[hidden email]> wrote:

Hi,

 

My concern was if the accuracy of conversions is good enough in WGS 84 system because one meter jumps around the North pole have quite big effect on Lon coordinates and quite small effect on Lat coordinates.

 

gdaltransform -s_srs epsg:3574 -t_srs epsg:4326

0 0

-40 90 0

0 1

140 89.9999910451167 0

0 -1

-40 89.9999910451167 0

0 -2

-40 89.9999820902333 0

1 -2

-13.434948822922 89.9999799762722 0

 

-Jukka-

 

 

Lähettäjä: Andreas Hocevar <[hidden email]>
Lähetetty: perjantai 6. syyskuuta 2019 0.32
Vastaanottaja: Rahkonen Jukka (MML) <[hidden email]>
Aihe: Re: [OpenLayers-Dev] OpenLayers 6 and only WGS 84 API with Polar coordinate systems

 

Hey,

 

nothing to be worried about. We’re only adding convenience, not removing any features regarding projections.

 

Andreas.

On Thursday, September 5, 2019, Rahkonen Jukka (MML) <[hidden email]> wrote:

Hi,

 

I followed the recording from FOSS4G 2019 about the new features in OL 6 https://media.ccc.de/v/bucharest-337-openlayers-6-there-and-back-again. At time 16:35 there is a slide that states “Use only geographic coordinates (WGS 84) in the API”. I wonder if such change would make it difficult to work with the Polar coordinate systems like those used in the Arctic SDI geoportal https://geoportal.arctic-sdi.org/ (press the World icon under the scale slider for selecting your favourite). Do we need to be worried?

 

Jukka Rahkonen

National Land Survey of Finland

 

_______________________________________________
Dev mailing list
[hidden email]
https://lists.osgeo.org/mailman/listinfo/openlayers-dev

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[hidden email]
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