[OpenLayers-Dev] OpenLayers 6 and only WGS 84 API with Polar coordinate systems

[Mihkel Oviir]

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 (<andreas.hocevar at gmail.com>) 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) <
> jukka.rahkonen at maanmittauslaitos.fi> 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 <andreas.hocevar at gmail.com>
>> *Lähetetty:* perjantai 6. syyskuuta 2019 0.32
>> *Vastaanottaja:* Rahkonen Jukka (MML) <
>> jukka.rahkonen at maanmittauslaitos.fi>
>> *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) <
>> jukka.rahkonen at maanmittauslaitos.fi> 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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