Open MattF-NSIDC opened 10 months ago
Greenland: NSIDC has apparently varied polar stereo projections, https://nsidc.org/data/user-resources/help-center/guide-nsidcs-polar-stereographic-projection, to investigate and decide when time (not urgent)
South America: It might be necessary to split in 2 projections:
Argentina-Chile and the north of South America.
Right now, I propose to do it in web mercator as for US and HMA, and we could change before launch
For Alaska, EPSG:3978 would work, but is there any basemap available? I will temporarily also generate the geojson in EPSG:3857 and we'll be able to shift once the basemaps will be found.
I found a post from 2018 referencing this basemap provided by Natural Resources Canada:
https://geoappext.nrcan.gc.ca/arcgis/rest/services/BaseMaps/CBMT3978/MapServer/tile/{z}/{y}/{x}
But the basemaps from that server are returning errors today. I think it might be useful to search specifically for services provided by the Canadian government or NGOs. Perhaps site:*.ca
will help find those results?
Yes, I was thinking something similar. I'll do some more digging on that.
Doesn't the USGS have anything for at least Alaska? (Canada has a lower priority I think)
The USGS ones for Alaska seem to be in Web mercator. But I'm still looking.
Here are some things I found: https://docs.google.com/document/d/1PUZ54NieWbK9RU-dY0VCkMQUUnQClUKazaPiANa3V0I/edit
Today at standup we decided we will discuss with Karl the idea of using Web Mercator everywhere; finding basemaps in other projections from reliable sources has been challenging. We can always come back to this later if we find more basemap sources.
We will use the web mercator (EPSG: 3857) projection for AK and Canada. We do want a polar projection basemap for Greenland, however. See https://github.com/nsidc/snow-today-webapp-server/issues/35.
Matt and Sebastian will continue to develop the back-end so that we can choose any basemaps we want in the future.
https://trello.com/c/1kxdQnAG/166-base-maps-in-selected-projection-for-each-region
We currently have the Western US only and use Web Mercator
Here’s the plan for the other regions:
HMA and westernUS: Web Mercator: EPSG:3857
Alaska: Lambert Conformal Conic: EPSG:3978?
Greenland: Polar Stereo
South America: ESRI: 102015 South America Lamber Conformal Conic or ESRI:102032 South_America_EquidistantConic? [Seb] Temporarily Web Mercator EPSG:3857_
Canada: Lambert Conformal Conic: EPSG:9802
Southern European Alps: I think we can use Web Mercator: EPSG:3857
New Zealand: ?