[gdal-dev] COG + javascript + openlayers

[Vincent Sarago]

:-) 

Sorry Javier, and thanks for the ping Patrick. 

Javier, I’ve invited you to the cogeotiff slack channel, which might just be easier to contact people working on COG and dynamic tiling.

https://developmentseed.org/titiler/dynamic_tiling/ <https://developmentseed.org/titiler/dynamic_tiling/> might also be of interest for you.

Regards,

Vincent 


> On Apr 13, 2021, at 11:35 AM, Patrick Young <patrick.mckendree.young at gmail.com> wrote:
> 
> There is a COG mailing list (not very active from the looks of it):
> 
> https://lists.osgeo.org/mailman/listinfo/cog <https://lists.osgeo.org/mailman/listinfo/cog>
> 
> You might ping Vincent https://github.com/vincentsarago <https://github.com/vincentsarago> too!
> 
> P
> 
> On Tue, Apr 13, 2021 at 2:31 AM Javier Jimenez Shaw <j1 at jimenezshaw.com <mailto:j1 at jimenezshaw.com>> wrote:
> Maybe this channel is not the best place for this question. Do you know a better place to ask?
> 
> Thank you
> .___ ._ ..._ .. . ._.  .___ .. __ . _. . __..  ... .... ._ .__
> Entre dos pensamientos racionales 
> hay infinitos pensamientos irracionales.
> 
> 
> 
> On Tue, 6 Apr 2021 at 22:40, Javier Jimenez Shaw <j1 at jimenezshaw.com <mailto:j1 at jimenezshaw.com>> wrote:
> Hi
> 
> While I was reading about COG format, I thought it was great to replace "gdal2tiles" if the COG was properly generated (I mean, using the option TILING_SCHEME=GoogleMapsCompatible , and maybe something else I miss. I am generating it, so I can optimize that).
> Then I was expecting that geotiff.js (or any other client js library) will be able to do the proper RANGE request to produce the tiling that libraries like openlayers of leaflet is expecting. Yes, in Web Mercator projection with aligned tiles, so no transformation is needed.
> 
> My initial target is just for RGBA uint8 images... plain vanilla. Storing the COG file in S3, without any proxy in between doing any conversion. Just relying on the RANGE request to get the needed area. My initial idea is to keep the openlayers/leaflet 256x256 tiles. This allows parallel requests to the server, and is very fast (and I do not have to refactor all my js code). But maybe there is a better/faster solution (again, with S3 direct access, no proxy in the server side. That would require deploying the "proxy" on every geographical region).
> 
> However I have not found any proper solution (my search-fu is not the best, to be honest). I would like something that performs at least as fast as the tiles produced by gdal2tiles.
> 
> Do you know any solution/example?
> 
> Thanks
> .___ ._ ..._ .. . ._.  .___ .. __ . _. . __..  ... .... ._ .__
> Entre dos pensamientos racionales 
> hay infinitos pensamientos irracionales.
> 
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