[gdal-dev] COG + javascript + openlayers

[Patrick Young]

There is a COG mailing list (not very active from the looks of it):

https://lists.osgeo.org/mailman/listinfo/cog

You might ping Vincent https://github.com/vincentsarago too!

P

On Tue, Apr 13, 2021 at 2:31 AM Javier Jimenez Shaw <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>
> 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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>
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