[mapserver-users] Mapcache support for multiple format types

[Cechini, Matthew F. (GSFC-423.0)[Science Systems & Applications, Inc.]]

A compelling situation could be a layer that has uses cases where you want it have transparency or not, making it an “overlay” or “base layer” respectively.

Though, if you’re serving it as 24+1bit PNG with transparency, you’re gonna lose quality in JPEG, so you would probably want to return a 24bit PNG.  And at that point, you would have to have separate layers because the mime type is the same.

As an aside, a member of our team did work on a JPNG approach where tiles that require transparency are PNG and those that do not are JPEG.  The devil is in the details of quality mapping with that though.

Matt
.................................................................
Matthew Cechini
Contractor, Science Systems and Applications, Inc.
NASA GIBS Systems/Software Engineer
410.205.6272

From: mapserver-users <mapserver-users-bounces at lists.osgeo.org<mailto:mapserver-users-bounces at lists.osgeo.org>> on behalf of thomas bonfort <thomas.bonfort at gmail.com<mailto:thomas.bonfort at gmail.com>>
Date: Tuesday, November 22, 2016 at 1:28 PM
To: tellett <thomas.ellett at statkart.no<mailto:thomas.ellett at statkart.no>>, "mapserver-users at lists.osgeo.org<mailto:mapserver-users at lists.osgeo.org>" <mapserver-users at lists.osgeo.org<mailto:mapserver-users at lists.osgeo.org>>
Subject: Re: [mapserver-users] Mapcache support for multiple format types

Hi Tom,
My question wasn't clear, or you did not answer my question ;-)
I was looking for a compelling *use-case* where the solution requires a tile server to support both jpeg and png for a given tileset. My stance for mapcache is that the data producer (i.e. you as the mapcache administrator) knows his data and therefore which format (*singular*) is best suited for a given tileset. I'd be happy to revisit my judgment if presented with a scenario where more than one format per tileset is actually needed.

Cheers,
Thomas

On Tue, Nov 22, 2016 at 12:19 PM tellett <thomas.ellett at statkart.no<mailto:thomas.ellett at statkart.no>> wrote:
Hi Thomas,

Really, its just so that we don't need to have 2 separate layers in the
service for each format type. The norwegian mapping authority has about 25
cache 'services' and so its a bit messy in the config and WMTS capabilities
file if we have to have 50 tilesets instead of 25.

Its no problem technically having 2 tilesets called 'topo2_png' and
'topo2_jpeg' for example (they would have the same title and abstract), it
just would have been preferable for us to have 1 layer support multiple
formats so that the client could call the same service/layer/tileset and
choose the format type through the kvp parameter. Not a show-stopper for us,
we just have to change our way of thinking :)

Tom



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