[gdal-dev] Geotiff "client side"

[Peter Baumann]

Hi Xavier,

there is a couple of options with WCS 2.

- you can request another format which is easier to handle by the client, such 
as PNG (builtin browser support).

- you can send a separate DescibeCoverage request and get an XML structure 
containing all metadata.

- you can direct the server (if it supports this - data formats are at its 
discretion) to deliver a multipart MIME document (same mechanism as email + 
attachment). Its first part will be the coverage description in XML, the second 
part the (TIFF or PNG or ...) image.To this end, use this request syntax 
(presented in GET/KVP and TIFF, for POST/XML see the protocol binding specs):
     http://.../wcs?REQUEST=GetCoverage & ... &
         FORMAT=image/tiff & MEDIATYPE=multipart/related

HTH,
Peter



On 10/03/2014 09:48 AM, xavier lhomme wrote:
> Hi
>
>   WCS has the ability to return a coverage as a GeoTiff file. Then if you want 
> to display or process row data from this file in a Javascript web client, you 
> need to have to ability to decode the "GeoTiff" part of this file.
>
>  I found a Tiff.js library compiled with Emscripten. I succeed to display a 
> GeoTiff with this library as a Tiff file. But I still need to decode the 
> GeoTiff tag and create the "PCSToImage" / "ImageToPCS" functions.
>   Two solutions :
>        compile GeoTiff with emscripten or rewrite some part of the GeoTiff 
> function in javascript.
> Another solution should be to ask the server to return the parameter from the 
> image. Is there a way to do this without sending the full image to the server ?
>
>
> Best regards
>
> xavier lhomme

-- 
Dr. Peter Baumann
  - Professor of Computer Science, Jacobs University Bremen
    www.faculty.jacobs-university.de/pbaumann
    mail: p.baumann at jacobs-university.de
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