[gdal-dev] Re: how to acces to PDS meta data

[lidiriel]

Thanks for your response. I will look your changeset and try for my
requirements.

On 13 jan, 19:46, Frank Warmerdam <warmer... at pobox.com> wrote:
> Ludovic Mercier wrote:
> > Hi all,
>
> > I try to use gdal and otb (http://smsc.cnes.fr/PLEIADES/lien3_vm.htm)
> > with pds file.
> > I try to get value associated to a key (meta-data).
> > for an exemple the file : Index of /gdal/data/mc02.img contain :
> > SPACECRAFT_NAME                = "MARS GLOBAL SURVEYOR"
> > INSTRUMENT_NAME                = "MARS ORBITER CAMERA"
> > INSTRUMENT_ID                  = "MOC-WA"
> > TARGET_NAME                    = "MARS"
> > FILTER_NAME                    = "RED"
>
> > I would like to access to the key/value FILTER_NAME. But the function
> > GetMetadata return nothing !
> > I look in the source code (file pdsdataset.cpp) and the interresting
> > method is "GetKeyword()" but it is a private method.
>
> > Is someone have an idea how to get all meta data or specific meta-
> > data ?
>
> > I think is it impossible in fact.. but perhaps is it possible if i add
> > new functionnality
> > in the pds driver....
>
> Ludovic,
>
> You are correct that none of these header fields are currently exposed
> by the PDS (or ISIS2, and ISIS3) drivers as metadata.  It would be
> quite easy to modify the driver to transfer specific keywords and their
> associated value to the metadata object, but it is unclear which ones would
> be useful.
>
> I have gone ahead and added support in the PDS driver to transfer a bunch
> of keywords over.  The gdalinfo results now look like:
>
> ...
> Origin = (-10668384.903788566589355,3852176.483988761901855)
> Pixel Size = (926.115274429321289,-926.115274429321289)
> Metadata:
>    FILTER_NAME="RED"
>    DATA_SET_ID="MGS-M-MOC-4-WAMOS-V1.0"
>    PRODUCT_ID="MC02"
>    PRODUCER_INSTITUTION_NAME="MALIN SPACE SCIENCE SYSTEMS"
>    PRODUCT_TYPE="MOSAIC"
>    MISSION_NAME="MARS GLOBAL SURVEYOR"
>    SPACECRAFT_NAME="MARS GLOBAL SURVEYOR"
>    INSTRUMENT_NAME="MARS ORBITER CAMERA"
>    INSTRUMENT_ID="MOC-WA"
>    TARGET_NAME="MARS"
>    CENTER_FILTER_WAVELENGTH=600.0000
>    BANDWIDTH=50.0000
>    PRODUCT_CREATION_TIME=2001-11-28T00:00:00
>    NOTE="GEODESY CAMPAIGN MOSAIC"
> Corner Coordinates:
> ...
>
> The new support is only in trunk and new keywords can be added quite
> easily.
>
>    http://trac.osgeo.org/gdal/changeset/16077
>
> Best regards,
> --
> ---------------------------------------+--------------------------------------
> I set the clouds in motion - turn up   | Frank Warmerdam, warmer... at pobox.com
> light and sound - activate the windows |http://pobox.com/~warmerdam
> and watch the world go round - Rush    | Geospatial Programmer for Rent
>
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