Re: [gdal-dev] Idea: GeoTIFF box in JPEG to add georeferencing

2014-05-14 Thread Even Rouault
so which ones are remaining, following the clarification you mention below? Hi Peter, thanks for the clarifications. To be honest, my main reluctance to GML-based standards is that they are very rich, and thus difficult to understand and implement. A rather large chain of depending standards

Re: [gdal-dev] Idea: GeoTIFF box in JPEG to add georeferencing

2014-05-12 Thread Etienne Tourigny
Right, I didn't think of the need to create new EXIF tags. I think it is a good idea to use existing GTIFF tags to encode this information. On the other hand, the method used in jpeg files should ideally be the same used in other formats (e.g. png, gif) for which it is possible to add extra

Re: [gdal-dev] Idea: GeoTIFF box in JPEG to add georeferencing

2014-05-12 Thread Even Rouault
Le lundi 12 mai 2014 21:15:35, Etienne Tourigny a écrit : Right, I didn't think of the need to create new EXIF tags. I think it is a good idea to use existing GTIFF tags to encode this information. On the other hand, the method used in jpeg files should ideally be the same used in other

Re: [gdal-dev] Idea: GeoTIFF box in JPEG to add georeferencing

2014-05-12 Thread Peter Baumann
PS: not sure all on this list are aware of this overview page: http://external.opengeospatial.org/twiki_public/CoveragesDWG/CoveragesBigPicture -Peter On 05/12/2014 11:38 PM, Peter Baumann wrote: Hi all, just saw this, thought I'd chime in being the editor of GMLCOV :) Any questions, I'll

Re: [gdal-dev] Idea: GeoTIFF box in JPEG to add georeferencing

2014-05-12 Thread Rahkonen Jukka (Tike)
Hi, This is just a small detail and I may be wrong, but I fear that axisLabels element does not universally remove the need to go to the database because there are systems which use X and Y as axis names, but the meaning of X and Y can be different. For example for EPSG:3857 X means Easting

[gdal-dev] Idea: GeoTIFF box in JPEG to add georeferencing

2014-05-10 Thread Even Rouault
Hi, I'm wondering if there's some interest in standardizing a way of embedding georeferencing information in popular image formats like JPEG or PNG. I've just been doing an experiment with JPEG. My solution is to use a GeoTIFF box as specified in § 2.2 Box contents of

Re: [gdal-dev] Idea: GeoTIFF box in JPEG to add georeferencing

2014-05-10 Thread Etienne Tourigny
Hi Even, why not simply add the geotransform and WKT or PROJ.4 string as exif tags? simple to read outside of gdal (any exif reader will support this) and implement using libexif. just my 2 cents. Etienne On Sat, May 10, 2014 at 5:21 PM, Even Rouault even.roua...@mines-paris.orgwrote: Hi,

Re: [gdal-dev] Idea: GeoTIFF box in JPEG to add georeferencing

2014-05-10 Thread Even Rouault
Le samedi 10 mai 2014 23:31:30, Etienne Tourigny a écrit : Hi Even, why not simply add the geotransform and WKT or PROJ.4 string as exif tags? simple to read outside of gdal (any exif reader will support this) and implement using libexif. You would have to create new EXIF tags for that. The