rfe: add reversed y-tile ID flag for gdal2tiles.py TMS output

[hamish]

Hi,

it seems that OpenStreetMap's tiles¹ follow Google Maps in making 0,0 the top-left tile not the bottom-left tile as in the TMS spec². gdal2tiles.py refers this³ but doesn't let you do anything about it.

For compatibility with OSM's software, it would be nice if gdal2tiles.py had a flag to generate tile IDs upside-down. I've filed a similar bug at the OSM end of things.⁴

• ¹ : ​http://wiki.openstreetmap.org/wiki/Slippy_map_tilenames#X_and_Y
• ² : ​http://wiki.osgeo.org/wiki/Tile_Map_Service_Specification#Tile_Resources
• ³ : source:trunk/gdal/swig/python/scripts/gdal2tiles.py@19288#L146​
• ⁴ : ​http://trac.openstreetmap.org/ticket/2995

or would this totally break OpenLayers et al. and better to just nudge others to follow the spec?

thanks, Hamish

[hamish]

apparently already fixed in OSM's Merkaartor software's trunk.

talking the liberty of closing as wontfix; feel free to reopen if anyone thinks it might be interesting.

[hamish]

not specifically the same wish, but fwiw see also r26204

[kking009]

Reopened because:

1. The feature would enable compliance to the WMTS standard: It becomes possible to build a light footprint WMTS server by simply deploying a GetCapybility.xml file and a bunch of png Tiles to a Web-Server.
2. Simple to implement. Required changes see ​here.
3. Bring back all informal gdal2tiles branches to gdal. See this ​example of an informal gdal branch.
4. The internet shows lots of people wait for this feature.

[sfkeller]

I'm supporting this enhancement request.

Just to be picky, I think @kking009 refers to WMTSCapabilities.xml (not GetCapybility?.xml) as used and (partially) documented here ​https://www.basemap.at/wmts/1.0.0/WMTSCapabilities.xml .

[Even Rouault]

This ticket has been automatically closed because Trac is no longer used for GDAL bug tracking, since the project has migrated to GitHub. If you believe this ticket is still valid, you may file it to ​https://github.com/OSGeo/gdal/issues if it is not already reported there.