Chopping OS 10k raster maps

Another post in the series 'things I found in my mailbox that I mailed myself as an aide-memoire'

This one relates to the chopping up of map tiles. In this case, the tiles were supplied in a directory tree.

The post:

10k files come in a tree so we need to flatten it:

Copy the OS files from the dir tree to a flat dir:

for /R d:\data %i IN (*.jpg) DO xcopy %i c:\dest /S

Add the associated .tab files (in order to provide geo-referencing)

http://www.ordnancesurvey.co.uk/oswebsite/products/georeferencing/aboutpopup.html

Download FWTools

http://fwtools.maptools.org/

and run the shell

Build a virtual raster

gdalbuildvrt 10k.vrt *.tif

Convert virtual raster to actual ECW (ERMapper Compressed Wavelets)

gdal_translate -of ECW -co LARGE_OK=YES -expand rgb -a_srs EPSG:27700 10k.vrt 10k.ecw

Process the ECW with a tiler such as

http://www.klokan.cz/projects/gdal2tiles/

or, with the GUI

http://www.maptiler.org/

A nice summary and related info

http://epsg27700.blogspot.com/2009/09/processing-ordnance-survey-rasters-with.html

Mapping brain-dump archive

While clearing out my unused Gmail labels and I keep coming across tidbits that it appears I at one time felt would be useful to hang on to, if not for any practical technical purpose then as nostalgia.

Deciding that my mailbox isn't really the most appropriate place for such 'memories', I'm dumping them here.

Perhaps some day they'll be useful to me or some other soul.

Here are the links and their somewhat terse descriptions which obviously meant a lot at the time:

http://www.nearby.org.uk/

Useful Geo tools/conversions

http://epsg27700.blogspot.com/2009/09/processing-ordnance-survey-rasters-with.html

Does what it says on the tin

http://www.maptiler.org/

Map tile generator

http://www.klokan.cz/projects/gdal2tiles/

Command line map tiler (engine for the above)

http://www.ordnancesurvey.co.uk/oswebsite/products/georeferencing/aboutpopup.html

.tab files for georeferencing OS map data

http://en.wikipedia.org/wiki/British_national_grid_reference_system

General blurb

http://fwtools.maptools.org/

Command line tools for geo stuff

http://www.codeplex.com/SharpMap

C# Geospatial application framework