Generate half-resolution tiles from the full-resolution tiles. Actually this isn't specific to the 1:10,000 tiles at all -- should generalise it for other sizes of tiles. Also it's a bit slow, because of the vast number of calls to the netpbm tools it makes.
Generate half-resolution tiles from the full-resolution tiles. Actually this
isn't specific to the 1:10,000 tiles at all -- should generalise it for other
sizes of tiles. Also it's a bit slow, because of the vast number of calls to
the netpbm tools it makes.

alearce88/fixmystreet,datauy/fixmystreet,ciudadanointeligente/barriosenaccion,otmezger/fixmystreet,alearce88/fixmystreet,appstud/fixmystreet,appstud/fixmystreet,mhalden/fixmystreet,otmezger/fixmystreet,opencorato/barriosenaccion,alearce88/fixmystreet,antoinepemeja/fixmystreet,appstud/fixmystreet,rbgdigital/fixmystreet,datauy/fixmystreet,appstud/fixmystreet,ciudadanointeligente/barriosenaccion,dracos/fixmystreet,rbgdigital/fixmystreet,datauy/fixmystreet,opencorato/barriosenaccion,nditech/fixmystreet,otmezger/fixmystreet,antoinepemeja/fixmystreet,eBay-Opportunity-Hack-Chennai-2014/Chennai_Street_Fix,otmezger/fixmystreet,antoinepemeja/fixmystreet,eBay-Opportunity-Hack-Chennai-2014/Chennai_Street_Fix,antoinepemeja/fixmystreet,ciudadanointeligente/barriosenaccion,dracos/fixmystreet,datauy/fixmystreet,altinukshini/lokalizo,rbgdigital/fixmystreet,mhalden/fixmystreet,opencorato/barriosenaccion,rbgdigital/fixmystreet,opencorato/barriosenaccion,nditech/fixmystreet,appstud/fixmystreet,otmezger/fixmystreet,altinukshini/lokalizo,eBay-Opportunity-Hack-Chennai-2014/Chennai_Street_Fix,altinukshini/lokalizo,ciudadanointeligente/barriosenaccion,nditech/fixmystreet,opencorato/barriosenaccion,alearce88/fixmystreet,mhalden/fixmystreet,opencorato/barriosenaccion,mhalden/fixmystreet,eBay-Opportunity-Hack-Chennai-2014/Chennai_Street_Fix,antoinepemeja/fixmystreet,antoinepemeja/fixmystreet,datauy/fixmystreet,eBay-Opportunity-Hack-Chennai-2014/Chennai_Street_Fix,mhalden/fixmystreet,rbgdigital/fixmystreet,dracos/fixmystreet,dracos/fixmystreet,mhalden/fixmystreet,nditech/fixmystreet,datauy/fixmystreet,alearce88/fixmystreet,altinukshini/lokalizo,opencorato/barriosenaccion,rbgdigital/fixmystreet,nditech/fixmystreet,dracos/fixmystreet,alearce88/fixmystreet,dracos/fixmystreet,appstud/fixmystreet,ciudadanointeligente/barriosenaccion,nditech/fixmystreet,altinukshini/lokalizo,antoinepemeja/fixmystreet,appstud/fixmystreet,altinukshini/lokalizo,otmezger/fixmystreet,alearce88/fixmystreet,alearce88/fixmystreet,ciudadanointeligente/barriosenaccion,datauy/fixmystreet,ciudadanointeligente/barriosenaccion,otmezger/fixmystreet,nditech/fixmystreet