Creating a GRASS location with google projection

g.proj -c epsg=900913 loc=Istanbul_900913

Configuring postgresql in debian

After the installation from the debian packages, you should run :

sudo pg_createcluster 8.3 main

To make the server listen to the network edit /etc/postgresql/8.3/main/postgresql.conf and modify it to read :

listen_addresses = '*' # what IP address(es) to listen on;

and edit /etc/postgresql/8.3/main/pg_hba.conf and add a line for each user you would like to authorize the user called "myuser" who is located on network 201.171.245.62/32 for using the database "mydb" :

host mydb my user 201.171.245.62/32 md5

and then grant privileges to that user on the table geometry_columns :

psql mydb
GRANT select, insert, update, delete ON TABLE public.geometry_columns TO myuser;

debian : locales problem

export LANGUAGE=en_US.UTF-8
export LANG=en_US.UTF-8
export LC_ALL=en_US.UTF-8
locale-gen en_US.UTF-8
dpkg-reconfigure locales

debian : choosing java VM

update-alternatives --config java
update-alternatives --config javac

OpenStreetMap+PostGIS+Geoserver in Ubuntu

After a fresh install one needs to create access to PostgreSQL. Use the instructions
in https://wiki.ubuntu.com/PostgreSQL

Create the database "osm"
createdb osm

Prepare the database
psql osm -c "ALTER TABLE spatial_ref_sys OWNER TO acizmeli"
psql osm -c "ALTER TABLE geometry_columns OWNER TO acizmeli"
psql -d osm -f /usr/share/postgresql/8.4/contrib/postgis-1.5/postgis.sql
(debian) psql -d osm -f /usr/share/postgresql-8.3-postgis/lwpostgis.sql
(debian) psql -d osm -f /usr/share/postgresql-8.3-postgis/spatial_ref_sys.sql
createlang plpgsql osm


Enable the projection SRS 900913 in PostGIS (Spherical Mercator)
wget http://svn.openstreetmap.org/applications/utils/export/osm2pgsql/900913.sql
psql -f 900913.sql osm

Downlod the OSM data files (for Turkey)
http://downloads.cloudmade.com/asia/turkey#downloads_breadcrumbs

Download the world coastline database (as described in http://wiki.openstreetmap.org/wiki/Mapnik)
wget http://tile.openstreetmap.org/world_boundaries-spherical.tgz (50 MB)
wget http://tile.openstreetmap.org/processed_p.tar.bz2 (357 MB)
wget http://tile.openstreetmap.org/shoreline_300.tar.bz2 (48 MB)
wget http://www.naturalearthdata.com/download/10m/cultural/10m-populated-places.zip (1.5 MB)
wget http://www.naturalearthdata.com/download/110m/cultural/110m-admin-0-boundary-lines.zip (38 KB)

Extract the Marmara region from the high resolution land polygon and assign the missing projection information "EPSG:3785"
ogr2ogr -s_srs "EPSG:3785" -a_srs "EPSG:3785"  -where
"tile_x >= 228  AND tile_x <= 233  AND tile_y >= 248 AND tile_y <= 251"
Marmara_land_polygon_EPSG_3785.shp processed_p.shp     

Edit the OSM data in JOSM and fix the following features :
* Give the Küçükçekmece dam the attribute landuse=reservoir
* Create the polygon for the Durugöl dam (which did not exist)   

Import the OSM data in PostGIS osm2pgsql -d osm OSM/turkey.osm     

Worked the coastline edges of the mahalle polygons in OpenJump for it to match
those of Marmara_land_polygon.

A shapefile output from OpenJump does not put projection info in the output file.
To set it manually : 

ogr2ogr -a_srs EPSG:900913 mahalle_EPSG_900913_reworked.shp /WIN_C/Users/user/Desktop/mahalle_EPSG_900913_reworked.shp   

gdalwarp -wo SOURCE_EXTRA=125 -srcnodata "11 10 50"
-dstalpha  -t_srs '+proj=ortho +datum=WGS84' geoworld.tif ortho.tif