Automatically tag a geographical footprint against location, land cover, etc.
iTag can tag a footprint with the following information :
- continents
- countries
- cities
- regions and states
- geophysical plates
- volcanoes
- land cover (i.e. forest, water, urban, cultivated, herbaceous, desert, snow, flooded)
- population count
You can access an online instance [here] (http://mapshup.info/itag) as a web service.
See [video capture of itag applied to Pleiades HR and Spot5 images database] (http://vimeo.com/51045597) and access trough [mapshup] (http://mapshup.info)
iTag is extensively used by [RESTo - REstful Semantic search Tool for geOspatial] (http://github.com/jjrom/resto)
We suppose that $ITAG_HOME is the directory containing this file.
- PHP (v5.3+) command line
- PostgreSQL (v9.0+)
- PostGIS (v1.5.1+)
- GDAL (v1.8+) with python support (for land cover preparation)
Note: iTag could work with lower version of the specified requirements. However there is no guaranty of success and unwanted result may occured !
Edit the PostreSQL postgresql.conf and be sure that postgres accept tcp_ip connection.
# Uncomment these two lines within postgesql.conf
listen_adresses = 'localhost'
port = 5432
-
Unzip data
# Note : $ITAG_HOME **must be** an absolute path (not relative !) cd $ITAG_HOME/installation unzip data.zip -
Install database
# Note : "password" must be the same as # the value of DB_PASSWORD key in $ITAG_HOME/config/config.php cd $ITAG_HOME/installation ./itagInstallDB.sh -F -d <path_to_postgis_directory> -p password -
Populate database
# # Note : Read this if you are using Fedora, Red Hat Enterprise Linux, CentOS, # Scientific Linux, or one of the other distros that enable SELinux by default. # # SELinux policies for PostgreSQL do not permit the server to read files outside # the PostgreSQL data directory, or the file was created by a service covered by # a targeted policy so it has a label that PostgreSQL isn't allowed to read from. # # To make the itagPopulateDB.sh, run the following command as root # # setenforce 0 # # Then after a successful itagPopulateDB.sh relaunch the command # # setenforce 1 # cd $ITAG_HOME/installation/ ./itagPopulateDB.sh -D data -
Download Global Land Cover 2000
Go to ["Global Land Cover 2000" global product] (http://bioval.jrc.ec.europa.eu/products/glc2000/products.php) and download glc2000 GeoTIFF file.
- Configure
Edit $ITAG_HOME/config/config.php (just follow the comments !)
-
Precompute landcover
cd $ITAG_HOME/scripts/ ./prepareLandCover.php
Note : depending on your server performance, the landcover computation can take a long time (more than two hours)
cd $ITAG_HOME
php itag.php -h
#
# USAGE : php itag.php [options] -f <footprint in WKT> (or -d <db connection info>)
# OPTIONS:
# -o [type] : output (json|pretty|insert|copy|hstore) - Note : if -d is choosen only 'hstore', 'insert' and 'copy' are used
# -H : display hierarchical continents/countries/regions/cities (otherwise keywords are "flat")
# -O : compute and order result by area of intersection
# -c : Countries
# -x : Continents
# -C : Cities (main|all)
# -R : Administrative level 1 (i.e. Regions and departements for France, USA states, etc.)
# -p : Population
# -g : Geophysical information (i.e. plates, volcanoes)
# -l : Land Cover (i.e. Thematical content - forest, water, urban, etc.
# -d : DB connection info - dbhost:dbname:dbschema:dbuser:dbpassword:dbport:tableName:identifierColumnName:geometryColumnName
#
#
# Tag footprint on Sicilia with countries, all cities and geophysical information
#
php itag.php -cg -C all -f "POLYGON((13.304225 37.47162,13.304225 38.433184,17.259303 38.433184,17.259303 37.47162,13.304225 37.47162))"
#
# Tag footprint on Toulouse with French region, land cover and population
#
php itag.php -Rgp -f "POLYGON((1.350360 43.532822,1.350360 43.668522,1.515350 43.668522,1.515350 43.532822,1.350360 43.532822))"
#
# Hierarchized Tag footprint intersecting France, Italy and Switzerland unordered and ordered
#
php itag.php -c -H -f "POLYGON((6.487426757812523 45.76081241294796,6.487426757812523 46.06798615804025,7.80578613281244 46.06798615804025,7.80578613281244 45.76081241294796, 6.487426757812523 45.76081241294796))"
php itag.php -c -H -O -f "POLYGON((6.487426757812523 45.76081241294796,6.487426757812523 46.06798615804025,7.80578613281244 46.06798615804025,7.80578613281244 45.76081241294796, 6.487426757812523 45.76081241294796))"
#
# Tag footprints from table "products" of database "test"
#
# With the following parameters:
# - dbhost : localhost
# - dbname : test
# - dbschema : public
# - dbuser : postgres
# - dbpassword : postgres
# - dbport : 5432
# - tableName : products
# - identifierColumnName : identifier
# - geometryColumnName : footprint
#
#
# Note : Output is set to hstore and redirect to /tmp/hstore.sql
#
php itag.php -d localhost:test:public:postgres:postgres:5432:products:identifier:footprint -c -o hstore > /tmp/hstore.sql
We suppose that $ITAG_HOME is accessible to http://localhost/itag/ in Apache.
To tag footprint on Toulouse with geophysical information and all cities with a pretty GeoJSON output, open this url within you browser
http://localhost/itag/?geophysical=true&countries=true&cities=all&output=pretty&footprint=POLYGON((1.350360%2043.532822,1.350360%2043.668522,1.515350%2043.668522,1.515350%2043.532822,1.350360%2043.532822))
Available parameters for Web service are :
- &countries=true
- &cities=main (or &cities=all)
- &population=true
- &geophysical=true
- ®ions=true
- &landcover=true
You can check this [running instance] (http://mapshup.info/itag/) - (note : landcover is disabled on this server)
Examples :
Tag footprint on Toulouse with geophysical information and all cities with a pretty GeoJSON output
http://mapshup.info/itag/?geophysical=true&countries=true&cities=all&output=pretty&footprint=POLYGON((1.350360%2043.532822,1.350360%2043.668522,1.515350%2043.668522,1.515350%2043.532822,1.350360%2043.532822))
Tag footprint intersecting France, Italy and Switzerland with cities, regions and states. Hierarchical result as pretty GeoJSON output
http://mapshup.info/itag/?regions=true&hierarchical=true&ordered=true&countries=true&cities=all&output=pretty&footprint=POLYGON((6.487426757812523%2045.76081241294796,6.487426757812523%2046.06798615804025,7.80578613281244%2046.06798615804025,7.80578613281244%2045.76081241294796,6.487426757812523%2045.76081241294796))
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