------------------------------------------------------------ revno: 150 committer: Knut Staring <knu...@knutst-laptop> branch nick: dhis2-docbook-docs timestamp: Wed 2010-03-24 11:45:02 +0100 message: Added info about raster and vector GIS data modified: src/docbkx/en/dhis2_user_man_gis.xml
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=== modified file 'src/docbkx/en/dhis2_user_man_gis.xml' --- src/docbkx/en/dhis2_user_man_gis.xml 2010-03-11 18:46:46 +0000 +++ src/docbkx/en/dhis2_user_man_gis.xml 2010-03-24 10:45:02 +0000 @@ -2,6 +2,34 @@ <!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN" "http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd"; []> <chapter> <title>GIS</title> + <section> + <title>OpenHealthMapper</title> + <para>The DHIS 2 GIS module is inspired by the WHO HealthMapper application. + </para> + </section> + <section> + <title>Identifying map data</title> + <para>Geographical data can be divided in two basic groups - raster and vector. + + <section><title>Raster images</title>Raster can be thought of as pictures such as + sattelite images. Images can be used as background for maps, and the OHM can pull them in from any standard compliant + <ulink url="http://en.wikipedia.org/wiki/Web_Map_Service";>Web Map Service (WMS)</ulink>. It is also of great interest to + combine the DHIS2 installation with a <ulink url="http://geoserver.org/display/GEOS/Welcome";>GeoServer</ulink> instance, + which can be downloaded as a .war-file and run in the same servlet container (e.g. Tomcat, Jetty, Resin). Geoserver can provide + both background layers such as roads, lakes etc. or also display thematic data as an alternative to the browser-rendered + main mode which uses GeoJSON. + </section> + <section><title>Vector data</title> + In order to create thematic maps (also known as <ulink url="http://en.wikipedia.org/wiki/Choropleth_map";>choropleth maps</ulink>) + we need to have vector polygons (e.g. for facility catchment areas or administrative regions). Also, vector files are required for + points (e.g. health facility locations or even different wards within a hospital). Such vector files consist of a collection of (x,y) + coordinates with a number of associated attributes (at least a name). Vector data can come in a lot of formats, such as GPS + coordinates for facilities. The most common is the <ulink url="http://en.wikipedia.org/wiki/Shapefile";>ESRI shapefile format</ulink>. + In order to make web maps interactive, DHIS 2 uses the <ulink url="http://en.wikipedia.org/wiki/GeoJSON";>javascript GeoJSON format</ulink>.. + </section> + + </para> + </section> <section> <title>Conversion of geographical data to GeoJSON format</title> <para>The DHIS2 mapping client relies on GeoJSON files in order to display
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