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Message #05084
[Branch ~dhis2-documenters/dhis2/dhis2-docbook-docs] Rev 154: Fixed error
------------------------------------------------------------
revno: 154
committer: Knut Staring <knutst@knutst-laptop>
branch nick: dhis2-docbook-docs
timestamp: Wed 2010-03-24 17:05:35 +0100
message:
Fixed error
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 2010-03-24 15:30:22 +0000
+++ src/docbkx/en/dhis2_user_man_gis.xml 2010-03-24 16:05:35 +0000
@@ -1,1 +1,303 @@
-
\ No newline at end of file
+<?xml version='1.0' encoding='UTF-8'?>
+<!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>
+ <section><title>Getting data</title><para>
+ In order to use the OHM with DHIS2, it is necessary to have vector data for each orgunit level one wants to see in the map.
+ In many countries, the Ministry of Health will have shapefiles for the health-related administrative divisions. In other cases,
+ such files may have to be procured from a ministry of planning or from private vendors. Facility coordinates can easily be
+ assembled into a layer (file) for facilities - and if they are not available, these can be collected by cheap GPS units (increasingly
+ available also in mobile phones). Additionally, a lot of data are available freely on the web - especially bacground layers and
+ overlays, but also facility positions and administrative boundaries. Below is a list of sources of such data:
+ <itemizedlist>
+ <listitem><ulink url="http://www.openstreetmap.org";>OpenStreetMap</ulink> <ulink url="http://www.openhealthconsortium.org/wiki/
+ doku.php?id=layers_from_openstreetmap">Handling the layers</ulink>
+ </listitem>
+ <listitem><ulink url="http://www.maplibrary.org/stacks/africa";>Maplibrary</ulink></listitem>
+ <listitem><ulink url="http://www.gadm.org/country";>Global Administrative Areas</ulink></listitem>
+ <listitem><ulink url="http://www.unsalb.org";>UN organizations, especially WHO and FAO, have administrative boundaries</ulink></listitem>
+ </itemizedlist>
+ </para></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
+ a map in the browser window. Often times, geographical data is received in
+ many different formats, but the ESRI shape file format is one of the most
+ common. Several procedures will be described below. It is important, but
+ not required, that the names in your geographical data match those in the
+ DHIS2 organisational hierarchy. If they do not, you will need to manually
+ match them in a later step</para>
+ <section>
+ <title>Production of GeoJSON files with Geoserver</title>
+ <para>Geoserver is capable of outputting GeoJSON formats. If you have
+ geoserver running someplace, you can execute the following query.</para>
+ <para><ulink url="http://localhost:8080/geoserver/ows?service=WFS&version=1.0.0&request=GetFeature&typename=topp:states&outputformat=json&srs_name=EPSG:4326";>http://localhost:8080/geoserver/ows?service=WFS&version=1.0.0&request=GetFeature&typename=topp:states&outputformat=json&srs_name=EPSG:4326</ulink></para>
+ <para> Take note that you need to specify the spatial coordinate system. By default, Geoserver will return GeoJSON files with the format "long/lat" while
+the DHIS mapping client expects the ordering of the coordinates in "lat/long" format. The explicit declaration of the spatial reference system will ensure that coordinates are returned in the proper order. At the time of writing, the DHIS mapping client does not support spatial reference systems other than EPSG 4326. If you are using Geoserver, the application will handle the reprojection from the native format of the geographical data to EPSG 4326. If you are using other methods as described below to generate the GeoJSON file, you will need to ensure that the GeoJSON output is set to EPSG 4326 (Geographical Lat/long). </para>
+ <para>You will need to adjust the host destination if the machine is not
+ your local machine as well as defining the actual layer in Geoserver
+ which should be output to GeoJSON (in this case
+ <parameter>topp:states</parameter>).</para>
+ <para>Upon execution of the URL, Geoserver will produce a GeoJSON file,
+ and you will be asked to save it. Once it has finished downloading,
+ rename the file following the suggested naming convention:</para>
+ <para>ISO2CountryCode followed by an underscore, followed by the layer
+ type (e.g. “admin†for administrative layers, “health†for health
+ administrative boundaries). For instance, the first administrative layer
+ for Zambia would be named as "zm_admin1".</para>
+ </section>
+ <section>
+ <title>Production of GeoJSON files with GDAL</title>
+ <para>GDAL is a multi-platform toolkit for the manipulation of
+ geographical data. It is freely available for a wide-range of platforms
+ at <ulink url="http://gdal.org";>http://gdal.org</ulink></para>
+ <para>Production of GeoJSON files are straightforward with GDAL. Just
+ execute (on Windows)</para>
+ <programlisting><userinput>ogr2ogr.exe -f "GeoJSON" dst_datasource_name src_datasource_name</userinput></programlisting>
+ <para>or on Linux<programlisting><userinput>ogr2ogr -f "GeoJSON"dst_datasource_name src_datasource_name</userinput></programlisting></para>
+ <para>Replace <parameter>dst_datasource_name</parameter> with the path
+ to the destination geographical data file (following the naming
+ convention described above) and
+ <parameter>src_datasource_name</parameter> with the source geographical
+ data file. Take note that you may need to specify input and output coordinate systems as described above.</para>
+ </section>
+ <section>
+ <title>Copying files to the DHIS application</title>
+ <para>Currently, your GeoJSON files should be placed in the
+ DHIS_HOME/geoson of your DHIS application to be accessible to the GIS
+ module. If the GeoJSON directory does not exist, you will need to create
+ it manually and copy your GeoJSON files there.</para>
+ </section>
+ </section>
+ <section id="gisAdministration">
+ <title>Administrator panel</title>
+ <screenshot>
+ <graphic fileref="resources/images/GIS/admin_panel.png" align="center"/>
+ </screenshot>
+ <itemizedlist>
+ <listitem>
+ <para>Map source</para>
+ <para><guilabel>GeoJSON files:</guilabel> you will find your own
+ registered maps in the Map combo box in the Thematic map panel.
+ The Admin panels check box will become visible.</para>
+ <para><guilabel>Shapefiles:</guilabel> same as GeoJSON files, except that the files are generated from shapefiles installed in your running version of Geoserver on the fly.</para>
+ <para><guilabel>DHIS database:</guilabel> the Map combo box will
+ simply be populated by the existing organisation unit levels and
+ GeoJSON files will be created by the application automatically
+ Organisation units must have coordinates stored in the database in
+ order to be displayed in the map. This function is mainly intended
+ for the facility level as it is easy to maintain and thus will
+ offer up-to-date shapefiles.</para>
+ </listitem>
+ <listitem>
+ <para>Admin panels: Show/hide the shapefile management panels.</para>
+ </listitem>
+ <listitem>
+ <para>Longitude/latitude: The base coordinate for the current country. This coordinate will appear as default when registering maps and overlays.</para>
+ </listitem>
+ </itemizedlist>
+ </section>
+ <section id="gisMap">
+ <title>Registering geographical information</title>
+ <para>In order to view data in the GIS module, you must import your
+ geographical data into your DHIS installation. Once you have produced
+ GeoJSON files according to the procedure above, and imported them into the
+ system, you will need to establish a correspondence between the
+ information in the DHIS database, and the GeoJSON file.</para>
+ <screenshot>
+ <screeninfo>Register Geodata Panel</screeninfo>
+ <mediaobject>
+ <imageobject>
+ <imagedata align="center" fileref="resources/images/GIS/register_geodata.png"/>
+ </imageobject>
+ </mediaobject>
+ </screenshot>
+ <itemizedlist>
+ <listitem>
+ <para><guilabel>Display name:</guilabel> Represents your map in the Map combo box in the Thematic map panel.</para>
+ </listitem>
+ <listitem>
+ <para><guilabel>Organisation unit level:</guilabel> The level of the organization units displayed in the GeoJSON file.</para>
+ </listitem>
+ <listitem>
+ <para><guilabel>Map source file:</guilabel> The GeoJSON file name. These files must be placed in the
+ mapping/geojson folder. Use e.g. Geoserver 2.0 (currently RC1) to
+ easily produce GeoJSON from your shapefiles.</para>
+ </listitem>
+
+ <listitem>
+ <para><guilabel>Name column:</guilabel> The shapefile data column (case sensitive!) that will be
+ matched against DHIS organisation unit names. If you have an
+ instance of Geoserver installed, you can view the layer through the
+ built-in OpenLayers client. Click on a particular area, and the
+ possible fields will be displayed.</para>
+ <screenshot>
+ <screeninfo>Identification of the name column with Geoserver's OpenLayers client</screeninfo>
+ <mediaobject>
+ <imageobject>
+ <imagedata width="80%" align="center" fileref="resources/images/GIS/get_name_geoserver.png"/>
+ </imageobject>
+ </mediaobject>
+ </screenshot>
+ <screenshot>
+ <screeninfo>Identification of the name column directly in the GeoJSON file</screeninfo>
+ <mediaobject>
+ <imageobject>
+ <imagedata width="80%" align="center" fileref="resources/images/GIS/get_name_geojson.png"/>
+ </imageobject>
+ </mediaobject>
+ </screenshot>
+ </listitem>
+ <listitem>
+ <para><guilabel>Longitude / latitude:</guilabel> The longitude and latitude refer to the approximate point
+ where the map will be centered after rendering. If you have
+ Geoserver running, you can view the layer through the integrated
+ OpenLayers client and determine a good center point for your map.
+ You can also use the background map of the DHIS GIS module, and
+ determine an approximate location. You may need to experiment a bit
+ with the center point and zoom level in order to get it
+ correct.</para>
+ <screenshot>
+ <screeninfo>Using Geoserver OpenLayers client to get the map center point</screeninfo>
+ <mediaobject>
+ <imageobject>
+ <imagedata width="80%" align="center" fileref="resources/images/GIS/geoserver_center_point.png"/>
+ </imageobject>
+ </mediaobject>
+ </screenshot>
+ <screenshot>
+ <screeninfo>Using DHIS GIS Module to get the map center point</screeninfo>
+ <mediaobject>
+ <imageobject>
+ <imagedata width="80%" align="center" fileref="resources/images/GIS/dhis_gis_center_point.png"/>
+ </imageobject>
+ </mediaobject>
+ </screenshot>
+ </listitem>
+ <listitem>
+ <para><guilabel>Zoom:</guilabel> The zoom level controls the extent of the map. Some
+ experimentation will be required to get the correct zoom level.
+ Start with a value of "7" and increase or decrease the zoom level
+ depending on the extent of the map that should be displayed.</para>
+ </listitem>
+ </itemizedlist>
+ </section>
+ <section id="gisMapOrganisationUnitRelation">
+ <title>Assign organization units to map</title>
+ <para>Select a registered map and wait for it to load. The organisation
+ units (OU) in your database on this level will appear in the list and
+ colors will appear in the map. What we want to do here is creating
+ relations between OUs in the database and the corresponding OUs in the
+ shapefile. This is often necessary because of inconsistencies in the
+ naming in the geographical data, and what is present in the DHIS database.
+ First, try auto-assign at the bottom toolbar to let the application link
+ the OUs with a matching OU name in the shapefile. The polygons that remain
+ white, you will have to link manually by first selecting a white OU in the
+ list and then click the corresponding OU in the map.</para>
+ <screenshot>
+ <screeninfo>Assigning Organizational Units to the map</screeninfo>
+ <mediaobject>
+ <imageobject>
+ <imagedata width="80%" align="center" fileref="resources/images/GIS/assign_org_units.png"/>
+ </imageobject>
+ </mediaobject>
+ </screenshot>
+ <para>The remove button at the button tool bar removes the selected OU’s
+ link. The remove all button removes all OU links for the selected
+ map.</para>
+ </section>
+ <section id="gisOverlay">
+ <title>Register overlays</title>
+ <para>Overlays are geographical layers that do not have any direct linkage
+ to data in the database. Example include roads, rivers, airports, ports,
+ and other geographical information that you may want to display on your
+ map, but that is not neccsarily linked ot data contained in the DHIS
+ database. The <guimenu>Register Overlay</guimenu> panel will allow you to
+ add new layers and determine how they will be represented visually on the
+ map. </para>
+ <itemizedlist>
+ <listitem>
+ <para><guilabel>Display name: </guilabel>Represents your overlay in
+ the layer tree in the upper right corner.</para>
+ </listitem>
+ <listitem>
+ <para><guilabel>Map source file: </guilabel>The GeoJSON file
+ name.</para>
+ </listitem>
+ <listitem>
+ <para><guilabel>Fill color: </guilabel>Decides the fill color if the
+ layer is a polygon layer. </para>
+ </listitem>
+ <listitem>
+ <para><guilabel>Fill opacity: </guilabel>Select an opacity level
+ between 0 (invisible) and 1 (solid).</para>
+ </listitem>
+ <listitem>
+ <para><guilabel>Stroke color: </guilabel>The stroke color over lines
+ and polygon borders.</para>
+ </listitem>
+ <listitem>
+ <para><guilabel>Stroke width: </guilabel>Select a stroke width between
+ 0 and 4.</para>
+ </listitem>
+ </itemizedlist>
+ </section>
+ <section id="gisThematicMap">
+ <title>Thematic map</title>
+ <para>This panel lets you use your registered maps for thematic mapping. All you need to do is selecting your desired indicator-period-map combination in the left side menu.</para>
+ <para>Calculation method
+ alludes to the size of the legend classes. Set to <guimenuitem>Equal intervals</guimenuitem> they will be “highest map value – lowest map value
+ / number of classesâ€. Set to <guimenuitem>Equal group count</guimenuitem> the legend creator will try to distribute the organisation units evenly. Choose <guimenuitem>Fixed bounds </guimenuitem>and
+ you may define your own class break values, e.g. “20,40,60†using a comma to
+ seperate each of them.</para>
+ <para>The map view combo box lists all map views (favorites) saved by the user. The settings that are stored in the map view will be automatically applied to the thematic map panel.</para>
+ </section>
+ <section id="gisFavoriteMapView">
+ <title>Register favorite map views</title>
+ <para>This window will save the current thematic map view in order to
+ restore it whenever you want via the <guimenuitem>map view</guimenuitem> combo box in the <guimenu>thematic map</guimenu> panel. By
+ adding your views to DHIS 2 Dashboard you may access them there by
+ inserting <guimenuitem>map views</guimenuitem> into one of the link
+ areas.</para>
+ </section>
+ <section id="gisLegendSet">
+ <title>Register legend sets</title>
+ <para>A legend set may be connected to many indicators, but an indicator
+ may only have one legend set. Thus, you may select many indicators when
+ you create a legend set. When an indicator that has a legend set is
+ selected in the <guimenu>thematic map</guimenu> panel, the number of
+ classes, low color and high color is automatically set.</para>
+ </section>
+ <section id="gisPdfPrint">
+ <title>Print map as PDF</title>
+ <para>Click the PDF icon on the map toolbar and the left side print panel will open. You may add several pages to your PDF document by clicking the "add page" button on the bottom toolbar. Change the size of the focus rectangle in the "scale" column. The rectangle can be rotated by inserting a number (degrees) "rotation" column or by dragging the rotation knob. Your "map title" and "comment" will appear above and below the picture in the PDF document respectively. The higher "dots per inch" value you choose, the better quality of the image and the larger file size of the document.</para><para>To get out of print mode you can simply expand a different panel or hide the print panel by clicking the PDF icon on the map toolbar again.</para>
+ </section>
+</chapter>
