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The background maps to be displayed are defined in the geoMap element. This is an XML implementation of the OpenMap configuration described also in Appendix C for configuring the main map display (in time this will also be done using the geoMap element).

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Figure 146 Elements of the geoMap configuration
The more advanced options are described below. Rather straightforward options like northArrowVisible are self explaining.

description

Optional description of the configuration. Used for reference purposes only.

extents

Root element for the definition of a zoom extent. The extents defined will appear in a drop down list in the grid display.

geoDatum

Coordinate system the extents are defined in. Enumeration of available coordinate systems is available in Appendix B.

defaultExtent

Definition of the default zoom extent.

Attributes;

name : name of the default zoom extent (displayed in the drop-down list)
extraExtent

Definition of the additional zoom extents. Multiple entries may exist.

Attributes;

name : name of the zoom extent (displayed in the drop-down list)
left, right, top, bottom

Coordinates of the zoom extent. Note that in displaying the maps for the extent defined, the map display will be scaled to fit the extent in the current display window.

wfsConnection

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Notice that you need to specify a mapLayersCacheDir in the global.properties, like mapLayersCacheDir=%REGION_HOME%/MapCache

More info on connection to ArcSDE and WFS can be found here.

arcSdeConnection

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Notice that you need to specify a mapLayersCacheDir in the global.properties, like mapLayersCacheDir=%REGION_HOME%/MapCache

More info on connection to ArcSDE and WFS can be found here.

serverShapeLayer

To make use of a Wfs or ArcSDE connection you have to use the option for serverShapeLayer.

This layer supports some extra shape layer elements:

visible: Controls if the layer is automatically visible. When false the user has to switch on the layer manually. By default the layer becomes automatically visible

usedBySelectByMapItemTool: Controls if the layer is used by the "Select by map item tool" in the FEWS explorer to easily select all locations in a polygon.

selectByMapItemLocationRelation: When this element is specified an location relation is used to find locations at the map instead of the polygon border.
selectByMapItemAttributeEquals: When this element is specified a (multivalued) location attribute is used to find locations at the map instead of the polygon border.
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openStreetMapLayer

To make use of a server that uses the open street map protocol

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<openStreetMapLayer id="Osm">
<url>http://tile.openstreetmap.yourserver.com</url>
<cacheDir>$REGION_HOME$/OsmTiles</cacheDir>
</openStreetMapLayer>

For testing purposes you can use "http://tile.openstreetmap.org"

wmsLayer

To make use of a WMS server you have to use the option for wmsLayer.

url : Base url for the wms server. This is everything before the text "VERSION=" in the url. Use & to include a &
layer name : Layer name to display. It's the part after the text "LAYERS=" till the next & or ; in the url. To find the layer names enter the url that ends withs "request=GetCapabilities" in a browser.

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<wmsLayer id="aerial">
    <url>http://gdsc.nlr.nl/wms/lufo2005?</url>
	<wmsLayerName>lufo2005-1m</wmsLayerName>
	<cacheDir>$REGION_HOME$/wms_areal_cache</cacheDir>
</wmsLayer>

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<wmsLayer id="meteosat">
   <url>http://geoservices.knmi.nl/cgi-bin/METEOSAT9_DEMO.cgi?&amp;SERVICE=WMS&amp;</url>
   <wmsLayerName>IR108</wmsLayerName>
   <cacheDir>$REGION_HOME$/wms_meteosat_cache</cacheDir>
</wmsLayer>

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<wmsLayer id="HIRMLAM temperature">
    <url>http://geoservices.knmi.nl/cgi-bin/HIRLAM_DEMO.cgi?&amp;SERVICE=WMS&amp;</url>
    <wmsLayerName>2011-05-26T18:00:00Z/HIRLAM-temp/HIRLAM-temp-2m</wmsLayerName>
    <cacheDir>$REGION_HOME$/wms_hirlam_cache</cacheDir>
</wmsLayer>

Code Block

title	Demo Publieke Dienst op de kaart (PDOK)

<wmsLayer id="ahn2">
	<url>http://geodata.nationaalgeoregister.nl/ahn2/wms?service=wms&amp;request=getcapabilities</url>
	<wmsLayerName>ahn2_5m</wmsLayerName>
	<cacheDir>$REGION_HOME$/ahn2_5m</cacheDir>
</wmsLayer>

esriShapeLayer

This layer supports some extra shape layer elements. See the serverShapeLayer for a description.

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In this section the location of the background shape file can be defined.

id : Id of the background map
description : optional name of the backgroundmap
file: path to the shape file
visible: whether the layer is visible (true or false)
tooltip : information that is displayed when the user is moving the mouse cursor over a shape. To see this information turn on the 'Information' button.
lineColor : color of the line
fillColor : color of the area
opaquenessPercentage: percentage of opaqueness.
lineWidth : width of the line
pointSize or pointIconId: allow size adjustment of points in an ESRI shape-layer, resp. displays an icon (as defined in LocationIcons.xml) at the points in the ESRI shapelayer (Notice: add filename extension!)

An example of the various options, that can be completely mixed is shown in the below picture.
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Since 2017.02 for esriShapeLayers containing points, class breaks are allowed to use icons instead of colors. If both class breaks containing icons and a pointIconId is specified, the pointIconId is used as a default when no class break applies. A config example is shown below.

Code Block

title	Example config for using class breaks with icons for esriShapeLayer containing points

<esriShapeLayer id="myPointLayer" name="Some Points">
	<file>myPointLayer.shp</file>
	<pointIconId>default_icon.gif</pointIconId>
	<classBreaksAttributeName>ICON_ATTRIBUTE</classBreaksAttributeName>
	<classBreaks>
		<break lowerValue="0" label="low" icon="green_circle.gif"/>
		<break lowerValue="1000" label="high" icon="blue_square.gif"/>
	</classBreaks>
</esriShapeLayer>

coverageTileArchiveLayer

Since 2013.01 FEWS enables using a compressed grid file for your DEM. The compression is done per scale and in tiles and archived in a zip file, pretty similar as openStreetMap works.
You can prepare a CTA (coverage tile archive) with the F12 menu in the explorer (F12 -> convert -> convert ascii grid to coverage tile archive).
As the resulting file should be in meters (see below why) you may need to specify a conversion factor from eg. centimeter to meter. You can also define an accuracy of the compressed values. Normally centimeter accuracy is more than enough, sometimes you can easily go to decimeters, which compresses much better of course. For synchronization reasons you may want to split the resulting file in parts of e.g. max 2 GB. Usually this is more than enough. The resulting compression is generally a factor of about 10-20. But the main reason is the much better performance of the GUI as per pixel is already determined which value should be plotted.

A very useful additional feature (to be used in the griddisplay only) is the feature that you can use the CTA as a real DEM and use it for plotting of water depths.
You then can easily display the water depths per pixel, based on a time series with water levels (using global datum!) and the DEM in the CTA. Therefore, enable the property useAsLocalDatumReference. Note, usesDatum in Parameters.xml for the respective parameterGroup should be set "true". The waterlevels can have any spatial distribution, like grid or polygon and should not have the exact same grid definition as the DEM. The calculation of the depths is completely on the fly and no depths have to be stored in the database.

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<coverageTileArchiveLayer id="asc">
  <file>petten.cta</file>
  <visible>false</visible>
  <useAsLocalDatumReference>false</useAsLocalDatumReference>
  <classBreaks>
    <lowerColor>brown</lowerColor>
    <upperColor>green</upperColor>
    <lowerValue>-4</lowerValue>
    lowerValue>-1</lowerValue>
  </classBreaks>
</coverageTileArchiveLayer>

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<gridPlot id="Petten">
  <timeSeriesSet>
    <moduleInstanceId>Floodmap</moduleInstanceId>
    <valueType>grid</valueType>
    <parameterId>H.sim.hist</parameterId>
    <locationId>Floodmap_grid</locationId>
    <timeSeriesType>simulated historical</timeSeriesType>
    <timeStep unit="minute" multiplier="1"/>
    <readWriteMode>read only</readWriteMode>
  </timeSeriesSet>
  <classBreaks>
    <break lowerValue="0" color="light blue" opaquenessPercentage="25"/>
    <break lowerValue="1" color="blue" opaquenessPercentage="75"/>
    <break lowerValue="2" color="purple" opaquenessPercentage="75"/>
  </classBreaks>
  <geoMap>
    <geoDatum>Rijks Driehoekstelsel</geoDatum>
    <projection>mercator</projection>
    <defaultExtent id="Petten testmodel">
      <left>-1000</left>
      <right>10000</right>
      <top>4000</top>
      <bottom>0</bottom>
    </defaultExtent>
    <extraExtent id="Nederland">
      <left>-200000</left>
      <right>500000</right>
      <top>750000</top>
      <bottom>200000</bottom>
    </extraExtent>
    <scaleBarVisible>true</scaleBarVisible>
    <northArrowVisible>true</northArrowVisible>
    <labelsVisible>true</labelsVisible>
    <backgroundColor>light blue1</backgroundColor>
    <openStreetMapLayer id="osm" name="Open Street Map">
      <url>http://tile.openstreetmap.org</url>
      <cacheDir>$MAP_CACHE$/openstreetmaps</cacheDir>
    </openStreetMapLayer>
    <coverageTileArchiveLayer id="asc">
      <file>petten.cta</file>
      <visible>false</visible>
      <useAsLocalDatumReference>true</useAsLocalDatumReference>
      <classBreaks>
        <lowerColor>brown</lowerColor>
        <upperColor>green</upperColor>
        <lowerValue>-4</lowerValue>
        <lowerValue>-1</lowerValue>
      </classBreaks>
    </coverageTileArchiveLayer>
  </geoMap>
</gridPlot>

layer

Definition of a GIS layer to be displayed.

Attributes;

id : required id of the map layer- must be unique for the current geoMap element.
name : optional name of the map layer defined
description

Optional description of the map layer. Used for reference purposes only.

className

Name of the class used in displaying the map layer. A different class is required for different types of GIS data.

NOTE: Defining a class name allows advanced users to add additional display functionality to the OpenMap utility, and this being used in map displays in DELFT-FEWS. See the OpenMap documentation for details on how to add additional display classes.

visible

Boolean flag indicating if layer is visible by default.

properties

Definition of properties associated with the map layer to be displayed. Properties that need to be defined depend on the class used. At least one property must be defined. This may be a dummy property. Multiple entries may exist.

string

Definition of a string property. An example is the definition of the geoDatum for displaying shape files using the geoDatumDisplay class.

key

Key to identify the property

Value

Value of the property defined.

Note: when displaying a shape file layer that does not use WGS 1984 as the coordinate system, a property must be defined that defines the geo datum. To do this set the key value as "geoDatum" and define the coordinate system using the enumeration in Appendix B.

See below some examples of nice tile layers below. See also http://server.arcgisonline.com/ArcGIS/rest/services/

Code Block

language	xml
title	nice layers

<layer id="World" name="ArcGIS World_Topo_Map">
  <className>nl.wldelft.libx.openmap.GenericTileServerLayer</className>
  <properties>
    <string key="tileUrlPattern" value="http://server.arcgisonline.com/ArcGIS/rest/services/World_Topo_Map/MapServer/tile/%ZOOM%/%ROW%/%COLUMN%"/>
    <string key="cacheDir" value="%REGION_HOME%/mapcache/Esri_topo"/>
    <int key="minZoomLevel" value="1"/>
    <int key="maxZoomLevel" value="19"/>
    <int key="topZoomLevel" value="21"/>
    <int key="tileSize" value="256"/>
  </properties>
</layer>

<layer id="Canvas" name="ArcGIS Canvas World_Light_Gray_Base">
  <className>nl.wldelft.libx.openmap.GenericTileServerLayer</className>
  <properties>
    <string key="tileUrlPattern" value="http://server.arcgisonline.com/arcgis/rest/services/Canvas/World_Light_Gray_Base/MapServer/tile/%ZOOM%/%ROW%/%COLUMN%"/>
    <string key="cacheDir" value="%REGION_HOME%/mapcache/Esri_Canvas_World_Light_Gray_Base"/>
    <int key="minZoomLevel" value="1"/>
    <int key="maxZoomLevel" value="19"/>
    <int key="topZoomLevel" value="21"/>
    <int key="tileSize" value="256"/>
  </properties>
</layer>

<openStreetMapLayer id="Osm" name="Open Street Map">
  <url>http://tile.openstreetmap.org</url>
  <cacheDir>$REGION_HOME$/OsmTiles</cacheDir>
</openStreetMapLayer>

<openStreetMapLayer id="Osm" name="Open Street Map (Toner)">
  <url>http://tile.stamen.com/toner</url>
  <cacheDir>$REGION_HOME$/mapcache/stamen_toner</cacheDir>
</openStreetMapLayer>

More information on the configuration of the geoMap element can be found here.

Configuration (Example)

The following example shows how to configure a Meteosat image as grayScaleImage in the Grid display.

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Key

description

extents

geoDatum

defaultExtent

extraExtent

left, right, top, bottom

wfsConnection

arcSdeConnection

serverShapeLayer

openStreetMapLayer

wmsLayer

esriShapeLayer

coverageTileArchiveLayer

layer

description

className

visible

properties

string

key

Value

Configuration (Example)