This element is used to configure the background maps to be displayed.
Figure 146 Elements of the geoMap configuration
The more advanced options are described below. Rather straightforward options like northArrowVisible are self explaining.
Contents:
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
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
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.
openStreetMapLayer
To make use of a server that uses the open street map protocol
<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.
<wmsLayer id="aerial">
<url>http://gdsc.nlr.nl/wms/lufo2005?</url>
<wmsLayerName>lufo2005-1m</wmsLayerName>
<cacheDir>$REGION_HOME$/wms_areal_cache</cacheDir>
</wmsLayer>
<wmsLayer id="meteosat"> <url>http://geoservices.knmi.nl/cgi-bin/METEOSAT9_DEMO.cgi?&SERVICE=WMS&</url> <wmsLayerName>IR108</wmsLayerName> <cacheDir>$REGION_HOME$/wms_meteosat_cache</cacheDir> </wmsLayer>
<wmsLayer id="HIRMLAM temperature">
<url>http://geoservices.knmi.nl/cgi-bin/HIRLAM_DEMO.cgi?&SERVICE=WMS&</url>
<wmsLayerName>2011-05-26T18:00:00Z/HIRLAM-temp/HIRLAM-temp-2m</wmsLayerName>
<cacheDir>$REGION_HOME$/wms_hirlam_cache</cacheDir>
</wmsLayer>
<wmsLayer id="ahn2"> <url>http://geodata.nationaalgeoregister.nl/ahn2/wms?service=wms&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.
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.
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.
<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.
<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>
<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/
<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>
