MapQuery/OpenLayers based map. You have to define units, start and max. extent, scales and supported projections.
Title: Title of the element. The title will be listed in “Layouts” and allows to distinguish between different buttons. It will be indicated if “Show label” is activated.
Layersets: Refers to a layerset. Define the layerset first and refer to it.
DPI: Resolution, default is 72.
SRS: Spatial reference system. Two ways of SRS definitions are supported: EPSG: CODE or EPSG:CODE|MY SRS TITLE.
Tile size: Size of the tiles of tiled WMS services.
Max. Extent: Maximal map extent, defined by BBOX parameters.
Start Extent: Map extent that is visible at application launch. Defined by BBOX parameters.
Scales (csv): a csv scale list. These scales will be supported in your application if you zoom (e.g. via mouse wheel)
Other SRS: Other spatial reference systems. Two SRS definitions are supported: EPSG: CODE or EPSG:CODE|MY SRS TITLE.
The main map element is included in the content section of the application menu. A map element can be added with the
All layersets can be included in the main map element if they are set in the layersets tab in the application backend beforehand. For this example, those are the following:
The layersets are visible in the configuration dialog in the Layersets (1) section. It is possible to multi-select the desired layers. Unchecked layersets can be used in the overview element (as a overview map) later on.
The field SRS (2) defines the coordinate reference system that is used at application launch. In this example, the coordinate reference system ETRS89/ UTM Zone 32N was chosen. The affiliated ESPG-code is 25832. If the application should support other coordinate systems, simply add those in the Other SRS (6) field (enter the EPSG code). It is possible to enter several comma-separated codes. In this example, the following codes are used: 25833 (ETRS89/ UTM Zone 33N), 31466 (DHDN / 3-degree Gauss-Krüger Zone 2), 31467 (DHDN / 3-degree Gauss-Krüger Zone 3), 3857 (WGS 84 / Pseudo-Mercator) and 4326 (WGS 84). Switching between the registered coordinate systems works with the element “SRS Selector”. To get more details on the SRS selector, visit Scale Selector.
The field max. Extent (3) states the max. zoomable extent of the map application. If there is data outside of the extent, it cannot be seen by the frontend user. The field start Extent (4) refers to the extent of the map that is visible when the application is launched in the browser (in the example the city of Bonn).
The field scales (csv) (5) defines the scales that are usable in the application. This element can come handy if the user should e.g. see the map, but not too many details of it (just define no possibility to zoom closer than 1:10000). Moreover, it is possible to switch between the defined SRS’s with the element scale selector. For further details, view Scale Selector. Alternatively, this can be realized with the navigation toolbar element. For further integrational details see Navigation Toolbar (Zoombar).
layerset: null # refer to a layerset, define the layerset first and refer to it dpi: 72 # resolution, default is 72 srs: "EPSG:4326" # coordinate reference system. Two ways of srs definitions are supported: - "EPSG:CODE" or - "EPSG:CODE|MY SRS TITLE" units: "degrees" # units to use degrees/meters, default is degrees extents: max: [0, 40, 20, 60] # maximal map extents start: [5, 45, 15, 55] # map extents for the start of the application scales: "25000000,10000000,5000000,1000000,500000" # a csv scale list otherSrs: - EPSG:31466 - EPSG:31467 - EPSG:25832 # other coordinate reference systems. Two srs definitions are supported: - ["EPSG:CODE","EPSG:CODE"] or - ["EPSG:CODE|MY SRS TITLE","EPSG:CODE|MY SRS TITLE"] tileSize: 256 # size of tiles
Controlling by URL-parameters¶
Make Layer visible¶
If you have a layer with the id <layerid> in a service with the id <serviceid>, you may pass the URL parameter visiblelayers to turn the layer visible:
You may also pass multiple layers separated by comma.
The layerid and serviceid values are specific to an application. You can get the layerid and serviceid in the specific application, namely in the layerset and there in a layer. Each layer has an icon with three small dots on the right side. Click on the icon and a popup window will appear.
The first value lists the internal SourceID and SourceLayerId (31-591). The seconds value lists the InstanceID and InstanceLayerId that we want to use now (73-836).
Use this values for the “visibleLayers” parameter in your URL, and seperate them by a slash.
If you have two layers that are not visible by default, put the two values of layerid and serviceid into the URL and seperate them by a comma.
You can pass one or more POIs in the URL. Each POI has the following parameters:
point: coordinate pair with values separated by comma (mandatory)
label: Label to display (optional)
scale: Scale to show POI in (optional, makes only sense with one POI)
If you pass more than one POI, the map will zoom to 150% of the POIs bounding.
To pass a single POI, use the following URL format:
To pass multiple POIs, use the following format:
You can pass a BBOX to zoom to by using the following URL query parameter:
Passing the scale¶
You can set the scale from the list of available scales.
You can pass a favorite EPSG code you want to use on start of the application by URL query parameter:
You can pass a coordinate. The application will open and display the coordinate in the center. In this case, you also have to set the SRS.
More Start Parameters¶
The elements WMS Loader and WMC Loader also provide parameters you can use on start. Have a look at the element descriptions for further information.
Class, Widget & Style¶