WCS Client Application Layers¶

Task¶

In this exercise, you will connect to various services for exchanging geodata over the internet.

WMS (Web Map Service) and WFS (Web Feature Service) are international standards for exchanging electronic maps over the internet. Data is transferred by the client machine connecting to a WMS or WFS server. WMS uses common image formats for the map itself, while WFS transfers data using the GML format.

This exercise assumes you have completed Exercise 1.3.

Solution Proposal¶

See our YouTube channel Construction by Volue for a quick walkthrough of the exercise.

Open Project¶

Start Gemini Terrain and switch to the project KO10 if the project menu shows a different project.

Open Drawing¶

In this exercise, we use the drawing 001 Project Data.

Select the drawing KO104001 Project Data in the project menu. Click Open.

This opens the drawing with menus for the terrain model.

Create Application Layer for WMS¶

Activate the tab for Application Layer in the vertical list field.

Right-click in the window.

Select Create... in the menu that appears.

Create WMS layer

Check WMS Client and enter WMS as the layer name. Click OK.

Select WMS service

Accept the default choice for WMS service: https://openwms.statkart.no/skwms1/wms.fkb?

Tip

The list contains several commonly used WMS services. You can find other free services on GeoNorge's website.

Click OK.

The WMS data is now displayed together with the vector data. Note that this may take some time. The application layer is shown with its own icon in the list.

Application layer list with WMS

Tip

You can combine several WMS services. If you use a WMS service that does not cover the entire model area, the uncovered areas will be transparent, allowing underlying background images to show through.

Create Application Layer for WFS¶

Select Create... in the quick menu for the application layer list.

Check WFS Client and enter WFS Property Parcel as the layer name.

Click OK.

Click WFS... in the tab for application layers.

WFS application layer properties

Accept the default service.

Click Fetch.

Select the layer app:Teig.

Click OK.

Properties are now temporarily downloaded within the terrain model area (data is loaded each time you open the drawing or change the area).

Since this is a WFS service, vector data with properties becomes available. You can click on the data to view geometry and properties, just like in a standard application layer.

WFS data

Create WCS Application Layer¶

Similarly, you can create a WCS application layer. The Kartverket service is the default choice and offers an elevation model directly as a streaming service.

Note

WCS (Web Coverage Service) is especially useful for retrieving raster data, such as elevation models.

You have now finished the exercise and can either continue with the next exercise or exit the program.

Closing the Drawing¶

Select File - Close.

Answer Yes to save the drawing.

This closes the window and opens the project menu.

Exiting the Program¶

Select File - Exit.

Answer Yes to save.

This closes the project and exits the program.