Tutorial: Process groundwater data in QGIS

5. Clip layers to study area boundaries

Now we have the study area boundary, we can clip all layers to those boundaries to further prepare our dataset.

We'll do that first for the Malawi_GIS_data Geology UTM layer.

1. In the main menu go to Vector | Geoprocessing Tools | Clip...

2. In the Clip dialogue choose Malawi_GIS_data Geology UTM as Input layer and Shire study area as Overlay layer. Save the Clipped layer to the Malawi_GIS_data.gpkg GeoPackage with the name Shire Geology.

Clip dialogue

3. Click Run. Click Close to close the dialogue after processing.

4. Copy the style from the Malawi_GIS_data Geology UTM layer to the Shire Geology layer as you have learned before in Section 2.

5. Uncheck layers that obstruct the result.

You'll now see the Geology in the study area.

Geology in the study area

6. Repeat steps 1 to 5 for the Malawi_GIS_data Hydrogeology UTM layer and name the output Shire Hydrogeology.

The result should look like the figure below.

Hydrogeology of the study area

This also works for the point vector layers.

7. Repeat steps 1 to 5 for ramsar_sites_malawi an save the output to Shire Ramsar sites.

8. Repeat steps 1 to 5 for groundwater_monitoring_wells an save the output to Shire groundwater monitoring wells.

The result should look like this with some shuffeling of layers.

Clipped point vector layers

9. Remove the layers that we don't need anymore from the Layers panel. We should only keep the following layers for the study area:

10. Save the project under a new name in the Malawi_GIS_data.gpkg GeoPackage. Name it Shire_groundwater. Remember to choose from the main menu Project | Save To | GeoPackage...

In the next section we're add the geology and hydrogeology attributes to the monitoring wells.