3. Accessing WaPOR V3 Data
Now we have loaded the study area polygon in the QGIS map canvas, we can proceed with downloading WaPOR data with the WaPLUGIN.
1. Open the WaPLUGIN dialog from the main menu (Plugins | WAPlugin | Water Accounting and Productivity Plugin) or by using the 
icon in the toolbar.
2. Go to the WaPOR3
Catalog tab.
3. In the Workspace
dropdown, select WAPOR-3.
For this tutorial, you will
need to download the following three datasets:
- Actual Evapotranspiration and
Interception (AETI)
- Transpiration (T)
- Net Primary Production (NPP)
Since the Oued Hellal region
has Level 3 data available at 20m resolution, select Level
3 (20m) for the highest resolution and we'll use Dekadal data.
Most agricultural plots have
a start and end season that varies by region and crop. For this tutorial use:
- Start of season: 01 October 2022
- End of season: 30 April 2023
4. In the Mapset
dropdown, select Actual Evapotranspiration and Interception (dekadal -
20m).
5. Set the time frame for the
season:
- Time Frame From: 01 October 2022
- Time Frame Until: 30 April 2023
6. In the Coordinate
Selection section, choose Shape File.
- From the dropdown, select the
vector file corresponding to your study area (Oued_Hellal).
7. Change the output path
to a new folder on your computer (e.g., Waplugin_workshop).
8. Add a prefix to the layer
name for organization (e.g., “WH” for Oued Hellal).
9. Click on Download and
wait for the progress bar to complete.
- Since the study area is small,
the download time should be short.
- Note: The larger the study
area or higher the resolution (L3), the longer the download will take.
9. To verify the download, go to
the Raster Load Section.
10. Change the Raster Load
path to the Waplugin_workshop folder you created earlier.
11. Click Refresh, and all
downloaded layers should appear in the dropdown menu at Available Data.
12. To visualize one of the
downloaded layers, select it from the dropdown and click Load in Canvas.
- The raster layer will now
display in your project canvas.
13. Repeat the same procedure for
downloading the Transpiration and Net Primary Production (NPP)
rasters:
- Go back to the WaPOR V3
Catalogue tab and select Transpiration (dekadal - 20m) and Net
Primary Production (dekadal - 20m) from the Mapset dropdown.
- Use the same time frame,
coordinate selection (using the oued_hellal shapefile), and output
path (Waplugin_workshop).
Now we've downloaded all necessary data, we'll aggregate it to seasonal data.
