Incorporation of auxiliary data in SNAP?

Skylab · May 21, 2021, 11:54am

How new land cover data could be incorporated?; such as those from the GlobeLand30 (2000-2010-2020), of 30 m resolution and of 100 m resolution (https://lcviewer.vito.be/ ) for the years 2015 to 2019. It is very useful to have the information updated and to be able to make the subset according to the image analyzed within the SNAP.

marpet · May 21, 2021, 12:42pm

You are referring to the ‘Add Landcover Band’ function, right?

The add new data maps here, the source code needs to be changed, there is now public extension point available.

But in general you can use any landcover map and collocate it with your data in SNAP.

Skylab · May 21, 2021, 12:49pm

Exactly. Thank you very much for the quick answer. I have incorporated the data of the aforementioned websites in the aux data folder. But I don’t know how to change the codes to make them work.

marpet · May 21, 2021, 1:06pm

In general a LandCoverModelDescriptor like this one must be implemented:

github.com

senbox-org/snap-engine/blob/19e7c9b4a24665b979fffa1e7b4a9808ac7e42ae/snap-land-cover/src/main/java/org/esa/snap/landcover/dataio/glc2000/GLC2000ModelDescriptor.java#L29


import org.esa.snap.core.util.ResourceInstaller;
import org.esa.snap.engine_utilities.util.Settings;
import org.esa.snap.landcover.dataio.AbstractLandCoverModelDescriptor;
import org.esa.snap.landcover.dataio.FileLandCoverModel;
import org.esa.snap.landcover.dataio.LandCoverModel;
import java.io.File;
import java.io.IOException;
import java.nio.file.Path;
public class GLC2000ModelDescriptor extends AbstractLandCoverModelDescriptor {
    public static final String NAME = "GLC2000";
    private static final File INSTALL_DIR = new File(Settings.instance().getAuxDataFolder().getAbsolutePath(),
            "LandCover" + File.separator + NAME);
    private static final File file = new File(INSTALL_DIR, "glc2000_v1_1.zip");
    public GLC2000ModelDescriptor() {
        remotePath = "http://step.esa.int/auxdata/landcover/glc2000/";
        name = NAME;

For general guidance on the development with SNAP, take a look at our wiki:
SNAP development - SNAP - SNAP Wiki (atlassian.net)

I have just seen there is a public extension point.
Very briefly what needs to be done:
One could provide new maps by implementing (Abstract)LandCoverModelDescriptor and registering the implementation in META-INF/services/org.esa.snap.landcover.dataio.LandCoverModelDescriptor.

Skylab · May 21, 2021, 1:16pm

Thanks a lot, Marco. Now it is clearer to me how to do it. I will take into account all the suggestions and I will try.
Best regards,
Hector

marpet · May 21, 2021, 1:27pm

Feel free to ask again.
You can provide your own plugin ( SNAP Community Plugins – STEP (esa.int)) or you can provide us the code (Maybe a pull-request) and then it can be integrated into the SNAP Core.

Skylab · May 21, 2021, 1:32pm

It is very difficult for me to implement it due to my ignorance in the handling and creation of the codes. I am not familiar with github.com. But I will investigate how to do it.