Revision as of 12:30, 24 November 2020

Prepare sources for reference data collection

1. Load a LUC classification map of the Urban European Atlas for Göttingen in vector format. (Loading vector data)
2. Load Digital aerial Ortho Photos (DOP) published as "Google Satellite". (Load a WMS-Layer).
3. Load a multiband (B2,B3,B4,B5,B6,B7,B8,B8A,B11,B12) Sentinel-2 satellite image and display a false color composite (RGB = B8,B11,B5 =7,9,3). (Changing Raster Layer Style)

Create a new vector layer

1. Click the Add raster layer in the toolbar or choose Layer --> Add raster Layer
2. Navigate to the georeferenced DOP /geodata_w02/mavic_rgba_modified.tif. OK
3. Create a new vector layer:
4. Select Layer --> Create Layer --> New Geopackage Layer.
5. Define path and file name.
   • As Geometry type, select Polygon.
   • Click the Specify CRS button and select the Project CRS, e.g.: WGS84/UTM32N (EPSG:32632).
   • Adding an additional column in the attibute table:
     • For the attribute's name type Class into the Name field of the New attribute section.
     • Select Whole number (integer) as data type.
     • Confirm with Add to Fields List.

400px

Configure vector digitizing

1. Select Project --> Snapping options.
2. Activate Snapping clicking on the left button.
3. Change All Layers to Advanced Configuration
4. Activate one or several vector layers for which you wish to configure snapping.
5. Change Type from vertex to vertex and segment.
6. Choose Units meters.
7. Select the snapping Tolerance 0.2.
8. Activate the checkbox Avoid overlap.
9. Activate Topological Editing and Snapping on Intersection

Start digitizing

Digitize at least 10 training areas for each of Land cover class (C_ID) using the simplified classification scheme (s.below) and a MMU (minimum Mapping Unit) = 1600m2