What you see then should look something like this. Cick run and close the window when the operation is completed. Select Vector -> Geoprocessing Tools -> Intersection.Īs the input layer select the polygon and as the overlay layer select the grid that you created in the previous step.

Now we intersect the grid with the polygon to get the final grid inside the polygon shapes.

See the picture in the next section of what the result should look like. This automatically takes the bounding box of the polygon layer and creates a grid in this bounding box. In the Grid extent section select Calculate from layer -> the polygon layer you added. Select Rectangle as the grid type and define the horizontal and vertical spacing size. To create the grid, go to Vector -> Research Tools -> Create Grid. To turn the polygon into a grid, you have to create a grid on top of the polygon, and then intersect it's lines. The polygons are counties and special administrative regions in North Korea. In this image I'm not using one polygon but several polygons from a feature collection. Now you have a layer with a random color as shown below. Make sure the layer is set to the correct projection. If you don't have any geojson file then you can also manually create a layer and draw a polygon of course. This will automatically create a new layer with the right projection. Then select OpenStreetMap and press Add.ĭrag your geojson file into the section at the red arrow. Go to Layer -> Data Source Manager and in the left menu scroll down to XYZ. Add an OpenStreetMap base layer for reference The polygons used in this example are exported from Overpass Turbo, the OpenStreetMap querying tool.

In other words, I had to create a raster or grid inside the polygon so that the tasks wouldn't be too big to handle. For the Mapping North Korea project I had to split a region into smaller sectors.

Split picture into grid