grassqgisqgis2threejs
I'd like to make a 3D population density map about a country.
I've got all of the population data of the towns and villages etc. and I've got shp about these areas.
I'd like to make a map like this:
I tried to do this with QGIS ThreeJS plugin. This is the result:
I'd like to add state vector layer above the 3D layer. Is this possible with that plugin?
Can somebody tell me what tool could I use to do this?
You'll need to join the tabular data to a shapefile of the world's political boundaries, based on a common field (preferably, a 3 letter ISO code). You can download such a layer here
For more help on join or tabular join as it is sometimes called, you can search gis.stackexchange, or general GIS manuals.
After the join operation, you can style and symbolize the resulting map based on the population density value for each country polygon, to create a coropleth map/
The issue is that the fields have different names in each layer, so QGIS creates a separate set of fields for each layer.
Slow method: rename the fields in the original layers
You could fix the issue by renaming the fields in the original layers (eg, change "SwedenPo_1" and "GermanyP_1" to "Field_1" or "CountryName"). To do this, open the layer properties, go to source fields, turn on layer editing, double-click on the name of each field and change it. This is pretty slow, because you have to repeat for each field in every layer.
Fast method: change the names in the combined layer
A much faster method is to change the names in the combined layer, using the Field Calculator. The individual steps are a bit longer, but you only have to do it once for each field.
For text columns, use the concat() and replace() functions. This will concatenate all the field values together into one string, then remove any zeros.
replace( concat("SwedenPo_2", "GermanyPo_2", ...),'0','')
For numerical columns, use the max() function. This will choose the largest value from the list of values, so if only one field has a value greater than 0 it will choose that one.
max("SwedenPo_4", "GermanyPo_4", ...)
Alternatively, the sum() function would work just as well as max() for this dataset.
Repeat for all fields. Delete the original fields.
Best Answer
Yes it is possible to add a vector layer. You need to load both and select them at the in the plugin menu.