labelingnatural-earthpolygonqgis
I am new to QGIS 3 and want to make a simple map of research area. I'm using Natural Earth and I've identified the "10m_admin_0_map_units" is the file with the country names.
I just want a few country names to appear on the map of the Caribbean e.g. Barbados, Curacao, Cuba, Venezuela, Mexico. But I can't work out how to set up the rule based layer for this and I can't find a tutorial using this Version.
Could someone explain how I set-up the filter to only get a few country names?
Click the little ... icon :)
Maybe I should rename it to "expression..."
The simple reason why QGIS can not draw these polygons is because some of the vertices are on the backside of the globe, and QGIS can not draw a closed polygon with the rest. The GDAL ogr2ogr function in the background is programmed to kick off the whole feature when such an error occurs.
So you have two solutions:
Solution 1: Clip your polygons to the hemisphere
You need Numerical Digitize and CAD Tools plugin for that.
x y 6370000 0 0 6370000 -6370000 0 0 -6370000
(should also work with Add delimited text layer)
You should get this picture:
Solution 2: Convert your vector data to raster
on-the-fly-reprojectionRaster -> Convert -> Rasterize on the WGS84 layer
select x=360 and y=170 as dimensions for the raster (or n*360 and n*170)Raster -> Projection -> Reproject to the ortho projection under another name and add it to the canvas. You will get some errors, but the rest of the raster will do. Don't bother that you see a grey rectangleyou should see the follwing picture:
The same method works with rasters, as you can see in my avatar picture ;-)
EDIT
To get a nice ortho projection centered on a point not on the equator, do the clipping in an aeqd projection with the same parameters as the ortho. You will get this result:
Best Answer
You should to use in Properties --> Label --> Rendering --> Show Label
Click on "Edit..." and add the next expresion:
"name" in ( 'Venezuela' , 'Cuba' , 'Mexico' )
This is the result