Proportional bivariate map

[ebocher]

Existing conformance classes required for this use case:

Example stylesheet:

Below a CSS encoding to describe a proportional symbol map with a color for each Local Climate Zones type filtered to represent a climate aleas.

*{
 [LCZ_PRIMARY != 104]{
   stroke: grey;
   stroke-width: 1px;
 }
 [SUM_POP>0] {
    geometry: centroid(the_geom);
    mark:   symbol(circle);
    mark-size: [Interpolate(
         SUM_POP,
         0, 10,
         30, 20,
         84, 100,
         'numeric',
         'linear')];
 };
 /* @title high climate risk */
 [LCZ_PRIMARY = 1],
 [LCZ_PRIMARY = 2],
 [LCZ_PRIMARY = 3],
 [LCZ_PRIMARY = 10],
 [LCZ_PRIMARY = 105]{
   :mark{
     fill: red;
   }
 };

 /* @title moderate climate risk */
 [LCZ_PRIMARY = 4],
 [LCZ_PRIMARY = 5],
 [LCZ_PRIMARY = 6],
 [LCZ_PRIMARY = 7],
 [LCZ_PRIMARY = 8],
 [LCZ_PRIMARY = 9]{
   :mark{
     fill: orange;
   }
 };

 /* @title low climate risk */
 [LCZ_PRIMARY = 101],
 [LCZ_PRIMARY = 102],
 [LCZ_PRIMARY = 103],
 [LCZ_PRIMARY = 106],
 [LCZ_PRIMARY = 107]{
   :mark{
     fill: green;
   }
 };
 }

Describe any capability not already addressed by existing conformance classes:

**Example image illustrating the portrayal use case:***