isobands and isolines from a geotiff with d3js

This exampe shows the temperature at 840 hPa and the geopotential height at 850 hPa from the GFS model (date 27/7/2016).

The idea is showing how to use the d3-marching-squares library as in the previous example, but adding isolines.

The colors represent the temperature and the lines the geopotential height. The example should have a scale, but the d3-legend library doesn't seem to work with d3 v4. The isolines should be labaled too, and this is a quite difficult task.

The example is created with npm and browserify, so if you want to play a little with it:

• Download the package.json, index.html and draw.js files
• run npm install
• change the things you want in the draw.js file
• run browserify draw.js > bundle.js

Now you can see the changed page.