Exposure datasets: migrate to other sources

[matamadio]

As exposure indicators, we are currently using:

• Worldpop for population
• World Settlement Footprint for built-up
• ESA for land cover (agri land)

Worldpop has shown it's limitations in several occasions across CCDR analytics, in both terms of pop distribution and total value. WSF is great at 10m res, but underfunded and with uncertain developments - the connected pop dataset doesn't seem to come soon. Moreover, the two datasets are independent from eachother, bringing sometimes unaligned exposure results for the two indicators.

Meanwhile, GHS (by JRC) has updated its data offer, with better resolution, new height/volumetric buildings data, new popolation layers, etc. It also offers projections up to 2030! I think it will ultimately offer a more consistent analysis, and sure it seems more future-proof than what we are relying on now.

[matamadio]

Confirmed moving to the latest GHS for populantion AND built-up (area, volumes, height). Keep ESA for land cover.