What Are the Limitations of Satellite Data?

So you might be wondering why the United Nations World Food Programme needs a geospatial support unit. Let me give you a brief overview, 

Basically, they curate and maintain global datasets that they use to model the risk of sudden-onset disasters than might lead to a food security risk. They use this model to send out early warnings to at-risk communities and help with the response when disasters happen. 

Of course, there is more to it ...

But I will let Rohini Sampoornam Swaminathan ( The head of the Geospatial Support Unit at the UN World Food Programme)  explain it in more detail.

The Hunger Map

https://hungermap.wfp.org/

BeforeAfterMap OSM Before-After Maps is an online tool that allows anyone to easily compare how a particular area looked in terms of OpenStreetMap (OSM) data at two different years, side by side, and get a visual insight into mapping contributions over time.

https://beforeafter.baato.io/