Feature/mwi arc2 chirps compare

[caldwellst]

Hey @hannahker, here's some of the initial work on comparing ARC2 and CHIRPS data. It primarily is composed of:

• exploration/compare_arc_chirps.md which I should rename, as was initially going to be comparison, but decided to use .Rmd for comparison and just left this for data processing. Will be expanded once we have new ARC2 raw data.
• exploration/compare_arc_chirps.Rmd where I'm going to put all the comparisons and its knitted .html file.
• 12_arc2_identify_dry_spells.md simple change to downsample raw raster data rather than rolling sum.

I will be updating these once new data is available and can calculate based on the method used for CHIRPS, but you can find the two different ARC2 dry spell data (you're already using the centroid one):

• public/exploration/mwi/arc2/mwi_arc2_dry_spells.csv
• public/exploration/mwi/arc2/mwi_arc2_touching_dry_spells.csv

You can also find those same files filtered to CHIRPS dry spells, but not necessary for trigger comparison.

[hannahker]

A quick note that you might want to merge in the main develop branch as we've recently refactored the malawi directory to mwi.

[caldwellst]

Okay, have gone through all the data and analysis to confirm that the joins between datasets is correct. Will put all relevant information into the Powerpoint.