Add to leaflet the ability to pull a box over the grump population layer. This box will capture the lat and long of the box. Then leaflet/php or Python will sum up all of the pop values in the box and return to the user the population sum.
Add to leaflet the ability to pull a box over the grump population layer. This box will capture the lat and long of the box. Then leaflet/php or Python will sum up all of the pop values in the box and return to the user the population sum.