schwartz_grid_lookup

given a lat/lon coordinate, this DeGAUSS container returns a site_index and a sitecode, which are values specifying the nearest “grid” centroid point for the Schwartz spatiotemporal pollutant models

DeGAUSS example call

docker run --rm -v $PWD:/tmp degauss/schwartz_grid_lookup:0.4.1 my_address_file_geocoded.csv

geomarker methods

the red dot below is the query point
its surrounding box is what is was geohashed to (precision = 6)
h2 geohashes are used to quickly determine nearby points; this also provides an index to download and extract spatiotemporal exposure estimates (see more details here: https://s2geometry.io/)
neighboring boxes are added
schwartz “grid” points that are geohashed within these boxes are extracted
the index of the point closest to the query point, based on the great circle distance, is returned (highlighted in green)

example_schwartz_lookup

geomarker data

script relies on s3://geomarker/schwartz/schwartz_grid_geohashed.qs, which is made by running 01_geohash_schwartz_grid.R on s3://geomarker/schwartz/USGrid_Sites_1km_20200618.csv