Elevation POC

run docker-compose up in one terminal
add some elevation data to ./data, I've added:
- MEL2018_BC_33.flt
- MEL2018_BC_33.hdr
- MEL2018_BC_34.flt
- MEL2018_BC_34.hdr
- MEL2018_BC_35.flt
- MEL2018_BC_35.hdr
- MEL2018_BC_36.flt
- MEL2018_BC_36.hdr
- MEL2018_BC_37.flt
- MEL2018_BC_37.hdr
- MEL2018_BC_38.flt
- MEL2018_BC_38.hdr
- MEL2018_BC_39.flt
- MEL2018_BC_39.hdr
- MEL2018_BC_40.flt
- MEL2018_BC_40.hdr
run ./bin/seed in another terminal, this will load the elevation data
run ./bin/psql to get yourself access to psql
- eval procs.sql to [re]define the required functions
- eval the following to perform a LOS calculation

  SELECT los_range(
  ST_SetSrid(St_MakePoint(144.800244, -37.830869), 4326),
  ST_SetSrid(St_MakePoint(144.972303, -37.831201), 4326)
);

you can swap 4 lines in the top of los_range to compare the performance difference between a single-point SQ, and a raster SQ.

vwong / los