Files currently created by poorly written jupyter notebook
~u0035056/ebus/mobile_aq_proc.ipynb

Description of monthly csv formatted files containing  ebus observations combining all buses and georeferencing aggregated on a .01 latitude-longitude grid (~1100 m). This may be changed "soon" to match the level 3 .0005 (~550 m) grid.

There are separate files for each month.  The objective is to have files that integrate all observations into one file. 
reject median observations when one or more flags are tripped.  

File location from CHPC:
/uufs/chpc.utah.edu/common/home/horel-group8/horel/meop/level2/YYYY

File location externally:
https://horel.chpc.utah.edu/data/meop/level2/YYYY
ebus_YYYY_MM.csv

times,BUS,LAT,LON,ELV,ROW,COL,GSP,GDR,BSP,BDR,BTT,BTRH,PM1,PM2.5,PM4,PM10,PRHI,O3,PMF,O3F,BGPF,BSPF
2024-07-01 07:23:20,1,40.762287,-111.909752,1287.3,312,290,0.0,0.0,,,22.3,36.0,,,,,,,0,0,1,
2024-07-01 07:23:25,1,40.762283,-111.909752,1286.3,312,290,0.0,0.0,0.1,180.0,22.3,36.0,,,,,,,0,0,1,1
2024-07-01 07:23:30,1,40.762283,-111.90976,1285.9,312,290,0.0,0.0,0.1,270.0,22.3,36.0,,,,,,,0,0,1,1
2024-07-02 13:32:35,1,40.76228,-111.909752,1295.3,312,290,0.0,0.0,0.0,116.0,17.0,35.0,,,,,,,0,0,1,1
2024-07-02 13:32:40,1,40.762272,-111.909752,1296.3,312,290,0.0,0.0,0.2,180.0,17.0,35.0,,,,,,,0,0,1,1
2024-07-02 13:32:45,1,40.762268,-111.90976,1296.5,312,290,0.0,0.0,0.2,237.0,17.0,35.0,,,,,,,0,0,1,1
2024-07-02 13:32:50,1,40.762268,-111.90976,1297.5,312,290,0.0,0.0,0.0,0.0,17.0,35.0,,,,,,,0,0,1,1

Variables. 
    times: YYYY-MM-DD HH:mm:SS   LOCAL TIME
    BUS: Bus #
    LAT: Latitude 
    LON: Longitude
    ROW,COL: location in the Salt Lake Valley defined by index values within a 91x100 0.005 resolution lat-lon grid
    	ROW is longitude and COL is latitude. Further Grid information included below
    GSP: Onboard GPS-derived vehicle speed (m/s)
    GDR: Onboard GPS-derived direction (deg) 
    BSP: Vehhicle speed calculated from successive LAT/LON observations (m/s)
    BDR: Vehicle direction calculated (deg)
    BTT: External air temperature (C) inside radiation shield on top of vehicle. 
        Exterior temperature in non-aspirated shield (may read higher than environment if bus not moving)
    BTRH: External relative humidity (%) inside radiation shield on top of vehicle. PM may read heigher than environment if TRH high (> 80%)
    PM1: PM2.5, PM4, PM10. Particulate concentrations of differing sizes (ug/m^3). 
         Particulate sensors installed vary over time. PM2.5 concentrations are typically available
    PRHI: RH inside particulate sensor. When sensor detects RH > 35%, then heater turned on to attempt to maintain that RH. 
        That often leads to PM concentration oscillations in moist environments as the heater cycles on/off to maintain that sensor RH
    O3: ozone concentration (ppb)
    PMF: Particulate concentration flag: 0- less likely to have issues for all obs; 1+- count of high RH (> 80%) likely to create issues or possibly low flow rate
    O3F: Ozone concentration flag flag: 0- less likely to have issues for all obs; 1+- count of issues including low flow rate 
    BGPF: GPS flag: 0 likely to be outside depot area; 1+ count of obs located within Bus Depot area
    BSPF: Speed flag: 0 likely to be moving for all obs: 1+ count of observations with bus speed < 1 m/s


Corner coordinates of the grid are as follows:
    bot_left_lat  = 40.45
    bot_left_lon  = -112.20
    top_right_lat = 40.95
    top_right_lon = -111.75

Companion csv files provide the longitude and latitude for each of the 91x100 grid squares
    longitude_01.csv
    latitude_01.csv