IMPROVE Aerosol RHR Metrics II (2003 Guidance), Annual Group Means
Output file example (excerpt):
SiteCode|POC|FactDate|ParamCode|MethodID|Units|FactValue|HGroup|Status|good_year|TypeCode|Number_obs|ss_rayleigh
ACAD1|1|2021-01-01|aerosol_bext|1010|1/Mm|6.79987|10|V0|1|ANN|23|12
ACAD1|1|2021-01-01|aerosol_bext|1010|1/Mm|10.74653|30|V0|1|ANN|23|12
ACAD1|1|2021-01-01|aerosol_bext|1010|1/Mm|13.6559|50|V0|1|ANN|25|12
ACAD1|1|2021-01-01|aerosol_bext|1010|1/Mm|19.87809|70|V0|1|ANN|23|12
ACAD1|1|2021-01-01|aerosol_bext|1010|1/Mm|40.45231|90|V0|1|ANN|24|12
ACAD1|1|2021-01-01|aerosol_bext|1010|1/Mm|18.41539|100|V0|1|ANN|118|12
ACAD1|1|2021-01-01|ammNO3f|1010|ug/m^3|0.06807|10|V0|1|ANN|23|12
ACAD1|1|2021-01-01|ammNO3f|1010|ug/m^3|0.10691|30|V0|1|ANN|23|12
ACAD1|1|2021-01-01|ammNO3f|1010|ug/m^3|0.16314|50|V0|1|ANN|25|12
ACAD1|1|2021-01-01|ammNO3f|1010|ug/m^3|0.32799|70|V0|1|ANN|23|12
ACAD1|1|2021-01-01|ammNO3f|1010|ug/m^3|0.44067|90|V0|1|ANN|24|12
ACAD1|1|2021-01-01|ammNO3f|1010|ug/m^3|0.22223|100|V0|1|ANN|118|12
ACAD1|1|2021-01-01|ammNO3f_bext|1010|1/Mm|0.62981|10|V0|1|ANN|23|12
ACAD1|1|2021-01-01|ammNO3f_bext|1010|1/Mm|0.97872|30|V0|1|ANN|23|12
Schema description:
| Field | Description |
|---|
| SiteCode | XF_SiteCode |
| POC | XF_POC |
| FactDate | XF_FactDate |
| ParamCode | XF_ParamCode |
| MethodID | XF_MethodID |
| Units | XF_Units |
| FactValue | XF_FactValue |
| HGroup |
HGroup ("Haze Group") indicates the quintile (percentile) based on sorting the annual data values from lowest to highest Deciview (dv)
IMPROVE convention bins the data values into "groups" based on this algortihm (where the prefix "p" stands for "percentile"):
IF the year's data did not meet the RHR completeness criteria or dv could not be calculated for some reason, then HGroup = 0
IF dv <= p20 Then HGroup = 10
IF dv > p20 AND dv < p40 THEN HGroup = 30
IF dv >= p40 AND dv <= p60 THEN HGroup = 50
IF dv > p60 AND dv < p80 THEN HGroup = 70
IF dv >= p80 then HGroup = 90
Annual average of across all groups = 100
|
| Status |
XF_StatusCode
| Flag | Description | Start Date | End Date | Records |
|---|
| V0 | Valid value | 1989-01-01 | 2021-01-01 | 468,468 |
|
| good_year |
Indicates whether or not the data meets RHR criteria for annual completeness |
| TypeCode |
A code that indicates the type of data record. The possible values are:
| Flag | Description | Start Date | End Date | Records |
|---|
| ANN | Indicates an annual aggregated (e.g. average) value | 1989-01-01 | 2021-01-01 | 468,468 |
|
| Number_obs | The number of valid daily values in the annual mean |
| ss_rayleigh | Rayleigh scattering value: the predominantly elastic scattering of light or other electromagnetic radiation by particles much smaller than the wavelength of the radiation |
References: