GeoCarb SIF Simulation Set
==========================
(Peter Somkuti, peter.somkuti@colostate.edu)
Feel free to contact the author for help or requests for additional data.

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Version 1.0
(initial submission)

http://reef.atmos.colostate.edu/~psomkuti/GeoCarbSIF/GeoCarbSIF_version1.0.csv.gz
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[variable, unit, meaning] (not necessarily in order as they appear in the CSV file)


lon, degrees, Longitude of footprint center as calculated through the geometry simulator
lat, degrees, Latitude of footprint center as calculated through the geometry simulator
lon_mod, degrees, Longitude of footprint center calculated through PROJ (use this for regular gridding)
lat_mod, degrees, Latitude of footprint center calculated through PROJ (use this for regular gridding)
first_pass, logical, Whether this scene is measured during the first scan pass
second_pass, logical, Whether this scene is measured during the second scan pass
land_fraction, percent, Fraction of land at the footprint center (either 0 or 100)
time, ?, Time of measurement (start) in UTC (Zulu) time as string
sza, degrees, Solar zenith angle
vza, degrees, Viewing (or instrument) zenith angle
Tau_water, 1, Total optical depth of water clouds in the scene
Tau_aerosol, 1, Total optical depth of tropospheric aerosols in the scene
Tau_ice, 1, Total optical depth of ice clouds in the scene
boa_757_truth, W/m2/sr/um, True SIF radiance at the bottom of the atmosphere at 757nm
toa_757_truth, W/m2/sr/um, True SIF radiance at the top of the atmosphere at 757nm
psurf_met, Pa, Surface pressure as given by the meteorological data (not the true value used in simulations!)
dp_abp, hPa, Surface pressure difference as obtained by the A-Band Preprocessor (ABP)
co2_ratio, 1, Ratio of retrieved single-band XCO2 between weak and strong CO2 bands
h2o_ratio, 1, Ratio of retrieved single-band XH2O between weak and strong CO2 bands
albedo_truth, 1, True apparent surface albedo used in the simulations
granule_running_number, 1, Running index of the granule (35x1016 scenes) in time-ascending order
footprint_vertex_lon_?, degrees, Longitude of one of the four corner points of the footprint quadrilateral (? = 1,2,3,4)
footprint_vertex_lat_?, degrees, Latitude of on of the four corner points of the footprint quadrilateral (? = 1,2,3,4)
SIF_[alg]_[win], W/m2/sr/um, Retrieved SIF using algorithm [alg = phys, emp] for retrieval window [win = 757nm, 757nm_short, 771nm]
SIF_[alg]_[win]_ucert, W/m2/sr/um, Reported uncertainty of retrieved SIF using algorithm [alg = phys, emp] for retrieval window [win = 757nm, 757nm_short, 771nm]
SIF_[alg]_rel_[win], 1, Retrieved SIF using algorithm [alg = phys, emp] for retrieval window [win = 757nm, 757nm_short, 771nm] as a fraction of the continuum level radiance
SIF_[alg]_rel_[win]_ucert, 1, Reported uncertainty of retrieved SIF using algorithm [alg = phys, emp] for retrieval window [win = 757nm, 757nm_short, 771nm] as a fraction of the continuum level radiance
cont_[win], W/m2/sr/um, Continuum level radiance observed for the retrieval window [win = 757nm, 757nm_short, 771nm]
coef_emp_?_[win], 1, Waveform scaling coefficient #? [? = 1,2,3,4] for retrieval window [win = 757nm, 757nm_short, 771nm]
coef_emp_?_[win]_ucert, 1, Reported uncertainty on waveform scaling coefficient #? [? = 1,2,3,4] for retrieval window [win = 757nm, 757nm_short, 771nm]



Additional information:
=======================

The coordinates are given in two sets of lon/lat: "lon", "lat" and "lon_mod", "lat_mod". The former coordinates were calculated by a geometry simulator routine and is the basis on which all other quantities are calculated (solar, viewing geometry, etc.) or sampled (SIF, trace gases, meteorological profiles, etc.). This set of coordinates, however, is not fully consistent with PROJ's or Cartopy's geostationary coordinate system (or general vertical coordinates). So if one attempts to perform spatial gridding according to e.g. Appendix A of the manuscript, the result will exhibit aliasing artefacts. To overcome this issue, the second set of coordinates provides similar locations, which are however consistent with PROJ and Cartopy, so regular gridding in geostationary coordinates remains artefact free if performed correctly. Due to the slight changes in location, the georeferenced and sampled quantities will be offset from their intended value (e.g. the land mask will be off by a small amount).