63
Field Parameter Description Explanation
1 Number of Instruments numeric value of number of
instruments supplying data
more than one instrument may be supplying
the transmission data
2 Instrument #1 Type numeric key defining type of
instrument
direct pointing (1), cosine derived (2)
3 Instrument Description Text description of instrument Manufacturer, model, serial number (if
applicable), general information on method
of observation, data collection, etc.
4 Detector Type Text description of the detector The type of detector (e.g., photodiode,
PMT, single, array). The manufacturer and
model of detector used (if known). If more
than one type of detector is used indicate
the detector/wavelength pairing
5 Optics Type Text description of the instrument
optical train.
Description of optics (e.g., single detector
with filter wheel; multiple detectors with
multiple entrance apertures; focussed
system; grating; prism; etc.)
6 Field of View
Parameters
Numeric parameters based on
type of optics
Information such as opening angle, slope
angle, f-number for focussing instruments,
directional responsivity for cosine-type
instruments, etc.
7 Number of
wavelengths
Numeric value of the number of
wavelengths
Multiple wavelengths are possible from
each instrument
8 Calibration method Numeric key indicating type of
calibration
Langley (1), Instrument comparison (2),
standard lamp (3), trap detector (4),
combination or other (5)
9 Calibration description Text description of calibration
method
Detailed information on method of
calibration
10 Calibration date Date of calibration. Date to be
given in same format as
broadband calibrations.
The calibration date given may not be the
most recent calibration.
11 W avelength #1 Actual wavelength (8) The measured central wavelength of the
passband (e.g., 501.2 nm, not 500 nm)
12 Bandpass #1 Width of first bandpass (*8) Measured FWHM of bandpass
13 Description of
bandpass #1
Text description of bandpass Information on filter function, blocking filters,
slit function etc., depending on type of
instrument
14 Calibration uncertainty
for wavelength #1
Numeric parameters that describe
the uncertainty of the calibration
procedure
Include the combined uncertainty of all
aspects of the calibration and the
confidence level
15 Repeat fields 11 - 14
for each wavelength
16 Repeat fields 2 - 15
for each instrument
Table 7.3. Information required by the archive on the instrument(s) being used for determining
atmospheric transmission.
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