MODTRAN tape7输出文件解释
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出处http://twiki.cis.rit.edu/twiki/bin/view/Main/ModtranTape7ColumnDescriptions
MODTRAN TAPE7 Column Descriptions
This page is an attempt to document our interprettation of the various columns generated by MODTRAN. This output will be different depending on the geometry specified by the user, but initial documentation will be for a sensor looking down to the ground (ModtranH1vsH2). Subsequent geometries will be detailed as we encounter specific examples.
- MODTRAN TAPE7 Column Descriptions
- Current Interpretation of MODTRAN tape7 output
- LOWTRAN7 Description of tape7 output
- and COMMENTS
Current Interpretation of MODTRAN tape7
output
The following description is based on a sample output from MODTRAN of the following file.
- tape7.scn: MODTRAN
tape7.scn
file from which the data was plotted
tape7
. The difference between the tape7
file and the tape7.scn
file is that the former is in [1/cm] which is the native unit of MODTRAN output prior to MODTRAN3. The output wavelength for the tape7.scn
file can be user-specified. In this example, the tape7.scn
output file has wavelengths specified in [microns] and radiance in [W/sr/cm^2/um].The following columns are labelled as follows with the definition/description. The plots that correspond to the various spectra was generated using the following tape5
file.
- tape5: MODTRAN tape5 file that created the plots on this page
The resulting tape7.scn
file has been converted to the ENVI spectral library files
- tape7.sli: ENVI Spectral Library containing the
tape7.scn
data and - tape7.sli.hdr: ENVI Spectral Library header file
- FREQ MCRN
- The band-center wavelength of the given spectral point entry for the following radiometric parameters.
- TRAN
- The transmission from the target to the sensor, i.e.,
tau2
in the Big Equation.
- Plot of TRAN Column [Unitless]:
- PTH THRML
- The thermal emission term of the path radiance (neglible in the reflective region)
- Plot of PTH_THRML Column [W/(sr cm^2 um)]:
- THRML SCT
- The thermal scattering term of the path radiance (negligible in the reflective region)
- SURF EMIS
- Radiant emission of the target as a function of its temperature and emissivity
- Plot of SURF_EMIS Column [W/(sr cm^2 um)]:
- SOL SCAT
- The solar multiple-scattered radiance term of the path radiance.
- Plot of SOL_SCAT Column [W/(sr cm^2 um)]:
- SING SCAT
- The solar single-scattered radiance term of the path radiance.
- Plot of SING_SCAT Column [W/(sr cm^2 um)]:
- GRND RFLT
- The total ground reflected radiance. For a target of reflectivity 1.0, this term would be
(Direct Reflected Radiance) + (Diffuse Reflected Radiance)
or %$\frac{E^{'}_{s \lambda}\cos\theta \tau_1(\lambda)\tau_2(\lambda)}{\pi}+L_{d \lambda} \tau_2$% in the Big Equation
- Plot of GRND_RFLT Column [W/(sr cm^2 um)]:
- DRCT RFLT
- This is the direct reflected radiance. For a target of reflectivity 1.0, this term would be
(Direct Reflected Radiance)
or %$\frac{E^{'}_{s \lambda}\cos\theta \tau_1(\lambda)\tau_2(\lambda)}{\pi}$% in the Big Equation
- Plot of DRCT_RFLT Column [W/(sr cm^2 um)]:
- TOTAL RAD
- This is the total radiance reaching the sensor which should be equivalent to %$\frac{E^{'}_{s \lambda}\cos\theta \tau_1(\lambda)\tau_2(\lambda)r(\lambda)}{\pi} + L_{d \lambda}\tau_2 r(\lambda) + L_{u\lambda}$% in the Big Equation. Because of the simplified form of this equation, adjacency and environmental effects may not represented in the equation resulting in a larger value for TOTAL RAD computed by MODTRAN.
- Plot of TOTAL_RAD Column [W/(sr cm^2 um)]:
- REF SOL
- This is SOL@OBS multiplied by tau1 and tau2. This column is most likely in units of irradiance [W/cm^2], not radiance, since SOL@OBS is in irradiance units and tau1*tau2 is unitless. ( N.B. Found some old notes attributed to Lee Sanders that REF_SOL for the version we were using back during his research, was EsTau1Tau2 -- RolandoRaqueno - 08 Mar 2007)
- Plot of REF_SOL Column [W/(cm^2 um)]:
- SOL@OBS
- This is the downwelling solar irradiance at the altitude of the observer. This value should be DRCT RFLT if we move the target to the height of the sensor. N.B. The units should be Irradiance in the plot -- RolandoRaqueno - 06 Nov 2006
- Plot of SOL@OBS Column [W/(cm^2 um)]:
<img width="360" alt="Plot of <a href=" mailto:sol@obs"="" style="vertical-align: text-bottom; border: 0px;">SOL@OBS Column [W/(cm^2 um)]" src="/twiki/pub/Main/ModtranTape7ColumnDescriptions/SOL_OBS.jpg" height="255" />
- DEPTH
- Negative Log of the transmittance column TRAN
- Plot of DEPTH Column [1/m] or [1/km], not sure of this ???:
0 0
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