Summary:
Fish-eye view multispectral sensor looking up at an altocumulus cloud field from the ground.
Included files:
AC_lookup_RAD.bsq MCScene radiance cube for no-clouds case
AC_lookup_RAD.bsq.hdr header file for above
AC_lookup.bsq.OD pixel LOS optical depth cube for clouds-present case
AC_lookup.bsq.OD.hdr header file for above
Boreas5_avg.SRC_txt average ground reflectance as a function of wavelength (nm)
readme_AC_lookup.txt this file
Scenario:
Source reflectance data = AVIRIS data of Boreas, Saskatchewan, CAN, atmosphere removed with FLAASH, spectrally resampled to 5 custom bands
nBands = 5
first sensor band (chan, lambda, FWHM)= 1 440. 30. nm
last sensor band (chan, lambda, FWHM)= 5 1020. 30. nm
nxPixels = 511
nyPixels = 511
pixel LOS angles calculated from evenly spaced x & y direction cosines, dz2 = 1-dx2+dy2
sensor view = fisheye up-looking
SensorAlt (m) = 100.
SolarZenith (deg) = 5.
SolarAzimuth (deg) = 45.
DEM used = none, uniform 100 m elevation
atmosphere model = MODTRAN mid-latitude winter
aerosol model = MODTRAN rural
sea level visibility at 550 nm = 23 km
clouds = altocumulus cloud field generated by CSSM
cloud fractional coverage = 50 %
cloud scattering properties = MODTRAN cumulus
cloud base altitude = 4 km
max cloud thickness = 0.6 km
max cloud OD at 550 nm = 5
Notes on pixel coordinates:
The sensor LOS's are evenly spaced in dx and dy, the direction cosines in the x & y directions, and run from horizon to horizon. The LOS direction is specified as a unit vector, and so dz=sqrt(1-dx2+dy2). There are 511 x 511 pixels, and so dx and dy span the range -1 to 1 in steps of 1/255. For example, pixel(256, 256) lies in the center of the image where dx=dy=0 and dz=1. Pixel(511, 256) lies at right-center of the image where dx=1 and dy=dz=0.