Greetings all,
A few of us here at RSS took a look at your new names and offer some
thoughts:
1. For the platform and sensor look angle as written, nadir is defined
as pointing towards the center of the Earth. We question whether this
is appropriate for all cases, as many satellites are flown with nadir
pointing toward the closest place on Earth, so that the nadir look has
an incidence angle of 0. (geodetic vs. geocentric pointing). We
suggest separate geodetic and geocentric look angle definitions to
reduce confusion, such as sensor_look_angle_geocentric and
sensor_look_angle_geodetic.
2. There is only a
linear_term_of_spectral_radiance_correction_due_to_intercalibration and
a constant_term_of_spectral_radiance_correction_due_to_intercalibration.
Many microwave radiometers have quadratic (or higher order) terms in the
calibration and subsequent calibration corrections. We suggest adding
more names.
3. Azimuth angle definitions need to be clearer (see suggested changes
in bold below). We would like to be sure that the definition is
unambiguous. For example, the definition of platform_azimuth_angle
would be clearer if it read:
"platform" refers to the vehicle from which observations are made e.g.
airplane, ship, or satellite. Platform azimuth angle is the horizontal
angle between the line of sight *from the observation point *to the
platform and a reference direction *at the observation point,* which is
often due north. The angle is measured clockwise*starting from the
reference direction*.
4. The definition for sensor_band_central_wavenumber does not say
whether the first moment of the band's normalized spectral response
function is averaged over wavelength or frequency. One can't invert
wavelength and wavenumber if not calculated correctly.
Thanks for taking these points into consideration. Significant input
came from Carl Mears and Kyle Hilburn at RSS.
-Deborah
--
Deborah K Smith
Scientist
Remote Sensing Systems
smith@xxxxxxxxx
www.remss.com
www.discover-earth.org
