The High-Tune: Starter Pack contains input data necessary to perform
htrdr. It also provides bash scripts that
make easier the invocation of the
htrdr program and the
description of the scene to render.
ecrad_opt_prop.txt file defines the gas optical properties
provided for the pressure and temperature atmospheric vertical profile. These
data were generated with the ECRAD
software and are saved according to the High-Tune: Gas Optical Properties file
The files contained in the
clouds subdirectory contains htcp files defining the liquid water content in
suspension within clouds. These fields are generated from idealized Large Eddy
Simulations computed by the French hydrostatic research model, MesoNH
et al 1998, Lac et
al 2018), with flat surfaces and prescribed large-scale forcings. Available
DZVAR.1.ARMCU.008.diaKCL.htcp: a continental cumulus case initialized from a composite of observed thermodynamic profiles measured on the ARM SGP site, following Brown et al. (2002). The provided field corresponds to the 8th hour of simulation (13h30 local time), in the middle of the diurnal cycle. The boundary layer is well-developed with cloud base height around 1km and cloud top around 2km, and a total cloud cover of around 25% of the 6.4km x 6.4km domain (horizontal resolution is 25m)
L12km.1.BOMEX.005.htcp: an oceanic, trade wind cumulus case initialized from observed thermodynamic profiles acquired during the BOMEX campaign in the Barbados. The model set-up is as in Siebesma et al. (2003) but with a 12.8km x 12.8km domain and resolution 25m. The cloud layer is between 500m and 1.5km heights and covers around 14% of the domain.
L25.1.FIRE.012.htcp: a marine stratocumulus case initialized from observed thermodynamic profiles acquired during the FIRE campaign off the coast of southern California. The model set-up is as in Duynkerke et al. (2004) with a 25km x 25km domain, 100m horizontal and 10m vertical resolutions. The field corresponds to the 12th hour of simulation (12h local time) typical of a decoupled boundary layer, with the overcast stratocumulus layer between 300 and 600m.
Water droplets properties
Mie_LUT_Cloud.nc stores the spectro-angular tabulation of
water droplets optical properties computed using the Mishchenko et al.
(2002) implementation of the Lorenz-Mie solution for light scattering by
homogeneous spherical particles. The monodisperse solution was integrated over
a log-normal droplet size distribution of mean 10 micrometers and standard
deviation 1 micrometer. This NetCDF file is formatted according to the High-Tune: Mie file format.
models subdirectory contains ground geometries saved in the
OBJ file format.
Available geometries are:
models/plane.obj: quad centered in 0 whose size along the X and Y dimension is 10 meters.
models/mountain.obj: geometry representing mountains. The OBJ lower bound is 0 while its upper bound is [10000, 10000, 700] which means that its size along the X and Y axis is 10 kilometers while the highest mountain peaks at 700 meters. Note that the geometry is carefully designed to be cyclic: it can be repeated along the X and Y axis without visual glitches.
scenes subdirectory stores bash scripts describing scenes
from the aforementioned data (atmosphere, clouds, etc.) and how to
render them (image definition, point of view, etc.). These files are
actually input files for the
ht-run.sh bash script builds and runs a
command line from a scene file submitted as input.
Install and run
Download the High-Tune: Starter-Pack archive and verify its integrity
against its PGP signature. Then
extract it. Assuming that
htrdr is installed and registered in the
current shell, one can invoke a
htrdr rendering as bellow:
$ cd ~/High-Tune-Starter-Pack-0.1.1 ~/High-Tune-Starter-Pack-0.1.1 $ bash ht-run.sh scenes/DZVAR2
~/High-Tune-Starter-Pack-0.1.1 the directory
where the Starter Pack is installed. The resulting image
DZVAR2_1280x720x128.txt is stored in the htrdr-image file format. Use the htpp program to convert it in a regular PPM
file that can be then displayed with a regular image viewer.
~/High-Tune-Starter-Pack-0.1.1 $ htpp -o DZVAR2.ppm DZVAR2_1280x720x128.txt
High-Tune: Starter Pack is released under the GPLv3+ license: GNU GPL version 3 or later. You can freely study, modify or extend it. You are also welcome to redistribute it under certain conditions; refer to the license for details.