#DEFINITIONS:  -*-sh-*-
# This is a test doing simulations for MSG-ICI instrument.
#
# So far, it's doing clearsky-pencilbeam simulations from and for (planned) ICI
#  orbit and observation geometry considering planned radiometer band
#  characteristics.
#
# Author: Jana Mendrok

Arts2 {

INCLUDE "general/general.arts"
INCLUDE "general/continua.arts"
INCLUDE "general/agendas.arts"
INCLUDE "general/planet_earth.arts"

# Agenda for scalar gas absorption calculation
Copy(abs_xsec_agenda, abs_xsec_agenda__noCIA)

# Basic settings (already needed in sensor part)
# ---
AtmosphereSet1D
IndexSet( stokes_dim, 1 )


# 1. General
#-----------

output_file_formatSetZippedAscii

# AMSU uses Planck brightness temperatures
# ---
StringSet( iy_unit, "PlanckBT" )

# AMSU uses Planck brightness temperatures
# ---
StringSet( iy_unit, "PlanckBT" )

# (standard) emission calculation
Copy( iy_main_agenda, iy_main_agenda__Emission )

# cosmic background radiation
Copy( iy_space_agenda, iy_space_agenda__CosmicBackground )

# standard surface agenda (i.e., make use of surface_rtprop_agenda)
Copy( iy_surface_agenda, iy_surface_agenda__UseSurfaceRtprop )

# sensor-only path
Copy( ppath_agenda, ppath_agenda__FollowSensorLosPath )

# no refraction
Copy( ppath_step_agenda, ppath_step_agenda__GeometricPath )

#
# modifiy the maximum propagation step, from the default to 250 m :
#
NumericSet( ppath_lmax, 250 )

# Surface
Copy( surface_rtprop_agenda,
      surface_rtprop_agenda__Specular_NoPol_ReflFix_SurfTFromt_surface )


# 2. Spectroscopy
#----------------

# We take a smaller cutoff, since the line-by-line calculation is 
# only for O3, where only the local lines matter.
# Could be speed-optimized further by selecting only the relevant 
# lines from the line list.
ArrayOfLineshapeSpecCreate( abs_lineshapeDefine )
abs_lineshapeDefine( abs_lineshapeDefine, "Voigt_Kuntz6", "VVH", 5e9 )

abs_speciesSet( species=[ "H2O-PWR98",
#                          "O3",
                          "O2-PWR93",
                          "N2-SelfContStandardType" ] )

# Read HITRAN catalog (needed for O3):
#abs_linesReadFromHitran( abs_lines,
#                         "/storage3/data/catalogue/hitran/hitran2012/HITRAN2012.par",
#                         150e9,
#                         700e9 )
#WriteXML( "ascii", abs_lines, "ici.hitran12_lines.xml" )

#ReadXML( abs_lines, "ici.hitran12_lines.xml" )
#abs_lines_per_speciesCreateFromLines
abs_lines_per_speciesSetEmpty

# WARNING: If you redefine abs_species, and want to do a line-by-line
# calculation, you also have to call
# abs_lines_per_speciesCreateFromLines again.


# 3. Sensor:
#-----------

INCLUDE "instruments/ici/ici_fast.arts"


# 4. Atmosphere
#--------------
# Atmospheric profiles are stored in an ArrayOfGriddedField4.
# It contains one GriddedField4 for each atmospheric state.
#
ReadXML( batch_atm_fields_compact, "../amsu/chevallierl91_clear_q_extract.xml" )

# add constant profiles for O2 and N2
batch_atm_fields_compactAddConstant( name="abs_species-O2", value=0.2095 )
batch_atm_fields_compactAddConstant( name="abs_species-N2", value=0.7808 )


# Set parameters for lookup table
# ---
# Arguments omitted for better maintainability of this test file.
#abs_lookupSetupWide
abs_lookupSetupBatch

# Create the lookup table
# ---
abs_xsec_agenda_checkedCalc

jacobianOff

abs_lookupCalc

# Set propmat_clearsky_agenda to use lookup table
# ---
Copy( propmat_clearsky_agenda, propmat_clearsky_agenda__LookUpTable )


# Set up RT calculation
# =====================

# Set surface reflectivity
# ---
# Here we take a value representative for the sea surface.
# NumericSet( surface_emissivity, 0.6 )  <--- Old, replaced by:
VectorSetConstant( surface_scalar_reflectivity, 1, 0.4 )


# Set the agenda for batch calculations:
# ---
#
AgendaSet( ybatch_calc_agenda ){
  
  # Extract the atmospheric profiles for this case:
  Extract(
    atm_fields_compact, 
    batch_atm_fields_compact, 
    ybatch_index
  )

  # Split up *atm_fields_compact* to
  # generate p_grid, t_field, z_field, vmr_field:
  AtmFieldsFromCompact

  # Optionally set Jacobian parameters.
  # uncomment this for NO jacobian calculations
  jacobianOff
  # Uncomment this block if you want Jacobians. Attention, it slows down the
  # computation a lot.
  # Also, you can add other Jacobians here, for example for temperature.
#  jacobianInit
#  jacobianAddAbsSpecies( jacobian_quantities, jacobian_agenda,
#                         atmosphere_dim,
#                         p_grid, lat_grid, lon_grid, 
#                         p_grid, lat_grid, lon_grid,
#                         "H2O-PWR98",
#                         "analytical",
#                         "rel",
#                         0.01 )
#  jacobianClose

  # No scattering
  cloudboxOff

  # get some surface properties from corresponding atmospheric fields
  Extract( z_surface, z_field, 0 )
  Extract( t_surface, t_field, 0 )

  # Perform RT calculations
  # ---
  atmfields_checkedCalc
  atmgeom_checkedCalc
  cloudbox_checkedCalc
  sensor_checkedCalc
  yCalc
}


# Set number of batch cases:
nelemGet( ybatch_n, batch_atm_fields_compact )
#IndexSet(ybatch_start, 2)
#IndexSet(ybatch_n, 2)

# Execute the batch calculations:
# ---
propmat_clearsky_agenda_checkedCalc
ybatchCalc


# Store result matrix:
# ---
WriteXML( "ascii", ybatch )

#WriteXML( "ascii", ybatch_jacobians )

ArrayOfVectorCreate( ybatch_ref )
ReadXML( ybatch_ref, "TestICI_fast.ybatch.ref.xml" )
Compare( ybatch, ybatch_ref, 0.2,
         "Total radiance should be close to the reference values" )

}