CosineOfLatitudeTimesOrbitNode.cc

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/*
 * (C) Copyright 2020 UCAR
 *
 * This software is licensed under the terms of the Apache Licence Version 2.0
 * which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
 */
 
#include "ufo/predictors/CosineOfLatitudeTimesOrbitNode.h"
 
#include <vector>
 
#include "ioda/ObsSpace.h"
 
#include "ufo/utils/Constants.h"
 
namespace ufo {
 
static PredictorMaker<CosineOfLatitudeTimesOrbitNode>
       makerFuncCosineOfLatitudeTimesOrbitNode_("cosine_of_latitude_times_orbit_node");
 
// -----------------------------------------------------------------------------
 
CosineOfLatitudeTimesOrbitNode::CosineOfLatitudeTimesOrbitNode(const Parameters_ & parameters,
                                                               const oops::Variables & vars)
  : PredictorBase(parameters, vars) {
}
 
// -----------------------------------------------------------------------------
void CosineOfLatitudeTimesOrbitNode::compute(const ioda::ObsSpace & odb,
                                             const GeoVaLs &,
                                             const ObsDiagnostics &,
                                             ioda::ObsVector & out) const {
  const std::size_t nlocs = out.nlocs();
  const std::size_t nvars = out.nvars();
 
  // retrieve the sensor view angle
  std::vector<float> cenlat(nlocs, 0.0);
  std::vector<float> node(nlocs, 0.0);
  odb.get_db("MetaData", "latitude", cenlat);
  odb.get_db("MetaData", "sensor_azimuth_angle", node);
 
  for (std::size_t jloc = 0; jloc < nlocs; ++jloc) {
    for (std::size_t jvar = 0; jvar < nvars; ++jvar) {
      out[jloc*nvars+jvar] = node[jloc] * cos(cenlat[jloc] * Constants::deg2rad);
    }
  }
}
 
// -----------------------------------------------------------------------------
 
}  // namespace ufo