# ARTS built-in documentation server

## Workspace Method surface_rtpropInterpFreq

### Description

Interpolates surface RT properties in frequency. The WSVs surface_rmatrix and surface_emission are inter- polated linearly in frequency. The original frequency is given by f_grid, and there is an interpolation to new frequency grid. The function resets f_grid to the new grid.

**Authors: **Patrick Eriksson

### Synopsis

surface_rtpropInterpFreq( | f_grid, surface_rmatrix, surface_emission, f_new ) |

### Variables

OUT+IN | f_grid | (Vector) | The frequency grid for monochromatic pencil beam calculations. |

OUT+IN | surface_rmatrix | (Tensor4) | The reflection coefficients for the directions given by surface_los to the direction of interest. |

OUT+IN | surface_emission | (Matrix) | The emission from the surface. |

GIN | f_new | (Vector) | New frequency grid |