Source: /home/strow/Work/Airs/L1c/Freq_adjust/freq_interp_test.m

Data: None

A long-term goal for producing a climate quality AIRS radiance data set is to adjust the L1c data to a constant frequency grid. At present this is not done, and will be UMBC's responsibiility to implement.

A monochromatic spectrum for a sample profile (see internals of freq_interp_test.m) was generated for AIRS SRFs at grating model yoffset = -14um. A second set was generated for yoffset = -13um. These were then convolved with the AIRS SRFs to produce simulated AIRS spectra, recorded at two different frequency scales offset by 1um.

Using the Matlab interp1 routine the -13um spectra were interpolated back to -14um values, using either a linear or spline (4 point) interpolation. These interpolated spectra were then compared to the original -14um yoffset spectra. The results are shown in 1, where we see max errors of around 0.06K, with mean errors very much smaller.