# Update sensor min/max wavelengths in the reader YAML files

I noticed that for many of the sensors the minimum and maximum wavelengths given in the reader YAML file for a given channel are inconsistent:
`wavelength: [min_wvl, central_wvl, max_wvl]`

These values appear to have been taken from various sources with differing standards. In this PR I'm attempting to standardise things by setting the min and max wavelengths to a fixed spectral response function value.

For a range of SRFS and paired wavelengths, sorted by ascending wavelength, I define: The minimum wavelength as the first time the instrument SRF is > 0.15 The maximum wavelength as the last time the instrument SRF is > 0.15

In all cases I take the SRFs from the NWP-SAF / RTTOV webpages.

Currently this is a work in progress. Below is a list of readers I've checked / updated: - [x] abi_l1b - [x] abi_l1b_scmi - [x] abi_l2_nc - [ ] acspo - [x] agri_l1 - [x] ahi_hrit - [x] ahi_hsd - [x] ahi_l1b_gridded_bin - [x] ami_l1b - [x] amsr2_l1b - [x] amsr2_l2 - [x] avhrr_l1b_aapp - [x] avhrr_l1b_eps - [x] avhrr_l1b_gaclac - [x] avhrr_l1b_hrpt - [x] caliop_l2_cloud - [x] clavrx - [x] cmsaf-claas2_l2_nc - [ ] electrol_hrit - [ ] fci_l1c_fdhsi - [ ] fci_l2_nc - [x] generic_image - [x] geocat - [x] ghrsst_l3c_sst - [x] glm_l2 - [ ] goes-imager_hrit - [ ] goes-imager_nc - [x] gpm_imerg - [x] grib - [x] hsaf_grib - [x] hy2_scat_l2b_h5 - [x] iasi_l2 - [x] iasi_l2_so2_bufr - [ ] jami_hrit - [x] li_l2 - [x] maia - [ ] mersi2_l1b - [x] mimicTPW2_comp - [x] modis_l1b - [x] modis_l2 - [x] msi_safe - [ ] mtsat2-imager_hrit - [x] nucaps - [x] nwcsaf-geo - [x] nwcsaf-msg2013-hdf5 - [x] nwcsaf-pps_nc - [x] olci_l1b - [x] olci_l2 - [x] omps_edr - [x] safe_sar_l2_ocn - [x] sar-c_safe - [x] scatsat1_l2b - [x] seviri_l1b_hrit - [x] seviri_l1b_icare - [x] seviri_l1b_native - [x] seviri_l1b_nc - [x] seviri_l2_bufr - [x] seviri_l2_grib - [x] slstr_l1b - [x] slstr_l2 - [x] smos_l2_wind - [x] tropomi_l2 - [x] vaisala_gld360 - [ ] vii_l1b_nc - [x] vii_l2_nc - [x] viirs_compact - [x] viirs_edr_active_fires - [x] viirs_edr_flood - [x] viirs_l1b - [x] viirs_sdr - [ ] virr_l1b

该提问来源于开源项目：pytroll/satpy

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