Supported ENVISAT Products |

## Measurement Data Set containing spectra. 1 MDSR per spectra.

Fields of ENVISAT ASAR_Spectra_MDSR Records

Index | Identifier | Field Type | Field Length | Description | Units
0 | `"zero_doppler_time"` | MJD | 1 | First Zero Doppler Azimuth time of the wave cellTime of first range line in the SLC Imagette MDS described by this data set | MJD
1 | `"quality_flag"` | UChar | 1 | Quality Indicator (-1 for blank MDSR, 0 otherwise) | flag
2 | `"range_spectral_res"` | Float | 1 | Range spectral resolution of the cartesian cross spectrum | -
3 | `"az_spectral_res"` | Float | 1 | Azimuth spectral resolution of the cartesian cross spectrum | -
4 | `"az_resample_factor"` | Float | 1 | Azimuth re-sampling factor in look extraction(Swath specific) | -
5 | `"spec_tot_energy"` | Float | 1 | Spectrum Total Energy | -
6 | `"spec_max_energy"` | Float | 1 | Spectrum Max Energy | -
7 | `"spec_max_dir"` | Float | 1 | Direction of Spectrum Max (deg)on higher resolution grid | deg
8 | `"spec_max_wl"` | Float | 1 | Wavelength of Spectrum Max (m)on higher resolution grid | m
9 | `"clutter_noise"` | Float | 1 | Clutter Noise | -
10 | `"az_cutoff"` | Float | 1 | Azimuthal Clutter Cut-off length (m) | m
11 | `"num_iterations"` | Float | 1 | Number of iterations to compute Azimuthal Clutter Cut-off | -
12 | `"range_offset"` | Float | 1 | Range offset of peak of cross covariance function (m) | m
13 | `"ax_offset"` | Float | 1 | Azimuth offset of peak of cross covariance function (m) | m
14 | `"cc_range_res"` | Float | 1 | Range resolution of cross co-variance spectrum (rad/m) | rad/m
15 | `"cc_azimuth_res"` | Float | 1 | Azimuth resolution of cross co-variance spectrum (rad/m) | rad/m
16 | `"sublook_means"` | Float | 2 | 1st and last Sub-look Image Means | -
17 | `"sublook_variance"` | Float | 2 | 1st and last Sub-look Image Variance | -
18 | `"sublook_skewness"` | Float | 2 | 1st and last Sub-look Image Skewness | -
19 | `"sublook_kurtosis"` | Float | 2 | 1st and last Sub-look Image Kurtosis | -
20 | `"range_sublook_detrend_coeff"` | Float | 2 | 1st and last Sub-look de-trend coefficient in range | -
21 | `"az_sublook_detrend_coeff"` | Float | 2 | 1st and last Sub-look de-trend coefficient in azimuth | -
22 | `"min_imag"` | Float | 1 | Min value of Imaginary part of cross spectrum | -
23 | `"max_imag"` | Float | 1 | Max value of Imaginary part of cross spectrum | -
24 | `"min_real"` | Float | 1 | Min value of Real part of cross spectrum | -
25 | `"max_real"` | Float | 1 | Max value of Real part of cross spectrum | -
26 | `"spare_1"` | Spare | 1 | Spare | -
27 | `"real_spectra"` | UChar | .SPH.num_wl_bins,.SPH.num_dir_bins | Real part of cross spectra polar gridNumber of bins in wavelength and direction defined in SPH (nominally 24 by 36). However, only 0 to 180 degree of the spectrum need be supplied (24 by 18). Arranged as: 24 wavelength values for 0-10 deg. sector, 24 valu | -
28 | `"imag_spectra"` | UChar | .SPH.num_wl_bins,.SPH.num_dir_bins | Complex part of cross spectra polar gridNumber of bins in wavelength and direction defined in SPH (nominally 24 by 36). However, only 0 to 180 degree of the spectrum need be supplied (24 by 18). Arranged as: 24 wavelength values for 0-10 deg. sector, 24 v | -