Supported ENVISAT Products |

## SQ ADSRs

Fields of ENVISAT ASAR_Wave_SQ_ADSR Records

Index | Identifier | Field Type | Field Length | Description | Units
0 | `"zero_doppler_time"` | MJD | 1 | Zero doppler time at which SQ information applies | MJD
1 | `"attach_flag"` | UChar | 1 | Attachment Flag. Set to 1 if PF-ASAR was unable to produce an imagette for the wave cell. The fields in other DSR's corresponding to this one are set to zero, apart from the Zero Doppler Time. | flag
2 | `"input_mean_flag"` | UChar | 1 | Input data mean outside nominal range flag0 = mean of I and Q input values are both within specified range from expected mean. For expected mean of x, the measured mean must fall between x-threshold to x+threshold.1 = otherwise | flag
3 | `"input_std_dev_flag"` | UChar | 1 | Input data standard deviation outside nominal range flag0 = standard deviation values of I and Q input values are both within specified range of expected standard deviation. For expected std. dev. x, the measured std. dev. must fall between x-threshold to | flag
4 | `"input_gaps_flag"` | UChar | 1 | Significant gaps in the input data flagAn input data gap is defined as a contiguous block of N missing lines (the value of N is predefined for each product)0 = number of input gaps <= threshold value1 = number of input data gaps > threshold value | flag
5 | `"input_missing_lines_flag"` | UChar | 1 | Missing lines significant flag 0 = percentage of missing lines <= threshold value 1 = percentage of missing lines > threshold valueThe number of missing lines is the number of lines missing from the input data excluding data gaps. | flag
6 | `"dop_cen_flag"` | UChar | 1 | Doppler Centroid Uncertain flag0 = confidence measure >= specified value1 = Error message generated if confidence measure < specified value(note: if more than one Doppler centroid estimation is performed in a slice the flag is set if any confidence measur | flag
7 | `"dop_amb_flag"` | UChar | 1 | Doppler ambiguity estimate uncertain flag0 = confidence measure >= specified value1 = confidence measure < specified value | flag
8 | `"output_mean_flag"` | UChar | 1 | Output data mean outside nominal range flag0 = mean of I and Q output values for SLC image or mean of detected pixels for a detected product, are both within specified range from expected mean. For expected mean of x, the measured mean must fall between x | flag
9 | `"output_std_dev_flag"` | UChar | 1 | Output data standard deviation outside nominal range flag0 = std. dev. of I and Q output values for SLC image or std. dev. of detected pixels for a detected product, are both within specified range from expected std. dev. For expected std. dev. of x, the | flag
10 | `"chirp_flag"` | UChar | 1 | Chirp extraction failed or is of low quality flag 0 = able to extract all chirps or chirp extraction not requested (nominal chirp used) AND all quality measures were acceptable.1 = unable to extract a chirp during processing and chirp extraction was reque | flag
11 | `"missing_data_sets_flag"` | UChar | 1 | Data sets missing flag0 = all data sets which are supposed to be in the product are present1 = any data sets (including ADSs) are missing from the product which are supposed to be included under normal circumstances. Which data sets are missing can be det | flag
12 | `"invalid_downlink_flag"` | UChar | 1 | Invalid downlink parameters flag0 = all parameters read from the downlinked data were valid1 = displayed if any downlink parameter is out of range and therefore a default value has been used during processing. | flag
13 | `"spare_1"` | Spare | 1 | Spare | -
14 | `"thresh_chirp_broadening"` | Float | 1 | Threshold for setting the chirp quality flag. Maximum percentage broadening permitted in cross-correlation pulse width compared to theoretical width. | %
15 | `"thresh_chirp_sidelobe"` | Float | 1 | Threshold for setting the chirp quality flag - First sidelobe of the chirp cross correlation function | dB
16 | `"thresh_chirp_islr"` | Float | 1 | Threshold for setting the chirp quality flag - ISLR of the chirp cross correlation function | dB
17 | `"thresh_input_mean"` | Float | 1 | Threshold for setting the mean of input data quality flag - For an expected mean value of x, this is the value T, such that the measured mean must fall between the x-T and x+T. | -
18 | `"exp_input_mean"` | Float | 1 | Expected mean input value for this product for both I and Q. | -
19 | `"thresh_input_std_dev"` | Float | 1 | Threshold for setting the standard deviation of input data quality flag - For an expected std. dev. value of y, this is the value D, such that the measured std. dev. must fall between the y-D and y+D. | -
20 | `"exp_input_std_dev"` | Float | 1 | Expected input std. dev. for this product for both I and Q. | -
21 | `"thresh_dop_cen"` | Float | 1 | Threshold for setting the Doppler Centroid quality flag - Threshold for Doppler Centroid confidence | -
22 | `"thresh_dop_amb"` | Float | 1 | Threshold for setting the Doppler Centroid ambiguity quality flag - Threshold for setting the Doppler Centroid ambiguity confidence flag | -
23 | `"thresh_output_mean"` | Float | 1 | Threshold for setting the mean of output data quality flag - For an expected mean value of x, this is the value T, such that the measured mean must fall between the x-T and x+T. | -
24 | `"exp_output_mean"` | Float | 1 | Expected mean output value for this product. For an SLC product this is the expected mean of both the I and Q values. | -
25 | `"thresh_output_std_dev"` | Float | 1 | Threshold for setting the standard deviation of output data quality flag - For an expected std. dev. value of y, this is the value D, such that the measured std. dev. must fall between the y-D and y+D. | -
26 | `"exp_output_std_dev"` | Float | 1 | Expected output std. dev. for this product. For an SLC product this is the expected output std. dev. for both I and Q values. | -
27 | `"thresh_input_missing_lines"` | Float | 1 | Threshold for setting the missing lines quality flag - maximum percentage of missing lines to total lines. | %
28 | `"thresh_input_gaps"` | Float | 1 | Threshold for setting the missing gaps quality flag - maximum number of missing gaps allowed. | -
29 | `"lines_per_gaps"` | ULong | 1 | Number of missing lines which constitute a gap | lines
30 | `"spare_2"` | Spare | 1 | Spare | -
31 | `"input_mean"` | Float | 2 | Input data mean (i channel, q channel | -
32 | `"input_std_dev"` | Float | 2 | Input data standard deviation (i channel, q channel) | -
33 | `"num_gaps"` | Float | 1 | Number of gaps (composed of a predetermined number of consecutive missing lines) | -
34 | `"num_missing_lines"` | Float | 1 | Number of missing lines (excluding gaps) | -
35 | `"output_mean"` | Float | 2 | Output data mean (detected samples, followed by zero, or i channel followed by q channel for SLC) | -
36 | `"output_std_dev"` | Float | 2 | Output data standard deviation (detected samples followed by zero, or i channel followed by q channel for SLC) | -
37 | `"tot_errors"` | ULong | 1 | Total number of errors detected in ISP headers | -
38 | `"Spare_3"` | Spare | 1 | Spare | -
39 | `"land_flag"` | UChar | 1 | Land Flag 0 = no land in imagette1 = land in imagette | flag
40 | `"look_conf_flag"` | UChar | 1 | Look image statistics confidence parameter flag 1 = The ratio of the standard deviation to the mean of the first look image is outside the range given by a minimum and a maximum threshold.0 =otherwise | flag
41 | `"inter_look_conf_flag"` | UChar | 1 | Inter-look confidence statistics confidence parameter flag1 = The normalised deviation of the two inter-look sub-images is greater than a maximum threshold.0 = otherwise | flag
42 | `"az_cutoff_flag"` | UChar | 1 | Azimuth cut-off convergence measure flag1 = The normalised RMS error between the fitted co-variance profile is greater than a maximum threshold.0 = otherwise | flag
43 | `"az_cutoff_iteration_flag"` | UChar | 1 | Azimuth cut-off Iteration count overflow flag1 = The Azimuth cut-off fit did not converge within a minimum number of iterations.0 = otherwise | flag
44 | `"phase_flag"` | UChar | 1 | Phase information confidence measure flag1 = The imaginary spectral peak is less than a minimum threshold, and the zero lag shift is greater than a minimum threshold.0 = otherwise | flag
45 | `"spare_4"` | Spare | 1 | Spare | -
46 | `"look_conf_thresh"` | Float | 2 | Look image statistics confidence parameter thresholds (minimum and maximum) | -
47 | `"inter_look_conf_thresh"` | Float | 1 | Inter-look confidence statistics confidence parameter threshold | -
48 | `"az_cutoff_thresh"` | Float | 1 | Azimuth cut-off convergence measure threshold | -
49 | `"az_cutoff_iterations_thresh"` | ULong | 1 | Azimuth cut-off Iteration count overflow threshold | -
50 | `"phase_peak_thresh"` | Float | 1 | Phase information confidence measure threshold for the spectral peak | -
51 | `"phase_cross_thresh"` | Float | 1 | Phase information confidence measure threshold for cross covariance peak offset | m
52 | `"spare_5"` | Spare | 1 | Spare | -
53 | `"look_conf"` | Float | 1 | Look image statistics confidence parameterThe ratio of the standard deviation to the mean of the first look image | -
54 | `"inter_look_conf"` | Float | 1 | Inter-look confidence statistics confidence parameter.The normalised deviation of the two inter-look sub-images | -
55 | `"az_cutoff"` | Float | 1 | Azimuth cut-off convergence measureThe normalised RMS error between the fitted co-variance profile | -
56 | `"phase_peak_conf"` | Float | 1 | Phase information confidence measure for the spectral peakThe imaginary spectral peak | -
57 | `"phase_cross_conf"` | Float | 1 | Phase information confidence measure for cross covariance peak offset | m
58 | `"spare_6"` | Spare | 1 | Spare | -