SAR Noise Level & SNR Report — K5_20231008013527_000010_55609_D_ES02_HH_SCS_B

File	K5_20231008013527_000010_55609_D_ES02_HH_SCS_B_L1A.h5
Acquisition mode	STANDARD

File

K5_20231008013527_000010_55609_D_ES02_HH_SCS_B_L1A.h5

Acquisition mode

STANDARD

Summary of Results

S01 (19020 × 16288)Not measurable — assumed value -17.0 dB applied

Metric	Measured value	Criterion	Result
NESZ	-17.00 dB (assumed value, not measured) Excluded from evaluation: no usable water (no water class passed the gates)	< -17 dB	N/A
Measurement source	no usable water (no water class passed the gates)	Reference only	OK
SNR	Reference -17.00 dB applied uniformly · median 8.75 dB · p05 2.75 · p95 16.85 · below 0 dB 0.5% · no-data 0.0%	Reference only	OK
Calibration constants	CALCO 0.512749 · RF 0.0111499 · δa 2.196 m · δs 0.936 m · gain -45.09 dB	Reference only	OK

Metric

Measured value

Criterion

Result

NESZ

-17.00 dB (assumed value, not measured)
Excluded from evaluation: no usable water (no water class passed the gates)

< -17 dB

N/A

Measurement source

no usable water (no water class passed the gates)

Reference only

SNR

Reference -17.00 dB applied uniformly · median 8.75 dB · p05 2.75 · p95 16.85 · below 0 dB 0.5% · no-data 0.0%

Reference only

Calibration constants

CALCO 0.512749 · RF 0.0111499 · δa 2.196 m · δs 0.936 m · gain -45.09 dB

Reference only

Detailed Results

S01 (19020 × 16288) — Not measurable — assumed value -17.0 dB applied

no usable water (no water class passed the gates)

SNR map (dB)Reference -17 dB applied uniformly

Per-pixel signal-to-noise ratio. Each pixel's |DN|² is locally averaged over a square ground window and converted to absolute σ⁰, then the single representative NESZ value obtained above is subtracted (local averaging is needed because, in single-look data, per-pixel values are essentially noise due to speckle). Water surfaces appear near 0 dB because their signal equals the noise floor, while land appears higher. Gray pixels have no value (e.g. I=Q=0).

SNR histogramReference -17 dB applied uniformly

Distribution of the SNR map above. The vertical line marks 0 dB; pixels to its left are buried in noise. Scenes with large water areas show a peak near 0 dB, while land-dominated scenes show the peak shifted to the right.