M2: Backscatter Dependence on Local Incidence Angle

Tile 12SUC33, acquired 2023-10-08 (12SUC33_20231008013527_K5_ES02_NRB)

Grade: A

Description

Fits the relationship between backscatter and local incidence angle (LIA) for the reference (gamma-naught E) and the product (gamma-naught T) using 1-degree LIA bin medians, and evaluates whether radiometric terrain correction removed the LIA dependence.

Results

Ellipsoidal incidence angle23.702°
Regression slope, gamma-naught E (slope_E)0.02398 dB/deg
Regression slope, gamma-naught T (slope_T)0.01252 dB/deg
Change in gamma-naught T per 10° of LIA0.1252 dB (threshold 0.20 dB)
Basis of grade|slope_T| is smaller than |slope_E|, and the change in gamma-naught (T) per 10 degrees of LIA (0.125 dB) is less than 0.20 dB.

Figures

Grading Rule

C if |slope_T| ≥ |slope_E|. Otherwise, A if the change in gamma-naught (T) per 10° of LIA is less than 0.20 dB; B if it is 0.20 dB or greater. Not assessable if valid pixels < 5%.