Tidal flat extraction method based on hyperspectral data

A tidal flat extraction method based on hyperspectral data, comprising:

• S1, acquiring and preprocessing hyperspectral data, wherein the preprocessing comprises radiometric calibration, atmospheric correction, and orthorectification;
• S2, calculating a constraint condition, comprising a first constraint condition w, a second constraint condition v, and a third constraint condition s;
• S3, calculating, according to values of the first constraint condition w, the second constraint condition v, and the third constraint condition s, a normalized difference tidal flat index (NDTFI);
• generating a sample index statistical box chart;
• and determining a tidal flat extraction threshold according to the sample index statistical box chart;
• and
• S4, removing a misclassified pixel based on a coastal buffer zone and a high spatial resolution image, thereby achieving final extraction of a tidal flat,
• wherein in the step S2, the first constraint condition w is calculated as follows:
• w=ρ1274+ρ1660−ρ1980+α1
• wherein ρ1274 denotes a band value with a center wavelength of 1,274 nm, ρ1660 denotes a band value with a center wavelength of 1.660 nm, and ρ1980 denotes a band value with a center wavelength of 1,980 nm;
• and α1 denotes an offset coefficient of the first constraint condition w.