US 12,217,503 B2
Tidal flat extraction method based on hyperspectral data
Gang Yang, Ningbo (CN); Weiwei Sun, Ningbo (CN); Chunchen Shao, Ningbo (CN); Xiangchao Meng, Ningbo (CN); and Tian Feng, Ningbo (CN)
Assigned to NINGBO UNIVERSITY, Ningbo (CN)
Filed by NINGBO UNIVERSITY, Ningbo (CN)
Filed on Aug. 19, 2024, as Appl. No. 18/808,129.
Application 18/808,129 is a continuation of application No. PCT/CN2024/090522, filed on Apr. 29, 2024.
Claims priority of application No. 202310809318.3 (CN), filed on Jul. 4, 2023.
Prior Publication US 2025/0014332 A1, Jan. 9, 2025
Int. Cl. G06V 20/10 (2022.01); G06V 10/22 (2022.01); G06V 10/32 (2022.01); G06V 10/58 (2022.01)
CPC G06V 20/194 (2022.01) [G06V 10/22 (2022.01); G06V 10/32 (2022.01); G06V 10/58 (2022.01)] 18 Claims
OG exemplary drawing
 
1. 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.