Method for automatically extracting coral reef based on time sequence remote sensing image

The invention relates to a method for automatically extracting a coral reef based on a time sequence remote sensing image. The method comprises the following steps: 1, carrying out parallel preprocessing on the remote sensing image, namely carrying out atmospheric correction on the image; step 2, automatic screening of remote sensing images: automatic screening of the images is realized from four aspects of space overlapping, date uniqueness, cloud cover and image entropy; 3, time sequence construction: constructing a time sequence of the image MNDWI; and 4, automatically extracting the coral reef, namely constructing a characteristic curve of the coral reef time sequence, calculating a DTW value between the pixel-level time sequence and the characteristic curve, determining a DTW threshold value by using a dichotomy method, and extracting the coral reef. According to the invention, the problem that various noises exist in the coral reef image is solved, automatic screening of the remote sensing image is realized, a reliable method for automatically extracting the coral reef based on the time sequence remote sensing image is provided, and a process thought is provided for automatically extracting the coral reef range based on other satellite sensors.