Optical remote sensing satellite image-based coral reef integrated monitoring method

Abstract

The invention discloses an optical remote sensing satellite image-based coral reef integrated monitoring method. The method comprises the following steps of: reading a multispectral image of a remotesensing image by using a remote sensing image processing method in advance, and calculating the attenuation coefficient ratio of a red light wave band to an infrared wave band to obtain a water depthcorrection result; establishing decision trees by using different wave bands, NDVI and NDWI for classification, and distinguishing seawater, cloud and coral reef areas; masking the multispectral imageand the water depth correction result of the remote sensing image, masking the seawater and the cloud area, and performing unsupervised classification on the coral reef area to obtain a coral reef classification chart; calculating a Hot Spot index and a degree of heat of week (DHW) of coral reef whitening according to MODIS sea surface temperature data, and performing grading display according toa value range to prepare a coral reef whitening early warning grading chart; and combining the coral reef classification chart with the seawater and cloud area image to output a coral reef distribution map. The method can realize effective detection, automatic and semi-automatic coral reef monitoring and whitening monitoring information extraction.

Description

technical field [0001] The invention belongs to the application field of remote sensing images, and relates to an integrated monitoring method for coral reefs based on optical remote sensing satellite images. Background technique [0002] Coral reefs are one of the most prominent and representative ecosystems in tropical oceans, with amazing biodiversity and high primary productivity. There are tens of thousands of marine organisms inhabiting the coral reef area, which is of great significance to the optimization of the marine environment and marine ecosystem. Coral reefs are mostly located in shallow waters off the coast or very close to islands, and are easily affected by human activities. Although the global area of ​​coral reefs reaches 2×10 8 km 2 , but the coral reef is currently in a state of continuous decline and deterioration. Affected by global climate and environmental changes, most of the world's sea areas where coral reefs have developed have experienced ma...

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Problems solved by technology

Although the global area of ​​coral reefs reaches 2×10 8 km 2 , but the

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