An Uncontrolled Extraction Method of Shallow Sea Depth Based on Four-Band Multispectral Remote Sensing Images

Abstract

The invention provides an uncontrolled extraction method of shallow water depth based on four-band multi-spectral remote sensing images, aiming at the measurement requirements of oceanic islands and reefs, combining the existing logarithmic ratio model and semi-analytical model, using the logarithmic ratio model blue The strong linear relationship between the logarithmic ratio of the reflectance of the green band and the water depth, the macroscopic constraints on the optical parameters of the regional water body, and the realization of shallow water depth extraction based on four-band multi-spectral remote sensing images without the support of actual measurement data will greatly improve the historical accumulation time. The application efficiency of the four-band multi-spectral remote sensing images with the most abundant and widely used remote sensing platforms is an innovation in the application of remote sensing information technology, a beneficial supplement to shallow water bathymetry on islands and reefs, and has great practical value .

Description

technical field [0001] The invention belongs to the field of remote sensing technology application and seabed topography surveying and mapping, and specifically relates to a method for extracting shallow water depth under the control of no measured water depth (referred to as uncontrolled) based on four-band multispectral remote sensing images. Background technique [0002] Seabed topographic mapping is the first step in exploring and studying the ocean, the first condition for developing and protecting the ocean, and an urgent need for oceanographic research today. Before the invention of the echo sounder, the water depth was mainly measured by the sounding rod and the sounding hammer, and the measurement accuracy was poor. After the echo sounder appeared in the 1920s, the drawing of sea charts in the modern sense was realized. However, the early echo sounders were launched with a single beam, and one launch could only obtain the water depth directly below the survey ship,...

AI Technical Summary

Problems solved by technology

However, this type of method is based on water body spectral information for water depth detection, so its applicability is affected by the water body environment. Since the existing optical radiative transfer model is difficult to accurately describe the complex water body scattering characteristics, it usually requires the support of measured water body optical parameters or water depth data. training to work effectively, which limits the application of these methods

The semi-analytical model is a water depth extraction method developed based on hyperspectral remote sensing data. Although it realizes the uncontrolled extraction of ocean shallow water depth, it is limited by the hyperspectral remote sensing data collection ability and data accumulation, and it cannot be widely used.

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