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A Glacier Identification Method Based on Coherence Coefficient Threshold

A technology of coherence coefficient and identification method, which is applied in radio wave measurement system, radio wave reflection/re-radiation, instruments, etc., can solve problems such as difficult distinction and difficult target identification, achieve good classification effect, reduce manual participation, and data Get easy and simple results

Active Publication Date: 2022-03-04
NANJING UNIV
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Problems solved by technology

However, the mountainous glacier area covers a large amount of surface moraine, and it is difficult to distinguish the surface moraine from the surrounding features in the visible and near-infrared bands on optical remote sensing images.
At the same time, optical remote sensing images are limited by weather conditions, and it is often difficult to identify targets due to the influence of clouds and fog.

Method used

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  • A Glacier Identification Method Based on Coherence Coefficient Threshold
  • A Glacier Identification Method Based on Coherence Coefficient Threshold
  • A Glacier Identification Method Based on Coherence Coefficient Threshold

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Embodiment Construction

[0027] The present invention will be described in detail below according to the accompanying drawings, so as to make the technical route and operation steps of the present invention clearer. The data used in the example of the present invention is the wide-width interferometric pattern (Interferometric WideSwath, IW) data of Sentinel-1A SAR data. The data polarization methods selected in this paper are all "VV" polarization methods. When screening data, in order to reduce the impact of snow cover on the accuracy of glacier boundary extraction, image data from August to October were selected as much as possible. The SAR data was acquired on August 5, 2018 (main image) and August 17, 2018 (secondary image). The time baseline of SAR images is 12 days, and the vertical baseline is 9.93m.

[0028] figure 1 It is a flow chart of the glacier identification method, and the specific steps are as follows:

[0029] The first step is to download the unclassified SAR image pair data an...

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Abstract

The present invention relates to a glacier identification method based on coherence coefficient threshold. Firstly, the SAR image pair is processed by raw data reading, image registration, interferogram calculation, coherence estimation, removal of flat phase, phase filtering and geocoding to obtain coherence. Coefficient map, the glacier area presents low coherence characteristics on the coherence coefficient map. Then fit the curve relationship between the coherence coefficient value and the corresponding number of pixels in the coherence coefficient map of the study area, and calculate the first derivative of the curve relationship. The transition point to the non-glacial area is the selected threshold b. Then classify the coherence coefficient map through the rule-based object-oriented classification method, and set up the classification rules as: γ

Description

technical field [0001] The invention relates to a glacier identification method based on the coherence coefficient, in particular to the determination of the coherence coefficient threshold for identifying the glacier. [0002] technical background [0003] As an important adjustable freshwater resource, glacier resources are closely related to regional climate change and hydrological effects, and are good indicators of changes in the climate system. With global warming and shortage of fresh water resources, the monitoring of changes in glaciers, especially mountain glaciers, has become an important issue in resource utilization and sustainable development. Early glacier monitoring mainly relied on field surveys. Before the 1930s, changes in several monitoring points at the end of the glacier were relied on to calculate the change in glacier length. However, mountain glaciers are mostly distributed in areas with high terrain and steep terrain, so it is difficult to carry out...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90G01S13/95G01S7/02G01S7/41
CPCG01S13/9005G01S13/9023G01S13/955G01S7/024G01S7/41G01S13/9027
Inventor 柯长青郭唯娜范宇宾姚国慧喻薛凝
Owner NANJING UNIV
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