Abstract
Abstract. The Bohai Sea is the inland sea with the highest latitude in China. In winter, the phenomenon of freezing occurs in the Bohai Sea due to frequent cold wave influx. According to historical records, there have been three serious ice packs in the Bohai Sea in the past 50 years which caused heavy losses to our economy. Therefore, it is of great significance to monitor the drift of sea ice and sea ice in the Bohai Sea. The GF4 image has the advantages of short imaging time and high spatial resolution. Based on the GF4 satellite images, the three methods of SIFT (Scale invariant feature – the transform and Scale invariant feature transform), MCC (maximum cross-correlation method) and sift combined with MCC are used to monitor sea ice drift and calculate the speed and direction of sea ice drift, the three calculation results are compared and analyzed by using expert interpretation and historical statistical data to carry out remote sensing monitoring of sea ice drift results. The experimental results show that the experimental results of the three methods are in accordance with expert interpretation and historical statistics. Therefore, the GF4 remote sensing satellite images have the ability to monitor sea ice drift and can be used for drift monitoring of sea ice in the Bohai Sea.
Highlights
The Bohai Sea is located in 37°07′- 41°00 ′N,117° 35′121°10′ E(figure 1), which is the semi-enclosed sea of our country
The Bohai Sea ice belongs to one year ice, and the development of sea ice can be divided into three stages, ie, the initial ice period, frozen period, and final ice age
This paper is mainly based on GF4 satellite images to monitor the drift of Bohai sea ice, which is beneficial to sea ice recognition because of its high spatial resolution (50m)
Summary
The Bohai Sea is located in 37°07′- 41°00 ′N,117° 35′121°10′ E(figure 1), which is the semi-enclosed sea of our country. It is very important to monitor sea ice in Bohai Sea area. This paper is mainly based on GF4 satellite images to monitor the drift of Bohai sea ice, which is beneficial to sea ice recognition because of its high spatial resolution (50m). The satellite was developed by China Academy of Space Technology (CAST), based on their new GEO remote-sensing satellite bus. It has orbital mass of 4,600 kg, and was designed for a life span of 8 years. The shape of the reflection spectrum curve of annual sea ice in the Bohai Sea is similar to that of seawater and snow. GaoFen band wavelengths are shown, GF4 satellite remote sensing images are suitable for sea ice monitoring research GaoFen band wavelengths are shown in the above table, GF4 satellite remote sensing images are suitable for sea ice monitoring research
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