Satellite Image of the month – April – Halong Bay
Halong Bay, Vietnam
The satellite image of the month April shows a section of the north coast of Vietnam with numerous island formations. Among other things, many islands belonging to the famous Halong Bay can be identified well. The chosen colour combination for this image is a false colour composite, which offers good possibilities for vegetation analyses. Healthy vegetation appears in bright green tones and can be easily distinguished from the soil, which is coloured in a spectrum from pink (e.g. harvested fields) to bright pink (e.g. cleared rainforest). Cities are coloured in light grey to light pink. The spatial resolution is 20 metres.
The famous Halong Bay (Vịnh Hạ Long) is one of Vietnam’s most popular tourist attractions. On the satellite image, the bay can be identified through numerous small light green islands between the large island “Cát Bà” (left) and the elongated islands (e.g. Đảo Ngọc Vừng) in the right image area. The entire area of Halong Bay is about 1500km² and has been a UNESCO World Heritage Site since 1994.
Geologically, Halong Bay was created by a cone karst drowned in the Holocene. The characteristic islands protruding from the sea are so-called karst carts which are the weathering form of limestone and dolomite. As a result of the weathering process, entire cave systems have emerged in a large number of islands, which are frequently visited by tourists.
As you can see on the satellite image in light green, most of the karst carts are covered with dense plants or even jungle.
The city of Halong itself is also clearly visible, in the upper left half of the picture. The city of Halong is rising economically, especially due to the well-known karst rocks and the associated tourist masses. The city of Halong consists of two landmasses, that are connected by a bridge, the Bãi Cháy Bridge. The coastlines marked in pink are largely built up with hotels or holiday apartments.
Contains modified Copernicus Sentinel data (2017-2018)/ESA – created by mundialis
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