Research communica ons - NF-POGO alumni Dr. Nguyen Huu Huan1, Tong Phuoc Hoang Son2 and Lau Va Khin3 1
Head of Department of Marine Ecology, Ins tute of Oceanography, Vietnam Wikipage: h p://www.nf-pogo-alumni.org/~Elisee+Toualy 1 Senior Researcher, Ins tute of Oceanography, Vietnam Wikipage: h p://www.nf-pogo-alumni.org/~Tong+Phuoc+Hoang+Son 1 Senior Researcher, Ins tute of Oceanography, Vietnam Wikipage: h p://www.nf-pogo-alumni.org/~Va+Khin+Lau
Applica on of remote sensing technology in the mapping coral reefs and seagrass beds in the coastal waters of Ninh Thuan and Binh Thuan provinces ntroduc on Remote sensing technology plays a very important role for observing the Earth’s surface. Knowing the importance of remote sensing techniques in environmental observa on and monitoring, Vietnam launched the VNREDSAT-1 satellite (Vietnam Natural Resources, Environment & Diaster – monitoring Satellite-1), the 7th May 2013. The VNREDSAT-1 system comprises an op cal satellite capable of capturing images with a resolu on of 2.5 metres for Panchroma c type, 10 m resolu on for mul spectral images. This satellite aims to monitor and study natural resources and the environment as to find suitable solu ons to prevent natural disasters, and as to op mise the management of natural resources. Ninh Thuan-Binh Thuan coastal area is located in upwelling region, which provides fishing grounds for many marine organisms of economic value. Importantly, this is also the area in which the first two nuclear power plants in Vietnam will be built. Thus, monitoring and warning systems to avert of changes in the environment and natural resources under socioeconomic pressure are essen al. This can only be sa sfied by the use of remote sensing data, including VNREDSat-1 images. This paper will present some preliminary results on mapping coral reefs and seagrass beds in the coastal waters of Ninh Thuan and Binh Thuan provinces from the Vietnam na onal project: “Building the Dataset on Oceanography Parameters from VNREDSAT-1 and Other Satellite Imageries in Coastal Waters of Ninh Thuan and Binh Thuan Provinces for Sustainable Economic Development”.
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Study Area The coastal waters of Ninh Thuan – Binh Thuan (Figure 1) is located in the south of Vietnam. The area covers strong upwelling waters as well as typical coral reefs and seagrass beds, which are mainly living on mixing bo om types of sand, death coral and rock in the range of about 1.5 km from the coastline. In recent years, following the requirement of economic developing, a new road along the coast was opened and connected to the No. 1 na onal road to the North. This development is increasing the threat to the coastal ecosystems, directly and indirectly, for both coral reefs and seagrass beds in this study area.
Figure 2 - Some images of fieldwork
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Figure 1 - The studied area scope and 321 color composite VNREDSAT1 image (V130904033142X_2A )
Data Satellite data A satellite image of VNREDSAT1 (V130904033142X_2A code, level 2A, date 04 Sep 2013) is acquired from the (Vietnamese) Na onal Remote Sensing Agency and used in this study. This image includes 4 spectral bands (red, green, blue and infrared), 10 m spa al resolu on, 8 bit radiance resolu on, and very good quality (i.e. 0% cloud cover level). In situ data A total of 292 ground control points of 11 substrate types were observed using a small boat (diving/snorkeling) as well as walking on dal ground at low dal level from 27th to 30th September 2014 (Figures 1 and 2). There are 66 points of low-density seagrass, 61 points of high-density seagrass, 31 points of hard coral, 48 points of death coral/rock/algae and 51 points of sand/
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