INTERPRETATION OF WATER INDICES FOR SHORELINE EXTRACTION FROM LANDSAT 8 OLI DATA ON THE SOUTHWEST COAST OF VIETNAM


Tran Anh Tuan1,* , Le Dinh Nam1 , Nguyen Thi Anh Nguyet1 , Pham Viet Hong1 ,

Nguyen Thi Ai Ngan2 , Vu Le Phuong1

 

1 Institute of Marine Geology and Geophysics, VAST, Vietnam

2 Suoi Hai Prison, General Department No. 8, Vietnam Ministry

of Public Security, Vietnam

*E-mail: tatuan@imgg.vast.vn

 

Abstract.

     The paper presents results of analysis of water indices using remote sensing data to extract an instantaneous shoreline at the time of image acquisition on the southwest coast of Vietnam. The water indices as NDWI (Normalized Difference Water Index), MNDWI (Modified Normalized Difference Water Index), and AWEI (Automated Water Extraction Index) were calculated from Landsat 8 OLI imagery. Then, an extracted distribution histogram of water indices’ values in the study area was used to separate the land from the sea. The position having abnormal frequency of pixels on the histogram is the threshold value to determine the boundary of land and water, and it is considered the shoreline. The study showed the threshold values of NDWI, MNDWI and AWEI which were defined at 0.12, 0.17 and 0.18 respectively. The precision of shoreline extraction from each respective water index was verified by field survey data using Mean Absolute Error (MAE) and Root Mean Square Error (RMSE) methods. The verified results showed that MAE and MSE of the shorelines extracted from all three water indices were lower than an allowed limit of 30 m (equivalent to spatial resolution of the Landsat 8 image). However, the shoreline extracted from AWEI had the highest accuracy and it was considered the most appropriate shoreline at the acquisition time of image.

 

      Keywords: Water indices, shoreline, remote sensing, Landsat 8 OLI, Southwest of Vietnam.

Tài liệu đính kèm:

KHCNB 2018 Tuan.pdf Tải về
THÔNG TIN - THƯ VIỆN

    Thư điện tử
    Thư Viện điện tử

ĐĂNG NHẬP

Tài khoản
Mật khẩu

THỐNG KÊ LƯỢT TRUY CẬP

     Số lượt truy cập: 972483
     Số người đang truy cập: 4

BẢN ĐỒ CHỈ DẪN


LIÊN KẾT

Chương trình khoa học công nghệ vũ trụ giai đoạn 2016-2020
QUẢNG CÁO
Máy nghiền mẫu dạng bi SpectroMill-Chemplex
Máy ép- nén mẫu SPECTROPRESS-XRF Briquetting Systems
Máy phân tích thành phần khoáng vật bằng tia X

VIỆN ĐỊA CHẤT VÀ ĐỊA VẬT LÝ BIỂN
----------------------------------------------------------------
Địa chỉ:   Nhà A27, Số 18 Hoàng Quốc Việt, Nghĩa Đô, Cầu Giấy, Hà Nội, Việt Nam
Tel: (+84)(24) 3791.0821      Fax:(+84)(24)3756.1647      Email: imggad@gmail.com      Website:http://imgg.vast.vn