Assessment of land‐cover changes related to shrimp aquaculture using remote sensing data: a case study in the Giao Thuy District, Vietnam

Shrimp culture is a sector of aquaculture that has a high potential for poverty alleviation and rural development in Vietnam. However, the development of this activity induces changes that potentially have negative impacts on the environment, one of which is wetland deterioration. This paper describes the use of a proposed change detection methodology in the assessment of mangrove forest alterations caused by aquaculture development, as well as the effectiveness of the measures taken to mitigate deforestation in the district of Giao Thuy, Vietnam, between 1986, 1992 and 2001. Geometric and radiometric corrections were applied to Landsat images prior to identifying changes through comparison of unsupervised classifications. Changes were afterwards validated using a thresholding method based on Tasselled Cap feature image differencing and a rule‐based feature selection matrix. The matrix is used to identify the feature that is most efficient at detecting the presence of change between given land‐cover classes. The proposed approach aims to minimize commission errors in the post‐classification change detection process. The results suggest that 63% of mangrove areas apparent in 1986 had been replaced by shrimp ponds in 2001. Between 1986 and 1992, 440 ha of adult mangrove trees had disappeared, whereas the mangrove extent increased by 441 ha between 1992 and 2001. This recovery is attributed to reforestation projects and conservation efforts that promoted natural regeneration.

[1]  D. Roberts,et al.  A comparison of methods for monitoring multitemporal vegetation change using Thematic Mapper imagery , 2002 .

[2]  Arturo Ruiz-Luna,et al.  Modifications in coverage patterns and land use around the Huizache-Caimanero lagoon system, Sinaloa, Mexico : A multi-temporal analysis using landsat images , 1999 .

[3]  John R. Jensen,et al.  Introductory Digital Image Processing: A Remote Sensing Perspective , 1986 .

[4]  William J. Volchok,et al.  Radiometric scene normalization using pseudoinvariant features , 1988 .

[5]  W. Cohen,et al.  Comparison of Methods for Detecting Conifer Forest Change with Thematic Mapper Imagery , 2007 .

[6]  B. Markham,et al.  Revised Landsat-5 TM radiometric calibration procedures and postcalibration dynamic ranges , 2003, IEEE Trans. Geosci. Remote. Sens..

[7]  J. Verdin,et al.  Automated update of an irrigated lands GIS using SPOT HRV imagery , 1990 .

[8]  C. Woodcock,et al.  An assessment of several linear change detection techniques for mapping forest mortality using multitemporal landsat TM data , 1996 .

[9]  John R. Turner,et al.  Land cover changes and impact of shrimp aquaculture on the landscape in the Ceuta coastal lagoon system, Sinaloa, Mexico , 2003 .

[10]  David M. Johnson,et al.  Impacts of vegetation dynamics on the identification of land-cover change in a biologically complex community in North Carolina, USA , 2002 .

[11]  M. Ridd,et al.  A Comparison of Four Algorithms for Change Detection in an Urban Environment , 1998 .

[12]  P. O. Adeniyi,et al.  An enhanced classification approach to change detection in semi-arid environments , 1988 .

[13]  Jinfei Wang,et al.  Mapping Disturbances in a Mangrove Forest Using Multi-Date Landsat TM Imagery , 2001, Environmental management.

[14]  J. Mas.  Monitoring land-cover changes: A comparison of change detection techniques , 1999 .

[15]  Ashbindu Singh,et al.  Review Article Digital change detection techniques using remotely-sensed data , 1989 .

[16]  Limin Yang,et al.  Derivation of a tasselled cap transformation based on Landsat 7 at-satellite reflectance , 2002 .

[17]  Tung Fung,et al.  The Determination of Optimal Threshold Levels for Change Detection Using Various Accuracy Indices , 2008 .

[18]  T. Fung.  An Assessment Of Tm Imagery For Land Cover Change Detection , 1989, 12th Canadian Symposium on Remote Sensing Geoscience and Remote Sensing Symposium,.

[19]  S. Goetz,et al.  Radiometric rectification - Toward a common radiometric response among multidate, multisensor images , 1991 .

[20]  C. Boyd,et al.  Shrimp aquaculture and the environment. , 1998 .

[21]  R. J. Kauth,et al.  The Tasseled Cap de-mystified , 1986 .

[22]  Louis Lebel,et al.  Industrial Transformation and Shrimp Aquaculture in Thailand and Vietnam: Pathways to Ecological, Social, and Economic Sustainability? , 2002, Ambio.

[23]  W. Neil Adger,et al.  Property rights and the utilisation of wetlands. , 2000 .

[24]  Marvin E. Bauer,et al.  Processing of multitemporal Landsat TM imagery to optimize extraction of forest cover change features , 1994, IEEE Trans. Geosci. Remote. Sens..

[25]  E. Crist.  A TM Tasseled Cap equivalent transformation for reflectance factor data , 1985 .

[26]  Chen Xiuwan,et al.  Using remote sensing and GIS to analyse land cover change and its impacts on regional sustainable development , 2002 .

[27]  J. R. Jensen,et al.  An evaluation of the CoastWatch change detection protocol in South Carolina , 1993 .