Hong Duc University Journal of Science, S. 5 (2019)

Cỡ chữ:  Nhỏ  Vừa  Lớn

USING REMOTE SENSING AND GIS TO ANALYZE LAND COVER/LAND USE CHANGE IN QUANG XUONG DISTRICT, THANH HOA PROVINCE, VIETNAM

Nguyen Huu Hao

Tóm tắt


Identification of land use change in different periods of time has become a central key to monitoring of land resources. It is relatively important for effective land management to protect the land resources, especially the land used for agricultural production from overuse and environmental changes. The sprawl of inhabitant areas, development of rural infrastructures, and industrialization are responsible for serious losses of agricultural land. In this study, remote sensing techniques were applied to studying the trends of land cover change in the Quang Xuong District in a period of about 24 years from 1989 to 2013. ArcGIS software was adopted to develop the land cover and the change of land use maps from 1989 to 2013. Two satellite images with moderate resolution were collected from USGS Earth Explorer website, Landsat 5 TM for 1989 and Landsat 8 OLI & TIRS for 2013. After image geo-processing, the images were classified into six land cover categories by applying supervised classification method (Maximum Likelihood). The six main obtained land cover types were built-up areas, agricultural land, forest land, water surface area, salty land, and unused land. The overall accuracies of land cover maps for 1989 and 2013 were 94.08% and 92.91%, respectively. The results of change detection analysis indicate that the cultivated, water surface and unused lands decreased by 22%, 17%, and 91%, respectively. In other side, the built-up and salty land increased by 78%, 58%, respectively and forest land increased from 52.69 ha in 1989 to 395.76 ha in 2013.


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