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应用遥感和地理信息系统调查了孟加拉国Sylhet林业分局所辖的Bhanugach西部保育林从1988年到2006年间用地类型的变化。应用了监督和非监督两种方法,用全球定位系统搜集了地面控制点。地理信息系统软件制成地图。结果表明,植被覆盖从1988年的1826hm2大幅地降低到1996年的1714.85hm2,随着协同管理措施的实施,植被覆盖自1996年后逐年增长到2006年的1847.83hm2。在没有其他类型的用地转变成裸地的情况下,裸地变化与植被覆盖间成反比。18年间水体面积从1988年的307.67hm2增加到1996年379.53hm2,96-97年间略有下降,1997年以后直到2006年基本保持不变。本文还提出了将遥感技术和地理信息系统应用于用地类型变化及地理信息系统数据库创建的一些建议。
Using remote sensing and geographic information system (GIS), the change of land use type in western conservation forest of Bhanugach under the jurisdiction of Sylhet Forestry Bureau of Bangladesh from 1988 to 2006 was investigated. Two methods, supervised and unsupervised, were used to collect ground control points using the Global Positioning System. Geographic Information System software made of the map. The results showed that the vegetation cover decreased from 1826 hm2 in 1988 to 1714.85 hm2 in 1996. With the implementation of the collaborative management measures, the vegetation cover increased from 1996 to 1847.83 hm2 in 2006. In the absence of other types of land converted into bare land, the change in bare land is inversely proportional to vegetation cover. In 18 years, the water area increased from 307.67hm2 in 1988 to 379.53hm2 in 1996, and decreased slightly in 96-97 years. From 1997 to 2006, it remained basically unchanged. The paper also proposes some suggestions for applying remote sensing technology and geographic information system to land use type change and GIS database.