闽江口区域土地利用变化时空特征分析

Analysis on the spatial-temporal features of land-use change in Minjiang estuary region

以闽江流域临海区长乐市为研究区域,基于1998年与2000年的TM/ETM+和SPOT遥感图像,及1998年土地利用GIS数据和社会经济统计数据,对长乐市1998-2000年的土地利用动态变化的时空特征进行研究.长乐市土地利用动态变化的主要类型为水田、林地、旱地和未利用地,表现为水田、林地的明显减少,旱地、未利用地及居民地的大量增加,占总面积25.39%的土地单元发生了各种不同类型的土地利用变化,土地利用程度总体处于发展期,并有深化的趋势.

Based on change detection technigue of remote sensing and data based on GIS, we took the case in Changle county in Minjiang estuary region to updating and analysis analyze and study the spatial - temporal trends in landuse changes and its entironment. Three satellite images, i.e. two from TM or ETM^＋ and one from SPOT scenes, were used. Landuse change areas were determined using the two change detection techniques of post - classification comparison and spectrum comparison. The resultant change images obtained by the two change detection methods were overlaied to obtain more accurate change information. The analysis of the change information indicates that landuse in Changle have changed greatly in the study period. The landuse changes mainly occurred in paddy field, forest, dry land and barren land. The paddy field and forest significantly decreased, while the dry land, barren land and built - up land gradually increased. It took all kinds of landuse change by 25.39% of landuse total area. The spatial - temporal further analysis of the change data shows that degree of land use in the study area was still in the developing stage. The landuse change analysis information of Changle county improves the capability of landuse management for the county.