基于RS与GIS的保定市植被覆盖度动态变化
Dynamic Change of Fractional Vegetation Cover in Baoding Based on RS and GIS
-
摘要: 以1991、2004和2015年3个时相的TM/OLI遥感影像为数据源,利用基于归一化植被指数(NDVI)的像元二分模型估算保定市植被覆盖度,对其进行等级划分,并分析其时空变化特征。结果表明,1991—2015年,保定市植被覆盖度整体呈现下降的趋势,且不同区域存在差异现象。低植被与中低植被覆盖区面积整体呈增加趋势,而高植被覆盖区面积呈降低趋势。在4个研究分区中,保定市主城区植被覆盖度下降最为明显,1991—2015年的25年间,植被覆盖率下降了12.76%,平均每年下降约0.5%。研究发现,城市开发与建设及其导致的农用地减少等是植被覆盖度变化的主要原因。Abstract: By using data sources of remote sensing images(TM/OLI images)in 1991,2004 and 2015,vegetation fractional coverage of Baoding was calculated through dimidiate pixel model which based on NDVI,then vegetation fractional coverage grades was divided,and features of its temporal and spatial variation were analyzed.Results showed that vegetation fractional coverage of Baoding presented decline trend for integrated and different areas had different results.The area of low vegetation and medium-low increased,and the area of high vegetation decreased.Decline of main urban area in Baoding was significantly in all the four research districts,vegetation fractional coverage decreased 12.76% and average of decreased rate about 0.5% per year in the twenty five years of 1991—2015.Research showed that urban development,construction,and reduced agricultural land were the main causes for vegetation coverage change.
-
Keywords:
- Vegetation fractional coverage /
- NDVI /
- Dimidiate pixel model /
- Baoding city
点击查看大图
计量
- 文章访问数: 674
- HTML全文浏览量: 0
- PDF下载量: 208
- 被引次数: 0