排序方式： 共有8条查询结果，搜索用时 15 毫秒
1
1.
2.
3.
4.
基于GIS的鄱阳湖湿地遥感调查实验研究 总被引：15，自引：0，他引：15
在对鄱阳湖地区生态环境和湿寺物波谱特征研究的基础上,通过实地调查和ＭＥＳＳＲ遥感影像剖析,提出了ＭＥＳＳＲ影湿地解译模式和实验区草洲的空间分布规律,阐明了选择ＭＥＳＳＲ影像的优越性,并借助ＧＩＳ计算了枯水季节实验区各种湿地的面积,指出湖滩草洲是湖区的重要资源,是湖区脱贫致富经济可持续发展的潜力所在。而湿地遥感调查 实现这一目的的有效手段 相似文献
5.
陇西黄土高原陆面蒸散的遥感研究 总被引：18，自引：0，他引：18
该文以陆面能量平衡过程为基础,基于定量遥感的理论,提出了适合半干旱区(陇西黄土高原)的陆面蒸散估算遥感模型(SEBS)。结合该区域的NOAA/AVHRR数据、气象观测数据、土地利用数据和地形高程(DEM)数据,依据定量遥感的理论和技术,计算反照率、陆面温度、植被指数和地表比辐射率四个重要地表特征参数。应用SEBS模型,估算了该区域的陆面蒸散量。结果表明：该研究具有较好的理论和实践意义,为陆面过程、植被生产、生态环境保护与生态重建等研究提供科学依据。 相似文献
6.
基于NIR-Red光谱特征空间的土壤水分监测新方法 总被引：17，自引：0，他引：17
干旱是一种频繁发生的自然灾害, 而土壤水分作为干旱监测最重要的指标, 一直成为干旱遥感监测研究的重点内容. 利用经过几何精校正和大气校正的ETM＋近红外(Nir)、红光(Red)波段反射率建立Nir-Red光谱特征空间, 根据土壤水分在该特征空间的分布规律, 提出了遥感监测土壤水分的新方法, 并建立了基于Nir-Red光谱特征空间的土壤水分监测模型(SMMRS). 利用野外测定的不同深度土壤水分数据验证了SMMRS模型. 计算结果表明SMMRS模型观测值变化曲线和实测土壤水分变化趋势保持一致, 与5 cm和0~20 cm平均土壤水分相关系数分别为0.80和0.87. 认为基于Nir-Red光谱特征空间的SMMRS简单、易于构建, 有一定的应用价值和推广意义. 相似文献
7.
中国内陆河流域植被对气候变化的敏感性差异(英文) 总被引：1，自引：0，他引：1
Terrestrial ecosystem and climate system are closely related to each other. Faced with the unavoidable global climate change, it is important to investigate terrestrial ecosystem responding to climate change. In inland river basin of arid and semi-arid regions in China, sensitivity difference of vegetation responding to climate change from 1998 to 2007 was analyzed in this paper. (1) Differences in the global spatio-temporal distribution of vegetation and climate are obvious. The vegetation change shows a slight degradation in this whole region. Degradation is more obvious in densely vegetated areas. Temperature shows a gen-eral downward trend with a linear trend coefficient of -1.1467. Conversely, precipitation shows an increasing trend with a linear trend coefficient of 0.3896. (2) About the central tendency response, there are similar features in spatial distribution of both NDVI responding to precipitation (NDVI-P) and NDVI responding to AI (NDVI-AI), which are contrary to that of NDVI responding to air temperature (NDVI-T). Typical sensitivity region of NDVI-P and NDVI-AI mainly covers the northern temperate arid steppe and the northern temperate desert steppe. NDVI-T typical sensitivity region mainly covers the northern temperate desert steppe. (3) Regarding the fluctuation amplitude response, NDVI-T is dominated by the lower sensi-tivity, typical regions of the warm temperate shrubby, selui-shrubby, bare extreme dry desert, and northern temperate meadow steppe in the east and temperate semi-shrubby, dwarf ar-boreous desert in the north are high response. (4) Fluctuation amplitude responses between NDVI-P and NDVI-AI present a similar spatial distribution. The typical sensitivity region mainly covers the northern temperate desert steppe. There are various linear change trend re-sponses of NDVI-T, NDVI-P and NDVI-AI. As to the NDVI-T and NDVI-AI, which are influ-enced by the boundary effect of semi-arid and semi-humid climate zones, there is less cor-relation of their linear change tendency along the border. There is stronger correlation in other regions, especially in the NDVI-T in the northern temperate desert steppe and NDVI-AI in the warm temperate shrubby, selui-shrubby, bare, extreme and dry desert. 相似文献
8.
有人提出太阳辐射具有一种由11年太阳黑子周期包络线构成的80～90年周期的变化,并认为全球温度的显著变化是由此引起的。这一观点受到了批评,因为统计分析表明,并没有观测到太阳辐射有明显的变化。然而,有相当充分的资料支持另一种看法,即:太阳活动对全球气候有直接影响的是太阳黑子周期的长度。根据过去130年的记录,它与北半球陆地气温的长期变化吻合得很好。 相似文献
1