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A phenology-based vegetation index for improving ratoon rice mapping using harmonized Landsat and Sentinel-2 data 被引量:2
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作者 Yunping Chen Jie Hu +6 位作者 Zhiwen Cai Jingya Yang Wei Zhou Qiong Hu Cong Wang Liangzhi You Baodong Xu 《Journal of Integrative Agriculture》 SCIE CAS CSCD 2024年第4期1164-1178,共15页
Ratoon rice,which refers to a second harvest of rice obtained from the regenerated tillers originating from the stubble of the first harvested crop,plays an important role in both food security and agroecology while r... Ratoon rice,which refers to a second harvest of rice obtained from the regenerated tillers originating from the stubble of the first harvested crop,plays an important role in both food security and agroecology while requiring minimal agricultural inputs.However,accurately identifying ratoon rice crops is challenging due to the similarity of its spectral features with other rice cropping systems(e.g.,double rice).Moreover,images with a high spatiotemporal resolution are essential since ratoon rice is generally cultivated in fragmented croplands within regions that frequently exhibit cloudy and rainy weather.In this study,taking Qichun County in Hubei Province,China as an example,we developed a new phenology-based ratoon rice vegetation index(PRVI)for the purpose of ratoon rice mapping at a 30 m spatial resolution using a robust time series generated from Harmonized Landsat and Sentinel-2(HLS)images.The PRVI that incorporated the red,near-infrared,and shortwave infrared 1 bands was developed based on the analysis of spectro-phenological separability and feature selection.Based on actual field samples,the performance of the PRVI for ratoon rice mapping was carefully evaluated by comparing it to several vegetation indices,including normalized difference vegetation index(NDVI),enhanced vegetation index(EVI)and land surface water index(LSWI).The results suggested that the PRVI could sufficiently capture the specific characteristics of ratoon rice,leading to a favorable separability between ratoon rice and other land cover types.Furthermore,the PRVI showed the best performance for identifying ratoon rice in the phenological phases characterized by grain filling and harvesting to tillering of the ratoon crop(GHS-TS2),indicating that only several images are required to obtain an accurate ratoon rice map.Finally,the PRVI performed better than NDVI,EVI,LSWI and their combination at the GHS-TS2 stages,with producer's accuracy and user's accuracy of 92.22 and 89.30%,respectively.These results demonstrate that the proposed PRVI based on HLS data can effectively identify ratoon rice in fragmented croplands at crucial phenological stages,which is promising for identifying the earliest timing of ratoon rice planting and can provide a fundamental dataset for crop management activities. 展开更多
关键词 ratoon rice phenology-based ratoon rice vegetation index(PRVI) phenological phase feature selection Harmonized landsat Sentinel-2 data
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Wetland vegetation biomass estimation and mapping from Landsat ETM data: a case study of Poyang Lake 被引量:3
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作者 LI Ren-dong1, 2, LIU Ji-yuan2 (1. Institute of Geodesy and Geophysics, CAS, Wuhan 430077, China 2. Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101 China) 《Journal of Geographical Sciences》 SCIE CSCD 2002年第1期35-41,共7页
Poyang Lake is the largest freshwater lake in China. This paper conducted a digital and rapid investigation of the lake’s wetland vegetation biomass using Landsat ETM data acquired on April 16, 2000. First, utilizing... Poyang Lake is the largest freshwater lake in China. This paper conducted a digital and rapid investigation of the lake’s wetland vegetation biomass using Landsat ETM data acquired on April 16, 2000. First, utilizing the false color composite derived from the ETM data as one of the main references, the authors designed a reasonable sampling route for field measurement of the biomass, and carried it out on April 18–28, 2000. Then after both the sampling data and the ETM data were geometrically corrected to an equal-area projection of Albers, linear relationships among the sampling data and some transformed data derived from the ETM data and the ETM 4 were calculated. The results show that the sampling data is best relative to the band 4 data with a high correlation coefficient of 0.86, followed by the DVI and NDVI data with 0.83 and 0.80 respectively. Therefore, a linear regression model, which was based on the field data and band 4 data, was used to estimate the total biomass of entire Poyang Lake, and then the map of the biomass distribution was compiled. 展开更多
关键词 Poyang Lake BIOMASS wetland vegetation landsat Etm data
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Analysis of forest cover change at Khadimnagar National Park, Sylhet,Bangladesh, using Landsat TM and GIS data 被引量:1
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作者 Mohammad Redowan Sharmin Akter Nusrat Islam 《Journal of Forestry Research》 SCIE CAS CSCD 2014年第2期393-400,共8页
We mapped the forest cover of Khadimnagar National Park (KNP) of Sylhet Forest Division and estimated forest change over a period of 22 years (1988-2010) using Landsat TM images and other GIS data. Supervised clas... We mapped the forest cover of Khadimnagar National Park (KNP) of Sylhet Forest Division and estimated forest change over a period of 22 years (1988-2010) using Landsat TM images and other GIS data. Supervised classification and Normalized Difference Vegetation Index (NDVI) image classification approaches were applied to the images to produce three cover classes, viz. dense forest, medium dense forest, and bare land. The change map was produced by differencing classified imageries of 1988 and 2010 as before image and after image, respectively, in ERDAS IMAGINE. Error matrix and kappa statistics were used to assess the accuracy of the produced maps. Overall map accuracies resulting from supervised classification of 1988 and 2010 imageries were 84.6% (Kappa 0.75) and 87.5% (Kappa 0.80), respec- tively. Forest cover statistics resulting from supervised classification showed that dense forest and bare land declined from 526 ha (67%) to 417 ha (59%) and 105 ha (13%) to 8 ha (1%), respectively, whereas medium dense forest increased from 155 ha (20%) to 317 ha (40%). Forest cover change statistics derived from NDVI classification showed that dense forest declined from 525 ha (67%) to 421 ha (54%) while medium dense forest increased from 253 ha (32%) to 356 ha (45%). Both supervised and NDVI classification approaches showed similar trends of forest change, i.e. decrease of dense forest and increase of medium dense forest, which indicates dense forest has been converted to medium dense forest. Area of bare land was unchanged. Illicit felling, encroachment, and settlement near forests caused the dense forest decline while short and long rotation plantations raised in various years caused the increase in area of medium dense forest. Protective measures should be undertaken to check further degradation of forest at KNP. 展开更多
关键词 forest cover landsat tm supervised classification NDVI change statistics error matrix
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On Urban Heat Island of Beijng Based on Landsat TM Data 被引量:1
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作者 JIANG Zhangyan CHEN Yunhao LI Jing 《Geo-Spatial Information Science》 2006年第4期293-297,共5页
Land surface temperature (LST) of Beijing area was retrieved from Landsat TM thermal band data utilizing a radiative transfer equation and the urban heat island (HUI) effects of Beijing and its relationship with land ... Land surface temperature (LST) of Beijing area was retrieved from Landsat TM thermal band data utilizing a radiative transfer equation and the urban heat island (HUI) effects of Beijing and its relationship with land cover and normalized difference vegetation index (NDVI) were discussed. The result of LST showed that the urban LST was evidently higher than the suburban one. The average urban LST was found to 4.5 ℃ and 9 ℃ higher than the suburban and outer suburban temperature, respectively, which demonstrated the prominent UHI effects in Beijing. Prominent negative correlation between LST and NDVI was found in the urban area, which suggested the low percent vegetation cover in the urban area was the main cause of the urban heat island. 展开更多
关键词 land surface temperature landsat tm radiative transfer equation urban heat island
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基于SPOT4和Landsat5 TM的不同影像融合方法质量对比研究
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作者 肖远平 唐育林 曾小威 《河南科技》 2024年第14期88-92,共5页
【目的】探究不同影像融合方法对SPOT4全色影像和Landsat5 TM多光谱影像融合效果的影响。【方法】采用13种不同的影像融合算法开展融合试验,并通过定性和定量分析的方式,对融合结果进行综合评价分析。【结果】结果表明,融合影像的信息... 【目的】探究不同影像融合方法对SPOT4全色影像和Landsat5 TM多光谱影像融合效果的影响。【方法】采用13种不同的影像融合算法开展融合试验,并通过定性和定量分析的方式,对融合结果进行综合评价分析。【结果】结果表明,融合影像的信息熵相比原影像有所增强,RGB三通道的熵值分布更为均匀,主要集中在50~200之间。此外,不同地物类型对融合方法的效果产生了显著影响。对于水体和植被,Brovey、HSV、IHS和EF方法展现出了良好的光谱保真性和细节增强能力,因此更适用于目视解译。NND法在这些区域出现了轻微的光谱失真现象,导致其分类精度偏低。【结论】针对不同传感器的影像选择适当的融合方法,对于提高遥感影像的解译精度和应用价值具有重要意义。 展开更多
关键词 影像融合 质量评价 SPOT4 landsat5 tm
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PALSAR-FBS L-HH Mode and Landsat-TM Data Fusion for Geological Mapping 被引量:1
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作者 Abderrazak Bannari Ali El-Battay +1 位作者 Ali Saquaque Abdelhafid Miri 《Advances in Remote Sensing》 2016年第4期246-268,共23页
Characterized by lithological diversity and rich mineral resources, Benshangul-Gumuz National Regional State located in Asosa Zones, Western Ethiopia has been investigated for geological mapping and morpho-structural ... Characterized by lithological diversity and rich mineral resources, Benshangul-Gumuz National Regional State located in Asosa Zones, Western Ethiopia has been investigated for geological mapping and morpho-structural lineaments extraction using PALSAR (Phased Array type L-band Synthetic Aperture Radar ) Fine Beam Single (FBS) L-HH polarization and Landsat-5 TM (Thematic Mapper ) datasets. These data were preprocessed to retrieve ground surface reflectance and backscatter coefficients. To overcome the geometry acquisition between the two sensors, they were geometrically and topographically rectified using ASTER-V2 DEM. Intensity-Hue-Saturation, directional filters and automatic lineaments extraction were applied on the datasets for lithological units’ discrimination and structural delimitation for potential mineral exploration. The obtained results showed good relationship among the topographic morphology, rock-substrate, structural variations properties, and drainage network. The spectral variations were easily associated with lithological units. Likewise, the morpho-structural information highlighted in the PALSAR image was visible without altering the radiometric integrity of the details in TM bands through the fusion process. Moreover, predominant lineaments directions trending NE-SW, NS, and NW-SE were identified. Results of this study highlighted the importance of the PALSAR FBS L-HH mode and TM data fusion to enhance geological features and lithological units for mineral exploration particularly in tropical zones. 展开更多
关键词 Geology Mineral Exploration Lineaments Extraction data Fusion Intensity-Hue-Saturation Mapping landsat-tm PALSAR-FBS L-HH Polarization ASTER DEM
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Improved Geological Interpretation Using Landsat TM Data in Lancang-Jinghong Area, Yunnan Province, China
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作者 Bassam F Al Bassam 《Journal of China University of Geosciences》 SCIE CSCD 2003年第1期52-58,共7页
Landsat TM digital spectral data of Lancang Jinghong area (Yunnan P ro vince) has been used for the purpose of geological interpretation. To meet this object, different image processing techniques including selected... Landsat TM digital spectral data of Lancang Jinghong area (Yunnan P ro vince) has been used for the purpose of geological interpretation. To meet this object, different image processing techniques including selected band color comp osites, principal component analysis and IHS decorrelation stretching are used t o improve the discrimination of different lithological and structural features i n the area.It was found that IHS decorrelation stretching images obtained from t he transformation of false color composite 741 (in red, green and blue) prov ided the best results based on the original data.By combining the characteristic s of images produced by different approaches and other canonically transformed i mages with available geological data and surface observations, the geological in terpretation could be done with satisfactory degree of accuracy. 展开更多
关键词 landsat tm color composite images principal component analysis (PCA) IHS decorrelation stretching Lancang Jinghong China.
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Comparison in Landsat TM Land-Cover Data between Cholwon(South Korea)and Wonsan(North Koreaa)
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《Journal of Earth Science》 SCIE CAS CSCD 2000年第2期24-25,共2页
关键词 Comparison in landsat tm Land-Cover data between Cholwon Korea)and Wonsan tm
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Assessment and Evaluation of Band Ratios, Brovey and HSV Techniques for Lithologic Discrimination and Mapping Using Landsat ETM<sup>+</sup>and SPOT-5 Data
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作者 Ahmed Madani 《International Journal of Geosciences》 2014年第1期5-11,共7页
This study aims to assess and to evaluate band ratios, brovey and HSV (Hue-Saturation-Value) techniques for discrimination and mapping the basement rock units exposed at Wadi Bulghah area, Saudi Arabia using multispec... This study aims to assess and to evaluate band ratios, brovey and HSV (Hue-Saturation-Value) techniques for discrimination and mapping the basement rock units exposed at Wadi Bulghah area, Saudi Arabia using multispectral Landsat ETM+ and SPOT-5 panchromatic data.?FieldSpec instrument is utilized to collect the spectral data of diorite, marble, gossan and volcanics, the main rock units exposed at the study area. Spectral profile of diorite exhibits very distinguished absorption features around 2.20 μm and 2.35 μm wavelength regions. These absorption features lead to lowering the band ratio values within the band-7 wavelength region. Diorite intrusions appear to have grey and dark grey image signatures on 7/3 and 7/2 band ratio images respectively. On the false color composite ratio image (7/3:R;7/2:G and 5/2:B), diorite, marble, gossan and volcanics have very dark brown, dark blue, white and yellowish brown image signatures respectively. Image fusion between previously mentioned FCC ratio image and high spatial resolution (5 meters) SPOT-5 panchromatic image is carried out by using brovey and HSV transformation methods. Visual and statistical assessment methods prove that HSV fused image yields best image interpretability results rather than brovey image. It improves the spatial resolution of the original FCC ratios image with acceptable spectral preservation. 展开更多
关键词 landsat Etm+ data SPOT-5 Panchromatic Image BAND Ratios-Brovey and HSV TECHNIQUES
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Alteration Information Extraction by Applying Synthesis Processing Techniques to Landsat ETM+Data: Case Study of Zhaoyuan Gold Mines, Shandong Province, China
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作者 刘福江 吴信才 +1 位作者 孙华山 郭艳 《Journal of China University of Geosciences》 SCIE CSCD 2007年第1期72-76,共5页
Satellite remote sensing data are usually used to analyze the spatial distribution pattern of geological structures and generally serve as a significant means for the identification of alteration zones. Based on the L... Satellite remote sensing data are usually used to analyze the spatial distribution pattern of geological structures and generally serve as a significant means for the identification of alteration zones. Based on the Landsat Enhanced Thematic Mapper (ETM+) data, which have better spectral resolution (8 bands) and spatial resolution (15 m in PAN band), the synthesis processing techniques were presented to fulfill alteration information extraction: data preparation, vegetation indices and band ratios, and expert classifier-based classification. These techniques have been implemented in the MapGIS-RSP software (version 1.0), developed by the Wuhan Zondy Cyber Technology Co., Ltd, China. In the study area application of extracting alteration information in the Zhaoyuan (招远) gold mines, Shandong (山东) Province, China, several hydorthermally altered zones (included two new sites) were found after satellite imagery interpretation coupled with field surveys. It is concluded that these synthesis processing techniques are useful approaches and are applicable to a wide range of gold-mineralized alteration information extraction. 展开更多
关键词 alteration information extraction Zhaoyuan gold mines landsat-7 Etm data
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基于Landsat TM数据估算雷竹林地上生物量 被引量:20
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作者 徐小军 周国模 +4 位作者 杜华强 董德进 崔瑞蕊 周宇峰 沈振明 《林业科学》 EI CAS CSCD 北大核心 2011年第9期1-6,共6页
结合Landsat TM遥感数据和雷竹林样地调查数据,采用偏最小二乘回归法(PLS)建立雷竹林地上生物量估算模型,利用该模型估算临安市雷竹林地上部分生物量。结果表明:雷竹单株地上部分生物量与胸径及雷竹林地上部分生物量与株数之间都呈极显... 结合Landsat TM遥感数据和雷竹林样地调查数据,采用偏最小二乘回归法(PLS)建立雷竹林地上生物量估算模型,利用该模型估算临安市雷竹林地上部分生物量。结果表明:雷竹单株地上部分生物量与胸径及雷竹林地上部分生物量与株数之间都呈极显著相关(P<0.01);通过PLS-Bootstrap法筛选自变量能够提高模型精度;模型预测的雷竹林地上生物量均方根误差为3.45t·hm-2,满足大范围估算的精度要求;临安市雷竹林地上生物量为13~25t·hm-2,均值为19.52t·hm-2。 展开更多
关键词 雷竹林 地上生物量 landsat tm遥感数据 偏最小二乘回归
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Landsat TM遥感影像中厚云和阴影去除 被引量:42
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作者 李炳燮 马张宝 +1 位作者 齐清文 刘高焕 《遥感学报》 EI CSCD 北大核心 2010年第3期534-545,共12页
提出了一种新的利用多时相LandsatTM影像数据进行的厚云及其阴影去除的方法。该方法通过分析厚云及其阴影的光谱特征,设计了厚云和云阴影识别模型。该算法的实现是采用图像配准技术、非监督分类、像元替换等运算,计算出厚云和云阴影区域... 提出了一种新的利用多时相LandsatTM影像数据进行的厚云及其阴影去除的方法。该方法通过分析厚云及其阴影的光谱特征,设计了厚云和云阴影识别模型。该算法的实现是采用图像配准技术、非监督分类、像元替换等运算,计算出厚云和云阴影区域的TM影像替换数据,进而得到消除或者减少云影响的TM遥感影像。试验结果表明本文提出的厚云及其阴影去除方法效果很好,能消除或者弱化云对TM影像数据的影响。 展开更多
关键词 landsat tm 厚云 云阴影 光谱特征分析 去云
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基于Landsat-TM数据的农牧交错带景观结构研究——以内蒙古自治区兴和县为例 被引量:23
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作者 江 源 高清竹 +1 位作者 何立环 王家骥 《应用生态学报》 CAS CSCD 2002年第4期403-408,共6页
根据1989年和 2000年的两期 Landsat-TM数据,应用景观类型斑块等级结构和景观空间格局指数等景观生态学指标,对地处典型农牧交错带地区的兴和县景观结构进行研究.结果表明,该地区农田和草地是平原和丘陵区的主体景观类型;不同景观类型... 根据1989年和 2000年的两期 Landsat-TM数据,应用景观类型斑块等级结构和景观空间格局指数等景观生态学指标,对地处典型农牧交错带地区的兴和县景观结构进行研究.结果表明,该地区农田和草地是平原和丘陵区的主体景观类型;不同景观类型斑块大小等级结构变化各异,耕地和草地斑块明显增大,乔木林地和水体斑块趋于减小;景观破碎化明显增强. 展开更多
关键词 Lansat-tm数据 内蒙古 兴和县 农牧交错带 景观结构 土地利用变化
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基于Landsat TM/ETM数据的锡林河流域土地覆盖变化 被引量:45
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作者 陈四清 刘纪远 +2 位作者 庄大方 肖向明 Steve Boles 《地理学报》 EI CSCD 北大核心 2003年第1期45-52,共8页
根据1987年、1991年、1997年和2000年4期Landsat TM/ETM影像的土地利用/土地覆盖分类结果,运用地理信息系统空间分析方法,分析了内蒙古锡林河流域1987~2000年间各土地利用类型及草甸草原、典型草原、荒漠草原的数量变化和空间变化特征... 根据1987年、1991年、1997年和2000年4期Landsat TM/ETM影像的土地利用/土地覆盖分类结果,运用地理信息系统空间分析方法,分析了内蒙古锡林河流域1987~2000年间各土地利用类型及草甸草原、典型草原、荒漠草原的数量变化和空间变化特征.分析结果显示,锡林河流域土地利用/土地覆盖变化的主要特征为草甸草原、典型草原面积的大幅减少和荒漠草原、农田和沙漠化土地面积的大幅增加及城镇的扩张.其中面积增加最大的是荒漠草原,增加了2328 km2;相当于1987年荒漠草原面积的56%.农出和城镇面积逐年增大,分别从1987年的114.3 km2和25.2 km2增加到2000年的332.1 km2和43.6 km2.面积减少最多的是羊草+丛生禾草、羊草+杂类草等优良高产温带典型草原类型,共减少2040km2.草甸草原面积亦呈逐年减少的趋势,从1987年的1103 km2减少到2000年375 km2,面积减少了65.9%.农出、沙化地及城镇等非草原土地利用类型面积增加了62.5%. 展开更多
关键词 landsattm/Etm数据 土地覆盖 锡林河流域 气候变化 土地利用/土地覆盖变化 沙漠化
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利用Landsat TM遥感数据监测冬小麦开花期主要长势参数 被引量:26
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作者 谭昌伟 王纪华 +5 位作者 赵春江 王妍 王君婵 童璐 朱新开 郭文善 《农业工程学报》 EI CAS CSCD 北大核心 2011年第5期224-230,共7页
为精准农业技术体系中的小麦农艺处方管理决策提供详尽的全局性信息,该文以2007-2009年试验实测数据为基础,以Landsat TM影像为遥感数据源,分析了试验样点开花期冬小麦主要长势参数与品质和产量间以及与卫星遥感变量间的相关性,分别建... 为精准农业技术体系中的小麦农艺处方管理决策提供详尽的全局性信息,该文以2007-2009年试验实测数据为基础,以Landsat TM影像为遥感数据源,分析了试验样点开花期冬小麦主要长势参数与品质和产量间以及与卫星遥感变量间的相关性,分别建立及评价了TM影像遥感变量监测冬小麦开花期SPAD值、生物量、叶面积指数和叶片氮含量的模型。结果表明:冬小麦开花期,选用作物氮反射指数、近红外波段反射率和归一化植被指数这些遥感变量分别反演冬小麦SPAD值、生物量、叶面积指数和叶片氮含量是可行的;SPAD值、生物量、叶面积指数和叶片氮含量遥感监测模型的精度较高,均方根误差分别为3.12、216.5kg/hm2、0.269和0.162,以此为基础,制作出具有实际农学意义的冬小麦开花期不同等级SPAD值、生物量、叶面积指数和叶片氮含量遥感监测专题图,实现了主要长势参数空间分布量化表达。基于卫星影像的农田面状信息获取技术克服了点状信息的不足,为农业生产管理决策及时提供信息支持,使该研究技术更利于大面积应用和推广。 展开更多
关键词 遥感 监测模型 主要长势参数估算 landsat tm 冬小麦
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基于单通道算法的HJ-1B与Landsat 5 TM地表温度反演一致性研究 被引量:24
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作者 罗菊花 张竞成 +3 位作者 黄文江 杨贵军 顾晓鹤 杨浩 《光谱学与光谱分析》 SCIE EI CAS CSCD 北大核心 2010年第12期3285-3289,共5页
针对传感器参数与Landsat 5 TM较为相近的环境减灾卫星HJ-1B的热红外数据是否能达到与TM6反演地表温度同样的效果的问题,作者获取了2009年4月15日覆盖北京地区相同范围的HJ-1B影像和Landsat 5 TM影像,采用Ji m啨nez-Mu oz和Sobrino的普... 针对传感器参数与Landsat 5 TM较为相近的环境减灾卫星HJ-1B的热红外数据是否能达到与TM6反演地表温度同样的效果的问题,作者获取了2009年4月15日覆盖北京地区相同范围的HJ-1B影像和Landsat 5 TM影像,采用Ji m啨nez-Mu oz和Sobrino的普适性单通道算法,通过遥感数据获取反演参数,对研究区的地表温度进行反演,并对两类数据反演结果的一致性进行了分析和评价。通过对反演结果的统计分析和分级填图表明,基于普适性单通道算法的HJ-1B与TM的热红外波段反演的地表温度在数值上和空间分布趋势上一致性较高。因此,具有较高时间分辨率和较大幅宽等优势的HJ-1B IRS数据在地表温度反演方面具有更大的潜力和应用范围。 展开更多
关键词 单通道算法 HJ-1B landsat 5 tm 地表温度
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使用LANDSAT-5TM数据反演金塔地表温度 被引量:40
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作者 孟宪红 吕世华 +1 位作者 张宇 张堂堂 《高原气象》 CSCD 北大核心 2005年第5期721-726,共6页
使用Landsat-5 TM的热红外波段资料,用Weng等、Qin等及Jimenez Mu^noz等三种不同的方法对金塔地区地表温度进行反演,并将反演得到的结果与实测值进行比较。结果表明,三种方法均能较好地反演出金塔绿洲地表温度的分布状况,其中,Weng等及... 使用Landsat-5 TM的热红外波段资料,用Weng等、Qin等及Jimenez Mu^noz等三种不同的方法对金塔地区地表温度进行反演,并将反演得到的结果与实测值进行比较。结果表明,三种方法均能较好地反演出金塔绿洲地表温度的分布状况,其中,Weng等及Qin等的反演方法反演的结果较好,绝对误差均<1.9°C;而Jimenez Mu^noz等的方法反演的结果较差。 展开更多
关键词 金塔绿洲 地表温度反演 landsat-5 tm资料 算法
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基于Landsat TM影像的冬小麦拔节期主要长势参数遥感监测 被引量:21
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作者 谭昌伟 王纪华 +4 位作者 朱新开 王妍 王君婵 童璐 郭文善 《中国农业科学》 CAS CSCD 北大核心 2011年第7期1358-1366,共9页
【目的】强化冬小麦长势遥感监测机制,为田间生产管理提供信息支撑。【方法】以2007—2009年试验实测数据为基础,以Landsat TM影像为数据源,分析试验样点拔节期冬小麦主要长势参数与品质、产量以及卫星遥感变量间的相关性,分别建立及评... 【目的】强化冬小麦长势遥感监测机制,为田间生产管理提供信息支撑。【方法】以2007—2009年试验实测数据为基础,以Landsat TM影像为数据源,分析试验样点拔节期冬小麦主要长势参数与品质、产量以及卫星遥感变量间的相关性,分别建立及评价了TM影像遥感变量监测冬小麦拔节期叶面积指数(LAI)、生物量、SPAD值和叶片氮含量(LNC)的模型。【结果】冬小麦拔节期,选用中红外波段的反射率(B5)、归一化植被指数(NDVI)、DSW5和绿波段的反射率(B2)等遥感变量分别反演冬小麦的SPAD值、生物量、LAI和LNC是可行的;SPAD值、生物量、LAI和LNC遥感监测模型的精度较高,以此为基础,制作出了具有实际农学意义的冬小麦拔节期不同等级SPAD值、生物量、LAI和LNC遥感监测专题图,实现了主要长势参数空间分布量化表达。【结论】研究结果可为广大农学家、农业部门决策者和田间管理人员提供及时的农情信息。 展开更多
关键词 冬小麦 landsat tm 拔节期 主要长势参数 监测模型
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基于Landsat TM图像的北京城市地表温度遥感反演研究 被引量:64
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作者 宫阿都 江樟焰 +2 位作者 李京 陈云浩 胡华浪 《遥感信息》 CSCD 2005年第3期18-20,30,i001,共5页
利用北京地区LandsatTM热红外波段数据,采用单通道算法反演得到北京地区地面温度分布图。从反演结果可以看出,北京城区地面温度比郊区地表温度高,郊区地表温度较低,密云水库、官厅水库等水体的温度最低,总体上北京城市热岛效应显著。地... 利用北京地区LandsatTM热红外波段数据,采用单通道算法反演得到北京地区地面温度分布图。从反演结果可以看出,北京城区地面温度比郊区地表温度高,郊区地表温度较低,密云水库、官厅水库等水体的温度最低,总体上北京城市热岛效应显著。地表比辐射率是通过Van经验公式反演得到,通过对比分析,表明该方法对自然地表的比辐射率反演效果较好。 展开更多
关键词 地表温度反演 landsat tm 单通道算法 城市热岛 北京
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基于Landsat TM数据的北京城市热岛研究 被引量:63
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作者 江樟焰 陈云浩 李京 《武汉大学学报(信息科学版)》 EI CSCD 北大核心 2006年第2期120-123,共4页
利用Landsat TM热红外波段数据,根据辐射传输方程反演得到北京地区地表温度,讨论了北京城市热岛现象及其与土地覆盖类型和植被指数的关系。结果显示,北京城区地表温度明显比郊区地表温度高。通过地表温度对比分析发现,城区平均地表温度... 利用Landsat TM热红外波段数据,根据辐射传输方程反演得到北京地区地表温度,讨论了北京城市热岛现象及其与土地覆盖类型和植被指数的关系。结果显示,北京城区地表温度明显比郊区地表温度高。通过地表温度对比分析发现,城区平均地表温度比近郊区和远郊区地表温度分别高出4.5℃和9℃,城市热岛效应明显。城区不同地表覆盖类型的地表温度也有显著差异,城市地表温度与NDVI具有明显的负相关关系,城市地表植被覆盖度低是城市热岛出现的主要原因。 展开更多
关键词 地表温度反演 landsat tm 辐射传输方程 城市热岛
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