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QuickBird遥感影像的融合及在农业园区底图制作中的应用研究 总被引：4，自引：0，他引：4
应用比值变换、IHS变换、主成分变换和合成比值变量变换等4种影像融合方法对QuickBird多光谱和全色遥感影像进行融合,并利用偏差指数、平均梯度等指标对融合效果进行定量评价;运用最佳指数因子确定参与成图的多光谱影像的波段．研究结果表明,合成比值变量变换法的融合效果最佳;最优波段组合为431,并在此基础上建立了地物判读分析依据,用于QuickBird遥感影像目视解译;采用容差格网矢量化技术进行遥感影像的屏幕矢量化,制作了1：2000比例尺农业园区底图。 相似文献
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INTRODUCTIONInthelastdecade,remotesensinghasbeenincreasinglyidentifiedasanobjective,standardized,possiblycheaperandfastermethodologyforcropproductionsurveysthanconventionalfieldinves-tigations(Bauman,1992).Muchprogresshasbeenmadethroughintensivestudiesoninventoryandproductionforecastingformajorcrops,suchaswheat,rice,cottonandmaize(Tennakoonetal.,1992;Rayetal.,1994;Fangetal.,1998).China,adevelopingcountrywith1.2billionpeople,hasbeenpayingcloseattentiontoitsex-istingandfuturefoodproduction… 相似文献
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水稻土SOM含量高光谱模型的母质差异性研究 总被引：3，自引：0，他引：3
以青紫泥(BlueclayeyPaddysoil,BP)和红黄泥(RedPaddysoil,RP)为例,研究发育于不同成土母质的水稻土SOM含量高光谱模型的差异性.结果表明,发育于河湖沉积物的BP与发育于第四纪红色粘土母质的RP,因为土壤中所含粘土矿物的不同,加上有机质组份的差异,其SOM含量高光谱模型具有母质的独特性.无论以反射系数为自变量或是以反射系数一阶微分为自变量,BP与RP的SOM含量高光谱模型在模型所包含波段的个数和位置都有较大的差异. 相似文献
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利用地统计学工具对浙江省上虞市海涂围垦区土壤电导率和有机质进行了空间变异性研究,同时利用多时相陆地卫星影像进行了围垦区范围变化和土地利用变化监测。结果表明,土壤特性由于生产管理实践的不同而发生了较大的变异,最新围垦的土壤具有较好的异质性,而较早围垦的土壤的异质性较差,其中电导率整体随围垦历史的增加呈明显的下降趋势,其变异程度最大,而土壤有机质则随围垦历史的增加呈上升趋势。从1969年到1996年,样区内新增围垦土地15668 hm2。不同时期围垦的土地,其主要利用类型有着明显的差异,从新围垦区裸露的盐碱地和水产养殖塘,逐步过渡到棉花田及老围垦区的水稻田和果园,反映了该地区土壤特性变异对土地利用类型的影响。 相似文献
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Automated soil resources mapping based on decision tree and Bayesian predictive modeling 总被引：1，自引：0，他引：1
This article presents two approaches for automated building of knowledge bases of soil resources mapping.These methods used decision tree and Bayesian predictive modeling,respectively to generate knowledge from training data.With these methods,building a knowledge base for automated soil mapping is easier than using the conventional knowledge acquisition approach.The knowledge bases built by these two methods were used by the knowledge classifier for soil type classification of the Longyou area,Zhejiang Province,China using TM bi-temporal imageries and GIS data.To evaluate the performance of the resultant knowledge bases,the classification results were compared to existing soil map based on field survey.The accuracy assessment and analysis of the resultant soil maps suggested that the knowledge bases built by these two methods were of good quality for mapping distribution model of soil classes over the study area. 相似文献
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Remote sensing techniques have the potential to provide information on agricultural crops quantitatively, instantaneously
and above all nondestructively over large areas. Crop simulation models describe the relationship between physiological processes
in plants and environmental growing conditions. The integration between remote sensing data and crop growth simulation model
is an important trend for yield estimation and prediction, since remote sensing can provide information on the actual status
of the agricultural crop. In this study, a new model (Rice-SRS) was developed based mainly on ORYZA1 model and modified to
accept remote sensing data as input from different sources. The model can accept three kinds of NDVI data: NOAA AVHRR(LAC)-NDVI,
NOAA AVHRR(GAC)-NDVI and radiometric measurements-NDVI. The integration between NOAA AVHRR (LAC) data and simulation model
as applied to Rice-SRS resulted in accurate estimates for rice yield in the Shaoxing area, reduced the estimating error to
1.027%, 0.794% and (−0.787%) for early, single, and late season respectively. Utilizing NDVI data derived from NOAA AVHRR
(GAC) as input in Rice-SRS can yield good estimation for rice yield with the average error (−7.43%). Testing the new model
for radiometric measurements showed that the average estimation error for 10 varieties under early rice conditions was less
than 1%.
Project supported by the National Defense Scientific and Technological Committee of China(No. Y97#14-6-2) 相似文献
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INTRODUCTIONPigmentsarecloselyrelatedtothephysiolog icalfunctionofleaves.Chlorophyllsabsorblightenergyandtransferitintothephotosyntheticpro cess.Carotenoids (yellowpigments)canalsocontributeenergytothephotosyntheticsystem .Becauseoftheimportanceofpigments… 相似文献