内蒙古东乌旗遥感构造和蚀变信息提取与找矿预测     

钱建平  张渊  赵小星  赵少杰  李承礼 《国土资源遥感》2013,25(3)

为了研究内蒙古东乌旗Pb-Zn-Ag多金属成矿区的找矿远景,在对Landsat7 ETM+数据进行几何纠正、大气校正和去干扰等预处理的基础上,对多波段假彩色合成图像做滤波处理以增强区域构造信息、进行线性构造解译;运用分形几何学原理和计盒维数法求取线性构造分维值,得到线性构造的统计自相似性和分形特征;采用主成分分析和阈值分割法对图像进行铁染、羟基蚀变信息提取;最后根据区内线性构造、遥感蚀变信息、岩体分布特征、区域地球化学异常和已知矿床(点)分布资料综合分析,圈定出3个级别的7个找矿预测区,再次证实了基于遥感图像的线性构造和遥感蚀变异常信息可以作为找矿预测的标志.  相似文献   

Use of landsat ETM+ SLC-off segment-based gap-filled imagery for crop type mapping     

S. K. Maxwell  Michael E. Craig 《国际地球制图》2013,28(3):169-179

Failure of the Scan Line Corrector (SLC) on the Landsat ETM+ sensor has had a major impact on many applications that rely on continuous medium resolution imagery to meet their objectives. The United States Department of Agriculture (USDA) Cropland Data Layer (CDL) program uses Landsat imagery as the primary source of data to produce crop-specific maps for 20 states in the USA. A new method has been developed to fill the image gaps resulting from the SLC failure to support the needs of Landsat users who require coincident spectral data, such as for crop type mapping and monitoring. We tested the new gap-filled method for a CDL crop type mapping project in eastern Nebraska. Scan line gaps were simulated on two Landsat 5 images (spring and late summer 2003) and then gap-filled using landscape boundary models, or segment models, that were derived from 1992 and 2002 Landsat images (used in the gap-fill process). Various date combinations of original and gap-filled images were used to derive crop maps using a supervised classification process. Overall kappa values were slightly higher for crop maps derived from SLC-off gap-filled images compared to crop maps derived from the original imagery (0.3–1.3% higher). Although the age of the segment model used to derive the SLC-off gap-filled product did not negatively impact the overall agreement, differences in individual cover type agreement did increase (?0.8%–1.6% using the 2002 segment model to ?5.0–5.1% using the 1992 segment model). Classification agreement also decreased for most of the classes as the size of the segment used in the gap-fill process increased.  相似文献   

利用景观格局指数的空间分辨率对水域面积提取影响的分析     

熊金国  王世新  周艺  阎福礼 《武汉大学学报(信息科学版)》2011,(1):98-103

对8个不同地区对应的同一时间的ETM+数据和MODIS数据,利用谱间关系法得到30 m和250 m分辨率具有不同景观格局分布的水体专题图,研究分辨率对不同景观格局分布的水体提取的影响。通过比较发现,区域内水体边缘密度很小时,ETM+和MODIS提取结果的误差很小;当区域内水体边缘密度很大时,ETM+和MODIS提取结果的误差相应就变大。通过引入景观格局指数与两种分辨率的提取结果进行回归分析发现,对于不破碎区域的水体,MODIS和ETM+可以得到相近的精度;而对于中度破碎的水体,引入景观格局指数信息能显著地提高中度破碎水体的精度;但对于高度破碎的水体,通过引入景观格局指数信息的多元回归几乎不能提高精度。  相似文献   

ASTER与Landsat ETM~+热红外传感器数据的比较研究     

徐涵秋  张铁军  李春华 《武汉大学学报(信息科学版)》2011,(8):936-940,1007

利用3对同日过空的ASTER和ETM+影像对,开展了ETM+和ASTER热红外影像的定量比较,求出了二者的关系转换方程。定量研究结果表明,ASTER和ETM+热红外数据具有极显著的正相关关系,所求出的转换关系方程有很高的精度。但二者仍有一定的差异,表现在ASTER数据反演的传感器处温度要比ETM+平均高0.66℃~0.82℃,其所表现的热信息量也要比ETM+丰富且连续。  相似文献   

基于PDA环境下的测绘成图系统的设计与实现     

李东海  麻维 《测绘与空间地理信息》2014,(3):176-177,198

阐述了基于掌上电脑的外业测量数据采集系统的设计与实现,该方案既方便外业数据采集工作,又能适应野外数据采集环境。阐述了Windows CE环境下基于PDA的测绘成图系统开发的原理和方法,探讨了MapX Mobile组件用来开发的原则,实现了包括地图绘制、编辑、浏览和勘丈等功能。  相似文献   

基于IDL的岛屿岸线及港口码头的人工智能提取     

刘亚飞  潘洪军  王广伟  亓常松 《东北测绘》2014,(2):96-98

岛屿岸线的确定是海岛地物信息遥感调查中重要的一步,对舟山岙山岛的Quickbird高分辨率遥感影像进行地物地理信息分析,提取出岛屿岸线及港口码头的空间基本地物特征,在此基础上运用面向对象分类方法和数学形态学的知识,在ENVI＋IDL图形图像处理平台上实现对岛屿岸线及港口码头的自动提取,提取结果与实际情况基本符合,并且可以为人工智能提所有海岛地物信息的取做准备。  相似文献   

基于 SOFA 的 GCRS 与 ITRS 间坐标转换     

陈超  葛余超  张发奇  刘雄 《东北测绘》2014,(2):223-225

协议天球坐标系GCRS是一个准惯性坐标系,在研究卫星运动状态一般都是在这个坐标系下进行。国际地球参考系ITRS是我们常用的坐标系,一般性测量涉及的坐标都是这个坐标系。为了更方便地研究卫星问题,经常需要在这两个坐标系下进行转换。 IAU的标准基本天文程序库SOFA给出基本天文运算的库函数,利用这些库函数,可以方便地实现这两个坐标系的转换。基于SOFA的这些特点,利用C＋＋对GCRS与ITRS的坐标转换进行了研究。  相似文献   

Retrieving water surface temperature from archive LANDSAT thermal infrared data: Application of the mono-channel atmospheric correction algorithm over two freshwater reservoirs     

《International Journal of Applied Earth Observation and Geoinformation》2014

Water surface temperature is a key element in characterizing the thermodynamics of waterbodies, and for irregularly-shaped inland reservoirs, LANDSAT thermal infrared images are the best alternative yet for the retrieval of this parameter. However, images must be corrected mainly for atmospheric effects in order to be fully exploitable. The objective of this study is to validate the mono-channel correction algorithm for single-band thermal infrared LANDSAT data as put forward by Jiménez-Muñoz et al. (2009). Two freshwater reservoirs in continental France were selected as study sites, and best use was made of all accessible image and field data. Results obtained are satisfactory and in accordance with the literature: r² values are above 0.90 and root-mean-square error values are comprised between 1 and 2 °C. Moreover, paired Wilcoxon signed rank tests showed a highly significant difference between field and uncorrected image data, a very highly significant difference between uncorrected and corrected image data, and no significant difference between field and corrected image data. The mono-channel algorithm is hence recommended for correcting archive LANDSAT single-band thermal infrared data for inland waterbody monitoring and study.  相似文献   

Effect of salinity on the biosynthesis of amines in Litopenaeus vannamei and the expression of gill related ion transporter genes     

Luqing Pan  Hongyu Liu  Qun Zhao 《中国海洋大学学报(英文版)》2014,13(3):453-459

  相似文献   

煤矿安全培训过程的计算机仿真研究     

李隆  史小平  张宇 《中国煤炭地质》2011,(7):36-39,63

在煤矿开采过程中,降低事故风险和杜绝煤矿瓦斯爆炸隐患是当今煤矿生产行业的首要任务之一。对煤矿管理人员和井下作业人员进行安全生产和防灾、避灾知识和技能的培训也是必不可少的,而计算机仿真培训不失为一种好的方法。针对上述问题,通过研究现有安全培训系统所存在的问题,基于Visual C＋＋开发工具,研发了煤矿矿井安全培训的计算机仿真系统,实现了井下巷道系统模块、虚拟井下瓦斯模拟系统模块和工作安全培训模块等一系列功能,该系统在煤矿安全培训方面有着广阔的应用前景。  相似文献