遥感影像分析在新增建设用地督察中的应用

以卫星影像大数据和时空数据挖掘技术为基础,采用深度学习框架支撑,构建了面向新增建设用地遥感监测应用需求的深度学习训练平台,可智能发现自然资源督察线索,全面提高自然资源督察问题的发现能力.该技术可广泛服务于大范围、高频次的督察工作,为督察工作提供更及时客观全面的信息基础和保障.     

一种GIS空间知识分析的影像纹理尺度提取算法

本文提出了一种基于GIS领域空间知识的影像纹理尺度提取方法:该方法分析了GIS领域知识辅助下人类对纹理特征的认知过程,对4个步骤的具体实现算法进行探讨;并选取海南省昌江县作为研究区域,实验证明了本方法的有效性,且与传统的枚举法相比,在性能相近的情况下其效率显著提高,更适合于大数据量遥感影像分类运算。     

利用ETM+影像自动提取河流冲积扇的方法

本文在分析冲积扇与其他地物光谱特征差异的基础上,针对Landsat ETM+影像中红光波段与近红外波段的比值能够增大冲积扇与其他地物间差异的特征及地形阴影在蓝绿光波段亮度值降低速率差异较大的特征,基于比值运算、差值运算,构建了冲积扇指数;并利用该模型阈值自动选取算法将冲积扇信息从其他地物及阴影中分离出来,然后根据数学形态学膨胀滤波算法进行空洞填充。经过实验表明,该方法能够高效自动地提取华南山区的冲积扇信息。     

Blending Aggregation and Selection: Adapting Parallel Coordinates for the Visualization of Large Datasets

Abstract

Many of the traditional data visualization techniques, which proved to be supportive for exploratory analysis of datasets of moderate sizes, fail to fulfil their function when applied to large datasets. There are two approaches to coping with large amounts of data: data selection, when only a portion of data is displayed, and data aggregation, i.e. grouping data items and considering the groups instead of the original data. None of these approaches alone suits the needs of exploratory data analysis, which requires consideration of data on all levels: overall (considering a dataset as a whole), intermediate (viewing and comparing collective characteristics of arbitrary data subsets, or classes), and elementary (accessing individual data items). Therefore, it is necessary to combine these approaches, i.e. build a tool showing the whole set and arbitrarily defined subsets (object classes) in an aggregated way and superimposing this with a representation of arbitrarily selected individual data items.

We have achieved such a combination of approaches by modifying the technique of parallel coordinate plot. These modifications are described and analysed in the paper.     

高密度电法在探测隐伏断裂带中的应用

本文介绍了高密度电法的原理及工作方法,并应用高密度电法对龙门山断裂区的隐伏断裂带进行了勘测。实验结果表明了高密度电法,是探测隐伏断裂带的行之有效的方法。     

红层“哑地层”划分对比方法——以东营凹陷南坡始新统为例

针对红层划分对比所面临的难题,在充分吸收前人研究成果的基础上,将现有的多种分层方法相互整合,彼此约束和印证,形成了一套科学、便捷的技术方法,即"接触关系明顶底、岩电特征找界面、多元融合定方案、地震约束建格架"的综合地层划分对比技术。该方法针对红层的特殊性,根据岩电特征对干旱气候的响应变化,充分利用了测、录井资料纵向上的连续性优势(避免了取样分析的局限),以及地震资料横向上的优势,有效地解决了红层纵向划分、横向对比的难题,在济阳坳陷东营凹陷南坡始新统沙河街组、孔店组的应用取得了良好效果。该方法可为其它地区同类复杂地层划分对比提供技术支持。     

Calcified roasting-acid leaching process of vanadium from low-grade vanadium-containing stone coal

The low-grade vanadium-containing stone coal used in this experiment was collected from Wuxi Coun- try, Chongqing City, China. The experiment focused on the vanadium recovery from roasted residue through opti- mizing the process conditions of an effective and environmentally-friendly technology, named calcified roast- ing-sulfuric acid leaching technology. By single-factor experiments and orthogonal experiments, the effects of roast- ing temperature, roasting time, sulfuric acid concentration and leaching time on the leaching ratio of vanadium were analyzed. The results showed that the leaching ratio of vanadium reached 85.5% under the proper technological con- ditions of roasting temperature=950℃, roasting time=4 h, 40% concentration of sulfuric acid and leaching time=6 h.     

难浸金矿石电场强化电离—氰化提金试验

对硫、砷、炭（泥）含量较高的难浸金矿石,采用电场强化电离－氰化提金新工艺进行试验,从理论上对方法原理者了讨论,并通过试验对比,证明该方法较规氰化提金方法提高了金浸出率（８％～８０％）,缩短了浸出周期（为原周期的１／４～２／３）。经野外堆浸试验,肯定了方法的可行性。     

超声提取-气相色谱法测定覆盖区土壤中的六六六和滴滴涕

将超声波提取技术引入到覆盖区土壤样品六六六、滴滴涕组分的预处理中,建立了超声提取,磺化法净化,气相色谱测定的分析方法。对被测组分在超声波提取中的稳定性进行了试验,对超声提取时间、提取温度、提取溶剂用量以及磺化净化过程可能导致组分损失的各种相关条件逐个试验筛选,采用样品加标回收法对六六六、滴滴涕的8种组分进行了两种浓度的精密度和准确度试验,RSD值均小于10％,平均回收率92．5％-103．9％。方法对各种异构体的六六六、滴滴涕的最低检测浓度为0．30-3．89ng／g。     

Hydrous pyrolysis of a Type III source: fractionation effects during primary migration in natural and artificially matured samples

A core from the Cambay Shale Formation of the Cambay Basin, containing immature Type III organic matter, was pyrolysed at 300°C for different durations of time to different maturation levels. Fractionation effects were studied employing a three-step extraction technique after removal of the expelled pyrolysate. The extractable organic matter (EOM) obtained on extraction of the whole core is assumed to be that present in open pores, while that obtained on finely crushing the sample is assumed to be that present in closed pores. The EOM obtained from 1 cm chips is termed EOM from semi-open pores. The gross composition of the pyrolysates expelled during pyrolysis is not similar to the oils reservoired in the area, and there is no significant fractionation observed between expelled pyrolysates and unexpelled EOM. Our study indicates movement of fluids between closed, semi-open and open pores. In both systems, there is a higher concentration of EOM in open pores than in semi-open and closed pores, and the fraction of EOM in open pores is much greater in the artificial system than in the natural system. Fractionation effects on n-alkane and isoprenoid hydrocarbon-based parameters were also studied. n-Alkenes are present in semi-open and closed pores of the immature core and in the core after it was pyrolysed to 300°C for 6 and 48 h, but are absent in the open pores. n-Alkenes are present in closed pores in the naturally matured core. Presence of n-alkenes in the pyrolysates expelled during the 6 and 48 h experiments, but their absence in the open pores of the core, indicates that expulsion also occurs through temporary microfractures during laboratory pyrolysis, whereas in the natural system expulsion from closed pores seems to be only via semi-open and open pores.