According to the glacier characteristics of remote sensing image, a context-aware deep learning semantic segmentation network for glacier extraction is proposed based on the glacier characteristics of remote sensing image. Firstly, resnet50 is introduced as the feature extraction network to achieve the accuracy and efficiency balance of glacier feature extraction. Secondly, the context-information learning of the existing semantic segmentation network is designed. The context information including the dilated-convolutional block and the max-pooled block is designed to better extract the context information of the glacier. Multiple remote sensing trained images and tested images are selected for experiment, which is qualitatively and quantitatively compared with the existing glacier feature index extraction method and other semantic segmentation network methods. The results show that the network method in the frozen lake surface, the leakage of the mountain shadow, cloud shadow and the integrity of the extraction results have a good effect, which verifies the effectiveness and robustness of the proposed method.

以3 m级TerraSAR卫星数据为例,对广西省南宁市主城区进行D-InSAR干涉测量,并结合同期土地资源全天候建设用地监测成果进行相关度分析.结果表明,主城区有两个较大的沉降漏斗,沉降趋势由城区向郊区减缓,一定程度上表明该地区的沉降并非自然地壳运动形成.进一步研究表明,高沉降漏斗区域的地下水开采及矿产开采较为严重,并且建设用地与沉降结果整体相关系数达到了0.78,建设密集区域均伴随着不同程度的沉降.根据该区域D-InSAR沉降结果,城市建设应向高稳定性、低沉降区域进行.

[Objective] To study the spatial-temproal evolution characteristic of Cd pollution in the agricultural soil.[Method] Taking Xiaoxi river basin of Liuyang in Hunan Province as the study area, soil samples were collected according to the soil depth for determination of cadmium content in the soil.Using different evaluation standards and methods, cadmium pollution in agricultural soil was evaluated.With the aid of statistical and GIS spatial interpolation method, spatial distribution of soil cadmium content were analyzed within the scope of the study area in the form of visual.[Result]The result showed that reference criteria of the soil cadmium content using the national secondary standard or the natural background value evaluation standard, the heavy metal cadmium content in the shallow layer from 0 to 10 cm depth cultivated soils exceeded the pollution index, which indicated in shallow layer soil interference by human activities was larger.[Conclusion] Major source of cadmium pollution is the cadmium in phosphate fertilizer, it results in enormous potentially risky to water quality.

随着国产卫星技术的快速发展,国家加大了对其研发和应用力度.湖南省土地管理工作紧跟国产卫星发展潮流,积极探索本地化的国产卫星技术的应用与推广模式,开展多项示范应用工程并取得了实质性的突破,结合应用中存在的瓶颈问题,提出了合理化发展建议,进一步促进了国产卫星遥感数据在湖南省国土资源工作中的应用的市场化、商业化和产业化的发展.

针对当前主流单维度地应变分析方法难以全面反演地壳动态迁移及其趋势,无法精确反映应变与地震相关性的问题,该文提出利用多维参量解析法进行全方位地壳应变分析.利用2011-2014年GAMIT解算得到的高精度GNSS坐标时间序列经过模型化拟合得到的ITRF08框架下的川滇地区速度场,并去除欧亚板块欧拉矢量速度场进行Delaunay三角形构网,解算得到了川滇地区的主应变率场、最大剪切应变率场、面膨胀率场.研究结果表明,最大剪切应变率高值区域及面膨胀率梯度较大区域与地震的发生存在较强的相关性,地壳动态迁移趋势性体现比以往常规研究显著占优;多维参量解析法从更丰富的数据维度反演了川滇区域地壳活动状态.