长春市深部地下水赋存规律之我见

长春市北西或北北西向扭性断裂或断裂带是客观存在，它对长春市深部地下水循环与循存起控制作用，是深部基岩裂隙水的主要导水通道，且大都为富水带。原北东向压扭性断裂或断裂带起阻水作用，二者相得益彰。笔者于长春北郊贫水区，利用这一新理论，在水文地质调查基础上，结合多种水文物探手段布孔凿井，打出一口水量丰富的优质矿泉水井，进而验证了北西向富水说，了箕市深部地下水赋存规律的新认识，此说不但对长春市供水有实际意义     

Mapgis SCS G2000在1∶1万数字化制图中的应用

本文介绍了M apg is、SCS G 2000软件在1∶1万比例尺地形图生产中的特点及利用软件的各自优点进行数字化的过程。     

Morphology and internal structure of a dormant landslide in a hilly area: The Collinabos landslide (Belgium)

This study attempts to reconstruct the history of the Collinabos landslide, a landslide with a fresh morphology that is representative for more than 150 dormant, deep-seated (> 3 m) landslides in the Flemish Ardennes (Belgium). A geomorphological map was created based on LIDAR (Light Detection and Ranging)-derived maps and detailed field surveys. The map showed that the landslide consisted of three zones with significant differences in surface topography. The northern landslide zone 1 is characterised by at least five reverse slopes, whereas zones 2 and 3, the southern landslide zones, have only two reverse slopes and a convex foot. Electric resistivity profiles measured in zones 1 and 2 revealed that the differences in surface topography were not related to differences in internal structure as both parts of the landslide were initiated as a rotational earth slide with a surface of rupture at 15 m deep, where the displaced material broke apart in two blocks. However, two shear surfaces of reactivations within landslide debris were only distinguished in the accumulation area of zone 1. The observed differences in surface morphology can be caused by a temporary conversion of a forest into cropland in zone 2. It is suggested that reverse slopes of smaller reactivations within landslide debris were obliterated during the agricultural activities. AMS radiocarbon dating of organic material found in ponds located in reverse slopes generally resulted in relatively recent dates (i.e. 1400–1950 Cal AD) suggesting that several of the small local reactivations occurred in that period. One dating at 8700–8440 Cal BP of organic matter collected in a reverse slope in zone 1 suggests that an initiation under periglacial conditions cannot be excluded for the Collinabos landslide. By combining different technologies, this study provides valuable information for a better understanding of dormant landslides.     

Mapping landslide susceptibility from small datasets: A case study in the Pays de Herve (E Belgium)

A landslide susceptibility map is proposed for the Pays de Herve (E Belgium), where large landslides affect Cretaceous clay outcrop areas. Based on a Bayesian approach, this GIS-supported probabilistic map identifies the areas most susceptible to deep landslides. The database is comprised of the source areas of ten pre-existing landslides (i.e. a sample of 154 grid cells) and of six environmental data layers, namely lithology, proximity to active faults, slope angle and aspect, elevation and distance to the nearest valley-floor. A 30-m-resolution DEM from the Belgian National Geographical Institute is used for the analysis. Owing to the small size of the sample, a special cross-validation procedure of the susceptibility map is performed, which uses in an iterative way each of the landslides to test the predictive power of the map derived from the other landslides. Four different sets of variables are used to produce four susceptibility maps, whose prediction curves are compared. While the prediction rates associated with the models not involving the “proximity to active fault” criterion are comparable to those of the models considering this variable, strong weaknesses inherent in the fault data on which the latter rely suggest that the final susceptibility map should be based on a model that excludes any reference to fault. This highlights the difference between a triggering factor and determining factors, and in the same time broadens the scope of the produced map. A single reactivated slide is also used to test the possibility of predicting future reactivation of existing landslides in the area. Finally, the need for geomorphological control over the mathematical treatment is underlined in order to obtain realistic prediction maps.     

1∶5万土地利用现状图编绘概述

1∶5万土地利用现状图是土地利用研究的基础数据之一。实际工作中,通常是以1∶1万(1∶2.5万)土地更新调查底图为基础,采用放大编绘法或等大编绘法,按照一定的顺序来制作的。总的来说,编绘主要是针对图内的点状要素(三角点、埋石点、高程点)、线状要素(河流、道路、境界等)和面状要素(各类用地)3个方面进行的。通过对点状要素的取舍、线状地物的弯曲、相互关系、移位和地物压盖以及面状地物的地类合并与综合等问题进行处理,就可以得到主次分明、清晰易读、关系合理的1∶5万土地利用现状图。     

基于Flash技术的专业互动多媒体网络地图的构建

在介绍专业互动多媒体网络地图及Flash技术特点的基础上，分析利用Flash技术构建专业互动多媒体网络地图的解决方案，并着重讨论在Flash技术支持环境中地图数据在客户端与服务端的获取与组织方式，以及实现地图信息查询的方法。     

房产测绘管理系统软件开发中的若干问题

介绍了房产测绘管理系统开发过程中的几个关键的问题。分别对房产测绘管理系统的开发、运行环境、系统功能以及功能实现中的技术问题等进行了分析和探讨。     

基于COM技术的地图符号库结构设计与实现

从符号库的结核设计入手，提出了一种新的符号库模型－双层地图符号库模型。该模型在速度，质量上继承了其他模型的优点。利用COM技术实现了地图符号库设计系统，该系统在符号库的易挂接性和符号的可扩展性上有了很大的提高。     

土地利用数据综合中的聚合与融合

针对土地利用图中多边形地块具有全覆盖、无重叠、语义上多层次的特点对土地利用数据综合中的地块合并给出了多边形聚合与多边形融合两种操作；前者针对具有同属性的语义邻近地块的合并，后者针对不同属性的拓扑邻近地块的合并；两种操作的区分是基于同时顾及空间、语义特征的邻近分析，算法的实现均建立在Delaunay三角网模型上由骨架线支持；详细讨论了两种操作的算法过程并给出了实际数据的实验结果。