基于决策树的机载LiDAR点云数据分类

本文采用基于决策树的人工智能方式,通过对点云数据分割、提取分割片轮廓,手动设置地物的约束条件来提取LiDAR点云中的地物。两组实验表明,本文的方法能够成功提取点云数据中的建筑物、车辆等地物;要提高精度,需增加点云密度,因此本文方法适用于较平坦的城镇地区。     

基于场景的不同类别不同粒度知识获取方法

本文提出基于场景的不同类别不同粒度知识获取方法,首先对此方法中场景、知识链、粒度的概念进行界定,从本质和整体上对该方法进行阐述,并通过实验证明此方法符合专题地图设计根本宗旨、能够有效获取不同类别不同粒度的知识,获取知识的结构属于高内聚、低耦合,具有易维护、易重复使用的优点。     

山东省TJ-Ⅱ型钻孔应变仪运行分析

介绍山东省TJ-Ⅱ型钻孔应变仪运行现状,通过研究M2波潮汐因子及相对中误差,衡量其总体精度和稳定性,结果表明,泰安地震台和青岛地震台的观测精度和稳定性较高,与钻孔的岩性和观测环境密不可分.     

地震前兆信息量计算软件研制及其操作说明

根据对前兆观测资料进行异常提取、时空综合分析的基本思路,研制了地震前兆信息量计算软件.该软件由13个子窗体、19个计算模块组成,分为工作区域、数据处理、前兆信息量计算、前兆信息量综合分析、显示打印等5个主控菜单.文中对每一主控菜单下的各计算模块的功能、输入与输出信息、计算结果存储与调用做了介绍.     

Promoting Local Growth: Process,Practice, and Policy

Electromap World Atlas, Version 1.1.

Interactive Population Statistical System, Version 1.0. Jerry W. Wicks and Jose Luiz Pereira de Almeida

MATHCAD, Version 2.5.

Memory Mate.

Micro DEM+, Version 5.21. Peter Guth

NCSS – Number Cruncher Statistical System, Version 5.02. Dr. Jerry L. Hintze     

THE GEOGRAPHY OF MASTODON EXTINCTION

Geographic Software Reviewed in this article:

LIFE TABLES and the LESLIE MATRIX. CONDUIT

MENTMAP2. Lawrence W. Carstensen Jr.

PC-MATLAB, Version 1.0. The Math Works, Inc.

QUICKMAP, version 1.0. Sammamish Data Systems, Inc.

SYSTAT: THE SYSTEM FOR STATISTICS, Version 2.1, Systat Inc.

USA DISPLAY. Instant Tecall     

An experiment on the elevation accuracy improvement of photogrammetrically derived DEM

This paper focuses on a topic barely considered in the literature: how to improve the accuracy of a given Digital Elevation Model (DEM) irrespective of its lineage by identifying its most suspicious values (also denoted here as outliers). Methods tailored to a specific procedure and source (contour maps, remote sensing image, etc.) exist but they are not valid for other cases. This is a problem for both the producer and end user. The results of a comparison of two methods using six DEMs intended to be representative of different landscapes are reported here. Both methods have been applied to each DEM, producing a number of height candidates to be analysed. Assuming that all candidates are wrong, their elevations have been blindly replaced by interpolated heights, simulating the behaviour of the inexperienced user. The improved (or degraded) DEMs are then compared against the ground truth, and updated accuracy figures are calculated. The RMSE can diminish by 2 to 8% of the original value by changing less than 1% of the elevations in the dataset.     

Ad hoc shared‐ride trip planning by mobile geosensor networks

Recent developments in miniaturization of computing devices, in location‐sensing technology and in ubiquitous short‐range wireless networks enable new types of social behaviour. This paper investigates one novel application of these technologies, ad hoc inner‐urban shared‐ride trip planning: Transportation clients such as pedestrians are seeking ad hoc shared rides from transportation hosts such as private automobiles, buses, taxi cabs or trains. While centralized trip planners are challenged by assigning clients and hosts in an ad hoc manner, in particular for non‐scheduled hosts, we consider the transportation network as a mobile geosensor network of agents that interact locally by short‐range communication and heuristic wayfinding strategies. This approach is not only fully scalable; we can also demonstrate that with short‐range communication, and hence, incomplete transportation network knowledge a system still can deliver near‐to‐optimal trips.     

Thematic signatures for cleansing and enriching place-related linked data

There has been significant progress transforming semi-structured data about places into knowledge graphs that can be used in a wide variety of geographic information systems such as digital gazetteers or geographic information retrieval systems. For instance, in addition to information about events, actors, and objects, DBpedia contains data about hundreds of thousands of places from Wikipedia and publishes it as Linked Data. Repositories that store data about places are among the most interlinked hubs on the Linked Data cloud. However, most content about places resides in unstructured natural language text, and therefore it is not captured in these knowledge graphs. Instead, place representations are limited to facts such as their population counts, geographic locations, and relations to other entities, for example, headquarters of companies or historical figures. In this paper, we present a novel method to enrich the information stored about places in knowledge graphs using thematic signatures that are derived from unstructured text through the process of topic modeling. As proof of concept, we demonstrate that this enables the automatic categorization of articles into place types defined in the DBpedia ontology (e.g., mountain) and also provides a mechanism to infer relationships between place types that are not captured in existing ontologies. This method can also be used to uncover miscategorized places, which is a common problem arising from the automatic lifting of unstructured and semi-structured data.     

Diplomacy and audit: Technologies of knowledge in Europe

This article investigates diplomatic knowledge production in Europe—mostly in European Union institutions but also in the member states—to probe the role of audit culture in that professional field. Diplomatic knowledge refers to the knowledge about places that is produced by career diplomats; audit culture refers to a form of regulatory power that shapes thought and action through the continuous application of measurable standards. Empirically, the analysis draws from nearly one hundred interviews with policy professionals, mostly but not exclusively in Brussels, to examine the play of qualitative and intangible skills in diplomatic work. Conceptually, it foregrounds the growing impact of audit in that sphere. I observe the narratives of efficiency, economy, and flexibility in European diplomacy, and I highlight tensions around the value of different forms of knowledge in the profession. By foregrounding the intellectual and creative facets of diplomatic work and by examining the impact of audit culture on the profession, the article helps us understand how diplomats produce knowledge about the world. It thereby enriches geographical scholarship on geopolitical knowledge and policy processes.