一种利用流形学习进行多影像匹配的方法

提出了一种利用流形学习方法进行多影像匹配的算法。通过两组宽基线序列影像的匹配实验,并与LE-SIFT方法、SVD-SIFT方法和基于局部线性映射的LLE-SVD方法进行了对比分析。结果表明,本文方法在获得多幅影像的共同匹配结果和利用多幅影像之间的约束实现两幅影像匹配的结果上都优于现有方法。     

Geographical Notes

Abstract

This article describes the benefits of combining field-based learning within the context of a competitive setting in the geography curriculum. Findings and data are presented based on experiences gathered from teaching an upper-level university geography course that combined geographic techniques and theory into a game of capture-the-flag. Students analyzed a variety of geospatial data sources, using ArcMap Geographic Information System software, to prepare a series of maps for the game. Students reported a first-time understanding of many geographic skills that were previously ambiguous to them when the material was presented in a different format, such as lectures and labs.     

Learning by Doing: Implementing Community Service-based Learning

Abstract

Community-based Learning (CSBL) is based on the idea that learning is facilitated when the classroom is linked with real-world experience. This paper presents an overview of the pedagogical basis of community service-based learning (CSBL) and compares CSBL projects carried out in two very different settings. The findings indicate that in order to implement CSBL successfully, instructors need to plan ahead, develop partnerships with community organizations, and allow community groups to guide student projects. It is also important to recognize that the full benefits of CSBL are only gained when students, community members, and instructors spend time reflecting on the CSBL experience.     

Concept Learning through Writing for Learning: Using Journals in an Introductory Geography Course

Abstract

To effectively use journals and other writing for learning tasks as critical thinking and learning tools, geographic educators need to draw from the education literature on concept learning. Using the literature on concept learning and critical thinking, geographic educators can construct different kinds of journal assignments that give students opportunities to personalize and understand concepts. I demonstrate that students, regardless of their sex, level of education, or previous coursework in geography, found journal assignments helpful in understanding human geographic concepts.     

Editorial

Abstract

Project GeoSim is a multidisciplinary effort by members of Virginia Tech's Departments of Geography and Computer Science, College of Education, and Learning Resources Center to develop computer-aided education (CAE) software for introductory geography and related classes. GeoSim laboratory exercises draw on the five fundamental themes of geography for their subject matter. The programs emphasize interactive learning combining the information capabilities of Geographic Information Systems (GIS) with the techniques of computer simulation. The result is a series of geographic explorations that will make available some of the most exciting aspects of geography to a potential audience of 425,000 introductory geography students per year.     

Exploring Youth Cultures Geographically Through Active Learning

Abstract

This paper presents strategies for actively involving students in studying cultural geography through a research project on youth cultures. It provides a basic framework to investigate selected “subcultures” focusing on the origin and diffusion of each culture, its material and non-material aspects and the attributes and meanings of spaces used by each cultural group and youth cultures in the context of change. Students used a variety of methodologies to gather data and to describe and analyze the cultures selected. Of the eleven youth cultures investigated by the class, examples from the cultures of raves, skateboarding, and the Boy Scouts of America (BSA) are selectively presented to elucidate their geographic characteristics.     

Internet-Based GIS in an Inductive Learning Environment: A Case Study of Ninth-Grade Geography Students

Abstract

This article reports the results of a qualitative case study that explored the use of Internet-based geographic information systems (IGIS) with ninth-grade geography students. The students worked in teams to examine the geography of Africa using IGIS resources with the instructional goal of developing a presentation on a significant issue facing one region or country. The purpose of this study was to explore the use of IGIS as a tool for integrating geospatial technologies into ninth-grade geography curriculum and instruction within an inductive learning environment. The findings for this study indicate that IGIS can be a successful tool for geography education in an inductive learning environment. Based on qualitative data collected through classroom observations, focus group interviews with students, student work samples, and a teacher journal, two assertions are offered: students perceived expanded freedom as a positive aspect of this IGIS project and IGIS projects such as this can lead to gains in students' cultural awareness and empathy for distant others.     

Problem-Based Learning for Promoting Student Learning in High School Geography

ABSTRACT

This study determines the impact of problem-based learning on a preuniversity geography class. Learning activities include problem analysis, information collection, an examination of concepts, oral presentations, and group summaries in relation to current and perennial geographical issues of local and/or global concern. Assessment for learning and assessment of learning were done by the teacher, classmates, and students themselves. Results showed that students could analyze problem statements and present their understanding systematically but varied considerably in organization, argument, and quality of thinking. To seek improvements, teachers should become more active facilitators while encouraging students to learn as problem solvers. Teacher training and school-based support are needed for creating a collaborative inquiry-oriented atmosphere in the classroom.     

Positionality and Active Learning: Confronting Privilege in Field-Exercise Design

Abstract

University instructors are increasingly drawing on active learning exercises to engender critical thinking skills among students. In this article, we introduce the design and implementation of an active learning exercise about mobility and transportation that we assigned in an introductory human geography class at the University of Georgia. The students' responses and the survey instrument we used to assess the effectiveness of the exercise revealed disappointing results and caused us to think carefully about the role of positionality in designing active learning exercises. In this article, we argue that we need to understand privilege—particularly class privilege—in order to design effective assignments.     

Chile

Abstract

This study provides empirical information about the extent of geography instruction present in history classrooms. Techniques of protocol analysis were applied to oral references to geography made by teachers and students in 44 U. S. and European history lessons in several grades. The references were coded according to GENIP' s five themes plus a sixth coding category for explicit references to maps. Two types of references were found: passing references, which merely mentioned a geographic issue or feature, and substantive references, in which geography was taught or played a substantial role. That 550 geographic references occur in these lessons may explain why so many history teachers believe that they are adequately integrating geography and history. However, 75 percent of all the references were passing and not substantive. We conclude that the core epistemological events for learning and reasoning in, about, and with geography are not being taught adequately in history lessons.