GI_Forum最新文献_第8页

UAV-based Tree Height Estimation in Dense Tropical Rainforest Areas in Ecuador and Brazil 基于无人机的厄瓜多尔和巴西茂密热带雨林地区树高估算

GI_Forum Pub Date : 2019-01-01 DOI: 10.1553/giscience2019_02_s47

S. Reder, Lilli Waßermann, J. Mund

{"title":"UAV-based Tree Height Estimation in Dense Tropical Rainforest Areas in Ecuador and Brazil","authors":"S. Reder, Lilli Waßermann, J. Mund","doi":"10.1553/giscience2019_02_s47","DOIUrl":"https://doi.org/10.1553/giscience2019_02_s47","url":null,"abstract":"The aim of this study was to develop an easily applicable, cost-efficient workflow for tree height estimation in remote, inaccessible rainforest areas in Ecuador and Brazil. Structure from Motion (SfM) was combined with a digital terrain model (DTM) from the Shuttle Radar Topography Mission (SRTM) to complement relief information from photogrammetric point clouds (PPC) which represent the upper canopy layers. Based on ground points extracted from a 3D model, a vertical shift of the model was applied to adjust the ellipsoid level of the PPC. Digital surface models (DSM) of 22 research plots were normalized to canopy height models (CHM) to allow the estimation of relative tree heights in all research plots without using ground control points (GCP). The calculated tree height values indicate the applicability of the proposed workflow even in tropical rainforests with dense canopies. This approach allows the classification of canopy structures for identifying forest succession and other ecological forest monitoring purposes. The results highlight the potential of 3D models for tree height estimation derived from PPCs based on unmanned aerial vehicle (UAV) imagery in rainforest research.","PeriodicalId":29645,"journal":{"name":"GI_Forum","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75698773","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Traffic Noise Education in Secondary Schools: From Basic Understanding to Active Angagement 中学交通噪音教育:从基本了解到主动参与

GI_Forum Pub Date : 2019-01-01 DOI: 10.1553/giscience2019_02_s163

M.S.C.E. Vorage

引用次数: 0

Linguistic Landscaping at School - A Teaching Design 学校的语言景观——教学设计

GI_Forum Pub Date : 2019-01-01 DOI: 10.1553/giscience2019_02_s206

Manuel Huyer

引用次数: 1

Beyond 3D Building Modelling: Citizen Science for 3D Cultural Mapping 超越3D建筑建模:三维文化测绘的公民科学

GI_Forum Pub Date : 2019-01-01 DOI: 10.1553/giscience2019_02_s3

S. Chmielewski, Cait Bailey, A. Gawryluk

{"title":"Beyond 3D Building Modelling: Citizen Science for 3D Cultural Mapping","authors":"S. Chmielewski, Cait Bailey, A. Gawryluk","doi":"10.1553/giscience2019_02_s3","DOIUrl":"https://doi.org/10.1553/giscience2019_02_s3","url":null,"abstract":"This paper discusses a research-in-progress project engaging citizens in the collaborative 3D reconstruction of special urban features (SUFs) – visual works of art located in urban public spaces. While most artists modelling urban public spaces use basic 3D building models, these models do not include visual artworks. Because urban planners use artists’ models when designing urban public spaces, we believe it is necessary to incorporate SUFs into 3D city models to help urban planners and artists visualize urban spaces more effectively. To achieve this goal, we propose a bottom-up approach to the geographic visualization of SUF cultural assets (i.e. cultural mapping) which so far has not been undertaken as a citizen science project. The main aims of this project are to engage citizens in contributing to 3D SUF models and to familiarize them with citizen science. The method includes crowdsourcing SUF data and analysing it using ‘structure from motion’ (SfM) algorithms. After a 6-month campaign in Lublin, Poland, this project has so far resulted in 271 observations and 144 collaborative 3D models, creating a 3D open-data product which can be used for further culturally sensitive urban planning purposes.","PeriodicalId":29645,"journal":{"name":"GI_Forum","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73160787","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Blended Learning and Automated Evaluation in GIS Education GIS教育中的混合学习与自动化评估

GI_Forum Pub Date : 2019-01-01 DOI: 10.1553/giscience2019_02_s113

A. Czech, Robert Kalasek, Florian Pühringer

引用次数: 1

Comparing the Spatial and Temporal Activity Patterns between Snapchat, Twitter and Flickr in Florida 比较佛罗里达州Snapchat, Twitter和Flickr的时空活动模式

GI_Forum Pub Date : 2019-01-01 DOI: 10.1553/GISCIENCE2019_01_S134

L. Juhász, H. Hochmair

{"title":"Comparing the Spatial and Temporal Activity Patterns between Snapchat, Twitter and Flickr in Florida","authors":"L. Juhász, H. Hochmair","doi":"10.1553/GISCIENCE2019_01_S134","DOIUrl":"https://doi.org/10.1553/GISCIENCE2019_01_S134","url":null,"abstract":"Social media services generate enormous amounts of spatiotemporal data that can be used to characterize and analyse user activities and social behaviour. Although crowdsourced data have the advantage of comprehensive spatial and temporal coverage compared to data collected in more traditional ways, the various social media platforms target different user groups, which leads to user selection bias. Since data from social media platforms are used for a variety of geospatial applications, understanding such differences and their implications for analysis results is important for geoscientists. Therefore, this research analyses differences in spatial and temporal contribution patterns to three online platforms, namely Flickr, Twitter and Snapchat, over a six-week period in Florida. For the comparison of spatial contribution patterns, a set of negative binomial regression models are estimated to identify which socio-economic factors and characteristics of the built and natural environments are associated with contribution activities. The contribution differences observed are discussed in light of the targeted user groups and different purposes of the three platforms.","PeriodicalId":29645,"journal":{"name":"GI_Forum","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75482136","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 9

Expanding STEM Education in Secondary Schools: An Innovative Geography-Physics Course Focusing on Remote Sensing 扩展中学STEM教育:一门以遥感为重点的创新地理物理课程

GI_Forum Pub Date : 2019-01-01 DOI: 10.1553/giscience2019_02_s153

Claudia Lindner, Christina Müller, H. Hodam, C. Jürgens, Annette Ortwein, Johannes Schultz, Fabian Selg, A. Rienow

{"title":"Expanding STEM Education in Secondary Schools: An Innovative Geography-Physics Course Focusing on Remote Sensing","authors":"Claudia Lindner, Christina Müller, H. Hodam, C. Jürgens, Annette Ortwein, Johannes Schultz, Fabian Selg, A. Rienow","doi":"10.1553/giscience2019_02_s153","DOIUrl":"https://doi.org/10.1553/giscience2019_02_s153","url":null,"abstract":"A new elective school subject called ‘Geography-Physics’ was developed by the Universities of Bonn and Bochum in cooperation with a German high school. With a focus on remote sensing, the modules of this STEM subject convey information, and present methodology and applications. There are two main sections: the physics of remote sensing, including both mathematics and computer science, and the geographic applications. GIS is a major part of the exploitation of Earth Observation data, but the use of GIS and EO data is not feasible in school lessons due to financial and time constraints. Instead, small specialized GIS tools with embedded EO imagery are used. The tools were developed by two projects, FIS and Columbus Eye/KEPLER ISS, and evaluation and meetings with experts were conducted in close cooperation with the partner school. The first 2-year course of the new subject was completed in summer 2018. The teachers implementing the course have since re-evaluated their concept and revised the syllabus to enhance applicability in professional contexts, to reduce redundancies with other subjects, and to ensure that the overall content fits into the allotted number of teaching hours. The pupils also evaluated the materials and the subject.","PeriodicalId":29645,"journal":{"name":"GI_Forum","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84678216","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Parallel and Distributed Computing for large raster-based Spatial Multicriteria Decision Analysis Problems: A Computational Performance Comparison 基于栅格的空间多准则决策分析问题的并行和分布式计算:计算性能比较

GI_Forum Pub Date : 2019-01-01 DOI: 10.1553/giscience2019_01_s69

Christoph Erlacher, A. Desch, Karl-Heinrich Anders, P. Jankowski, Gernot Paulus

{"title":"Parallel and Distributed Computing for large raster-based Spatial Multicriteria Decision Analysis Problems: A Computational Performance Comparison","authors":"Christoph Erlacher, A. Desch, Karl-Heinrich Anders, P. Jankowski, Gernot Paulus","doi":"10.1553/giscience2019_01_s69","DOIUrl":"https://doi.org/10.1553/giscience2019_01_s69","url":null,"abstract":"This article focuses on a cluster-based parallel and distributed approach for large raster datasets in the context of Spatial Multicriteria Decision Analysis (S-MCDA). The research addresses a land-prioritization model with respect to conservation practices. The reliability of the model results is examined using a variance-based Spatially-Explicit Uncertainty and Sensitivity (SEUSA) framework. The original case study area to which we applied the model was located in southwest Michigan, USA, and incorporated millions of mapping units (pixels). As part of the model sensitivity analysis, several thousand intermediate raster datasets representing suitability surfaces are generated by means of a Monte Carlo Simulation (MCS). The creation of the suitability surfaces represents the most timeconsuming and memory-intensive step within the SEUSA framework. Sequential computational approaches to implementing SEUSA often have to accept a compromise with respect to problem size and the number of simulations, resulting in the low quality of the model sensitivity measures. This article presents the concept and implementation of a distributed and parallel solution based on the Python-Dask framework in order to improve the quality of SEUSA results for computationally-intensive spatial models.","PeriodicalId":29645,"journal":{"name":"GI_Forum","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77926772","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

From ‘The Map’ to an Internalized Concept. Developing a Method of Deconstruction as Practice for Reflexive Cartography 从“地图”到内化概念。发展解构方法作为反思性制图的实践

GI_Forum Pub Date : 2019-01-01 DOI: 10.1553/giscience2019_02_s194

Michael Lehner, J. Pokraka, Inga Gryl

引用次数: 3

Citizen Participation via Digital Maps: A Comparison of Current Applications 通过数字地图的公民参与:当前应用程序的比较

GI_Forum Pub Date : 2019-01-01 DOI: 10.1553/giscience2019_02_s34

Sven Schmuderer, Roland Zink, Werner Gamerith

引用次数: 2