Change search
Refine search result
1 - 13 of 13
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Rows per page
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sort
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
Select
The maximal number of hits you can export is 250. When you want to export more records please use the Create feeds function.
  • 1.
    Andersson, Tonny
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
    Öppna JavaScript-bibliotek för webbkartor i kommunal tjänst: En jämförelse mellan OpenLayers 3 och Leaflet2015Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The use of web-based mapping applications is constantly increasing. In particular, an increase can be observed in the mobile use of such applications. Karlstad municipality is experiencing an increased number of mobile users of its web map. For that reason, the municipality aims to improve their web map in order to provide a more mobile-friendly service. The municipality intends to replace the technology of their existing web map with a more modern alternative and is currently looking at two different JavaScript-based open source APIs for web-based mapping applications – OpenLayers 3 and Leaflet.In this thesis, OpenLayers 3 and Leaflet are compared in terms of compatibility, functionality and performance. Compatibility and functionality are examined primarily through analysis of available documentation. Assessments are made based on requirements set forth by Karlstad municipality, regarding compatibility with existing server architecture and functionality equivalent to the municipality’s current web mapping service.Performance is assessed for WMS and WFS functions, and functions for file based vector data rendering. In addition, differences in performance with various web browsers are evaluated. The performance tests are carried out in environments set up as basic mapping applications. Given functions are tested with simple script methods for timing, together with Firebug, a Firefox web browser plugin.Test results show that both OpenLayers 3 and Leaflet meet all requirements regarding compatibility, even though Leaflet lacks support for certain formats. OpenLayers 3 shows, furthermore, a broader native support for different functions. Leaflet is more limited, natively, but can be extended through various plugins to achieve the same level of functionality as OpenLayers 3.Performance tests consistently show that OpenLayers 3 is the faster API. The results are particularly clear concerning vector data handling, where Leaflet is significantly slower. Despite distinct and measurable differences in performance, the perceived differences are not always as obvious. For this reason, practical user-focused tests are recommended for future studies of the subject.In conclusion, OpenLayers 3 is the recommended API for use in applications of larger scale and with richer functionality, while Leaflet is proposed as a more flexible alternative, suitable for simpler applications.

  • 2.
    Bergman, Ann
    Karlstad University, Faculty of Arts and Social Sciences (starting 2013), Karlstad Business School (from 2013).
    Gender, work and disaster2012In: Gender, work and disaster, 2012Conference paper (Refereed)
  • 3.
    Blumenthal, Barbara
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Centre for Climate and Safety (from 2013).
    Nederbördsintensitet och andra faktorer som påverkar skyfallsskador2018Licentiate thesis, comprehensive summary (Other academic)
    Abstract [sv]

    I Sverige inträffar många skyfall och intensiva regn under sommarmånaderna. Det finns inga uppenbara geografiska mönster, vilket är en skillnad gentemot älv- eller sjööversvämningar där det vanligtvis är känt vilka områden som kan komma att översvämmas vid en viss vattennivå eller ett visst vattenflöde. För individer och samhällsaktörer innebär en skyfallshändelse i många fall en stor överraskning då skyfall utvecklas snabbt och dagens meteorologiska prognossystem i stort inte lyckas att prognosticera extrema regn korrekt med avseende på mängd, tid och plats. Vädervarningar kommer med kort varsel eller uteblir helt. Konsekvenserna av intensiv nederbörd och skyfall är främst översvämningar och erosionsskador på byggnader och infrastruktur, men även störningar och avbrott i olika samhällsfunktioner som kan påverka samhället och individer utanför det drabbade området.

    I denna avhandling har 15 år av försäkringsskadedata använts för att undersöka samband mellan nederbördsintensitet och skyfallsskador. Även påverkan av andra faktorer som topografi, bebyggelse och socioekonomiska aspekter har undersökts. Resultaten visar att regnintensitet under ett 60 minuters intervall i kombination med korta perioder av extrem intensitet, tillsammans med topografiska faktorer spelar en betydande roll vid uppkomsten av skador.

  • 4.
    Blumenthal, Barbara
    et al.
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Centre for Climate and Safety (from 2013). Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences (from 2013).
    Haas, Jan
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences (from 2013).
    Andersson, Jan-Olov
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Centre for Climate and Safety (from 2013).
    A GIS-based multivariate approach to identify flood damage affecting factorsManuscript (preprint) (Other academic)
    Abstract [en]

    This paper investigates causal factors leading to pluvial flood damages, beside rainfall amount and intensity, in two Swedish cities. Observed flood damage data from a Swedish insurance database, collected under 13 years, and a set of spatial data, describing topography, demography, land cover and building type were analyzed through principal component analysis (PCA). The topographic wetness index (TWI) is the only investigated variable that indicates a significant relationship with to the number and amount of insurance damage. The Pearson correlation coefficient is 0.68 for the number of insurance damages and 0.63 for amount of insurance damages. With a linear regression model TWI explained 41% of the variance of the number of insurance flood damages and 34% of variance of amount of insurance flood damage.

    Future studies on this topic should consider implementing TWI as a potential measure in urban flood risk analyses.

  • 5.
    Blumenthal, Barbara
    et al.
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Centre for Climate and Safety (from 2013).
    Nyberg, Lars
    Karlstad University, Faculty of Social and Life Sciences, Centre for Climate and Safety. Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences (from 2013).
    The impact of intense rainfall on insurance losses in two Swedish cities2018In: Journal of Flood Risk Management, ISSN 1753-318X, E-ISSN 1753-318XArticle in journal (Refereed)
    Abstract [en]

    While a major part of previous research in the field of flood damage has focused on water depth as the most important causal factor, little attention has been paid to the role of rainfall intensity. As a test, this paper used correlation and regression analyses to investigate rainfall intensity as a factor affecting flood damage. For a time period of 15 years, the relationship between insurance losses caused by floods and rainfall intensity data from rain gauges were examined in two Swedish cities. Another objective was to find an approach for damage functions based on rainfall intensity as explanatory variable. Using linear regression, two approaches with considerable high degrees of explanation were found – one based on an exponential function and one on a power function. Using a lower limit for rainfall intensity, the approaches reached degrees of explanation between 30 and 78 %. From this study it was concluded that rainfall intensity during the summer months and the occurrence of insurance damages per day caused by floods were correlated and further that rainfall intensity has a great potential to explain urban flood damages. In the future, additional studies are needed to validate the proposed methods and integrate other flood damage affecting factors in the approach.

  • 6. Cafaro, Philip
    et al.
    Butler, Tom
    Crist, Eileen
    Cryer, Paul
    Dinerstein, Eric
    Kopnina, Helen
    Noss, Reed
    Piccolo, John
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences (from 2013).
    Taylor, Bron
    Vynne, Carly
    Washington, Haydn
    If we want a whole Earth, Nature Needs Half: a response to Buscher et al.2017In: Oryx, ISSN 0030-6053, E-ISSN 1365-3008, Vol. 51, no 3, p. 400-400Article in journal (Refereed)
  • 7.
    Daniel, Palm
    Karlstad University, Faculty of Health, Science and Technology (starting 2013).
    Sammanställning av användarerfarenheter med nya nationella höjdmodellen, NNH2017Independent thesis Basic level (university diploma), 5 credits / 7,5 HE creditsStudent thesis
    Abstract [en]

    This degree project is a literature study with focus on how the new national elevation model (NNH) has been used and how user friendly it is. The goal was to find out who uses NNH and what faults and errors might exist.

    Information about the NNH-project was composed to get a greater understanding of the project and to be able to understand the user-comments better. Multiple rapports, thesis and projects were read to gather the most common comments about the use of NNH.

    The collective impression showed that the users were pleased with NNH though there is need of improvement. NNH is used on many different levels like municipality, county, government and in educational institutes and business enterprises. One way to use NNH is to use it as basic data when making flood analysis, geological models, stocktaking stand of trees and for creating 3D-models to be used in community planning or presentations.

    The faults and errors that were reported included the large files the data are delivered in which are very demanding to process. The delivered data is good enough to make synoptic analyses but a higher resolution is required to make more in-depth analyses. There have also been propositions presented about scanning lakes, rivers and coastlines with green laser to get readings from the sea floor.

    The future for NNH looks bright and more and more types of businesses discovers the possibilities of elevation models and laser data and what it can do for their companies. 3D-modelling and presentations with photographs draped over an elevation model to make it look more attractive and easily understandable. Or as examples of project plans and construction projects.

  • 8.
    Friman, Margareta
    et al.
    Karlstad University, Faculty of Economic Sciences, Communication and IT.
    Fujii, Satoshi
    Ettema, Dick
    Gärling, Tommy
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Service Research Center. Karlstad University, Faculty of Economic Sciences, Communication and IT, The Service and Market Oriented Transport Research Group.
    Olsson, Lars E
    Karlstad University, Faculty of Economic Sciences, Communication and IT, The Service and Market Oriented Transport Research Group. Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Psychology.
    Tillfredsställelse med vardagliga resor oavsett färdmedel - psykometrisk analys av STS Skalan2012Conference paper (Refereed)
  • 9. Juliusson, Sara
    GIS-metod för planering av säkra skolvägar2012Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
  • 10. Larsson, Andreas
    et al.
    Söder, Patrik
    Jämförelse av olika GNSS-mottagare: Mätnoggrannhet i plan och höjd vid användande av nätverks-RTK2017Independent thesis Basic level (university diploma), 5 credits / 7,5 HE creditsStudent thesis
    Abstract [en]

    The objective of this paper was to test and compare three different GNSS-receivers’ accuracy, using NRTK. The instrument brands and models in the test were SatLab 300, Leica Viva GS15 and Trimble R10.

    The test was divided into two measurement series. Measurement series 1 was carried out in different areas with distances of 3-4 km (Skåre/Råtorp), 6-7 km (Våxnäs/Kronoparken), and 17-20 km (Vålberg/Älvenäs), respectively, from the closest physical SWEPOS-station (Class A). A total of nine control points in Karlstad municipality were used in measurement series 1, some with a total free line of sight southwards, and others partly obscured by buildings or trees.

     The results of measurement series 1 shows no significant differences between the tested GNSS- receiver’s results regarding to different distances to the SWEPOS-station (Class A). Measurement series 2 focused on measurements was carried out in a more accurate way, at a smaller number of control points located in the Våxnäs and Kronoparken areas.

    The control points were measured during a period of 10 to 20 minutes at each control point. In measurement series 1 the SatLab 300 and the Leica Viva GS15 with known coordinates at the chosen control points was compared. In measurement series 2 the SatLab 300, the Leica Viva GS15 and the Trimble R10 with known coordinates at the chosen control points were compared. In measurement series 1 fast measurement (1 époque), and an average of 25 époques were measured at every control point, with two return visits, both at different dates. In measurement series 2, fast measurement (1 époque), and an average of 100 époques were measured at every control point, with two return visits at the same date.

    The overall results show no significant differences in accuracy of measurements using the different receiver’s in NRTK-mode. The Trimble R10 results, however shows slightly more accurate results when comparing radial deviation, and slightly better values when comparing RMS, relative to the other GNSS receivers. At control points with an obscured sight of view, the Leica Viva GS15 has difficulties obtaining a fixed solution, and flickers between a fixed and a float state. At those conditions, the SatLab 300 has no problem with obtaining a fixed solution, whereas the Trimble R10 instead works in a different way, continuously presenting the quality of the positioning.

  • 11. Persson, Filip
    et al.
    Abbas, Zaid
    Jämförelse av stomnät: Enkel metod och nätutjämningsmetod2018Independent thesis Basic level (university diploma), 5 credits / 7,5 HE creditsStudent thesis
  • 12.
    Ryrberg, David
    Karlstad University, Faculty of Arts and Social Sciences (starting 2013).
    Kartans roll i skolan och vardagslivet: En beskrivande studie av lärares och elevers uppfattning av kartan som undervisningsmedel på utvalda högstadieskolor2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This study examines how teachers use the map as an educational aid in school and how students perceive the use of maps, both in school and their every-day life. How do the teachers perceive that the use of maps have changed with the update of the curriculum, from Lpo 94 to Lgr 11 is also going to be elucidated. To answer these questions, eight interviews with junior high school teachers and four focus groups consisting of four students each were done. During the interviews, the teachers stated that students today have a flawed/inadequate/deficient comprehensive view of the map, where focus often lies on a small area. The teachers regard this development of students’ perception of the map as a product of today’s technology, for example GPS where focus lies on finding the starting and ending points. Both paper and digital maps are essential when creating a structured view of the world where focus is both on the small and the big, according to the teachers. Five of the interviewed teachers stated that they need more knowledge about the technology to be able to use digital maps more. In the focus groups, most of the students primarily stated that they did not meet the map at all in their every-day life, but after discussion it was made clear that they meet some kind of map every day, for example in computer/video games, checking in somewhere on Facebook or finding an address with the help of Google Maps. Among the 16 students that participated in the focus groups, 12 stated that both the paper map and the digital map were needed in the education. They think that the digital map, especially Google Earth, is a funnier tool and make the lessons more interesting, but they stated that a paper map provides a better comprehensive picture of the designated area. 

  • 13.
    Stensson, Lily
    Karlstad University, Faculty of Social and Life Sciences.
    Spatial Accuracy in Orthophoto produced using UAV Photographic Images2016Independent thesis Basic level (university diploma), 5 credits / 7,5 HE creditsStudent thesis
    Abstract [en]

    The popularity of using UAV in image-taking for the production of 3D models and orthophotos has increased over time. Karlskoga Municipality has recently acquired an UAV to produce their own 3D models and orthophotos. This project paper aims to study the geospatial accuracy of the orthophotos and DEM files produced using the images taken with their UAV. The flight takes only a few minutes but a considerable time is spent in the production processes. Difficulty is experienced in determining the right center point for most GCPs. Produced orthophotos in the software Photoscan have a resolution from 1.7 to 2.4 centimeters while DEM files have a resolution from 3.4 to 4.8 centimeters. Four orthophotos and four DEM files are produced where GCPs are used and not used and at two different flight heights, 76 and 105 meters. The spatial data of the ten GCPs are identified on the orthophotos and DEM files in ArcMap and compared with GNSS NRTK measurements and Lantmäteriet's data. A visual control in terms of completeness of data, alignment, residual tilt and scale is also done. Standard deviations in plane for orthophotos there GCPs are not used are greater than 2 meters, while there GCPs are used are around 0.7 meters. Standard deviations for DEM files are observed at 0.8 meters.

1 - 13 of 13
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf