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Your search keyword '"UT-I-ITC-4DEarth"' showing total 32 results
Start Over Author "UT-I-ITC-4DEarth" Publisher international institute for geo-information science and earth observation
32 results on '"UT-I-ITC-4DEarth"'

3. Bridging risk management deficits in India using a geo-ICT based tool

Author

Bandyopadhyay, Debanjan, Sengupta, Anandita, van Westen, C.J., van der Veen, A., Department of Urban and Regional Planning and Geo-Information Management, UT-I-ITC-PLUS, Faculty of Geo-Information Science and Earth Observation, Department of Earth Systems Analysis, and UT-I-ITC-4DEarth

Published
2011

4. Principles of geographic information systems : an introductory textbook : translated into Mongolian

Author

de By, R.A., Georgiadou, P.Y., Knippers, R.A., Kraak, M.J., Sun, Y., Weir, M.J.C., van Westen, C.J., Department of Geo-information Processing, UT-I-ITC-STAMP, Faculty of Geo-Information Science and Earth Observation, Department of Urban and Regional Planning and Geo-Information Management, UT-I-ITC-PLUS, Department of Natural Resources, UT-I-ITC-FORAGES, Department of Earth Systems Analysis, and UT-I-ITC-4DEarth

Published
2011

8. Optimized image segmentation and its effect on classification accuracy

Author

Gao, Y., Norman Kerle, Mas, J. F., Navarrete, A., Niemeyer, I., Department of Earth Systems Analysis, UT-I-ITC-4DEarth, and Faculty of Geo-Information Science and Earth Observation

Subjects
ADLIB-ART-1430, ESA
Abstract

Image segmentation is a preliminary and critical step in segment-based image analysis. Its proper evaluation ensures that the best segmentation result is used in image classification. In this paper, image segmentations were carried out and the results were evaluated with an objective function that aims at maximizing homogeneity within segments and separability between neighbouring segments. The segmented images were classified with Maximum Likelihood Classifier (MLC) and the classification results were evaluated with independent ground data. The optimal segmentation, i.e. with the highest objective function value, also resulted in the highest classification accuracy, which is 5.92% higher than that obtained by the segmentation with the lower objective function value, and the difference is significant by McNemar’s test with p= 0.05, p is the significance level. This shows that the objective function is indeed an effective way to determine the optimal segmentations to carry out the classifications. Pixel-based MLC was also carried out to compare with the segment-based classification. Besides free of salt-and-pepper effect, the best-segmentationbased classification obtained accuracy 2.3% higher than obtained by the pixel-based classification. Though by McNemar’s test, the difference is not significance, with p=0.05. This result seems to suggest that the benefit of segmentation-based classification lies not only in the segmentation step, which alone leads to marginal classification improvement, but that the use of segments’ shape, contextual as well as spectral information, is needed to increase accuracy significantly.

Published
2007

9. Simulating floods: on the application of a 2D hydraulic model for flood hazard and risk assessment

Author

Alkema, D., Faculty of Geo-Information Science and Earth Observation, Department of Earth Systems Analysis, UT-I-ITC-4DEarth, and University Utrecht

Subjects
flood risk assessment, Adige River, flood hazard assessment, flood simulation, 2D hydraulic modeling, ESA, Delft-FLS, Geo-Hazards, Earth Sciences, Spatial Multi-Criteria Evaluation, ADLIB-BOOK-584, Oder River, Land van Maas en Waal
Abstract

Over the last decades, river floods in Europe seem to occur more frequently and are causing more and more economic and emotional damage. Understanding the processes causing flooding and the development of simulation models to evaluate countermeasures to control that damage are important issues. This study deals with the application of a 2D hydraulic flood propagation model for flood hazard and risk assessment. It focuses on two components: 1) how well does it predict the spatial-dynamic characteristics of floods and 2) how can the model results be transformed into a flood risk assessment. Flood risk results from the interaction of flood water with human activities. This makes flood risk assessment a multi-disciplinary endeavour: on one hand it requires good understanding of fluvial processes and flood behaviour; on the other hand a methodology is needed to quantify its impact on the socio-economic environment. In this study it is argued that in low-land areas with near-flat terrain and complex topography, traditional definitions of flood hazard and risk, based on magnitude-frequency relations, are not useful and that additional information is needed to differentiate the hazard using multiple parameters, for instance flood propagation, maximum water depths and flow velocities, duration, etc. Two-dimensional flood models are the appropriate tools for simulating flow of water to assess the consequences of terrain modifications on the flood characteristics. This is useful when flood consideration need to be included in the decision-making process and Environmental Impact Assessment studies. This study presents three case-studies. The inundation of the Ziltendorfer Niederung (Germany) during the 1997 Oder floods is used to test the 2D hydraulic model Delft-FLS. It is shown that the model yielded good results in reconstructing this flood event and that differences between predicted and observed water depths can largely be attributed to errors in the input data. In the second case-study, the model is applied to the Adige floodplain near Trento (Italy) to assess the flood consequences of a planned new embanked motorway. It is concluded that such developments in flood-prone areas can have a significant effect on the flood characteristics and will result in a redistribution of the flood risk in the area. The third case-study, the "Land van Maas en Waal" in the Netherlands, studies the effect of sub-compartments in a polder. It is concluded that compartmentalizing structures have a significant effect on the propagation of the flood through the area, the speed of water level rising and on the duration of the inundation. It is demonstrated that Spatial Multi-Criteria Evaluation (SMCE) can be used for multi-parameter flood-risk assessment to generate flood-risk maps that can be used in the decision making process. It is concluded that Delft-FLS is a powerful tool to simulate flood behaviour over complex topography and that "what-if" scenarios can help to assess the consequences of decisions and actions regarding flood characteristics. It is also concluded that for the incorporation of flood considerations in the decision-making process, the model results need to be transformed to risk. For this, SMCE could be a helpful tool.

Published
2007

10. Hydrothermal processes in the archean : new insights from imaging spectroscopy

Author

Ruitenbeek, F.J.A. van, van der Meer, Freek, Hale, M., Faculty of Geo-Information Science and Earth Observation, Department of Earth Systems Analysis, UT-I-ITC-4DEarth, and University Utrecht

Subjects
Archean, hydrothermal, greenstone belt, imaging spectroscopy, ESA, white mica, remote sensing, hyperspectral, reflectance spectroscopy, Earth Sciences, VMS, ADLIB-BOOK-585, mineral mapping
Abstract

The aim of this research was to gain new insights in fossil hydrothermal systems using airborne imaging spectroscopy. Fossil submarine hydrothermal systems in Archean greenstone belts and other geologic terranes are important because of their relationship with volcanic massive sulfide (VMS) mineral deposits and their association with environments that are favorable for early forms of life. Interpretation and reconstruction of these systems is difficult because of their geologic complexity. Airborne imaging spectroscopy provides information about the presence, abundance, and composition of near-infrared active minerals at continues spatial coverage and high spatial resolution, and could therefore be used to obtain new geologic information of the hydrothermal systems. It was applied to the Panorama VMS-district in the Soanesville greenstone belt, Western Australia. Results from the analyses of 189 hand specimen showed that the wavelength position of the main absorption feature of white micas, a proxy for their Al content, varied between 2195 nm and 2225 nm. These wavelength variations and the relative abundance of white micas were used to reconstruct fossil fluid pathways from low-temperature recharge to high-temperature discharge zones. Results also showed that the absorption-wavelength variations of white micas could be mapped from airborne imaging spectroscopy using a stochastic method where the presence of white mica minerals and their absorption wavelengths in field measurements were predicted from band ratios. Analysis of the spatial patterns in segmented images, covering 52 km2, of white mica probability and their absorption wavelengths and their comparison with field data resulted in the identification of a regional-scale K alteration event, previously unmapped fluid pathways, and differences in hydrothermal regime between the northern and southern parts of the test area. A new methodology for the study of hydrothermal processes in the rock record using airborne imaging spectroscopy was synthesized. This methodology involves three steps: (1) creation of maps of surface mineralogy from airborne data, (2) determination of the geologic significance of the near-infrared detectable mineralogy, and (3) evaluation of spectral patterns present in the airborne imagery. The research showed that airborne imaging spectroscopy is a research tool that can be used for discovering new information about fossil hydrothermal processes.

Published
2007

11. Research vision : ITC research and graduate programme, geo - information science and earth observation

Author

Kraak, M.J., Jetten, V.G., Paresi, C.M.J., Skidmore, A.K., Su, Zhongbo, Vosselman, G., Department of Geo-information Processing, UT-I-ITC-STAMP, Faculty of Geo-Information Science and Earth Observation, Department of Earth Systems Analysis, UT-I-ITC-4DEarth, Department of Natural Resources, UT-I-ITC-FORAGES, Department of Water Resources, UT-I-ITC-WCC, Department of Earth Observation Science, and UT-I-ITC-ACQUAL

Subjects
ADLIB-BOOK-547, GIP, NRS, EOS, PGM, WRS, ESA
Published
2006

16. Sensors and platforms

Author

Janssen, L.L.F., Bakker, W.H., Faculty of Geo-Information Science and Earth Observation, Department of Earth Systems Analysis, and UT-I-ITC-4DEarth

Subjects
ADLIB-ART-4291, ESA
Published
2004

17. Multispectral scanners

Author

Bakker, W.H., Faculty of Geo-Information Science and Earth Observation, Department of Earth Systems Analysis, and UT-I-ITC-4DEarth

Subjects
ADLIB-ART-4293, ESA
Published
2004

18. Imaging spectrometry

Author

van der Meer, F.D., van Ruitenbeek, F.J.A., Bakker, W.H., Kerle, N., Department of Earth Systems Analysis, Faculty of Geo-Information Science and Earth Observation, and UT-I-ITC-4DEarth

Subjects
ADLIB-ART-4299, ESA
Published
2004

19. Principles of geographic information systems : an introductory textbook : translated into Korean

Author

de By, R.A., Knippers, R., Sun, Yuxian, Ellis, M.C., Kraak, M.J., Weir, M.J.C., Georgiadou, P.Y., Radwan, M.M., van Westen, C.J., Kainz, W., Sides, E.J., Department of Geo-information Processing, UT-I-ITC-STAMP, Faculty of Geo-Information Science and Earth Observation, Department of Natural Resources, UT-I-ITC-FORAGES, Department of Urban and Regional Planning and Geo-Information Management, UT-I-ITC-PLUS, Department of Earth Systems Analysis, and UT-I-ITC-4DEarth

Subjects
GIP, NRS, PGM, ESA, ADLIB-BOOK-457
Published
2004

20. Thermal remote sensing

Author

Hecker, C.A., Gieske, A.S.M., Department of Water Resources, Department of Earth Systems Analysis, UT-I-ITC-4DEarth, and Faculty of Geo-Information Science and Earth Observation

Subjects
ADLIB-ART-4298, WRS, ESA
Published
2004

21. Principles of geographic information systems : an introductory textbook

Author

de By, R.A., Georgiadou, P.Y., Knippers, R., Kraak, M.J., Sun, Yuxian, Weir, M.J.C., van Westen, C.J., Department of Geo-information Processing, UT-I-ITC-STAMP, Faculty of Geo-Information Science and Earth Observation, Department of Urban and Regional Planning and Geo-Information Management, UT-I-ITC-PLUS, Department of Natural Resources, UT-I-ITC-FORAGES, Department of Earth Systems Analysis, and UT-I-ITC-4DEarth

Subjects
GIP, NRS, EOS, ADLIB-BOOK-461, PGM, ESA
Published
2004

22. Principles of geographic information systems : an introductory textbook

Author

de By, R.A., Knippers, R., Sun, Yuxian, Ellis, M.C., Kraak, M.J., Weir, M.J.C., Georgiadou, P.Y., Radwan, M.M., van Westen, C.J., Kainz, W., Sides, E.J., Department of Geo-information Processing, UT-I-ITC-STAMP, Faculty of Geo-Information Science and Earth Observation, Department of Natural Resources, UT-I-ITC-FORAGES, Department of Urban and Regional Planning and Geo-Information Management, UT-I-ITC-PLUS, Department of Earth Systems Analysis, and UT-I-ITC-4DEarth

Subjects
GIP, NRS, EOS, ADLIB-BOOK-360, PGM, ADLIB-BOOK-311, ESA
Published
2001

28. Principles of geographic information systems : ITC core module : version 1 : syllabus

Author

de By, R.A., Ellis, M.C., Kainz, W., Knippers, R., Kraak, M.J., Krol, B.G.C.M., Radwan, M.M., Sides, E.J., Sun, Yuxian, Weir, M.J.C., van Westen, C.J., Department of Geo-information Processing, UT-I-ITC-STAMP, Faculty of Geo-Information Science and Earth Observation, Department of Earth Systems Analysis, UT-I-ITC-4DEarth, Department of Natural Resources, and UT-I-ITC-FORAGES

Subjects
GIP, NRS, EOS, ADLIB-BOOK-263, PGM
Published
1999

29. Principles of remote sensing : ITC core module : version 1 : syllabus

Author

Bakker, W.H., Gorte, B.G.H., Horn, J.A., Hussin, Y.A., Huurneman, G.C., Janssen, L.L.F., Reeves, C.V., Shrestha, D.P., Skidmore, A.K., Soeters, R., Weir, M.J.C., Wodai, T., Department of Earth Observation Science, Department of Geo-information Processing, Department of Earth Systems Analysis, Faculty of Geo-Information Science and Earth Observation, UT-I-ITC-4DEarth, Department of Natural Resources, and UT-I-ITC-FORAGES

Subjects
GIP, NRS, EOS, ADLIB-BOOK-267, ESA
Published
1999

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