Digital Terrain Analysis in ILWIS Lecture notes and user guide

All rights reserved. No part of this book may be published, reproduced, or stored in a database or retrieval system, in any form or in any way, either mechanically, electronically, by print, photocopy or any other means, without the prior written permission of the authors. Foreword This lecture notes are intended for all ITC students, primarily participants of the Natural Resources (NRM), Water Resources (WREM) and Earth Resources (EREG) programmes. Other people interested in the application of digital terrain analysis and all current and potential users of Integrated Land and Water Information System (ILWIS) package [71] are also welcome. After completion of the course students are able to employ and critically reflect existing terrain analysis tools and to implement own algorithms in ILWIS or similar software. A reader should be familiar with the basic GIS raster techniques and has a background in physical geography or similar earth sciences dealing with terrain. Students should also be familiar with these terms and concepts: raster/vetcor GIS, pixel size/scale, GIS operations and ILWIS scripts. The following chapters/books are suggested for beginners: The materials consist of two parts: theoretical introduction and user guide developed using a small case study. You can download the datasets and scripts and see dynamic visaulisations of the error propagation at iii Note that some scripts are not full operational and some contain unresolved bugs within ILWIS. If you discover such problems, feel free to contact authors or report a bug directly to ILWIS development team. We would like to thank the ILWIS team for their support, namely J.H.M. Hendrikse for suggestions about the scripts and C. Hecker, software tester for reporting and processing bugs we discovered during the development of applications. Principles developed in this lecture note will serve as a basis for the development of a special module for terrain analysis within ILWIS. We would also like to thank Dr. K. Tempfli (EOS department, ITC), who has been teaching interpolation techniques and technical and technological issues related to the production and use of DEM. He produced two lecture notes used internally at ITC: " Topography and Orthophotography " and " Interpolation and filtering " , which we referred to many times. international institute for geo-information science and earth observation enschede, the netherlands

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