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The environment is key to sustaining human economic activity and well-being, for without a healthy environment, human quality of life is reduced. Most people would agree that there are also many reasons to protect the environment for its own inherent worth, and especially to leave a legacy of fully functioning natural resources. Sustainable land management refers to the activities of humans and implies that activity will continue in perpetuity. It is a term that attempts to balance the often conflicting ideals of economic growth and maintaining environmental quality and viability | Environmental Modelling with GIS and Remote Sensing Edited by Andrew Skidmore Copyright 2002 Andrew Skidmore First published 2002 by Taylor Francis 11 New Fetter Lane London EC4P 4EE Simultaneously published in the USA and Canada by Routledge 29 West 35th Street New York NY 10001 Reprinted 2003 twice Taylor Francis is an imprint of the Taylor Francis Group 2002 Andrew Skidmore This book has been produced from camera ready copy supplied by the editor All rights reserved. No part of this book may be reprinted or reproduced or utilised in any form or by any electronic mechanical or other means now known or hereafter invented including photocopying and recording or in any information storage or retrieval system without permission in writing from the publishers. Every effort has been made to ensure that the advice and information in this book is true and accurate at the time of going to press. However neither the publisher nor the authors can accept any legal responsibility or liability for any errors or omissions that may be made. In the case of drug administration any medical procedure or the use of technical equipment mentioned within this book you are strongly advised to consult the manufacturer s guidelines. British Library Cataloguing in Publication Data A catalogue record for this book is available from the British Library Library of Congress Cataloguing in Publication Data A catalogue record has been requested ISBN 0 115-24170-7 Copyright 2002 Andrew Skidmore Contents Preface List of figures List of tables and boxes xi xiii xvii 1. Introduction 1 1.11 The challenge 1 1.2 Motivation to write this book 1.3 What is environmental modelling and how can GIS and 2 remote sensing help in environmental modelling 3 1.4 Contents of the book 6 1.5 References 7 2. Taxonomy of environmental models in the spatial sciences 8 2.1 Introduction 8 2.2 Taxonomy of models 9 2.3 Models of logic 10 2.3.1 Deductive models 10 2.3.2 Inductive models 11 2.3.3 Discussion 14 2.4 .