Manual Spatial Databases: With Application to GIS (The Morgan Kaufmann Series in Data Management Systems)

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Covers spatial access methods, including the R-tree and several space-driven structures, and is filled with dozens of helpful illustrations. In time, those Unconscionable Maps did not satisfy and the Colleges of Cartographers set up a Map of the Empire which had the size of the Empire itself and coincided with it point by point. Jochen L. His recent work has focused on spatial databases and digital libraries. Her research interests include data models for geographic and environmental information systems, interoperability in information systems, and navigation systems.

It is an excellent introduction for computer science professionals interested in exploring GIS, and an excellent resource for GIS professionals interested in learning more about the computer science foundations of the field.

Spatial Databases: With Application to GIS (The Morgan Kaufmann Series in Data Management Systems)

Goodchild, National Center for Geographic Information and Analysis, and University of California, Santa Barbara "Spatial Databases is a well-written, comprehensive treatment of a multi-disciplinary field, spanning computational geometry, database modeling, object-orientation, and query processing. The Rectangle Intersection Example.

Exploring GIS: Spatial data sources

Representation of Spatial Objects. Logical Models and Query Languages. Topological Predicates. The Constraint Data Model. FirstOrder Queries. Algebraic Queries. If you have data that you want to analyze and understand, this book and the associated Weka toolkit are an excellent way to start. Contents Foreword Preface v xxiii xxvii Updated and revised content Acknowledgments xxix Part I Machine learning tools and techniques 1 1 1. Yet most of the information is in its raw form: data. If data is characterized as recorded facts, then information is the set of patterns, or expectations, that underlie the data.

There is a huge amount of information locked up in databases--information that is potentially important but has not yet been discovered or articulated. Our mission is to bring it forth. Data mining is the extraction of implicit, previously unknown, and potentially useful information from data.

The idea is to build computer programs that sift through databases automatically, seeking regularities or patterns. Strong patterns, if found, will likely generalize to make accurate predictions on future data.

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Of course, there will be problems. Many patterns will be banal and uninteresting. Others will be spurious, contingent on accidental coincidences in the particular dataset used. In addition real data is imperfect: Some parts will be garbled, and some will be missing. Anything discovered will be inexact: There will be exceptions to every rule and cases not covered by any rule. Algorithms need to be robust enough to cope with imperfect data and to extract regularities that are inexact but useful. Machine learning provides the technical basis of data mining.

Teaching Methods

It is used to extract information from the raw data in databases--information that is expressed in a comprehensible form and can be used for a variety of purposes. The process is one of abstraction: taking the data, warts and all, and inferring whatever structure underlies it. This book is about the tools and techniques of machine learning used in practical data mining for finding, and describing, structural patterns in data. As with any burgeoning new technology that enjoys intense commercial attention, the use of data mining is surrounded by a great deal of hype in the technical--and sometimes the popular--press.

Exaggerated reports appear of the secrets that can be uncovered by setting learning algorithms loose on oceans of data. Instead, there is an identifiable body of simple and practical techniques that can often extract useful information from raw data. This book describes these techniques and shows how they work. We interpret machine learning as the acquisition of structural descriptions from examples.

The kind of descriptions found can be used for prediction, explanation, and understanding. Some data mining applications focus on prediction: forecasting what will happen in new situations from data that describe what happened in the past, often by guessing the classification of new examples. But we are equally--perhaps more--interested in applications in which the result of "learning" is an actual description of a structure that can be used to classify examples. This structural description supports explanation, understanding, and prediction.

In our experience, insights gained by the applications' users are of most interest in the majority of practical data mining applications; indeed, this is one of machine learning's major advantages over classical statistical modeling. The book explains a variety of machine learning methods. Some are pedagogically motivated: simple schemes designed to explain clearly how the basic ideas work.

Others are practical: real systems used in applications today. Many are contemporary and have been developed only in the last few years. A comprehensive software resource, written in the Java language, has been created to illustrate the ideas in the book. It is a full, industrialstrength implementation of essentially all the techniques covered in this book. It includes illustrative code and working implementations of machine learning methods.

It offers clean, spare implementations of the simplest techniques, designed to aid understanding of the mechanisms involved. It also provides a workbench that includes full, working, state-of-the-art implementations of many popular learning schemes that can be used for practical data mining or for research. Finally, it contains a framework, in the form of a Java class library, that supports applications that use embedded machine learning and even the implementation of new learning schemes. The objective of this book is to introduce the tools and techniques for machine learning that are used in data mining.

After reading it, you will understand what these techniques are and appreciate their strengths and applicability. If you wish to experiment with your own data, you will be able to do this easily with the Weka software. Found only on the islands of New Zealand, the weka pronounced to rhyme with Mecca is a flightless bird with an inquisitive nature. A brief description of these books appears in the Further reading section at the end of Chapter 1. This gulf is rather wide.

To apply machine learning techniques productively, you need to understand something about how they work; this is not a technology that you can apply blindly and expect to get good results. Different problems yield to different techniques, but it is rarely obvious which techniques are suitable for a given situation: you need to know something about the range of possible solutions. We cover an extremely wide range of techniques. We can do this because, unlike many trade books, this volume does not promote any particular commercial software or approach.

We include a large number of examples, but they use illustrative datasets that are small enough to allow you to follow what is going on. Real datasets are far too large to show this and in any case are usually company confidential. Our datasets are chosen not to illustrate actual large-scale practical problems but to help you understand what the different techniques do, how they work, and what their range of application is.

Spatial Databases - 1st Edition

The book is aimed at the technically aware general reader interested in the principles and ideas underlying the current practice of data mining. It will also be of interest to information professionals who need to become acquainted with this new technology and to all those who wish to gain a detailed technical understanding of what machine learning involves.

It is written for an eclectic audience of information systems practitioners, programmers, consultants, developers, information technology managers, specification writers, patent examiners, and curious laypeople--as well as students and professors--who need an easy-to-read book with lots of illustrations that describes what the major machine learning techniques are, what they do, how they are used, and how they work. It is practically oriented, with a strong "how to" flavor, and includes algorithms, code, and implementations. All those involved in practical data mining will benefit directly from the techniques described.

The book is aimed at people who want to cut through to the reality that underlies the hype about machine learning and who seek a practical, nonacademic, unpretentious approach. We have avoided requiring any specific theoretical or mathematical knowledge except in some sections marked by a light gray bar in the margin. These contain optional material, often for the more technical or theoretically inclined reader, and may be skipped without loss of continuity.

The book is organized in layers that make the ideas accessible to readers who are interested in grasping the basics and to those who would like more depth of treatment, along with full details on the techniques covered. We believe that consumers of machine learning need to have some idea of how the algorithms they use work. However, it is not necessary for all data model users to have a deep understanding of the finer details of the algorithms.

We address this situation by describing machine learning methods at successive levels of detail. You will learn the basic ideas, the topmost level, by reading the first three chapters. Chapter 1 describes, through examples, what machine learning is and where it can be used; it also provides actual practical applications.

Chapters 2 and 3 cover the kinds of input and output--or knowledge representation--involved. Different kinds of output dictate different styles of algorithm, and at the next level Chapter 4 describes the basic methods of machine learning, simplified to make them easy to comprehend. Here the principles involved are conveyed in a variety of algorithms without getting into intricate details or tricky implementation issues. To make progress in the application of machine learning techniques to particular data mining problems, it is essential to be able to measure how well you are doing.

Chapter 5, which can be read out of sequence, equips you to evaluate the results obtained from machine learning, addressing the sometimes complex issues involved in performance evaluation. At the lowest and most detailed level, Chapter 6 exposes in naked detail the nitty-gritty issues of implementing a spectrum of machine learning algorithms, including the complexities necessary for them to work well in practice.

Although many readers may want to ignore this detailed information, it is at this level that the full, working, tested implementations of machine learning schemes in Weka are written. Chapter 7 describes practical topics involved with engineering the input to machine learning--for example, selecting and discretizing attributes-- and covers several more advanced techniques for refining and combining the output from different learning techniques.

The final chapter of Part I looks to the future. The book describes most methods used in practical machine learning. However, it does not cover reinforcement learning, because it is rarely applied in practical data mining; genetic algorithm approaches, because these are just an optimization technique; or relational learning and inductive logic programming, because they are rarely used in mainstream data mining applications. The data mining system that illustrates the ideas in the book is described in Part II to clearly separate conceptual material from the practical aspects of how to use it.

You can skip to Part II directly from Chapter 4 if you are in a hurry to analyze your data and don't want to be bothered with the technical details. Java has been chosen for the implementations of machine learning techniques that accompany this book because, as an object-oriented programming language, it allows a uniform interface to learning schemes and methods for preand postprocessing. A Java program is compiled into byte-code that can be executed on any computer equipped with an appropriate interpreter.

This interpreter is called the Java virtual machine. Java virtual machines--and, for that matter, Java compilers--are freely available for all important platforms. Like all widely used programming languages, Java has received its share of criticism. Although this is not the place to elaborate on such issues, in several cases the critics are clearly right. However, of all currently available programming languages that are widely supported, standardized, and extensively documented, Java seems to be the best choice for the purpose of this book.

Its main disadvantage is speed of execution--or lack of it. Executing a Java program is several times slower than running a corresponding program written in C language because the virtual machine has to translate the byte-code into machine code before it can be executed. In our experience the difference is a factor of three to five if the virtual machine uses a just-in-time compiler. Instead of translating each byte-code individually, a just-in-time compiler translates whole chunks of byte-code into machine code, thereby achieving significant speedup. However, if this is still to slow for your application, there are compilers that translate Java programs directly into machine code, bypassing the byte-code step.

This code cannot be executed on other platforms, thereby sacrificing one of Java's most important advantages. Updated and revised content We finished writing the first edition of this book in and now, in April , are just polishing this second edition. The areas of data mining and machine learning have matured in the intervening years.

Books in the The Morgan Kaufmann Series in Data Management Systems series

Although the core of material in this edition remains the same, we have made the most of our opportunity to update it to reflect the changes that have taken place over 5 years. There have been errors to fix, errors that we had accumulated in our publicly available errata file.

Surprisingly few were found, and we hope there are even fewer in this second edition. We have thoroughly edited the material and brought it up to date, and we practically doubled the number of references. The most enjoyable part has been adding new material. Here are the highlights. Bowing to popular demand, we have added comprehensive information on neural networks: the perceptron and closely related Winnow algorithm in Section 4.

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We have included more recent material on implementing nonlinear decision boundaries using both the kernel perceptron and radial basis function networks. There is a new section on Bayesian networks, again in response to readers' requests, with a description of how to learn classifiers based on these networks and how to implement them efficiently using all-dimensions trees. The Weka machine learning workbench that accompanies the book, a widely used and popular feature of the first edition, has acquired a radical new look in the form of an interactive interface--or rather, three separate interactive interfaces--that make it far easier to use.

The primary one is the Explorer, which gives access to all of Weka's facilities using menu selection and form filling. The others are the Knowledge Flow interface, which allows you to design configurations for streamed data processing, and the Experimenter, with which you set up automated experiments that run selected machine learning algorithms with different parameter settings on a corpus of datasets, collect performance statistics, and perform significance tests on the results. These interfaces lower the bar for becoming a practicing data miner, and we include a full description of how to use them.

However, the book continues to stand alone, independent of Weka, and to underline this we have moved all material on the workbench into a separate Part II at the end of the book. In addition to becoming far easier to use, Weka has grown over the last 5 years and matured enormously in its data mining capabilities.

It now includes an unparalleled range of machine learning algorithms and related techniques.

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The growth has been partly stimulated by recent developments in the field and partly led by Weka users and driven by demand. This puts us in a position in which we know a great deal about what actual users of data mining want, and we have capitalized on this experience when deciding what to include in this new edition. The earlier chapters, containing more general and foundational material, have suffered relatively little change.

We have added more examples of fielded applications to Chapter 1, a new subsection on sparse data and a little on string attributes and date attributes to Chapter 2, and a description of interactive decision tree construction, a useful and revealing technique to help you grapple with your data using manually built decision trees, to Chapter 3. In addition to introducing linear decision boundaries for classification, the infrastructure for neural networks, Chapter 4 includes new material on multinomial Bayes models for document classification and on logistic regression.

The last 5 years have seen great interest in data mining for text, and this is reflected in our introduction to string attributes in Chapter 2, multinomial Bayes for document classification in Chapter 4, and text transformations in Chapter 7. Chapter 4 includes a great deal of new material on efficient data structures for searching the instance space: kD-trees and the recently invented ball trees.

Chapter 5 describes the principles of statistical evaluation of machine learning, which have not changed. The main addition, apart from a note on the Kappa statistic for measuring the success of a predictor, is a more detailed treatment of cost-sensitive learning. We describe how to use a classifier, built without taking costs into consideration, to make predictions that are sensitive to cost; alternatively, we explain how to take costs into account during the training process to build a cost-sensitive model. We also cover the popular new technique of cost curves.

There are several additions to Chapter 6, apart from the previously mentioned material on neural networks and Bayesian network classifiers. We describe how to use model trees to generate rules for numeric prediction. We show how to apply locally weighted regression to classification problems. Finally, we describe the X-means clustering algorithm, which is a big improvement on traditional k-means.

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Chapter 7 on engineering the input and output has changed most, because this is where recent developments in practical machine learning have been concentrated. We describe new attribute selection schemes such as race search and the use of support vector machines and new methods for combining models such as additive regression, additive logistic regression, logistic model trees, and option trees. We give a full account of LogitBoost which was mentioned in the first edition but not described.

There is a new section on useful transformations, including principal components analysis and transformations for text mining and time series. We also cover recent developments in using unlabeled data to improve classification, including the co-training and co-EM methods.

The final chapter of Part I on new directions and different perspectives has been reworked to keep up with the times and now includes contemporary challenges such as adversarial learning and ubiquitous data mining. Acknowledgments Writing the acknowledgments is always the nicest part!