Getting to grips with GIS
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Getting to grips with GIS : The technology Dr. Ian Gregory, Department of Geography, University of Portsmouth PowerPoint PPT Presentation


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Getting to grips with GIS : The technology Dr. Ian Gregory, Department of Geography, University of Portsmouth. Structure of talk. 1. The types of software in GIS i. Desktop GIS ii. Attribute database management systems iii. Spatially-enabled database management systems iv. Internet GIS

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Getting to grips with GIS : The technology Dr. Ian Gregory, Department of Geography, University of Portsmouth

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Structure of talk

Getting to grips with GIS:

The technology

Dr. Ian Gregory,

Department of Geography,

University of Portsmouth


Structure of talk

Structure of talk

  • 1. The types of software in GIS

    • i. Desktop GIS

    • ii. Attribute database management systems

    • iii. Spatially-enabled database management systems

    • iv. Internet GIS

  • 2. Examples of GIS software

    • ArcView

    • TimeMap


  • Desktop gis software

    Desktop GIS software

    • The beginning:

      • ArcInfo

        • Launched in 1980 by ESRI

        • Build Arc (GIS functionality) over Info (a RDBMS)

        • Mainframe-based

        • Command line driven

        • Documentat ion 3 feet thick

        • Set the standards until the mid-1990s


    Desktop gis software 2

    Desktop GIS software (2)

    • The mid-1990s:

      • MapInfo:

        • MapInfo Corporation

        • Windows-based

        • Point and click user interface

        • Intuitive

        • Moved GIS software into the mainstream

      • ArcView:

        • ESRI’s response

        • Originally just a viewer for ArcInfo

        • Became (at 3.0) a fully-fledged PC-based GIS software package

      • ArcInfo:

        • pcArcInfo – Cut down version of ArcInfo available from the early 1990s

        • Full ArcInfo – Available under Windows NT by the late 1990s

        • Retained more functionality than ArcView


    Desktop gis software 3

    Desktop GIS software (3)

    • Now:

      • MapInfo still a strong product

      • ESRI has moved to combine ArcInfo and ArcView into ArcGIS (including ArcInfo 8.0)

      • TimeMap:

        • Written by archaeologists at the University of Sydney

        • Specifically aimed at arts and humanities applications

        • Temporal functionality but not full GIS

        • Linked to the ECAI metadata clearinghouse

        • All the strengths and limitations of free software

      • Object-orientated GIS

        • E.g. Smallworld

        • Use an O-O data model rather than a hybrid GIS data model

        • Not widely accepted


    Desktop gis software 4

    Desktop GIS software (4)

    • Costs (academic site licenses through CHEST):

      • ArcGIS : £3,400

      • ArcView: £1,250

      • MapInfo: prices vary from £1,000- £2,500

      • TimeMap: free (see http://www.timemap.net)


    Attribute database management systems

    Attribute database management systems

    • Using a GIS does not require transferring all attribute data into a GIS

    • Attribute data linked to spatial data through a relational join

    • Can be accessed through either the GIS software or the host database management system

    • Examples:

      • MapInfo: Dbase, Access, Excel, Lotus 123, Oracle

      • ArcView: Dbase, Access, Excel, Visual FoxPro

      • ArcInfo: Oracle, Ingres, Dbase


    Spatially enabled database management systems

    Spatially-enabled database management systems

    • Spatial extensions to existing DBMSs

    • Capable of handling spatial data

      • Eg. point-in-polygon operations

    • Do not provide full GIS capability

      • Eg. Vector overlay

      • Limited mapping capability

    • Examples:

      • Oracle Spatial

      • ArcSDE (ESRI)


    Internet gis

    Internet GIS

    • Allows vector GIS data to be disseminated on the web

    • Clients can:

      • turn layers off and on

      • perform spatial and attribute queries

      • pan, zoom, etc.

    • Eg. ArcIMS


    The arcview interface

    The ArcView interface

    The interface is made up of a number of different parts.

    Menu barButton barTool bar

    Project window

    The application window has one project window – it displays the names of all the documents contained in an ArcView project.

    Document windows

    For each type of information you work with, there is a document window and interface.

    Status bar

    Descriptions of menu choices, tools and buttons appear on the Status bar. Also reports measurements and displays a progress bar for lengthy operations.

    © ECAI, 2002


    Arcview documents

    ArcView documents

    Documents are components of a project. Each type has its own window and user interface.

    View – display, query & analyze themes

    Table – display attribute data

    Layout – integrate documents to create presentation-quality maps

    Chart – represents tabular data graphically

    Script – program written in Avenue used to customize the interface, automate common functions or create applications

    © ECAI, 2002


    Arcview projects

    A project is a file for organizing your work. It contains a collection of documents (views, tables, charts, layouts and scripts) that are used to organize information.

    ArcView projects

    • Projects organize documents.

    • All project work is stored in a single file (.apr) that references your data.

    When you save a project (.apr), it stores the status of the documents it contains, including how and where they are displayed, the current selection sets and the appearance of the application window. You are saving a “snapshot” of the state of ArcView at the time of the save.

    Views

    Project window

    Displays the names of all project documents & acts as a gateway to all documents in the project. In an ArcView session, only one active project at a time.

    Tables

    Charts

    Layouts

    Scripts

    © ECAI, 2002


    Views and themes

    Different themes can reference the same data source.

    Views and Themes

    • A theme is a specific way of displaying a data source.

    • Themes are displayed in views

    • Each theme has a title and a legend in the view’s Table of Contents

    Themes

    The view window has 2 parts – the Table of Contents and the Map Display area.

    Table of Contents

    Map Display

    © ECAI, 2002


    Common theme operations

    Common Theme Operations

    When a theme is turned on, ArcView draws it in the map display area. Turning off a theme doesn’t delete it! And a theme doesn’t have to be turned on to perform operations on it.

    • Control visibility

    • Specify active themes (raised)

    • Change display order (by dragging)

    Many operations only work if theme is active. To make more than one theme active, hold down the Shift key as you click on each theme you want to make active. By making a theme active you are telling ArcView that you want to work with the features in that theme.

    Table of contents draw order is bottom to top – the last theme in the TOC will draw on the bottom (or first in the draw order).

    © ECAI, 2002


    Symbol window

    Fill Palette

    Pen Palette

    Symbol Window

    To invoke the Symbol window double click on the symbol patch in the Legend Editor or use the shortcut of CTRL-P when you don’t have the Legend Editor open.

    A palette is a collection of symbols and colors – all the palettes in ArcView are collectively referred to as the Symbol window.

    Marker Palette

    Font Palette

    Color Palette

    Palette Manager

    Use the Palette Manager to load, save, clear, create a default palette or reload the system palette. You can also import an icon file – bitmap format.

    © ECAI, 2002


    Using arcview s help system

    Using ArcView’s Help system

    • Online help

    • Help for buttons, tools, menus

    Help button

    • Help for dialog boxes: F1 key

    • Help Topics: Contents, Index, Find

    © ECAI, 2002


    Timemap

    TimeMap

    • The primary purpose of TimeMap is to act as a viewer of GIS data as well as many other types of information.

    • TimeMap does not have all of the features of a typical geographic information system such as:

      • Data creating

      • Data editing

      • Data analysis

      • Advanced map display

    • TimeMap does:

      • Allow easy visualisation and exploration of datasets

      • Allow integration of disparate datasets using the ECAI metadata clearinghouse

      • Provide effective temporal functionality

    © ECAI, 2002


    The sasanian empire website

    The Sasanian Empire Website

    • http://ecai.org/sasanianweb

    • Provides a text based browser interface for the publication.

    • Provides access to:

      • Document "Sasanian Seals from the Collection of the Late Edward Gans, at the University of California, Berkeley" by Guitty Azarpay, Et al

    © ECAI, 2002


    Sasanian publication in time map

    Sasanian Publication in TimeMap

    • Provides an example of the capabilities of the ECAI system to include

      • GIS data

      • Historic maps

      • Images

      • Texts in a time and place context

    © ECAI, 2002


    Sasanian publication in time map1

    Sasanian Publication in TimeMap

    • Zoom in to see more information.

    © ECAI, 2002


    Sasanian publication in time map2

    Sasanian Publication in TimeMap

    • A gazetteer of Sasanian Empire places and their attributes is included with information derived from the Sasanian Empire Map published by Tubinger in Germany.

    © ECAI, 2002


    Sasanian publication in time map3

    Sasanian Publication in TimeMap

    • Five key sites in the Sasanian Empire are presented in a map layer that links to images and descriptions of the sites.

    © ECAI, 2002


    Sasanian publication in time map4

    Sasanian Publication in TimeMap

    • View border for different time ranges

    © ECAI, 2002


    Sasanian publication in time map5

    Sasanian Publication in TimeMap

    • Control which layers display based on time.

    © ECAI, 2002


    Conclusions

    Conclusions

    • In practice their are only a limited number of GIS software packages available

      • ArcView/ArcGIS (http://www.esri.com)

      • MapInfo (http://www.mapinfo.com/)

      • TimeMap (http://www.timemap.net, see also http://ecai.org)

  • The learning curve is steep but not unmanageable

  • Hardware and software costs are significant

  • Do not be constrained by the tools offered by the software


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