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How to Pick a GIS Getting Started With GIS Chapter 8
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8 How to Pick a GIS 8.1 The Evolution of GIS Software 8.2 GIS and Operating Systems 8.3 GIS Software Capabilities 8.4 GIS Software and Data Structures 8.5 Choosing the Best GIS
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Preconceptions again…. n How big a difference is there in functionality among the many various GIS software packages on the market? n A=No difference at all n E=No commonality at all
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In twenty years time (2028) a GIS will cost? n A. $10,000 n B. $1,000 n C. $100 n D. $10 n E. Nothing
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If I get hired as GIS analyst: n A. I would be completely uninvolved in choosing software, they already use ArcGIS n B. I could leave the ads on my boss’s desk n C. My advice may be sought on a choice of software n D. My advice would be sought and used in choosing software n E. I would have to make a choice of what to purchase on my first day, with zero guidance
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Choosing the GIS n GIS users need to be aware of different GIS software products during system selection and beyond n OpenGIS (OGC) standards have led to a new generation of choices for software n Informed choice is the best way to select the best GIS
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Functionality n What functions must GIS perform? n What functions can it perform? n What software has what functions? n First management step is often to make a requirements matrix: needs vs. capabilities
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A functional definition of GIS n A GIS is often defined not for what it is but for what it can do. n If the GIS does not match the requirements for a problem, no GIS solution will be forthcoming. n A GIS may have overcapacity.
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GIS as a toolbox… n How did functions develop over time? n What are the differences among software packages? n What are any given packages strengths and weaknesses? n What other factors come into play, cost, training, maintenance, robustness, etc.
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GIS software in 1979 n A historical GIS “snapshot” was the IGC survey conducted in 1979 n In the 1979 survey, most GISs were sets of loosely linked FORTRAN programs performing spatial operations n Computer mapping programs had evolved GIS functionality
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GIS in the 1980s n spreadsheet was ported to the microcomputer, allowing “active” data n relational DBMS evolved as the leading means for database management n single integrated user interface n degree of device independence n led to the first true GIS software
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GIS in the 90s n used graphical user interfaces and the desktop/WIMP model n Unix workstations integrated GIS with the X-windows GUI n GISs began to use the OS GUI instead of their own n PCs integrated GIS with the variants of Windows and other OSs
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X windows and the GUI
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GIS in the 2000s n Mobile systems n Web-based extensions n Distributed systems and data n Most software now object-oriented n New competition: OpenSource n Web services n Location-based services
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Trends still under way n Open Source development tools now ubiquitous, e.g. geotools libraries n GoogleEarth, Virtual Earth, etc. n Mash-up solutions
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The “critical six” functional capabilities n data capture n storage n management n retrieval n analysis n display
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Data capture functions n digitizing n scanning n mosaicing n editing n generalization n topological cleaning
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Steps in mosaicing
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Rubber sheeting
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Line generalization
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Storage functions n compression n metadata handling n control via macros or languages n format support
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Compression n By data structure u quad trees u run length encoding n By data format u compressed TIF u jpeg n By physical compression u digit handling
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Data management functions n physical model support n DBMS n address matching n masking n cookie cutting
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Cookie cutting
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Data retrieval functions n locating n selecting by attributes n buffering n map overlay n map algebra
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Map algebra
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Data analysis functions n interpolation n optimal path selection n geometric tests n slope calculation
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Interpolation ?
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Data display functions n desktop mapping n interactive modification of cartographic elements n graphic file export
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Functions and Operating Systems n What system(s) are supported? n How well does system engage OS? n How extensive is OS-based support? (e.g. Wizards, forums) n Where is the OS-framed help? Virtual organizations n How efficient is the combination?
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iClickers at the ready Google (“Geographic information system”) n A. 1,690,000 n B. 1,231,198 n C. 900,121 n D. 512, 761 n E. 423,859
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iClickers at the ready Google (Geographic information system) n A. 11,300,000 n B. 5,101,431 n C. 1,876,521 n D. 512, 761 n E. 423,859
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Functional capabilities are by- products of data structure n Raster systems work best in forestry, photogrammetry, remote sensing, terrain analysis, and hydrology. n Vector systems work best for land parcels, census data, precise positional data, and networks.
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Vector n Precision intact n Used when individual coordinates are important n More concise spatial description n Assumes feature model of landscape n Easy to transform data e.g. map projections
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Raster n Better for field data n Used by most imaging systems n Can be compressed n Easy to display and analyze n Many common formats n However, most systems now use both n Raster layer often backdrop-onscreen editing
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System selection n Research available systems n Build functional capabilities matrix n Plan needs and build needs/requirements matrix n Match functions against needs n Score and rank n Select, implement
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The Big Eight n Form the bulk of operational GIS in professional and educational environments n There are some significant differences among these “big eight” systems n Major differences in the most commonly packages by nation: Asia, South America, Europe
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ArcGIS ESRI Redlands, CA Market leader PC and workstation remarkable functionality many formats supported
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ArcPad Mobile GIS Designed for GPS and PDA Developer package Uses Windows CE IkeGPS
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AutoCAD MAP Windows all versions SQL DBF Access Extension to AutoCAD Menu-based Massive installed base Added grid, projection & topology support DB links good. 3D links good
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GRASS First UNIX GIS Developed by Army Corps of Engineers UNIX functionality Many unique functions Free until recently Many data sets Baylor University now supports
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IDRISI Developed at Clark University, Worcester MA Original in PASCAL, with open code Development uses a specialty Windows/DOS Spatial analysis/stats extensions
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Maptitude Caliper Corporation Consultancy TRANSCAD and GIS+ Many network solutions Windows Import/Export Address matching
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GeoMedia CAD software with GIS extensions Intergraph Corp, Huntsville AL Uses Windows NT Many parcel applications Web extensions, server tools etc.
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MapInfo Based in Troy, NY Mapping functions Uses Visual Basic Many applications Favored for 911, field
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2007 entry: Manifold
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2008 Entry: uDig Open source desktop GIS application framework, distributed under the LGPL license Ability to view, edit and print files, database (Oracle, SDE, PostGIS) and Web Feature Servers (WFS) An industry-standard extension framework (RCP) for adding new functionality to the application. Java functionality Native support for Windows, Mac OS/X and Linux. Developed by a world-wide community of contributors, with an open process and transparent decision making
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Open Source Coming Thick and Fast n Quantum GIS n uDig (uDig, JGrass, DivaGIS) n gvSIG n SAGA n JUMP (OpenJUMP, SkyJUMP, PirolJUMP, DeeJUMP) n ILWIS n KOSMO n MapWindowGIS
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Adding some GIS capabilities n GoogleEarth n Microsoft Virtual Earth n WorldWind n ArcExplorer
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A variety of issues should be considered in system selection: n cost n upgrades n LAN configuration support, Internet services n training needs n ease of installation n maintenance n documentation and manuals n help-line and vendor support n means of making patches n workforce
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iClicker: Compatibility How easy was the ArcGIS student copy to install and run? n A. Happened when I put in the CD n B. Minor problems, easily fixed n C. Some issues, fixed with help n D. Eventually fixed, but still crashes and runs incorrectly n E. Never got it installed, gave up
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Selecting a GIS can be a complex and confusing process n The intelligent GIS consumer should research, select, test, and question systems before purchase n Match needs and functionality, score and rank n Success means never having to start over n Plan for change at the outset
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Coming next….. GIS in Action
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