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Desktop, Mobile & Web Based GIS/ Collaborative GIS Lecture 4.

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Presentation on theme: "Desktop, Mobile & Web Based GIS/ Collaborative GIS Lecture 4."— Presentation transcript:

1 Desktop, Mobile & Web Based GIS/ Collaborative GIS Lecture 4

2 Desktop GIS Create, edit, and analyze geographic data on your desktop computer. Create, edit, and analyze geographic data on your desktop computer. See your data on a map. See your data on a map. Analyze your data to reveal patterns, relationships, and trends that are not readily apparent in tabular format. Analyze your data to reveal patterns, relationships, and trends that are not readily apparent in tabular format. Create publication quality, professional maps. Create publication quality, professional maps.

3 ArcGIS Desktop is software that allows you to discover patterns, relationships, and trends in your data that are not readily apparent in databases, spreadsheets, or statistical packages. ArcGIS Desktop

4 Desktop GIS Advantages Advantages You have all the data and processing at your stationYou have all the data and processing at your station Disadvantages Disadvantages You must invest in the processor and storage space Data and maps are not easily shared

5 Mobil GIS Mobile GIS is the expansion of a geographic information system (GIS) from the office into the field. A mobile GIS enables field based personnel to capture, store, update, manipulate, analyze, and display geographic information.

6 Mobile GIS integrates one or more of the following technologies: Mobile devices Mobile devices ArcGIS MobileArcGIS MobileArcGIS MobileArcGIS Mobile ArcPadArcPadArcPad StreetMap Mobile Software Developer KitStreetMap Mobile Software Developer KitStreetMap Mobile Software Developer KitStreetMap Mobile Software Developer Kit Global Positioning Systems (GPS) Global Positioning Systems (GPS) Wireless communications for Internet GIS access Wireless communications for Internet GIS access

7 Mobile GIS Advantage Advantage PortablePortable Allows for some map processingAllows for some map processing Disadvantages Disadvantages Minimal storage space Need a desktop for most processing

8 Web Based GIS Access 2D maps, 3D globes, reference layers, and functional tasks via the Web to support your GIS work. Access 2D maps, 3D globes, reference layers, and functional tasks via the Web to support your GIS work. Contribute your own data for publishing through ArcGIS Online and make it broadly available to other users. Contribute your own data for publishing through ArcGIS Online and make it broadly available to other users. Purchase the data you see in ArcGIS Online and publish it on your own server. Purchase the data you see in ArcGIS Online and publish it on your own server.

9 Web Based GIS Advantages Advantages Minimal processor and storage space neededMinimal processor and storage space needed Many data sets availableMany data sets available The processor on the web server is likely to be more powerful than your desktop unitThe processor on the web server is likely to be more powerful than your desktop unit Disadvantages Disadvantages Must have a fast network connection Data resides off site Dependent on resources off site, not under your control

10 Collaborative GIS Web Based GIS where multiple users can add data to a single map. Web Based GIS where multiple users can add data to a single map.

11 Collaborative GIS Advantages Advantages Allows for input from:Allows for input from: Multiple Users Multiple Users Multiple Data Sets Multiple Data Sets Multiple Perspectives Multiple Perspectives Disadvantages Disadvantages Lack of control over input to the map and revisions

12 Raster vs. Vector Lecture 5

13 Raster and Vector Reality Raster and Vector Reality One of the sharpest distinctions among GIS is the way that location is represented in a database, as either a raster or vector position. One of the sharpest distinctions among GIS is the way that location is represented in a database, as either a raster or vector position. These materials were developed by Kenneth E. Foote and Donald J. Huebner, Department of Geography, University of Texas at Austin, 1996.

14 Raster vs. Vector "Raster is vaster, Vector is more correcter"

15 The Raster View of the World A raster based system displays, locates, and stores graphical data by using a matrix or grid of cells. A raster based system displays, locates, and stores graphical data by using a matrix or grid of cells. Each cell has an (x,y) location and a (z) value which stores attribute data about that location. Each cell has an (x,y) location and a (z) value which stores attribute data about that location.

16 The Vector View of the World A vector based system displays graphical data as points, lines or curves, or areas with attributes.

17 Advantages and Disadvantages MethodAdvantagesDisadvantages Raster Simple data structure Simple data structure Compatible with remotely sensed or scanned data Compatible with remotely sensed or scanned data Simple spatial analysis procedures Simple spatial analysis procedures Requires greater storage space on computer Requires greater storage space on computer Depending on pixel size, graphical output may be less pleasing Depending on pixel size, graphical output may be less pleasing Projection transformations are more difficult Projection transformations are more difficult More difficult to represent topological relationships More difficult to represent topological relationships Vector Requires less disk storage space Requires less disk storage space Topological relationships are readily maintained Topological relationships are readily maintained Graphical output more closely resembles hand- drawn maps Graphical output more closely resembles hand- drawn maps More complex data structure More complex data structure Not as compatible with remotely sensed data Not as compatible with remotely sensed data Software and hardware are often more expensive Software and hardware are often more expensive Some spatial analysis procedures may be more difficult Some spatial analysis procedures may be more difficult Overlaying multiple vector maps is often time consuming Overlaying multiple vector maps is often time consuming These materials were developed by Kenneth E. Foote and Donald J. Huebner, Department of Geography, University of Texas at Austin, 1996.

18 Raster data can be converted to Vector and vice versa Note: Converting from one system to the other can introduce error. These materials were developed by Kenneth E. Foote and Donald J. Huebner, Department of Geography, University of Texas at Austin, 1996.


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