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Karen Hogenboom (with thanks to Leo Dion) Numeric and Spatial Data Librarian Reference, Research and Government Information Services.

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Presentation on theme: "Karen Hogenboom (with thanks to Leo Dion) Numeric and Spatial Data Librarian Reference, Research and Government Information Services."— Presentation transcript:

1 Karen Hogenboom (with thanks to Leo Dion) Numeric and Spatial Data Librarian Reference, Research and Government Information Services

2 Geographic Information (Systems/Science) Mapping disease dates back to 1855. The map below shows water pumps and deaths from cholera. The spatial representation of these two pieces of information help identify a relationship that would otherwise go unnoticed. Image from UC Santa Barbara Geography Dept.

3 The first law of geography according to Waldo Tobler: "Everything is related to everything else, but near things are more related than distant things.“ Tobler, “A Computer Movie Simulating Urban Growth in the Detroit Region.” Economic Geography 46 (1970), p.236

4 What is GIS? Spatial representation and analysis of information (attribute data) that is positioned to correspond to the same X, Y coordinates throughout the various map layers. Image from the US Geological Survey

5 Who is using GIS?  Biology, ecology, environmental sciences, forest science, geology, engineering, history, archeology, anthropology, literature, political science, business, economics, public health, medicine, education, public policy, geography, agriculture, urban planning, atmospheric sciences, library and information science, journalism, veterinary medicine, social work…historyliterature

6 Vector Data  Points, lines and polygons where position is relative to X, Y coordinate plane and intersects are possible. Image from National Geospatial Intelligence Agency

7 Three formats of vector data  Polygons Image from MIT

8 Three formats of vector data  Polygons  Lines Image from MIT

9 Three formats of vector data  Polygons  Lines  Points Image from MIT

10 Vector Data corresponds to a relational database housing the attribute data. This allows the user to perform analysis and queries. The example shows the Select by Attribute function. (Health)

11 Raster Data  Pixels in a continuous field where each pixel represents actual raw data. Image from School of Ocean and Earth Science and Technology, University of Hawaii

12 Chicago from Landsat. The resolution is 30 x 30 m for each pixel containing raw data: Seven wavelengths of light. A Landsat 7 image of Chicago, Illinois acquired on October 19, 2000.Landsat

13 Aerial Photographs can also be used as raster data. Urbana 1940, Historic Aerial Photo Imagebase UIUC

14 Digitizing Aerial Photographs requires matching a layer with an existing spatial reference to the unreferenced photograph.

15 Satellite Image of Chicago from Google Earth Added layers: roads, transportation, and buildings. Why can you integrate raster and vector data? Because of the underlying coordinate system.

16 Attribute Data OID countyName perIncome 0 DeWitt County 47415 1 Coles County 36007 2 Champaign County 44237 3 Douglas County 46166 4 Edgar County 40544 5 Ford County 46388 6 Iroquois County 44003 Etc…

17 Some GIS Data Resources  UIUC Library Numeric and Spatial Data Services  National Atlas   Illinois Natural Resources Geospatial Data Clearinghouse  FSGeodata Clearinghouse  International Geospatial Data Catalog Search  Illinois Data

18 Collect Your Own Data Geographic Positioning System (GPS) Georeference data by address

19 Map Making

20 Sante Fe, New Mexico in 3D with the use of a Satellite image and digital elevation model(DEM) NASA Landsat 7 perspective image of Santa Fe, NM. Landsat 7 image acquired on Oct. 14, 1999

21 Digital Elevation Model (DEM) (Geology) 3-D Models can be extrapolated from raster data. Mount St. Helen image from US Geological Survey

22 Projections, Coordinates & Metadata Projections allow spherical surface to be represented in planar format. Coordinates are NOT the same from one projection to the next. Conversions between projections allow for datasets to be used together. Metadata for the datasets will describe projections and much more. Metadata Projection Image from Rice University

23 Why are Projections Important? You won’t have to wonder why New York City is just off the coast of Delaware or the capital of Maine is in the middle of the Atlantic Ocean. Image from University of Colorado Dept. of Geography

24 Buffering tool creates an area (criteria) for inclusion or exclusion of features. Here developers can determine parcels to be excluded and total cost due to government building codes. (Urban Planning)

25 Latino population by percentage in districts of Boise shows a distribution. (Demographics)

26 Online mapping examples  National Atlas  AfricaMap http://cga-  SimplyMap (UIUC subscription) tid=770081 tid=770081  Census Bureau thematic maps aps_1 aps_1

27 University of Illinois Resources  Map and Geography Library: Data sets, GIS reference, books and journals, aerial photos, paper maps.  ATLAS: Supports LAS research, classes in GIS & Statistical software, and data sources. 608 S. Matthews, U; (217) 333-6300  ESRI Development Center: training in usingArc GIS for spatial analysis;  Data Services @ The University Library (1-4 Mon- Wed and Friday; also by appointment)

28 Introductory Classes & Workshops at Illinois  ATLAS: Getting Started with ArcGIS (Gives general overview of operating ArcGIS).  ESRI Development Center: three advanced workshops about spatial analysis  Geography 379: Intro to GIS (thorough overview of GIS including use of ArcGIS, raster, vector, geodatabases, geocoding, statistical & spatial analysis, and modeling)  Geography 476: Applied GIS to Environmental Studies.  Geography 477: Intro to Remote Sensing.  LIS 490GIG: Geographic Information Systems.

29 Please feel free to contact me for further assistance. Karen Hogenboom 333-2472

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