Mapping Your Data 2


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Presentation I used for the second mapping your data workshop. Markedly better then the first.

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  • Mapping Your Data 2

    1. 1. Mapping Your Data Christopher Martin [email_address]
    2. 2. About Me <ul><li>Geography Major </li></ul><ul><li>Computer Science Minor </li></ul>
    3. 3. Outline <ul><li>Data Types/Models </li></ul><ul><li>Data Sources </li></ul><ul><li>Map Types </li></ul><ul><li>Demos </li></ul>
    4. 4. Tools of the Trade <ul><li>Cartographic Software </li></ul><ul><ul><li>ArcMap </li></ul></ul><ul><ul><li>Other </li></ul></ul><ul><ul><ul><li>(uDig, QGIS, GRASS) </li></ul></ul></ul><ul><li>“ Mapping” Libraries/Tools </li></ul><ul><ul><li>Google Earth, Google Maps, OpenLayers </li></ul></ul>
    5. 5. Data Models <ul><li>Two primary data models used when making maps </li></ul><ul><ul><li>Raster Data </li></ul></ul><ul><ul><li>Vector Data </li></ul></ul>
    6. 6. Raster Data <ul><li>Consists of discrete cells (think graph paper) </li></ul><ul><ul><li>Each cell has a discrete value </li></ul></ul><ul><ul><li>Occur in rows and columns </li></ul></ul><ul><li>Examples </li></ul><ul><ul><li>Images (all image types) </li></ul></ul><ul><ul><li>DEM </li></ul></ul>
    7. 7. Vector Data <ul><li>Each position is represented by coordinates </li></ul><ul><li>Coordinates are connected to form lines or polygons </li></ul><ul><li>Points, lines and polygons are then used to represent geographic features </li></ul><ul><li>Examples </li></ul><ul><ul><li>Shapefile </li></ul></ul>
    8. 8. Points, Lines, Polygons
    9. 9. Data Sources <ul><li>US Census Bureau </li></ul><ul><ul><li>Not just population data </li></ul></ul><ul><ul><li>Generalized Boundary Data </li></ul></ul><ul><li>ESRI </li></ul><ul><ul><li>TIGER/LINE </li></ul></ul><ul><ul><li>NED Data </li></ul></ul><ul><ul><li>FEMA Q3 Flood Data </li></ul></ul><ul><li>USGS </li></ul><ul><ul><li>SEAMLESS Distribution </li></ul></ul>
    10. 10. Data Sources (cont’d) <ul><li>NYS GIS Clearing House </li></ul><ul><ul><li>Membership required </li></ul></ul><ul><ul><li>Wide variety of data </li></ul></ul><ul><li>CUGIR </li></ul><ul><ul><li>NYS and National data </li></ul></ul><ul><ul><li>Free, huge variety </li></ul></ul><ul><li>CIGAR </li></ul><ul><ul><li>Worldwide Elevation Data </li></ul></ul><ul><li>Columbia University EDS </li></ul><ul><ul><li>Electronic Data Service </li></ul></ul>
    11. 11. Data Sources (cont’d) <ul><li>Geography Network </li></ul><ul><ul><li>Aggregates data from different providers </li></ul></ul><ul><ul><li>Online Map Server Available </li></ul></ul>
    12. 12. Data Quality <ul><li>Meta Data </li></ul><ul><ul><li>Data about the data </li></ul></ul><ul><ul><li>All legitimate providers will provide this </li></ul></ul><ul><ul><li>Available for download or online viewing </li></ul></ul>
    13. 13. Map Types <ul><li>Thematic Maps </li></ul><ul><ul><li>Not reference maps </li></ul></ul><ul><li>Four main types </li></ul><ul><ul><li>Choropleth Map </li></ul></ul><ul><ul><li>Proportional Map </li></ul></ul><ul><ul><li>Isarithmic Map (contour) </li></ul></ul><ul><ul><li>Dot Map </li></ul></ul>
    14. 14. Choropleth Map <ul><li>Shaded Areas </li></ul><ul><ul><li>The “color” of the shade varies based on measurement of our variable </li></ul></ul>
    15. 15. Isarithmic Map <ul><li>Also known as Contour Maps </li></ul><ul><ul><li>We draw lines to connect separate variables that have the same value </li></ul></ul>
    16. 16. Proportional Symbol Map <ul><li>Uses symbols </li></ul><ul><ul><li>The size of the symbol varies according to the variable </li></ul></ul>
    17. 17. Dot Density Map <ul><li>Uses dots </li></ul><ul><ul><li>Size is uniform, but the concentration represents changes in the variable </li></ul></ul>
    18. 18. Cartograms <ul><li>Are NOT maps </li></ul><ul><ul><li>Area is not preserved </li></ul></ul><ul><ul><li>Area of the geographic regions varies by variable </li></ul></ul><ul><li>Two primary types </li></ul><ul><ul><li>Area </li></ul></ul><ul><ul><ul><li>Area gets larger or smaller depending on the variable </li></ul></ul></ul><ul><ul><li>Distance </li></ul></ul><ul><ul><ul><li>Nodes or places can be closer or farther depending on realtive distance </li></ul></ul></ul>
    19. 19. Cartogram
    20. 20. File Formats <ul><li>Shapefile </li></ul><ul><ul><li>A collection of points, lines and polygons </li></ul></ul><ul><ul><li>Tabular data values assocated with each </li></ul></ul><ul><li>DEM </li></ul><ul><ul><li>Raster data, each cell represents elevation </li></ul></ul><ul><ul><li>Comes in different resolutions </li></ul></ul>
    21. 21. Demo Time! <ul><li>Gathering Data </li></ul><ul><li>Converting Data </li></ul><ul><ul><li>Geocoding </li></ul></ul><ul><ul><li>Getting Data Into Arc Map </li></ul></ul><ul><li>Making a Map </li></ul><ul><ul><li>ArcMap </li></ul></ul><ul><ul><li>Google Earth </li></ul></ul><ul><ul><li>Google Maps/OpenLayer </li></ul></ul>
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