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GEOG 121 Project 3

GEOG 121 Project 3. By: Fiana York Megan Wallace Dustin Dodd Thomas Hood. Introduction . Objective of project 3 is to: Demonstrate your ability to find, download, comment, and view national map data. 3 different types of national map data used in this project.

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GEOG 121 Project 3

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  1. GEOG 121 Project 3 By: Fiana York Megan Wallace Dustin Dodd Thomas Hood

  2. Introduction • Objective of project 3 is to: • Demonstrate your ability to find, download, comment, and view national map data

  3. 3 different types of national map data used in this project • Digital Elevation Model (DEM) • Vector Layers or Digital Line Graph (DLG) • Digital Orthophoto Quarter Quadrangle (DOQQ)

  4. DEM • Digital elevation models that show elevation • Based on topographic maps • Usually DEMs are made by photogrametry, from aerial photos

  5. How to find a DEM map • Go to http://edc.usgs.gov/geodata/ • Under “1:250,000 Scale Digital Elevation Models (DEM)” click on Alphabetical List • Find a DEM Map in one of the folders and then “Save to Disk” • Double Click on it on the Desk Top • It should then open up Win Zip. Then Press - “Use Evaluation Version”

  6. How to find a DEM map • Open the Archive using the “Classic interface” then press ok • Double Click on your file and then you should get a screen with a lot of numbers go to File then save it to the Desktop. • Go to Start, Programs, Geog 121, and then dlvg32 • Drag the file saved on the desk top onto the dlvg32 Pro program

  7. How to find a DEM map (Cont.) • It will ask what overlay you want. Click on USGS/CDED DEM. • It should look like this of your area.

  8. DEM map (cont.) • Now you need to make sure the dlvg32 program with your DEM map on is selected. • Press “Alt-Print Screen.” That will copy the program that you have active as an image. Proceed to either Word or FrontPage and “Paste” (It eventually has to go to FrontPage anyways.)

  9. Completing the DEM map • Under the image you will need to include the following information: • the area covered by your DEM • where you acquired the data (http://edc.usgs.gov/geodata/) • the resolution of your DEM (If you used the above link it should be 10) • the software you used to create the image (dlgv32 Pro) • your comments on the landforms revealed in the DEM

  10. DLG • DLG graphs are made up of points and line segments that connect the points • An area is formed by 3 or more segments

  11. DLG Cont. • DLG shows: • Hydrography • Transportation data • Political boundaries • Exc.

  12. How to find a DLG map • How to find a DLG (digital line graph map), we used the website: • http://arcdata.esri.com/data/tiger2000/tiger_download.cfm.

  13. How to find a DLG map • Pick your state, county, and the different overlaying options (Line Features: roads, hydrography, landmarks, etc.) • Once you do this, download the file and use WinZip to unzip your files.

  14. What you’ll need in the write up • discuss the following points in your write-up: • Area covered by Map • Where you acquired the data • Types of Map layers (ex.Boundaries, transportation, hydrography, etc.) • Software used to create the map • Comments on the Types of entities represented by Vector data (Example: Why you chose certain colors to represent certain things).

  15. * NOTE: It is difficult to open the files into ArcMap, so we just dragged the Highlighted box (in the middle with the A) into ArcMap, and it opened up just fine.

  16. DOQQ • Are raster images of rectified aerial photos • Only covers a quarter of an area of a topographic quadrangle (3.7 min. of latitude and longitude)

  17. DOQQ cont. • They are produced by electronically scanning, then orthorectifying black and white aerial photos • Used to edit existing vector data • All DOQQs are cast on UTM projection Zones • 90% of well defined points appear within 20ft of there actual position

  18. How to find a DOQQ image • Go to http://earthexplorer.usgs.gov • Log in as guest • Under the “Spatial Coverage Section” enter in the coordinates of your hometown (or search for them within the earth explorer)

  19. DOQQ image (cont.) • Select data set and under Arial photography select the Digital Orthophoto Quadrangle box • Now click continue and then search • When the results come up click “show” to view an image • Pick a DOQQ and save it in your www folder • Now its ready to be put directly into your project write up

  20. Sources • DiBiase, David (2006) Understanding Geographic Data. Module 3: Aerial Photographs and Planimetric Data, and Module 4: Elevation Data. ESRI Virtual Campus http://training.esri.com Accessed October, 2006. • The Pennsylvania State University and the Pennsylvania Governor's Office of Administration, Office for Information Technology, Geospatial Technologies Office (2006) Pennsylvania Spatial Data Access - Data Access Wizard. http://www.pasda.psu.edu Accessed October, 2006. • Environmental Systems Research Institute (ESRI) (2006) ArcGIS - ArcMap Software. http://www.esri.com Accessed October, 2006. Note: ArcMap software is installed in the Geography Instructional Computing Laboratory in Room 208 Walker Building. • Environmental Systems Research Institute (ESRI) (2006) ArcExplorer Software. http://www.esri.com/software/arcexplorer/index.html Accessed October, 2006. Note: ArcExplorer is a freely downloadable simplified version of ArcMap. • United States Geological Survey (2002) Geographic Names Information System. http://geonames.usgs.gov Accessed 23 July 2002. • United States Geological Survey (2002) USGS Geographic Data Download. http://edc.usgs.gov/geodata/ Accessed 3 August 2002.

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