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Geospatial Data Modeling and Analysis

Geospatial Data Modeling and Analysis. CE 697V Final Project, Fall 2006. Problem Definition. The Lamoille (Vermont) government plan to build a new road between the existing road and the Airport They ask a GIS specialist to do an Spatial Analysis to find a suitable place to build the new road.

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Geospatial Data Modeling and Analysis

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  1. Geospatial Data Modeling and Analysis CE 697V Final Project, Fall 2006 Yannian Zhu

  2. Problem Definition • The Lamoille (Vermont) government plan to build a new road between the existing road and the Airport • They ask a GIS specialist to do an Spatial Analysis to find a suitable place to build the new road Yannian Zhu

  3. Existing Route Study Area Total 33 miles, about 1hour drive (Google Earth) Yannian Zhu

  4. Available Data • LandUse/LandCover • Digital Elevation Model • Position of Airport and Destination points Yannian Zhu

  5. Steps • DEM -> Slope map • Create Airport Distance map (Grid, each pixel’s value represent the distance to the Airport) • Reclassify all the components (for the Overlay Procedure) • Make Weighted Overlay between DEM, Slope, LandUse/LandCover and Distance to Airport as Cost map • Use Spatial Analysis tools to calculate Cost Distance map and Cost Direction map • Shortest Path will be created by Cost Distance and Cost Direction maps Yannian Zhu

  6. Path Selection Factors • Elevation (Lower more suitable) • Slope (smaller more suitable) • Distance to Airport (nearer more suitable) • LandUse/LandCover (suitable and unsuitable landUse type) Yannian Zhu

  7. Elevation • DEM will be reclassified to 10 classes, value from 10 to 1, lower region more suitable for new road so get higher value Yannian Zhu

  8. Slope • Slope will be reclassified to 10 classes, value from 10 to 1, small slope get higher value Yannian Zhu

  9. Distance • Distance will be reclassified to 10 classes, value from 10 to 1, shorter distance get higher value Yannian Zhu

  10. LandUse/LandCover • Base on LandUse/LandCover type, appoint value to them. E.g. Agriculture is protected; Wetlands could be unstable geological structure so it is restricted; Water, we should build bridge (expensive) so value is low; Build up includes residential, commercial and roads, still not easy to handle; Forest, Brush and Barren land are suitable for build roads so they are high value Yannian Zhu

  11. Weighted Overlay • Weighted Overlay all the factors equally influence, each as 25% • Higher value more suitable for build the new road • As mentioned before, this result will be used as Cost map, so we should reclassify it to more suitable region lower value (lower cost), unsuitable region higher value (high cost) Yannian Zhu

  12. Cost Map • Suitable region lower cost, unsuitable region higher cost Yannian Zhu

  13. Cost Distance and Cost Direction map Cost Distance Cost Direction Yannian Zhu Created by Spatial Analyst – Distance – Cost Weighted command

  14. Shortest Path Yannian Zhu Created by Spatial Analyst – Distance – Shortest Path

  15. N Yannian Zhu Measure the new route by Google Earth approximately 12 miles

  16. New road will connect to current road Yannian Zhu

  17. Thanks for your patience to finish this long PPT! Yannian Zhu

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