Land Use Change In Plano and Allen, Texas From 1990 to 2000   The Effect on Nitrogen Levels in Storm Water Run Off
Project Objectives <ul><li>General objectives </li></ul><ul><li>Application of spatial analyst and modeling tools and meth...
Data Sources <ul><li>North Central Texas Council of Governments </li></ul><ul><li>Land use shape files </li></ul><ul><li>C...
Steps: <ul><li>Conversion from feature data to raster data. </li></ul><ul><li>Determining areas of change in land use type...
1990 Land Use Raster Feature to Raster Conversion Source:  North Central Texas Council of Governments
2000 Land Use Raster   Feature to Raster Conversion Source:  North Central Texas Council of Governments
Determining Areas of Change   Raster Calculator Areas of change were determined by using Raster Calculator.  The land use ...
Reclassification for Areas of Change   Spatial Analyst Reclassify <ul><li>The areas of change were then reclassified: </li...
Land Use Change Areas
Land Use Change By 2000 Land Use Type Raster Calculator was used to isolate areas of change from 1990 to 2000 by their 200...
Reclassification By Nitrogen Loading Based On Land Use Type   Spatial Analyst Reclassify Source:  http://www.savethebay.or...
Nitrogen Load by Land Use After Reclassification
Plano and Allen, Texas Raster File   Feature to Raster Conversion Source:  North Central Texas Council of Governments
Watershed Raster File   Feature to Raster Conversion Source:  North Central Texas Council of Governments
Basin Generation Hydrology Watershed <ul><li>Generating a watershed through the use of elevation data is a common task in ...
Original NED Elevation
Allen Land Use Change Overlay on NED Elevation
NED Data Hydrology Fill Sinks 2,447 Sinks were  Identified and filled.
Flow Direction Hydrology Flow Direction Drainage channels are easy to identify even at this point.
Flow Accumulation Hydrology Flow Accumulation
Basins with Land Use Overlay Hydrology Watershed Basins generated using threshold to generate area.
Zonal Sum By City Lbs.
Zonal Sum By Watershed Lbs.
Zonal Sum By Basin
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Nigtrogen Pollution Change Due to Land Use Changes in the Plano/Allen area.

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Nigtrogen Pollution Change Due to Land Use Changes in the Plano/Allen area.

  1. 1. Land Use Change In Plano and Allen, Texas From 1990 to 2000 The Effect on Nitrogen Levels in Storm Water Run Off
  2. 2. Project Objectives <ul><li>General objectives </li></ul><ul><li>Application of spatial analyst and modeling tools and methodology to data to achieve possible “real-world” applications. </li></ul><ul><li>Specific objectives </li></ul><ul><li>Identify areas of land use change in the city of Plano and Allen, Texas and summarize their effect on nitrogen loading in storm water runoff. </li></ul>
  3. 3. Data Sources <ul><li>North Central Texas Council of Governments </li></ul><ul><li>Land use shape files </li></ul><ul><li>City boundary shape files </li></ul><ul><li>Watershed boundary shape files </li></ul><ul><li>Source: www.dfwinfo.com </li></ul><ul><li>United States Geological Survey </li></ul><ul><li>NED (National Elevation Dataset) raster files </li></ul><ul><li>Source: http://seamless.usgs.Gov </li></ul>
  4. 4. Steps: <ul><li>Conversion from feature data to raster data. </li></ul><ul><li>Determining areas of change in land use type using raster calculator. </li></ul><ul><li>Reclassification of land use type by nitrogen loading. </li></ul><ul><li>Zonal sum of nitrogen loading by city and watershed. </li></ul><ul><li>Creation of drainage basin data for pollutant summary. </li></ul><ul><li>Zonal sum of nitrogen loading by predefined drainage basin area. </li></ul>
  5. 5. 1990 Land Use Raster Feature to Raster Conversion Source: North Central Texas Council of Governments
  6. 6. 2000 Land Use Raster Feature to Raster Conversion Source: North Central Texas Council of Governments
  7. 7. Determining Areas of Change Raster Calculator Areas of change were determined by using Raster Calculator. The land use codes for 1990 were subtracted from the land use codes for 2000, resulting in a VAT of the differences. [lu_00] – [lu_90] Value of 0 = No Change All other values = Change in land use This only works when land use codes remain consistent from 1990 to 2000 Change No change
  8. 8. Reclassification for Areas of Change Spatial Analyst Reclassify <ul><li>The areas of change were then reclassified: </li></ul><ul><ul><li>“ NoData” for values of 0. </li></ul></ul><ul><ul><li>“ 1” for all other values. </li></ul></ul><ul><li>The resulting raster layer could then be used as a filter to identify areas of change in the 2000 land use layer. </li></ul>
  9. 9. Land Use Change Areas
  10. 10. Land Use Change By 2000 Land Use Type Raster Calculator was used to isolate areas of change from 1990 to 2000 by their 2000 land use codes. [lu_change] * [lu_00]
  11. 11. Reclassification By Nitrogen Loading Based On Land Use Type Spatial Analyst Reclassify Source: http://www.savethebay.org/land/environment/pollution/water.html Conversion: Cell Size 2 = 2,500 sf Acre = 43,560 sf Conversion: 2,500 / 43,560 = 0.057 Pounds (acre) * 0.057 = Pounds (cell)
  12. 12. Nitrogen Load by Land Use After Reclassification
  13. 13. Plano and Allen, Texas Raster File Feature to Raster Conversion Source: North Central Texas Council of Governments
  14. 14. Watershed Raster File Feature to Raster Conversion Source: North Central Texas Council of Governments
  15. 15. Basin Generation Hydrology Watershed <ul><li>Generating a watershed through the use of elevation data is a common task in GIS. </li></ul><ul><li>Watersheds can be generated using pour points to define total upstream area from a point. </li></ul><ul><li>However, they can also be generated for local areas of study within a larger watershed by defining basins using a minimum number of cells to determine area. </li></ul><ul><li>The process is much the same as used in class, but instead of selecting the “points” options, use “threshold” size. </li></ul>
  16. 16. Original NED Elevation
  17. 17. Allen Land Use Change Overlay on NED Elevation
  18. 18. NED Data Hydrology Fill Sinks 2,447 Sinks were Identified and filled.
  19. 19. Flow Direction Hydrology Flow Direction Drainage channels are easy to identify even at this point.
  20. 20. Flow Accumulation Hydrology Flow Accumulation
  21. 21. Basins with Land Use Overlay Hydrology Watershed Basins generated using threshold to generate area.
  22. 22. Zonal Sum By City Lbs.
  23. 23. Zonal Sum By Watershed Lbs.
  24. 24. Zonal Sum By Basin

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