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Environmental GIS

Environmental GIS. Nicholas A. Procopio, Ph.D, GISP nick@drexel.edu. Question?. Can we develop a measure of habitat integrity using land-cover data? What is the best way to evaluate this? What spatial tools will accommodate this analysis?. Spatial analysis toolbox.

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Environmental GIS

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  1. Environmental GIS Nicholas A. Procopio, Ph.D, GISP nick@drexel.edu

  2. Question? • Can we develop a measure of habitat integrity using land-cover data? • What is the best way to evaluate this? • What spatial tools will accommodate this analysis? Spatial analysis toolbox

  3. Land-use/Land-cover data (2007)

  4. …and rasterized!!!!

  5. Notice the pixelization.

  6. Spatial Analyses • Reclassify • Reclassifies (or changes) the values in a raster. • Reclass cover types as habitat (1) or nonhabitat (0)

  7. Spatial Analyses • Focal Stat. • Calculates for each input cell location a statistic of the values within a specified neighborhood around it.

  8. Sum all the pixels in a 1000 meter radius surrounding each pixel. • This value can than be normalized as a percentage of the maximum possible.

  9. Focal Statistic Output

  10. Intermediate steps… • Convert to float values. {Float} Converts each cell value of a raster into a floating-point representation. (continuous value to floating point values). • Recalculate as a percentage of window maximum. {Divide} • Window max = 100 pixels radius, pi*100^2 = 31417 pixels

  11. Focal Statistic Output, as a percentage 100 habitat integrity? 0

  12. X {times} 0/1 data Cell value habitat integrity less altered lands

  13. Reclassify decimal values to categories.

  14. 10 meter DEM

  15. Slope (three cell neighborhood)

  16. Slope (three cell neighborhood)

  17. Aspect

  18. Aspect

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