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Cost analysis

This demonstrates various steps on the path to determining the optimal routes from a point with a high density of children to the nearest sizable park.
  • Primary tools included spatial analyst suite; manual input of raster calculator and map algebra.

  • Click on images for expanded versions and further context.

Applying spatial analyst skills to local datasets
Hot/cold spots of child density

Hot/cold spots of child density

These demonstrate the statistically relevant locations of child density.

Slope

Slope

This depicts the general trends of slope change for each cell. (after revising the elevation rasters and generating a hillshade, previous full extents)

Slope reclass (zoomed in)

Slope reclass (zoomed in)

This re-classified the slope raster to better represent it and match the other raster scales.

Road raster

Road raster

This converts the road lines into a raster format, to be considered in the raster calculations. It does introduce some flaws in cells being so large as to create confusion at some gaps where multiple road segments may be near one another.

Euclidian Distance

Euclidian Distance

This takes a large cluster of those child density spots and draws the Euclidean distance (straight line/"as the crow flies") from its centroid.

Distance reclassed (quantile)

Distance reclassed (quantile)

This reclassifies that distance in quantile format, which places a greater weight on the closer points.

Cost calculated

Cost calculated

This is one of the final steps required to produce the purple lines, after using raster calculator to weigh the relationship between the rasters representing roads, slope, and distance.

Backlinks

Backlinks

These represent the "lowest cost" direction to travel from that given cell back to the source location.

End product (zoomed in)

End product (zoomed in)

Full extent - Hillshade

Full extent - Hillshade

Full extent - Slope

Full extent - Slope

Full extent - Euclidian distance

Full extent - Euclidian distance

Full extent - Distance (quantile)

Full extent - Distance (quantile)

Full extent - Calculated

Full extent - Calculated

Multiplies out the cell values of each raster on a weighed scale (Road then slope then kid distance) and then indicates the total value with darker as lower values and lighter as higher.

Full extent - Cost distance

Full extent - Cost distance

dycl_image_11_backlink.png

dycl_image_11_backlink.png

© 2015 by DYCL/David Y. Lee. Created with Wix.com

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