Lab 4 – Raster Analysis

Lab 4 – Raster Analysis

 

Lab4_Elevation-1
This lab focused on the processing, analysis, and display of raster data. In particular, we utilized the Raster Calculator, Aggregate, Focal Statistics, Con, Reclassify, Polygon to Raster, Raster to Polylines, Slope, Least Cost Path, Aspect, and Raster Clip tools. We used these tools to accomplish two goals: to create a Swiss Hillshade effect by layering a transparent DEM over two specialized Hillshades, and to use a weighted overlay to determine a least cost path across the North Cascades. The bottom two maps display Aspect and Slope of the same extent of the North Cascades.

Click this link to view a larger image of the map

Fenske_Model1-1

Click this link to view the annotated Model Builder used to make this map

 

Lab 4 Practical

 

Lab4_TradeRoutes-1
In order to try and pinpoint likely archeological sites in the North Cascades, we used a least cost analysis based off a weighted overlay to determine the easiest routes through the range where people might have traveled before roads existed in the area. The main parameters for this analysis were steepness of slope (steeper slope=more cost to travel across) and distance to streams (as people need to be near a water source when traveling). We removed waterbodies from the analysis as well, as humans are not likely to travel across lakes or large rivers. The map above shows the least cost paths between Winthrop and modern day coastal cities. Below is the model used to conduct this analysis.

Click this link to view a larger image of the above map

Fenske_Model2-1.PNG

Click this link to view a the Model Builder used to make this map