Reese's GIS Expedition

     This week, in the sixth and final Special Topics in Geographic Science lab, was about Scale Effect and Spatial Data Aggregation.     This weeks was broken into a few parts and has us analyzing scale and how it effects our data, as well as the aggregation of spatial data fore more governmental things such as gerrymandering.      So with the first part of the lab, we took data on hydrographic lines and polygons of a county and examined their lengths and details to one another. What we saw is that when the scale is increased, more detail and length is decreased. You can see this below in a screenshot from the lab where our highest scale, which is medium, is eclipsed in lengths as high goes father and the normal flowlines goes the farthest.      The next part was more of the same where we analyzed a DEM layer and resamples it. In this part we started by changing the resolution by 1 then 2, 5, 10, 30 and 90 meters. What we saw is th...

     This week, in the fifth Special Topics in Geographic Science lab, was about Interpolation with concerns to surfaces.     This lab was broken into two parts, the first half had us comparing Spline and IDW Interpolations to each other and the second half had us analyzing water quality with different interpolations.           With the first half, we were introduced to Spline and how to use it properly while also comparing it to IDW/DEM interpolation. Once we had produced the Spline, we then subtracted it with the Raster Calculator tool from IDW in order to see the differences between the two. What we saw was areas that were more negative were more aligned to IDW but areas that were more positive where aligned to Spline. This was in part because of the elevation differences between the two Interpolation methods and their variance on the points they came from. This is especially true for areas where they were equal, which causes a d...