Chris Stephenson UWF GIS Blog

 This module taught us how to process compressed LiDAR data (.laz files) and convert them into usable datasets for forest analysis in ArcGIS Pro.We built and distinguished between Digital Elevation Models (DEMs) that represent bare ground and Digital Surface Models (DSMs) that capture the forest canopy, understanding how different point classifications create these critical layers. The core forest measurement technique involved calculating tree heights by subtracting ground elevation from surface elevation (DSM - DEM = Height), providing precise vegetation measurements across the landscape. We developed skills in creating canopy density maps by analyzing the ratio of vegetation points to total LiDAR returns, giving foresters essential information about forest biomass and coverage intensity. Below, I have my final product showing the canopy density near Big Meadows recreation area in Shenandoah National Park.

     In this crime analysis module, I explored how GIS can help law enforcement identify crime hotspots using real data from Washington DC and Chicago. I started by mapping burglary rates in DC, normalizing the data by housing units to create a fair comparison across neighborhoods, and used kernel density analysis to visualize assault patterns as smooth "heat maps" showing crime concentration. The kernel density technique was particularly effective at revealing clustering patterns that weren't obvious when just looking at individual crime points.      The most interesting part involved comparing three different hotspot mapping techniques using Chicago homicide data: grid-based mapping, kernel density analysis, and Local Moran's I statistical clustering. I tested each method's effectiveness by using 2017 crime data to predict where 2018 homicides would occur. The analysis revealed important trade-offs between accuracy and area coverage - methods that capture...

Hi! I'm Chris. Please see my story map  here ! I am a USAF veteran utilizing the VA VR&E program. I am a graduate student looking to expand on my GIS knowledge. I served as a Geospatial Analyst for 12.5 years and currently hold a B.S. in Geography and B.S. in GIS.  My story map is being re-used from the Cartography course, but the information still applies! Nothing has changed to much since March!