Exploring Patterns of Crime In Los Angeles County Using A Density Surface Model

Table of Contents

  1. Exploring Patterns of Crime In Los Angeles County Using A Density Surface Model
  2. Setting up Your Workspace
  3. Preparing the Data
  4. Skill Drill: Clipping the LA City Boundaries to the Census LA County Boundary
  5. Skill Drill: Adding XY Data
  6. Skill Drill: Clipping the Crime Data to the Census LA County Boundary
  7. Skill Drill: Creating a Subset of the Data Based on Crime Category
  8. Changing Global Environment Settings for Raster Processing
  9. Creating a Density Surface Model Using the Simple Method
  10. Creating a Density Surface Model Using the Kernel Method
  11. Skill Drill: Creating A Density Surface Model Based on Your Criteria

Skill Drill: Creating a Subset of the Data Based on Crime Category

While it may be useful to map overall crime across Los Angeles County, the dataset can also provide answers to questions about specific types of crimes. In this instance, you will create a density surface model based on incidents of drunk driving.

In this dataset, incidents related to drunk driving have the following STAT codes and descriptions:

241 – DRUNK DRIVING – VEHICLE/BOAT: Alcohol/Drugs (Injury/Death), Felony

242 – DRUNK DRIVING – VEHICLE/BOAT: Alc/Drugs

243 – DRUNK DRIVING – VEHICLE/BOAT: Alcohol at .08% Or Above

245 – DRUNK DRIVING – VEHICLE/BOAT: Drugs Only

Use an attribute selection to select the records for each incident type. Create a layer based on the selected records.

An image of the drunk driving incidents layer added to ArcMap
From an attribute selection, you can create a temporary selection layer or export the data as a permanent shapefile.