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: Clipping the LA City Boundaries to the Census LA County Boundary

You may notice that the boundaries for some cities extend into the ocean. In this scenario, you will want to exclude areas over water. To do this, you will use county boundaries as defined by the U.S. Census Bureau. Navigate to the United States Census Bureau website and locate the cartographic boundary shapefiles for U.S. counties. Choose the 500k resolution and download the file. Decompress the file in your original folder and check the spatial reference. If necessary, use the Project tool to create a copy of the data with the NAD 83 UTM Zone 11 spatial reference system. Add the layer with the correct spatial reference to your Table of Contents. Create a layer based on the Los Angeles County boundary. Clip the LA cities layer and use the Los Angeles County boundary as the clip feature. This clip operation ensures that your density surface model serves your needs while excluding the areas over the Pacific Ocean.

An image of the Los Angeles County layer added to the map
A temporary selection layer was created from the selected features. You can export the data to create a permanent shapefile if desired.