GIS Crash Analysis for Beginners: Custom Applications to Assist Novice GIS Users in Crash Data Analysis
GIS Analysis Tools Performs Standard Queries –Normalize Data –Reduce Errors Allows Data Query To Follow On Spatial Selection/Associa tion Provides Common Dbf IV Output Table
Standardize Queries Normalize Data –Many Crash Data Questions Examine Multiple Fields –Allows User Without Relational Database Management Skills to Review Complex Data Reduce Error –Canned Queries Assure Desired Result –Two Analysts Will Arrive At Same Conclusion “Nest” Queries –Allows User to Sequence Multiple Queries for Complex Analysis 1.Pedestrian 2.+ Bicycle 3.Night 4.Fatal or Severe Injury
Select a Standard Query
Defines Query
Nest Query
Select “or” Query
Add Bicycle Crashes to Selection
Defines Query
Select “and” Query
Automatic Population of ‘Drop-Down’
Select Fatal Crashes From Selection
Convert Query Results to Map ‘Theme’
Review Summary Data for a Specific Event Retrieve Scanned Crash Report
Spatial Selection/Data Association Select Crashes Manually Using Built-in Tool Use ‘Overlay’ Capability to Select Crashes –Proximity to Schools –Specific Neighborhoods/Planning Areas Correlate Spatial Attributes with Crash Data –Vehicle per Household vs. Bike/Ped Crashes –Roadway Classification
Common DBFVI File Format Opens Easily in Excel or MS-Access Macros or VBA Allow Quick Chart and Report Production –Frequency by Attribute Charts Supply Data to Clients in Common Format
Compare Corridor to State/County
Compare Intersection to Corridor/State
Contact Info: Demian Miller Tindale Oliver & Assoc. Tampa, FL