The SWITRS GIS Map offers an interactive map-centric approach to viewing and querying SWITRS collision data. To use this tool, click on SWITRS GIS Map (new) from the Tools dropdown menu. This user guide provides instructions on how to use the tool's many different functions.
Web Browser Compatibility
The SWITRS GIS Map is designed to run in many different web browsers. For optimal viewing experience and full functionality, we recommend the latest versions of Internet Explorer, Mozilla Firefox, or Google Chrome.
The Map SWITRS panel, tools, map contents, basemaps, and location search bar are located in the horizontal bar across the top of the map. All the functions to query SWITRS can be found by clicking Map SWITRS.
The navigation toolbar is located towards the top left. It provides several options for navigating the map.
The Map is the main component of the application; it is where collisions and other data layers are displayed. Other windows can be minimized to maximize the map extent.
The results window is shown hovering over the map in the top right. After showing collisions on the map it will automatically expand to summarize the results and give several options to interact with the data. It will also notify users when the collision display limit has been exceeded.
1. Toolbar - Map SWITRS
The core functionality of the SWITRS GIS Map is the ability to query and dynamically map the collision data. Many options are available in the Map SWITRS panel.
Date and Location Parameters
Users must first establish a time frame and county/city location. The To and From dates can be selected from a calendar or typed into the Date box. The ten most current years of data are available to query. Note that the most current year available may be a provisional set and only a portion of the final collision records that will eventually be available. Please refer to the FAQs for more information.
Select Collision/Party/Victim Factors
Next, users have the ability to select specific types of collisions based on collision, party or victim specific factors. For example, pedestrian collisions involving older adults could be specified by choosing Pedestrian Collision > Yes in the collision factors and specifying in the victim factors, Victim Age > 65 to 125. Factors that have been selected will appear in the middle of the screen. When a filter is hovered over, an x button will appear which will delete that specific filter when pressed.
Refer to the codebook for more information regarding the fields. Only the most commonly used fields are available to query by in the SWITRS GIS Map tool. The Resources page also gives you more information about Working with the relational database structure that SWITRS data is organized in.
Select State Highway
(and by default, ALL state highways and ALL directions) will show only collisions associated with the state highway. You can also select a specific state route number and its direction. Otherwise, all state routes in the county/city will be included. Choosing None will only show collisions not associated with the state highway system.
Identify Collisions/Collision Details
Once the collisions are displayed on the map, you can click on them to get more details. A pop-up will show details about the collision and location. If more than one collision is in the same location, you will see x of total number of collisions in the bottom right of the dialog. To navigate through the different collisions, click on the small arrows. There are also two options across the bottom of the pop-up.
- Zoom to: Zooms your map closer into that collision on the map.
- Collision Details: Opens a new page with a small map, the basic details, and a Google Street View; this page provides an easily printable 1 page summary of the crash.
Other toolbar features
The SWITRS GIS Tools can be accessed from the toolbar across the top of the map.
One of the most powerful features of SWITRS GIS Map is the ability to Select Collisions of interest in a region, corridor or intersection. After selecting the collisions, you can review the statistics, create a collision diagram, or download the complete data files to conduct further analyses. There are three different ways to select collisions.
The drawing tool allows you to draw a shape around the collisions that you want to select. Choose either the Point, Multi-Points, Polyline, Rect, Polygon, or Free Hand tool. Click your mouse to draw around the collisions and let go to complete your selection.
The Select by Buffer tools can give more precise measurements. For example, you may want to select collisions within 25 feet of a corridor (left), or 75 feet of multiple intersections (right).
- Enter a buffer distance.
- Choose a shape. Hovering over a shape button provides a description (e.g. Point, Multiple Points, Line, etc.).
- Follow the on-screen instructions on the map.
Create Collision Diagram
Once you have spatially selected a subset of collisions, the Results box will show the option to Create Collision Diagram. This option will open a new browser window that attempts to show all the collisions with appropriate movement and collision type symbols in an interactive Google maps style. The user can then generate a single page diagram summary for printing. For more information on using the collision diagram tool, please refer to the separate help document Collision Diagram Tool User Guide.
The Download Collisions tool shows a pop-up window with several options.
First, users should choose the extent of interest: All Mapped Collisions or Selected Collisions (disabled if no collisions are selected).
Next, the type of data file should be chosen: Collisions, Parties, or Victims. Typically, the collisions file will be of interest but you may also be interested in the Parties and/or Victims file.
Note: Collisions, parties, and victims are related to each other hierarchically, with collisions being the parent or top entity. This means that collisions are first narrowed down by selected collision factors, next by party factors, and then finally by victim factors. For more information, go to the SWITRS Help page> Working with the relational database structure.
Rank by Intersection
Use the Rank by Intersection tool to rank major intersections by total collision count.
After selecting Rank by Intersection from the Tools menu, select the distance that you want collisions to be included in an intersection's collision count. For each intersection, the higher its rank, the more collisions occurred within it.
Once you have selected a distance and pressed calculate, the top 10 intersections will be displayed.
Note: Only collisions that match your selected date, location, and other factors are used. Additionally, this tool only ranks collision counts for intersections in which one of the intersection's roads is a primary road or secondary road. Primary and secondary roads are any of the 10 types of roads listed in the A2 and A3 series. For more info, see this list of Census Feature Class Codes.
Select the Collision Summary tool from the tools dropdown to view an in-depth summary of the mapped collisions. Users can choose to sort the collision counts by collision factors, injury trends, or killed/injured victim.
When collision factors is selected, users can sort by 3 different variable types: Collision Variable, Party Variable, or Victime Variable. Then, users can choose various subtypes based on the collision variable selected. The hamburger icon on the right allows users to print or download the chart.
The injury trends option displays the number of collision counts per month and year.
Killed/Injured Victim Summary
The killed/injured victims option sorts the collision counts by gender.
There are several different ways to symbolize collisions. Display options can be changed by clicking Options in the toolbar. A pop-up will then appear on the left side of the screen
You can change the size of the symbols and choose to display the collisions as symbols stratified by Collision Severity, Type of Collision, or Motor Vehicle Involved With. After selecting a type of stratification, you can then choose to turn on/off colors for each value.
Layers refer to the different layers that can be displayed on the map and is accessible from the main toolbar. Users can select from several standard layers or import one of their own point layers.
Switch to a basemap by clicking it from the Basemap dropdown menu. A basemap presents background referential information such as roads, landmarks, political boundaries, and landforms. The default basemap in the SWITRS GIS Map is Streets. Vector Basemaps have the best performance on machines with newer hardware. Please disable the Use Vector Basemap option if your computer has performance issues. Vector Basemaps can be displayed in Chrome, Firefox, and Safari.
List of Basemaps
|Basemap||Description||Vector Basemap Available|
|Streets (Default)||Comprehensive map with street-level data. Depending on how zoomed in or out you are on the map, the basemap can include street names, water features, and other physical/political/economic points of interest such as parks, schools, and hospitals.||Yes|
|Satellite||High-resolution aerial imagery; no labels.||No|
|Hybrid||Same as Imagery, but includes labels of major streets, institutions, cities, and other points. Depending on how zoomed in or out you are on the map, the number and placement of labels that is displayed will vary.||No|
|National Geographic||Shaded relief map that uses National Geographic's cartographic and typographic design. This basemap shows administrative boundaries, protected areas, streets, railways, highways, water features, buildings, and landmarks.||No|
|Topographic||Detailed topographic map that shows and labels political boundaries, water features, parks, landmarks, buildings, transportation, and other features.||Yes|
|Light Gray||Minimalist map with light neutral colors and minimal labels for major streets and points of interest. This basemap is useful when you do not want detailed street information (as with Streets and OpenStreetMap) to be distracting.||Yes|
|Dark Gray||Minimalist map with dark neutral colors and minimal labels for major streets and points of interest. This basemap is useful when you do not want detailed street information (as with Streets and OpenStreetMap) to be distracting.||Yes|
|OpenStreetMap||Collaborative map that displays data collected via the OpenStreetsMap project. For some locations, this layer may be more updated than other street basemaps.||No|
|Streets Night||Detailed vector basemap that displays a custom "night time" street map style. When the Use Vector Basemap option is deselected, it becomes the dark gray basemap.||Yes|
|Streets Relief||Shaded relief map that shows highways, major roads, minor roads, railways, water features, cities, parks, landmarks, building footprints, and administrative boundaries. When the Use Vector Basemap option is deselected, it becomes the streets basemap.||Yes|
|Streets Navigation||Comprehensive map with a custom navigation map style that is designed for use during the day in mobile devices. When the Use Vector Basemap option is deselected, it becomes the streets basemap.||Yes|
Location Search Bar
To find a location on the map, enter an intersection or address, including the city and state into the Location Search Bar in right of the main toolbar; next, click the Search icon or hit enter on the keyboard, and the map will zoom to that location. If an exact location cannot be found, it will zoom to the nearest identifiable location such as the street or city.
A white triangle will point to the address or intersection, and a pop-up window will also display the address or location.
Pressing the icon towards the left of the toolbar will display a side menu that contains the same options.