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Overlaying event layers

Analyzing advanced linear referencing system (ALRS) event layers through spatial overlay is performed the same way you would with any other feature layers. Although the business data is stored in tabular form, when they are registered as event layers with the ALRS, they behave just like feature classes in most geoprocessing tools. This allows you to do things like determine the number of non-freeways in your state that have a surface course made up of Portland cement concrete (PCC), which is a rigid surface type, rather than a flexible surface type such as hot mixed asphalt (HMA). Overlay analysis such as this is useful for helping highway departments obtain a better understanding of their highways.

  1. Start ArcMap.
  2. Add pavement and functional class event layers to your map.
  3. Set a definition query for your pavement type equal to PCC.
    Pavement type set to PCC
  4. Set a definition query for your functional class not equal to freeway.
    Function class set to not equal freeway
  5. Open the Search window by clicking the Windows menu in ArcMap.
    Search window
  6. Type Intersect in the Search text box and press ENTER.

    The list displays all items that include the term "intersect".

    Results for search on "intersect"
  7. Click Intersect (Analysis) to open the Intersect geoprocessing dialog box.
    Intersect features dialog box
  8. Drag and drop PavementType and FunctionalClass from the ArcMap table of contents (TOC) into the Features list.
  9. Specify a path to write the output and give it a meaningful name.
    Intersect dialog box populated with PavementType and FunctionalClass event layers
  10. Click OK.

    A new feature class is created with records that show where the pavement type is equal to PCC and the road is not a freeway.

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