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GDOT - Custom Filters

This article summarizes the custom filters available in the Georgia Department of Transportation instance.

Lauren Miller avatar
Written by Lauren Miller
Updated over a week ago

Find the custom filters available in GDOT summarized here.

Census Filters

Available in all applications.

The census filters are built from census data and allow users to filter crashes based on various census criteria. The following outlines the logic of each filter.

  • Employment (Census) - This filter displays crashes that occurred in a census tract with the indicated number of occupation categories.

  • Median Household Income (Census) - This filter displays crashes in census tracts with the indicated median household income.

  • Median Household Income Group (Census) - This filter allows users to group median household incomes based on natural breaks, which are classes based on natural groupings inherent in data. The natural breaks for the Median Household Income Group (Census) filter are:

    • 0 - No median household income

    • 1 - $2500 to $14514

    • 2 - $14764 to $37054

    • 3 - $37136 to $53097

    • 4 - $53125 to $68207

    • 5 - $68497 to $84453

    • 6 - $84583 to $103345

    • 7 - $103487 to $127109

    • 8 - $127431 to $157784

    • 9 - $157986 to $195380

    • 10 - $196923 to $249028

  • Population Per Square Mile (Census) - This filter displays crashes that took place in census tracts with the indicated population per square mile.

  • Population Per Square Mile Group (Census) - This filter allows users to group population per square mile census tracts based on natural breaks, which are classes based on natural groupings inherent in data. The natural breaks for the Population Per Square Mile (Census) filter are:

    • 0: No population per square mile reported

    • 1: 1 - 724

    • 2: 725 - 1780

    • 3: 1781 - 3002

    • 4: 3003 - 4619

    • 5: 4620 - 6892

    • 6: 6893 - 10168

    • 7: 10169 - 14907

    • 8: 14908 - 23711

    • 9: 23712 - 51464

    • 10: 51465 - 102633

Inventory Route Number Filter

Available in all applications.

This filter combines the route number and route suffix to create the inventory route number, enabling users to filter crashes along a single corridor.

Land Cover Filter

Available in all applications.

The Land Cover filter lets users filter and view land cover classification information for specific roadways and crashes. This data allows users to apply context classifications to their analysis. For example, instead of simply querying “rural” area crashes, users can now search for Rural Built Area crashes.

The Land Cover filter is based on 2023 ESRI Land Cover data, which classifies the developed status of land. The ESRI data used to create this filter categorizes land classifications in 10-meter sections. The classifications available for each section are:

  • Built area

  • Trees

  • Rangeland

  • Crops

  • Water

  • Flooded vegetation

  • Bare ground

More information about these ESRI class definitions and land cover data can be found here. The land cover classification for the midpoint of a segment applies to the entire segment.

(Disclaimer: The roads displayed in the graphic above are used as examples and may not represent the actual Land Cover filter values. )

Note: Divided roadways may have different land cover results. For example, a northbound segment could have a different land classification than the opposing southbound segment.

(Disclaimer: The roads displayed in the graphic above are used as examples and may not represent the actual Land Cover filter values.)

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