GEOG 497
3D Modeling and Virtual Reality

1.2 Adding Flood Map Layer and Understanding the Attributes

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1.2 Adding Flood Map Layer and Understanding the Attributes

  1. Click the Map tab to return to your 2D map.
  2. Turn off Smoothed_DEM.
  3. Turn on UP_BUILDINGS.
  4. Click add data. and from Lesson6.gdb, add FLD_HAZ_FEMA layer. Make sure it is located below UP_BUILDINGS in the Contents Pane.

  5. Click to modify symbology. Under the Appearance tab, select Symbology and choose Unique Values.

    Screenshot of appearance, symbology menu, with unique values selected.
    Credit: ArcGIS, 2021

  6. As you have learned in previous lessons, symbolize your layers based on FLD_ZONE to have good visualization of various values. Remove the outline for values.

    Screenshot of unique values
    Credit: 2019 ArcGIS

  7. Zoom to UP_BUILDING layer. You should have a clear visualization of floodways with different categories.

    Screenshot of campus map showing various floodways.
    Credit: ChoroPhronesis Lab

Based on FEMA’s information3, categories A, AE, and AO are all 1-percent-annual-chance flood. A is determined using approximate methodologies. AE is created based on detailed methods. Finally, AO represents shallow flooding where average flood depths are between 1 to 3 feet. X represent areas that are not in a floodway. For this study, you are going to consider all three A, AE, and AO layers as one floodway category.