![]() Convert the site topography to a surface.(I’m hoping to get a tutorial up on navigating that site soon.) The Geospatial Data Gateway from USDA also provides some topographic data. You might have a survey that covers the extent of your site – that’s ideal. If this is for a study that’s going to be run through FEMA it’s really important to incorporate DFIRM data into your model. DFIRM (Digital Flood Insurance Rate Map) from FEMA if available.Reverse cross-section stationing in Geometry Editor using GIS Tools.Make sure the alignment and sample lines are within the bounds of the surface. ![]() Create sample lines along the alignment to turn into the cross sections.Create an alignment representing the stream centerline (from downstream to upstream).Get DFIRM data and site topo into a CAD file.
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