![]() ![]() 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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