This is a .NET threading error. Ensure your map is in Layout View , not Data View, before writing the geometry. The final patch for ArcGIS 10.8 partially mitigates this.
If you are running (including 10.8.1 and 10.8.2), you might have noticed that finding, installing, and running HEC-GeoRAS can be challenging. Because Esri shifted focus to ArcGIS Pro, software updates for legacy ArcMap tools require specific workarounds.
You should use the specific setup package for your version, such as HEC-GeoRAS 10.8.0.3 for ArcGIS 10.8.0/1. hec georas for arcgis 108 upd
Right-click the downloaded HEC-GeoRAS 10.8 installer and select .
The typical HEC-GeoRAS workflow involves translating raster/vector terrain data into a RAS GIS Import File ( coordinates, elevations). 1. Pre-processing (Building Geometry) This is a
The USACE never released a version of HEC-GeoRAS explicitly labeled for ArcGIS 10.8.
Below is a proposal for a new feature development titled designed to modernize the HEC-GeoRAS workflow within the ArcGIS 10.8 environment. If you are running (including 10
Developed by the U.S. Army Corps of Engineers Hydrologic Engineering Center (HEC), HEC-GeoRAS is an extension for ArcMap designed to bridge the gap between Geographic Information Systems (GIS) and hydraulic modeling. Pre-Processing Capabilities