Automatic identification of ditches and streams in elevation data using raster algorithms, Jacob

Hydrological flow models are today commonly made using surface elevation sourced from LIDAR data. One big problem with this elevation data when calculating water flow is that culverts aren't represented and therefore the elevation data needs to be modified. Culverts have to be identified, digitised and "burned" into the elevation raster. Culverts are usually found along ditches and streams and these can to some degree be identified visually in the elevation raster using hillside symbology. However, if ditches and streams could be automatically identified the process of finding culverts would be easier. This presentation shows how to automatically identify ditches and streams of certain sizes and shapes using raster calculations with slope, aspect and neighbourhood analysis. The resulting raster features are then converted to polylines for further workflows to find and digitise culverts.

[davidedimauro]

This is great!
What is the name of the plugin on the repository?
thanks!!

[Hannesorama]

This is really helpful - great job Jacob!
Are the model schema available yet?