Or would it make more sense download a new projection file based on the unit conversion? And if so what would that new horizontal datum be? You'll have to get a new projection file or create your own that has the correct unit system. This is how the coordinates changed after the unit conversion at a specific point where a cross section intersects with the river reach:. Originally Meters: How should this be modified to make it so my project doesn't end up in the middle of the Arctic Ocean after the unit conversion?
I've been trying to resolve a mysterious horizontal datum shift that RAS does for quite some time. For my latest work-around test, I made a projection file for RAS that has the exact same projection data as the Civil 3D tif.
It says "Same As Project" when I make a new terrain. Then when I open the geometry editor and look at the coordinates of a landmark, it's off by about 12 feet in the easting direction and a few in the northing. I'm stumped! Any ideas? It's problematic because all the RAS results rasters are then shifted and don't line up.
Actually, that worked! But as long as they're exactly the same, they should be good to go. Hello, I need your help. Thank you very much. Aerial imagery lines up correctly. But, when the measure tool is used in RAS Mapper, it gives distances in feet but the measurement indicates it should be meters.
Will this model produce correct results or is the landscape through which the flow is routed basically shrunken by a factor of 3. Here is my case. We work with US partners in this watershed Souris River watershed. Then we use this model in Canada; however, we use SI in terms of flow, elevation, distance etc. Can I use this model by simply convert unit to SI, or this is not a correct way to use this model.
The correct way to use this model in Canada is to prepare input flow as English unit, run the model, and read results in whatever units we select. I think this thought makes sense, and confirmed with experts in CivilGEO. But Chris I still like to know your thought. Hi West. In theory, you can just convert your model to a different unit system by using the Convert Project Units option from the main RAS window.
However, I would be very cautious when doing this, because RAS has been known to have some errors in this conversion utility. At the very least, you need to check everything after the conversion to verify that it was done correctly. Your email address will not be published. Save my name, email, and website in this browser for the next time I comment. Ben Cary,. Chris Goodell,. Grady Hillhouse,. Practical Engineering,. The RAS Solution,. RAS Mapper,. RAS Results,. RASter Calculator,. This creates the Coordinate Systems folder in the default location.
Select the desired projection from the drop-down or search for it in the search bar. Right-click and select Add To Favorites. This saves the desired projection as a. Navigate to the Coordinate Systems folder at the following default location. How can we make this better? Please provide as much detail as possible. Contact our Support Team. Request Case Start Chat. Translation Feedback How can we make this translation better? Get notified about latest updates to this technical article?
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