Jan Jan 10, — Feb 17, Mar 1. Mar 1, — Jun 1, We provide solutions in:. Seawater Intrusion Modeling. Karst Modeling. Hydrogeological Modeling. Jan 10, Aug 12, Aug 10, Aug 4, Jun 29, Mar 15, Feb 23, Dec 4, Online Course: Python for Hydrology. Jan 11, Dec 28, Let me know how it goes. Is the projection file only significant for RAS-Mapper, or geometry as well?
I inherited a RAS model that is supposed to be working, they even sent over final run results. I am not able to run it because of a geometry error — it seems some river reaches are not lined up correctly to their associated cross sections. Also some weirs fall below the terrain elevation. I believe these issues might be because of a lack of projection file. How do I change my projection file for the new project so it'll display the project in the right place? 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,. Selecting the wrong file will not mess up your model as RAS Mapper will only accept properly formatted projection file. Alternatively, you can obtain projection files from spatialreference. After searching for a specific projection file, you will end up on a screen that looks like the one below. To import a projection file, complete the following steps.
In addition, you should make sure that the projection file is consistent with the map projection associated with the cut lines defined in the geometric data editor. Paige is a California-based engineer who specializes in water resources projects. In her free time, Paige enjoys long-distance running and surfing.
If you are deciding whether you want to pursue a career in civil engineering, you are probably wondering whether civil engineers are paid well. Although one should consider a number of things such If you are reading this article, you may be considering agricultural engineering as your area of study.
If this is the case, this blog post will give you a more solid understanding of what life is Geographic Coordinate System A geographic coordinate system represents the Earth using a three-dimensional 3D spherical surface. Geographic coordinate systems are also called global or spherical coordinate systems. Projected Coordinate System In contrast to a geographic coordinate system, a projected coordinate system is based on a map projection.
Some of the most common types of map projects are discussed below. Equal Area Projections An equal area projection is designed to maintain the area of specific features. Conformal Projections Conformal projections maintain the shape of a small area. Equidistant Projections An equidistant projection maintains the scene along one or more lines. Azimuthal Projections Azimuthal projections plots preserve the direction from one point to all others. For this projection, each great circle is mapped to a straight line.
Seismologists frequently use this projection because seismic waves travel along circles. It is also a projection that is used for navigation.
0コメント