Projection file

Chris Goodell,. Grady Hillhouse,. Practical Engineering,. The RAS Solution,. RAS Mapper,. RAS Results,. RASter Calculator,. Visual Basic,. Example Projects,. File Management,. Comments Anonymous on May 14, I saw your post on projections on your blog and thought it might be good to mention that you can convert the coordinate system of the model in HEC-RAS now.

Chris Goodell on May 14, Thanks. Good point. Chris Goodell on May 15, Thanks for the head's up. Best Regards! You have to solve a background using static image georeferenced image I hope, that I write it well, Chris! Chris Goodell on June 3, Gerrit- thanks for the information.

Mike on March 15, Hi Chris, thanks for this post. Chris Goodell on March 29, It sounds like errors in the geometry setup.

Should have nothing to do with the projection. Chris Goodell on October 6, 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: Ben Snyder on May 9, I've been trying to resolve a mysterious horizontal datum shift that RAS does for quite some time. Ben Snyder on May 9, Actually, that worked! Anonymous on July 22, Hello, I need your help. But make sure to double check. West on June 11, Hi Chris, You talked about unit in this post.

Better to start the project in your preferred units, if possible. November 4, October 7, October 4, As such, ProjFS doesn't provide: mechanisms for reporting progress of data recall; indication of the online versus offline state of a file; nor other features that may be desirable when working with backing data stores that are slow. Skip to main content. This browser is no longer supported. Download Microsoft Edge More info. Contents Exit focus mode. I saw that mine included a vertical datum clause.

I removed this entire part of the projection file and it worked. But before it worked, I encountered another hitch. It's in that dialog "Spatial Reference Projection File. In other words, it doesn't refresh. I had to select a different projection file, choose OK, then go back and choose my edited projection file, and choose OK.

For many minutes I was mystified why my edits to the file were not taking. I was making edits to the projection file in a text editor, then switching over to RAS Mapper and attempting to have it read the file again.

So if you get this error message even though you think you're giving RAS Mapper a valid projection file, try what I did. This is good information Dudley, so I'm copying this up to the post itself. Pages Blog Forum Book. Thursday, May 14, The Projection File. Written by Christopher Goodell, P. All rights reserved. The projection file requires us to know something about geospatial mapping i. But if you wish to use RAS Mapper, and you will , you need to understand what the projection file is and how to get one.

Without it, RAS Mapper is pretty much useless. The projection file is really just a simple text file with keywords in a specific format. Notice that there are some keywords, identified by all CAPS, followed by some data related to the key-word, contained in brackets [ ].

I've color-coded it to make it easier to see what goes with what. The purple color denotes the highest order in the hierarchy, followed by blue, then green, then red. The projected coordinate system is made up of the following sub-clauses: 1. This is essentially how the three-dimensional spheroid Earth is projected to a two-dimensional viewing medium. Posted by Chris G.

Anonymous May 14, at PM. 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.