Establish Coordinates: Acquire Coordinates from a CAD Link

I recently started a new project file at the office, and looking back over the archives, I figured it was a good time to revisit some of my workflows for file set up. At some point since I last posted about establishing coordinates, I discovered on Revit OpEd that you can actually acquire coordinates from a dwg file. Acquiring coordinates is by far the superior method for establishing coordinates. Not only is it more efficient but it is also more accurate and leaves less room for human error.

Steve’s post goes into some good detail about how to clean up your dwg file and also how you can link subsequent CAD files via Shared Coordinates once you establish coordinates. So I would definitely recommend reading his post, but if you are unfamiliar with either the Survey Point or Shared Coordinates, here is the step by step process. Continue reading

Map Existing Trees with Survey Data

If you have to model an existing landscape in Revit, Dynamo can be an excellent tool to automate that process. Not only can you quickly create existing hardscape (that follows Topo), but you can also automatically place and size existing trees using survey data.

In fact, you can use this process to automatically place any element that exists in your AutoCAD survey as a block.

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Specify Coordinates at Point

One of the interesting things about Revit is that you will frequently encounter various methods and workflows of accomplishing the same task. This is particularly true of Shared Coordinates. Since posting about the Survey Point in March, I have started to use a slightly different and potentially more efficient method of establishing coordinates. This is an update to the previous post.

Much of what I said previously, still applies:

“The world in Revit is entirely different than AutoCAD. It doesn’t like your project/project base point to be larger/outside 20 miles. Unlike in AutoCAD, your project should never be way off in space from the project base point (origin). […] Revit has two moveable points that control coordinates: project base point and survey point. […] The survey point is key; it has northing, easting, and elevation data that you can set, relating it back to the real world, and thus AutoCAD…”

If using a CAD survey, link in the survey and move the survey so that the Project Base Point is within the survey boundary. Often, it is a good idea to place the survey so that the Base Point is on a known project benchmark Continue reading