How to Put an Autocad Drawing on State Plane
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Shared Coordinates and Civil State Plane Coordinates
Understanding shared coordinates tin can experience like trying to find and unlock the "Dark Spider web." You might be better if you lot simply didn't try. Unfortunately, some of us are forced to deal with things nosotros don't understand. In this article, I will break it downwardly for you equally simply as I can. Nosotros'll too get over the utilize of shared coordinates with a CAD civil file with Land Plane Coordinates—another "black magic" practice—although the two don't always work well together.
Let's first first to sympathize what shared coordinates do for Autodesk® Revit® users and their projects. Shared coordinates are a coordinate system yous establish specific to your project and can be communicated by acquiring or publishing to or from a linked model. Sounds simple plenty, right?
Okay, then what are State Plane Coordinates? The U.S. Geological Survey defines the Land Plane Coordinate System (SPC or SPCS) equally "a aeroplane coordinate organisation (N-S and E-West lines are perpendicular) in which each individual country has from one to six zones, depending on the land's size and shape."[ane] In other words, State Plane Coordinates are defined points on ane of more than 100 Cartesian grids that each overlay all or part of a U.S. land. When you lot get a SPC civil CAD file (such as a site plan) from the surveyor or civil engineer, open the file and perform a "Zoom Extents" control. You will commonly find that there is some minuscule point or marker mode off in the distance that makes your site actually small. This point is most likely the geo-reference betoken, and information technology will be in a different location in relation to your site on each project. The point volition normally exist located at the origin signal or 0,0,0 of the drawing.
Our site is located in the square on the peak right of the diagram. The site is the unabridged aerodrome holding of approximately iii,300 acres.
The origin point of the drawing is located in the circle at the lesser left of the drawing, also known as 0,0,0.
We know that Revit does non like site files or models larger than 20 square miles. You will more than likely meet this error, and we will hash out this workflow later in this article.
Now, we go to the nitty gritty: Revit's shared coordinates. Due to the size and complexity of the work on my last project, using shared coordinates made the most sense. This was a large-scale aviation project in Tampa, Florida, with 18 different consultant firms and 135 Revit models (10GB of data) exchanged weekly amid the squad. I starting time created an architectural site model and linked in a site plan provided by the aerodrome. This file was not geo-located, so information technology was a perfect kickoff for locating our projection using shared coordinates. In this case, we located some of the airport command monuments and designated one of them our shared coordinate point. We besides located a second monument and used it equally a secondary control point to make certain we had everything dialed in. The command monuments had northing and easting values, which we used to actually locate our project in Revit.
The control monuments can exist institute on the Airport Control Survey. We located this data in the CAD survey and linked it into our site model.
This is the site model with the CAD site linked into it showing our command monument. We volition place our survey betoken on top of the monument.
To clarify, we are setting up our shared coordinates in our ArchSite.rvt model and "sharing" them with the other models. Our project has vii different buildings or structures on ane large shared site, and so we used the same shared coordinate point for every building, although we could take used a dissimilar bespeak with each edifice. Nosotros felt that 1 mutual coordinate point would be much easier than vii. At present, dorsum to our procedure. We take linked in our site plan and found a reference point (airport command monument). Next, nosotros volition place the survey point on our control monument, assign the northing and easting information, and relieve the location. This volition institute our shared coordinates. Information technology is also important to salve the location or position of the site. We are really saving the position of the building fifty-fifty though we have non yet placed our edifice model on our site.
You lot volition have to unclip the Survey Betoken in society to record the coordinates.
The survey point has been placed on top of our command monument, and nosotros have assigned the northing and easting values and elevation to it.
At this time you volition also want to place the project base point. The project base bespeak sets the origin of the model and preserves the position of the building on the site, whereas the survey point locates the projection within the physical earth. I recommend that you designate a mutual reference point for the project base of operations point as well.
The side by side ii diagrams testify the location of the site on the map and the saved location or position.
Allow the Sharing Begin
Allow's assume you already accept a edifice model developed and y'all are fix to place it on the site. Link your building model into your ArchSite.rvt model and locate it in the desired location. Be sure to also locate it in the Z axis too. I use Transmission Center to place my building and and then rotate or position as needed. Once this has been completed, yous can now share your coordinates. Select your building model from any view and look at the Properties dialog.
You will come across a button in the backdrop dialog side by side to Shared Site that says <Not Shared>. This is one of the places Revit displays the shared position of the project. To share the coordinates to the linked model, you lot volition select the Coordinates pull-down, then Publish Coordinates, which can be constitute on the Manage tab.
The Location Weather and Site dialog will pop upwardly. It will brandish the current position of the linked project, which will be Internal. I like to rename the internal position to identify that I have designated shared position or coordinates for the linked model. In one case yous synchronize your project, a dialog will pop upwardly and inquire you lot to practise one of iii things. In our example, nosotros will select the offset option, Save. As the option text states, this saves the position dorsum to the linked file. To ostend the coordinates saved back to my linked file, I commonly select the linked file and look at the Backdrop dialog next to Shared Site to make certain it displays the proper noun of my shared position. We can also open the linked model, go to the Manage tab, and select the Location button and then the Site tab, which will display the projection position.
These steps should be performed for each linked model.
When I create my BIM project execution plan, I typically include some instructions and crave that my consulting engineers use my Revit site model to ready their shared coordinates. Before taking this footstep, double check that your shared coordinates are correct and everything is fix exactly the way y'all want.
State Plane Coordinates
If you only need to practice shared coordinates and have no need to work with State Plane Coordinates, your work here is washed. If you do need Country Aeroplane Coordinates or are just sick and desire to continue reading, then by all means let's continue.
Every bit I mentioned before, my firm recently used State Plane Coordinates to coordinate with our ceremonious team when we exported our Revit models for a projection that contains a 1.four mile-long elevated train structure with four train stations. Making sure it all fit and was in the correct place was important, to say the least.
This is the MasterSite.dwg file that is linked into Revit. It is inside Revit's 20 mile limit. The origin bespeak marked with the X.Y is located at 0,0,0.
In your Revit models, locate the Survey Point and marking it with an annotation symbol that will export with the model and show up in the CAD file. This will act equally a reference indicate to aid you position everything in the correct place. Next, plough on all the layers in the CAD file that you exported from Revit and movement everything until the exported survey point is placed at 0,0,0.
You will need a similar workflow for the other ceremonious files that will be included in your Site Model. In your ceremonious file, draw a circle and enter for the x and y coordinates your northing and easting values that stand for to the shared coordinate survey point. Now, turn on all the layers and movement all the CAD data then that your circle or reference point is placed at 0,0,0.
The circle on the far left is our reference point. It is located at 0,0,0 in our CAD file and corresponds to our shared coordinate signal or survey signal.
Once all these files are right, link them into your master site and place the circle or reference point on your located CAD survey indicate. You still need to brand your MasterSite.dwg file geographically correct, so link it into your geo-located survey and share it with your civil team.
The diagram below shows the workflow and file associations for Revit and CAD files that pertain to the shared coordinates and State Plane Coordinates workflows.
Using shared coordinates and Land Aeroplane Coordinates will help your team proceed things consistent with common reference points. Don't forget to check these reference points from time to time to make sure no one has moved them. Autodesk has given u.s.a. these tools to help plant and locate our projects inside the physical world. If that doesn't piece of work you can always endeavor blackness magic or consult the Night Web.
[1] http://www.usgs.gov/faq/categories/9794/3025
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