Civil 3D 2013, SP1, Windows 7, 64-bit - I've got a user who imports points into the survey database and RANDOMLY the points will be shifted on average 27 feet in the northing and 4 feet in the easting. She notices this becuase she'll check a point and see tht the northing and easting varies from the grid northing and easting (I've attached an image to view) She will then discard the drawing and begin a new one only to import the data and now it imports correctly. The behavior is completely random and it's happening on multiple projects. All the projects begin with the same template. All the settings (drawing settings and survey settings) have been set to US Survey Foot. It's weird because once the issue is noticed it can be fixed by simply beginning another drawing and re-importing the data, but it has happened on projects where she's already got pre-existing data. Any ideas on what may be causing this?
Thanks in advance,
Sounds like you are importing them with International Feet when it should be US Survey Feet. Right-click on your survey database and select Edit Survey Database Settings. Change the International Feet to US Survey Feet. You will have to re-import the points after you fix this.
Yes, I would check the coordinate system. Here in Australia, we used to use AGD66, but now using MGA94. Coordinates in the old system are offset by approximately 150m, east and north. This used to cause all manner of confusion until people got used to it. I'm sure the same has happened just about everywhere over the world at one time or another.
I've verified all your suggestions in some of the past projects and current ones. All the settings are correct and in line with your suggestions. The weird thing. . .remember, this happens randomly. All the settings are the same throughout each project. So why does it randomly shift the coordinates? And why is it always the same (or similar) distances? Maybe it's something on our systems.
Thank you all for all your input.
I guess I'd start basic troubleshooting - is it only one file (or group of files?), is it only affecting one template? is it only one computer or all of them? etc. Is it only after a certain command (is it truely random)? Is the offset amount the same? what amount is it offset by (anything familiar?)? etc. etc. Is the offset permanent or does it fix itself later?
Are you able to post the file?
Interestingly, I had a similar issue occur on one drawing just today - I haven't had time to investigate yet, but I noticed that some drawn objects were offset in relation to the underlying Bing imagery. It might be the imagery georeferencing has been altered, or I accidently moved stuff, or maybe something more sinister like you're experiencing
I'll have to do some checking on my file.
If you insert a drawing with the shifted points in to a new one created from your template and reimport the points, overwriting the old ones. Does that bring the points in properly?
What is the original source of the points? Were they ever converted from LDT points?
Yes, I've started basic trouble shooting. Here are the answers to your questions. . .
I will try the suggestion of taking the shifted points and inserting them into a new one to see if that works. Now I just have to wait until the issue happens again. We're now logging events:
Thanks for all the input. If I find anything that resolves this I'll repost.
Good day to all,
Have you verified that he surveyors gathered the point coordinates on the same coordinate system? If they gathered them in one system and converted them to another, you could be getting some that are not on the same system.
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