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Point Problems

11 REPLIES 11
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Message 1 of 12
allysonduncan88
493 Views, 11 Replies

Point Problems

Hi,

 

I am hoping someone can help me. I have a surface imported from datadoors (an .asc file added to a surface as a DEM file). I set the drawing settings and the file settings to the correct coordinate system. The surface imported correctly.

 

I need to add some survey data to this file (survey data was taken by a land surveyor). I import the .txt file and the files plot completely out of scale and they do not plot in the correct place. HELP! I have searched forums, blogs, everywhere. What am I doing wrong?

 

I have attached two images so you can see what I am talking about.

 

Thanks for any advice in advance!

11 REPLIES 11
Message 2 of 12

Have you tried using a different point file format?  Sometimes the ASCII file can be PENZD instead of PNEZD.



Todd Rogers
BIM Manager
Blog | Twitter | LinkedIn

Message 3 of 12

I did try that, it didn't help 😕 Sent from my iPhone
Message 4 of 12
sjg
Advisor
in reply to: allysonduncan88

Are you sure the survey work was done in a coordinate system or did they use an arbitrary system (5000, 5000)?
Steve Goessling
Land Consultants
Civil3D 2015
Windows 7, 64 bit
Intel i7 2600 @ 3.40Ghz
16 GB RAM
Nvidia Quadro 600
Message 5 of 12

Did the Survey points just plot out of place or where they truly out of scale? If they were out of scale that may mean that the surface is in metric and the points are in imperial of visa-versa.

 

Allen



Allen Jessup
Engineering Specialist / CAD Manager

Message 6 of 12

They were out of place and out of scale. The plotted points were bigger than my entire surface.
 

If this is the case, how would I go about converting the point data into US feet (the drawing is already in US feet?) The survey company is ZERO help.

 

Thanks!

 

Message 7 of 12
allysonduncan88
in reply to: sjg

Here is an example of a few of the point files that were given to me...

 

1000,-36.224,11920.057,12314.243,TOP PIPE END
1001,119.398,11880.410,12316.470,TOP PIPE END
1002,194.214,11859.853,12311.749,TOP PIPE
1003,230.860,11848.459,12310.418,TOP PIPE
1004,270.701,11832.433,12308.848,TOP PIPE

Message 8 of 12

Isn't that Lat and Long coordinates?



Todd Rogers
BIM Manager
Blog | Twitter | LinkedIn

Message 9 of 12
Jeff_M
in reply to: allysonduncan88

Or possibly PZNED?

Jeff_M, also a frequent Swamper
EESignature
Message 10 of 12
ToddRogers-WPM
in reply to: Jeff_M

HaHa, good catch Jeff!!



Todd Rogers
BIM Manager
Blog | Twitter | LinkedIn

Message 11 of 12

Well it certainly doesn't look like any defined coordinate system unless, maybe, it's truncated.

 

If we use Jeff's supposition that it's a PZNED or possible a PZEND then it looks like it's based on a local grid started at 10,000 by 10,000 and probably a Z of 100. The Z of 100 might explain the negative value in the second column.

 

If this is the case and you don't have equivalent points in the surface AND the Survey firm refuses to help then you need to hire another survey firm or pay the first one to get this in to the system you need. If you spece'd that the survey work was to be in a certain coordinate system then that's what you should have gotten. If a specific coordinate system wasn't specified then there's not much you can do about it without spending more money.

 

The only hope would be if you had equivalent locations in the Surface that you could use for a move, scale, rotate. Then you might get something close enough to work with.

 

Allen



Allen Jessup
Engineering Specialist / CAD Manager

Message 12 of 12

If you drawing settings are correct and you imprted the point file in the correct format I would suggest bringing in a google image or surface and see where it falls as a referance. Hopefully 1 set of your data will line up with the google data.

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