RBH-Aimee

Adding footprint to imported DWG survey data

Recommended Posts

Have imported a DWG file using a special unit conversion of 1:20 which is the scale of the survey.  However, the footprint of the floor plan comes through as the original 1/4":1' scale so it is tiny on the plot plan.  Please advise how to change the scale of the residence/footprint. Perhaps I need to reverse the unit conversion to shrink the survey?

 

Attached is the plan.  I'm using Chief Architect Premier x10.  I'm a new user who has tried to follow training videos to the best of my ability.  Would appreciate some advice on how to resolve this issue of different scales. 

 

Plans_29_August_2018_with_plot_plan_draft.plan

Share this post


Link to post
Share on other sites

not sure but you might want to try to bring it in just in ft and inches since the program deals with ft and inch then when you send it to a layout page scale it to the 1=20 scale, since I don't have your survey to import I can only give it a guess

Share this post


Link to post
Share on other sites

I'm having the exact same issue with a .DWG survey that is scaled at 1"=40'.  I created a custom unit conversion to that scaling, and upon import there is no difference.  I opened a ticket with support today.  I also tried the reverse where kept the multiplier at 40, but instead of selecting ft, I selected inches.  No difference.

Share this post


Link to post
Share on other sites

If you post the DWG file someone may be able to take a look and provide some suggestions.

 

I would not suggest messing with unit conversions.  Most North American surveys seem to import in ft unless it is clear they are metric and they may still import in ft.   Bring the survey in and measure a known distance an use transform and replicate to correct the scale.

Share this post


Link to post
Share on other sites

I would import it in feet to the plan. When you send it to layout, send it at whatever scale works for the paper size you're using.

Share this post


Link to post
Share on other sites

I'm having the exact same issue with a .DWG survey that is scaled at 1"=40'. 

 

Tommy is correct. Survey data isn't scaled. Just like your house plan, it's drawn in "real world" units. When importing a dwg the critical factor is: "what units were used to create the data?" It's likely that a survey uses decimal feet, so when you import you would choose this setting:

import.thumb.PNG.c55016128a44e08b8a92eff7680014fb.PNG

 

There shouldn't be any need to set up a custom unit conversion.

  • Upvote 1

Share this post


Link to post
Share on other sites

The general rule for me is all surveys should be imported in decimal feet. All dwgs of a plan from an Architect or any one using Autocad or similar should be imported in inches. This however may vary depending on the country you're in. 

Share this post


Link to post
Share on other sites
11 hours ago, rlackore said:

Tommy is correct. Survey data isn't scaled. Just like your house plan, it's drawn in "real world" units.

 

That is definitely how it should be but I recently got one from a surveyor that was scaled and when I asked about it they said they have always done it that way.

 

Share this post


Link to post
Share on other sites
22 minutes ago, Chopsaw said:

 

That is definitely how it should be but I recently got one from a surveyor that was scaled and when I asked about it they said they have always done it that way.

 

 

Agreed.  That's how it SHOULD be, but not all surveyors are great surveyors, not all of their helpers are great helpers, and they may or may not be the best draftsmen either. 

Share this post


Link to post
Share on other sites
2 hours ago, Alaskan_Son said:

 

Agreed.  That's how it SHOULD be, but not all surveyors are great surveyors, not all of their helpers are great helpers, and they may or may not be the best draftsmen either. 

Boy is that ever an understatement! I have found over the years that 40 to 60% of the surveys I get are not correct. Two months ago I had it out with a client who just had a survey done that cost him $950.00 and I told him that survey was way off by as much as 4' in two areas which was where we were doing the remodel. He said that couldn't be for they had a very good reputation. I finally had to meet the client out there and physically show him where it was off. He was shocked and couldn't believe it. I told him to have them do the survey again because if I found two places off that much that I didn't trust the supplied  survey. They finally gout it right. I played hell initially on that job trying to get my initial dimensions of the as-built to come close to matching the survey. I find that most surveys can be off by 3 to 5 inches. There have been times when a survey has been bad and the client got a different survey company to do another one and have found that the differences from the house to the property lines were different. So now which one do you trust? I helped one person in California years ago who had a dwg of the property and I couldn't make it work. Come to find out that the survey company told us that there was a typo on the bearing distance and would correct it. Anyway, I take all surveys with a grain of salt but it's the only legal document I can use to create a site plan. It's amazing what they can get away with.

Share this post


Link to post
Share on other sites
9 hours ago, tommy1 said:

I have found over the years that 40 to 60% of the surveys I get are not correct. ... I take all surveys with a grain of salt but it's the only legal document I can use to create a site plan.

 

Sometimes I run into bad surveys. On commercial work it's rarely an issue because the surveys are done by large civil engineering firms. Residential can be more troublesome, which is why we usually recommend a surveyor we know and trust, or hire the surveyor ourselves and bill the client.

Share this post


Link to post
Share on other sites

I just had a problem with a surveyor on a residential addition project. The lot was sloped in several directions. We ordered a topo and boundary survey.

We were taking down a large carport on the side of the house and building a two story addition in its place. When I got the survey they showed that at two of the posts

holding up the carport were each in there own 6' deep holes. This was not correct. The posts were at grade, not in a 6' deep hole. The surveyor also showed contour

line under the existing house, again showing that there was an 8' deep hole under the house. I asked the surveyor how he was able to survey under the house. He had

no answer. He had to redo the survey.

 

Share this post


Link to post
Share on other sites

Please sign in to comment

You will be able to leave a comment after signing in



Sign In Now

  • Member Statistics

    29108
    Total Members
    9156
    Most Online
    melanieobriendes
    Newest Member
    melanieobriendes
    Joined