AutoCAD Map 3D General Discussion

AutoCAD Map 3D General Discussion

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Contributor
COLINBIBLE4464
Posts: 16
Registered: ‎04-15-2010
Message 1 of 5 (286 Views)

using expression builder to list the distance between points

286 Views, 4 Replies
05-03-2012 04:57 PM

Hello. I have a data table showing points surrounding a central source.

I would like to create a calculation that adds a column in my data table of the points; that shows the distance between each respective point, and the central point.

My knowledge in expression building is limited, and Im hoping someone here could help me.

I assume I would be using some form of calculation using the geom, and the X and Y locations, however Im coming up with nada.

Can anyone help?

 

Thanking you in advance

 

Colin

Mentor
tjmapper
Posts: 229
Registered: ‎03-25-2008
Message 2 of 5 (274 Views)

Re: using expression builder to list the distance between points

05-04-2012 11:46 AM in reply to: COLINBIBLE4464

I don't believe you can connect 2 features in a calculation. Therefore you want be able to calculate the distance between. That's what lines are for :smileywink:

 

How many points are we talking?

Valued Mentor
parkr4st
Posts: 474
Registered: ‎03-24-2004
Message 3 of 5 (256 Views)

Re: using expression builder to list the distance between points

05-04-2012 02:02 PM in reply to: tjmapper

sqrt (x^2 + y^2) = the dist on a 2d plane

 

if origin is 0,0

 

then

 Sqrt ( Power (  X1 , 2 )  +  Power (  (Y1, 2 ))

 

so subract x & y of your central point from x1 and y1 of each point

 

ie origin at 1,1

 

 Sqrt ( Power ( ( X1-1) , 2 )  +  Power (  (Y1-1) , 2 ))

 

dave

 

Valued Mentor
parkr4st
Posts: 474
Registered: ‎03-24-2004
Message 4 of 5 (255 Views)

Re: using expression builder to list the distance between points

05-04-2012 02:06 PM in reply to: parkr4st

example i used  UTM83-19 coord sys.  look at the data table. I think this is what you are looking for.

 

Dave

 

 

Contributor
COLINBIBLE4464
Posts: 16
Registered: ‎04-15-2010
Message 5 of 5 (240 Views)

Re: using expression builder to list the distance between points

05-06-2012 05:34 PM in reply to: parkr4st

Thank you guys.

That was the type of solution that I was looking to implement.

I have 20 points (residences) surrounding a potential site.

I was just measuring the distance from the centre of the proposed site ( a coordinate), to each residence (nodes surrounding the proposed site)

I was writing the distances down and adding them to a spreadsheet. I wanted to shortcut that by having the distances automatically update in the data table if I moved a node (residence). Then I would export the data table into the spreadsheet.

 

Colin

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