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Buffer creation

10 REPLIES 10
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Message 1 of 11
erictsn001
375 Views, 10 Replies

Buffer creation

I have a hundred of points which have associated to a db; how I can generate the buffer for each point which the buffer size is accord to the specific column of the db? Can it do that?

Thanks
10 REPLIES 10
Message 2 of 11
Anonymous
in reply to: erictsn001

Dono if that can be done, but an alternative is to create circles of all points with the diameter you specified. Then create a topology from that.
Message 3 of 11
erictsn001
in reply to: erictsn001

Hi Mikeknud
Could you talk more detail how to do? /Thanks
Message 4 of 11
Anonymous
in reply to: erictsn001

You could create a lisp routine or make a script which creates circles with the diameter and centerpoint from your database.

Script for 2 points with diameter would look like:

CIRCLE
123,456
DIAMETER
2.10
CIRCLE
222,444
DIAMETER
6.40

Then create a topology of the circles to use for a eg. a buffer.
Message 5 of 11
Anonymous
in reply to: erictsn001

eric

Provided the points are in a database you may be able to query the database
creating new information from present data which could then serve as the
source for Map to do analysis.

dave


wrote in message news:5783947@discussion.autodesk.com...
I have a hundred of points which have associated to a db; how I can generate
the buffer for each point which the buffer size is accord to the specific
column of the db? Can it do that?

Thanks
Message 6 of 11
drazen-ars
in reply to: erictsn001

Hi Erictsn,

If I well understand you have in the drawing points which are connected to the database and in one database field there is buffer distance which vary.

If this is so, your problem is very simple to solve.

1. Create point topology
2. Start topology analysis, buffer analysis. There you can define constant buffer value but also you can show to appropriate field in connected database

If you do not have points in the drawing or points are not through link template connected to the database I suggest that you insert somehow (some additional programs) points as block with attribute of the name of the point. That attribute you can use to connect automatically to the database. Then you can start buffer analysis with the value from database.

Drazen Galic
d.galic@studioars.hr
www.studioars.com
Message 7 of 11
JohnPM
in reply to: erictsn001

I tried the same and was only able to get the point buffer analysis to buffer the using the first field in the linked database. It would ignore the other field values. I assumed it would read all the field entries since each point was linked manually to its linked field value. The analysis resulted in a buffer around all the points and not individually.

John
Message 8 of 11
Anonymous
in reply to: erictsn001

I have not tried it with a db link but with OD it works.

--

Murph
The world is not FLAT so why is your GIS data?
http://map3d.wordpress.com
wrote in message news:5784890@discussion.autodesk.com...
I tried the same and was only able to get the point buffer analysis to
buffer the using the first field in the linked database. It would ignore the
other field values. I assumed it would read all the field entries since each
point was linked manually to its linked field value. The analysis resulted
in a buffer around all the points and not individually.

John
Message 9 of 11
drazen-ars
in reply to: erictsn001

Dear John,

I tried to do it, and seems that everything is functioning. If I well understand your problem.
I attached the picture of my screen. I have 5 points and MDB database which second column has different buffer values. When I make buffer analysis it is visible that 5 different points have 5 different buffer values (from 10 to 35).

Drazen Galic
d.galic@studioars.hr
www.studioars.com
Message 10 of 11
erictsn001
in reply to: erictsn001

Hi Drazen,

After I saw your attachment, I have idea how to work it out. I export all object with attribute to sdf file and do mapimport to import the sdf object to new dwg. And then create node topology. Finally I can create buffer which is according the OD attribute.

But it seems quite slow, do yours expert know any good solution?

Thanks in advance.
Message 11 of 11
drazen-ars
in reply to: erictsn001

Hi Erictsn,

I did not check the whole procedure in reality. How much points do you have? How slow it is?

I did check with aproximately 7000 points, block with atributes. In one atribute I have value of buffer. I made node topology (3-4 seconds) and than buffer analysis according to block atribute value. It required cca 20 seconds to make it.

My computer is laptop, 2.4 GHz, dual core, 2 Mb Ram, Windows XP, Map 2008.

Is that slow?

Drazen Galic
d.galic@studioars.hr
www.studioars.com

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