square buffers

[James Cameron]

Hi,

                Does anyone know how to create square buffers around a line ? I have 800 lines I need to buffer.

 

 

Thanks Jim Cameron

 

 

[Mats Elfström]

James, what is a square buffer?

You could get the MBR and buffer that. But it would be a rectangle. 

Regards, Mats.E

Skickat från min iPhone

25 okt 2011 kl. 11:09 skrev James Cameron <james....@fusiongis.com.au>:

Hi,

                Does anyone know how to create square buffers around a line ? I have 800 lines I need to buffer.

 

 

Thanks Jim Cameron

 

<image001.jpg>

 

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[robert crossley]

The older versions of MapInfo used to not allow you to create buffers with less than 12 nodes, but the later version seems to honour the reduced number of nodes and I think will go down to 3.  Not square, but at least simpler.

R

--

[Uffe Kousgaard]

If it is lines and not polylines, then it shouldn't be so difficult. You just have to calculate the 4 corners, based upon your 2 sets of coordinates.

But it does require mapbasic.

Regards
Uffe Kousgaard

James Cameron wrote:

--

[peter horsboll moller]

MapCAD has an Offset tool that allows you to to offset to both sides and close the ends. Maybe that can solve your problem

Peter

---

Fra: Mats Elfström <mats.e...@gmail.com>
Sendt: 25. oktober 2011 11:14
Til: mapi...@googlegroups.com <mapi...@googlegroups.com>
Emne: Re: [MI-L] square buffers

James, what is a square buffer?

You could get the MBR and buffer that. But it would be a rectangle. 

Regards, Mats.E

Skickat från min iPhone

25 okt 2011 kl. 11:09 skrev James Cameron <james....@fusiongis.com.au>:

Hi,

                Does anyone know how to create square buffers around a line ? I have 800 lines I need to buffer.

 

 

Thanks Jim Cameron

 

<image001.jpg>

 

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[Hele den oprindelige meddelelse er ikke inkluderet]

[Driver, Greg 9434]

If you mean square-ended buffers, then I've used SpatialSQL tool in the past to create these -

 

http://www.spatialprojects.com.au/spatialsql.htm

 

 

Regards

Greg Driver

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[Stackless]

Hi Greg,

Jim posted this question for me and now I have subscribed to the
group. SpatialSQL with a little trial and error gave me the square-end
buffers I was after.

Much appreciated.

Cheers
Kieran Stack
Senior GIS Analyst, Fusion GIS

On Oct 25, 6:52 pm, "Driver, Greg 9434"

<Driver9...@surrey.pnn.police.uk> wrote:
> If you mean square-ended buffers, then I've used SpatialSQL tool in the past to create these -
>
> http://www.spatialprojects.com.au/spatialsql.htm
>

> [cid:594253710@25102011-1039]

>
> Regards
>
> Greg Driver
>
> NOT PROTECTIVELY MARKED
>
>
>
>
>
>
>
> -----Original Message-----
> From: mapi...@googlegroups.com [mailto:mapi...@googlegroups.com] On Behalf Of peter horsboll moller
> Sent: 25 October 2011 11:28
> To: mapi...@googlegroups.com
> Subject: SV: Re: [MI-L] square buffers
>
> MapCAD has an Offset tool that allows you to to offset to both sides and close the ends. Maybe that can solve your problem
>
> Peter
>
> ________________________________

> Fra: Mats Elfström <mats.elfst...@gmail.com>

> Sendt: 25. oktober 2011 11:14
> Til: mapi...@googlegroups.com <mapi...@googlegroups.com>
> Emne: Re: [MI-L] square buffers
>
> James, what is a square buffer?
> You could get the MBR and buffer that. But it would be a rectangle.
>
> Regards, Mats.E
>
> Skickat från min iPhone
>

> 25 okt 2011 kl. 11:09 skrev James Cameron <james.came...@fusiongis.com.au<mailto:james.came...@fusiongis.com.au>>:
>
> Hi,
>                 Does anyone know how to create square buffers around a line ? I have 800 lines I need to buffer.
>
> Thanks Jim Cameron
>
> <image001.jpg>
>
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[college.atlas]

I see it's all over but I wrote a mapbasic routine to do this for any
number of polylines in a table a few years ago.

I remember setting it up so the offset distance would be read from a
column in the table allowing you to create individually widthed
buffers in a single pass.

It's actually bloody complex maths calculating secants and inner and
outer angles.

Nice to know SQLSpatial can do it.

[Seb]

If its capped ends you want and you are happy to convert to shapefile and can download another package, you can use the geoprocess tools in GVsig to do this, it's open source. You can also specify it to buffer to just one side. You can use the buffer in the sextante "add on" for gvsig to do this as well.

 

http://www.osgeo.org/gvsig

 

Cheers

--
Seb Hudson
+44 (0) 1970 625368
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