date:20110428

Re: [JPP-Devel] Shape analysis using area-perimeter ratio

2011-04-28 Thread Larry Becker

Hi Michaël and Martin,

Thanks for confirming that this is a valid shape analysis technique. The
great thing about this list is getting instant access to a large depth and
breadth of algorithmic knowledge.

My current requirement is to sort a list of CAD figures into either
linestring or polygon shapefiles. (BTW, I'm not doing this in JUMP at the
present time, but in an external program, so I apologize for the off-topic
post.) The CAD figures are not composed of lines, thank goodness, so a
graph analysis is not necessary.

Without applying some kind of algorithm, the only available technique is
to check to see if the figure is closed. This caused a problem with utility
loops (i.e. water lines) showing up as polygons. Putting in an area
threshold check partially solved that problem (utility loops are large), but
caused large pavement polygons to show up as linestrings. I'm betting on
the fact that pavement polygons tend to be long and thin, and utility loops
tend to be more circular, although this has yet to be conclusively
demonstrated. However, the technique doesn't have to be fool-proof to save
time. It just has to be right about 80% of the time.

regards,

Larry

On Wed, Apr 27, 2011 at 7:31 PM, Martin Davis mtncl...@telus.net wrote:

We implemented this as part of the JCS Conflation Suite (which was the
reason JUMP was originally developed!)

There's a whole body of theory around shape recognition - much of which is
very complicated and hard to implement/use. The circularity ratio is one of
the more usable techniques.

Martin

On 4/27/2011 2:00 PM, Larry Becker wrote:

I had a need to classify polygon shapes into general categories such as
roads and buildings, and I though it might be possible to use a thinness
factor calculated using the area and perimeter. After fooling around with
it for a while and not getting the answer, I goggled and found the following
solution:

lCircularity ratio: the ratio of the area of the shape to the area of a
circle (the most compact shape) having the same perimeter. (area-perimeter
ratio)

M = ( 4 * Pi * Area of Polygon) / (Perimeter of Polygon)^2

For a circle, the ratio is one; for a square, it is π / 4; for an
infinitely long and narrow shape, it is zero.

I found it at: http://ce.sharif.edu/~alamgir/

Further searches indicate that this method of classification may be
relatively unknown. Does anyone have knowledge in this area?

regards,

Larry Becker

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Re: [JPP-Devel] Implemented feature requests

2011-04-28 Thread Sunburned Surveyor

Thanks Michael. I think I'm going to dub  you OJ's new benevolent benefactor!

Landon

2011/3/15 Michaël Michaud michael.mich...@free.fr:
 Hi,

 You're right, these feature requests are now implemented.

 I just have updated the Feature request tracker, thanks for your help

 Michaël

 I

 Le 15/03/2011 12:52, Rahkonen Jukka a écrit :

 Hi,

 I was browsing through the open feature requests and I suppose that at least
 these two are implemented nowadays

 Character set and saving the dbf file
 http://sourceforge.net/tracker/?func=detailaid=1728845group_id=118054atid=679909
 Invert selection
 http://sourceforge.net/tracker/?func=detailaid=1755636group_id=118054atid=679909

 -Jukka Rahkonen-



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Re: [JPP-Devel] moving files on sf.net

2011-04-28 Thread Sunburned Surveyor

Ede,

Did you get this problem fixed? If not, I'm set up to access our files
on Sourceforge over FTP, and I can try moving things there. Let me
know.

Landon

On Sun, Mar 13, 2011 at 2:48 PM,  edgar.sol...@web.de wrote:
 On 13.03.2011 22:28, Michaël Michaud wrote:
 Do you use sourceforge user interface at
 https://sourceforge.net/projects/jump-pilot/files/ ?
 It seems that you now have same privilege as I have (I just changed your
 task manager status to admin)

 i can do lots of stuff but obviously 'project admins' cannot take over 
 ownerships in the frs filesystem.

 If I can do the merge, just tell me exactly what you intended to move /
 cancel.

 i mentioned the paths in the email before. can/do you access sourceforge by 
 sftp/ssh sometimes? then you could try. i am moving 'oj win32 installer' over 
 to 'openjump' as discussed before.

 If you learn more from sourceforge how you can get privilege to merge
 those directories, please let me know. As you can see, my knowledge
 about administration tasks is very basic.

 will do, if stefan is not available at all. anybody knows anything? i 
 forwarded the last email to him personally as well.

 ..gv thx, ede

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Re: [JPP-Devel] Btter Display/Snapping grid?

2011-04-28 Thread Sunburned Surveyor

Martin,

Can you give me a pointer to the package(s) in JTS test builder that
we'd want to look at for code to port to OJ for the grid?

Thanks,

Landon

On Sun, Mar 6, 2011 at 2:20 PM, Martin Davis mtncl...@telus.net wrote:
 Yes, in the JTS TestBuilder the finest grid is the one snapped to.  It's
 visually obvious.

 But... the user doesn't ask to snap to a particular grid.  The
 snapping is always to the grid displayed, which depends on zoom level.

 I've found this to be more flexible and easier to use than having a
 single defined snapping grid.  But the two can coexist happily - just
 display the user-defined grid as well as the variable-size grid.  And
 allow any or all to be enabled.

 On 3/6/2011 2:02 PM, Michaël Michaud wrote:
 I think I would snap only to the 1x grid not to deviate coordinate
 inputs when it is not required.
 I would also differenciate the 1x grid from others as this is the one
 the user asked to snap to.

 Michaël


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Re: [JPP-Devel] moving files on sf.net

2011-04-28 Thread edgar . soldin

Sunburned,

all fixed by now .. you might have noticed the changed files section folder 
structure. .. thanks ede


On 28.04.2011 16:32, Sunburned Surveyor wrote:
 Ede,
 
 Did you get this problem fixed? If not, I'm set up to access our files
 on Sourceforge over FTP, and I can try moving things there. Let me
 know.
 
 Landon
 
 On Sun, Mar 13, 2011 at 2:48 PM,  edgar.sol...@web.de wrote:
 On 13.03.2011 22:28, Michaël Michaud wrote:
 Do you use sourceforge user interface at
 https://sourceforge.net/projects/jump-pilot/files/ ?
 It seems that you now have same privilege as I have (I just changed your
 task manager status to admin)

 i can do lots of stuff but obviously 'project admins' cannot take over 
 ownerships in the frs filesystem.

 If I can do the merge, just tell me exactly what you intended to move /
 cancel.

 i mentioned the paths in the email before. can/do you access sourceforge by 
 sftp/ssh sometimes? then you could try. i am moving 'oj win32 installer' 
 over to 'openjump' as discussed before.

 If you learn more from sourceforge how you can get privilege to merge
 those directories, please let me know. As you can see, my knowledge
 about administration tasks is very basic.

 will do, if stefan is not available at all. anybody knows anything? i 
 forwarded the last email to him personally as well.

 ..gv thx, ede

 --
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 A question and answer guide to determining the best fit
 for your organization - today and in the future.
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Re: [JPP-Devel] moving files on sf.net

2011-04-28 Thread Sunburned Surveyor

Just checking. Getting to clean out my e-mail inbox this morning. :]

Thanks,

Landon

On Thu, Apr 28, 2011 at 7:41 AM,  edgar.sol...@web.de wrote:
 Sunburned,

 all fixed by now .. you might have noticed the changed files section folder 
 structure. .. thanks ede


 On 28.04.2011 16:32, Sunburned Surveyor wrote:
 Ede,

 Did you get this problem fixed? If not, I'm set up to access our files
 on Sourceforge over FTP, and I can try moving things there. Let me
 know.

 Landon

 On Sun, Mar 13, 2011 at 2:48 PM,  edgar.sol...@web.de wrote:
 On 13.03.2011 22:28, Michaël Michaud wrote:
 Do you use sourceforge user interface at
 https://sourceforge.net/projects/jump-pilot/files/ ?
 It seems that you now have same privilege as I have (I just changed your
 task manager status to admin)

 i can do lots of stuff but obviously 'project admins' cannot take over 
 ownerships in the frs filesystem.

 If I can do the merge, just tell me exactly what you intended to move /
 cancel.

 i mentioned the paths in the email before. can/do you access sourceforge by 
 sftp/ssh sometimes? then you could try. i am moving 'oj win32 installer' 
 over to 'openjump' as discussed before.

 If you learn more from sourceforge how you can get privilege to merge
 those directories, please let me know. As you can see, my knowledge
 about administration tasks is very basic.

 will do, if stefan is not available at all. anybody knows anything? i 
 forwarded the last email to him personally as well.

 ..gv thx, ede

 --
 Colocation vs. Managed Hosting
 A question and answer guide to determining the best fit
 for your organization - today and in the future.
 http://p.sf.net/sfu/internap-sfd2d
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Re: [JPP-Devel] moving files on sf.net

2011-04-28 Thread Edgar Soldin

Sunburned,

all fixed by now .. you might have noticed the changed files section folder 
structure. .. thanks ede


On 28.04.2011 16:32, Sunburned Surveyor wrote:
 Ede,
 
 Did you get this problem fixed? If not, I'm set up to access our files
 on Sourceforge over FTP, and I can try moving things there. Let me
 know.
 
 Landon
 
 On Sun, Mar 13, 2011 at 2:48 PM,  edgar.sol...@web.de wrote:
 On 13.03.2011 22:28, Michaël Michaud wrote:
 Do you use sourceforge user interface at
 https://sourceforge.net/projects/jump-pilot/files/ ?
 It seems that you now have same privilege as I have (I just changed your
 task manager status to admin)

 i can do lots of stuff but obviously 'project admins' cannot take over 
 ownerships in the frs filesystem.

 If I can do the merge, just tell me exactly what you intended to move /
 cancel.

 i mentioned the paths in the email before. can/do you access sourceforge by 
 sftp/ssh sometimes? then you could try. i am moving 'oj win32 installer' 
 over to 'openjump' as discussed before.

 If you learn more from sourceforge how you can get privilege to merge
 those directories, please let me know. As you can see, my knowledge
 about administration tasks is very basic.

 will do, if stefan is not available at all. anybody knows anything? i 
 forwarded the last email to him personally as well.

 ..gv thx, ede

 --
 Colocation vs. Managed Hosting
 A question and answer guide to determining the best fit
 for your organization - today and in the future.
 http://p.sf.net/sfu/internap-sfd2d
 ___
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Re: [JPP-Devel] Btter Display/Snapping grid?

2011-04-28 Thread Martin Davis

There's two parts to this concept - snapping to a dynamic grid, and
displaying a dynamic grid to show several magnitiudes of grid levels at
once.

For the Dynamic Grid rendering code, see:

http://jts-topo-suite.svn.sourceforge.net/viewvc/jts-topo-suite/trunk/jts/java/src/com/vividsolutions/jtstest/testbuilder/ui/render/GridRenderer.java?view=log

For the snapping code, see the method

public Point2D toModel(Point2D viewPt) {

and the method snapScale()

http://jts-topo-suite.svn.sourceforge.net/viewvc/jts-topo-suite/trunk/jts/java/src/com/vividsolutions/jtstest/testbuilder/Viewport.java?view=log

On 4/28/2011 7:37 AM, Sunburned Surveyor wrote:
Martin,

Can you give me a pointer to the package(s) in JTS test builder that
we'd want to look at for code to port to OJ for the grid?

Thanks,

Landon

On Sun, Mar 6, 2011 at 2:20 PM, Martin Davismtncl...@telus.net wrote:
Yes, in the JTS TestBuilder the finest grid is the one snapped to. It's
visually obvious.

But... the user doesn't ask to snap to a particular grid. The
snapping is always to the grid displayed, which depends on zoom level.

I've found this to be more flexible and easier to use than having a
single defined snapping grid. But the two can coexist happily - just
display the user-defined grid as well as the variable-size grid. And
allow any or all to be enabled.

On 3/6/2011 2:02 PM, Michaël Michaud wrote:
I think I would snap only to the 1x grid not to deviate coordinate
inputs when it is not required.
I would also differenciate the 1x grid from others as this is the one
the user asked to snap to.

Michaël

--
What You Don't Know About Data Connectivity CAN Hurt You
This paper provides an overview of data connectivity, details
its effect on application quality, and explores various alternative
solutions. http://p.sf.net/sfu/progress-d2d
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Re: [JPP-Devel] Shape analysis using area-perimeter ratio

Re: [JPP-Devel] Implemented feature requests

Re: [JPP-Devel] moving files on sf.net

Re: [JPP-Devel] Btter Display/Snapping grid?

Re: [JPP-Devel] moving files on sf.net

Re: [JPP-Devel] moving files on sf.net

Re: [JPP-Devel] moving files on sf.net

Re: [JPP-Devel] Btter Display/Snapping grid?

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