[geos-devel] Spatial Relationships
Jo
doublebyte at gmail.com
Sat Jun 27 13:37:01 EDT 2009
----------------------------------------------------------------------
Message: 1
Date: Sat, 27 Jun 2009 09:25:43 -0700
From: Mike Toews <mwtoews at sfu.ca>
Subject: Re: [geos-devel] Spatial Relationships
To: GEOS Development List <geos-devel at lists.osgeo.org>
Message-ID: <4A464807.5090002 at sfu.ca>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Jo wrote:
> Hi,
> Does anybody know a good website with clear examples and definitions
> of spatial relationships, such as Touching, Crossing, etc?
ESRI have pretty good documentation on this topic:
http://webhelp.esri.com/arcgisserver/9.3/DotNet/index.htm#geodatabases/spatial_relationships.htm
-Mike
Thanks! That helped :-)
Jo
2009/6/27 <geos-devel-request at lists.osgeo.org>
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> Today's Topics:
>
> 1. Re: Spatial Relationships (Mike Toews)
> 2. Re: Computational Geometry Problem (Jo)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Sat, 27 Jun 2009 09:25:43 -0700
> From: Mike Toews <mwtoews at sfu.ca>
> Subject: Re: [geos-devel] Spatial Relationships
> To: GEOS Development List <geos-devel at lists.osgeo.org>
> Message-ID: <4A464807.5090002 at sfu.ca>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> Jo wrote:
> > Hi,
> > Does anybody know a good website with clear examples and definitions
> > of spatial relationships, such as Touching, Crossing, etc?
>
> ESRI have pretty good documentation on this topic:
>
> http://webhelp.esri.com/arcgisserver/9.3/DotNet/index.htm#geodatabases/spatial_relationships.htm
>
> -Mike
>
>
> ------------------------------
>
> Message: 2
> Date: Sat, 27 Jun 2009 18:23:46 +0100
> From: Jo <doublebyte at gmail.com>
> Subject: Re: [geos-devel] Computational Geometry Problem
> To: geos-devel at lists.osgeo.org
> Message-ID:
> <23ab5f0a0906271023i5a35d902h7e6eecb3fe5aaa64 at mail.gmail.com>
> Content-Type: text/plain; charset="iso-8859-1"
>
> I thought I would published my solution here, for all the ppl who are lazy
> like me, and google for a solution before posting...
> Dis problem is reduced to finding the InCirce of a polygon, which is
> slightly different from the well-known geometry problem: largest empty
> circle.
>
>
> http://www.personal.kent.edu/~rmuhamma/Compgeometry/MyCG/CG-Applets/LgEmptyCircle/lccli.htm<http://www.personal.kent.edu/%7Ermuhamma/Compgeometry/MyCG/CG-Applets/LgEmptyCircle/lccli.htm>
>
> In the "largest empty circle" we calculate the Voronoi Diagrams and test
> each of its vertexes inside the convex-hull as a candidate for the center.
> It all comes down
> to a max-min optimization of the radius: the largest radius, that does not
> contain any points inside (and therefore, the circle is "empty").
> The Largest inscribed circle, is very similar except that here we look for
> a
> circle that does not contain the *actual* polygon (rather than just its
> vertexes).
> The distance we wont to test here is the (minimum) distance of the
> candidate
> centre to the polygon.
> I struggled a little bit here to measure a distance from polygon to a point
> that is located inside it, and ended up having to decompose the polygon to
> its boundary
> to get it done (Im using OGR)!
> Here is the result:
>
> http://ladybug.no-ip.org/files/inCircle.png
>
> Just as a final note: there are plenty (exact) implementations of the
> incircle (or apotheom) of a triangle or a regular polygon, but it becomes a
> bit complicated when we are dealing
> with irregular geometries, which is my case... (and prob everyone else
> workin in GIS)
>
>
> 2009/6/27 <geos-devel-request at lists.osgeo.org>
>
> > Send geos-devel mailing list submissions to
> > geos-devel at lists.osgeo.org
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> > or, via email, send a message with subject or body 'help' to
> > geos-devel-request at lists.osgeo.org
> >
> > You can reach the person managing the list at
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> >
> > When replying, please edit your Subject line so it is more specific
> > than "Re: Contents of geos-devel digest..."
> >
> >
> > Today's Topics:
> >
> > 1. [GEOS] #272: Incorrect mapping to
> > BufferParameters::EndCapStyle in deprecated BufferOp enum (GEOS)
> > 2. Re: [GEOS] #272: Incorrect mapping to
> > BufferParameters::EndCapStyle in deprecated BufferOp enum (GEOS)
> > 3. Spatial Relationships (Jo)
> > 4. Re: Computational Geometry Problem (Sanak)
> > 5. Re: trying to compile on MinGW (Sanak)
> >
> >
> > ----------------------------------------------------------------------
> >
> > Message: 1
> > Date: Fri, 26 Jun 2009 21:15:44 -0000
> > From: "GEOS" <geos-trac at osgeo.org>
> > Subject: [geos-devel] [GEOS] #272: Incorrect mapping to
> > BufferParameters::EndCapStyle in deprecated BufferOp enum
> > To: undisclosed-recipients:;
> > Message-ID: <048.b9f8e1877047e745bbcba46a3b42c4ad at osgeo.org>
> > Content-Type: text/plain; charset="utf-8"
> >
> > #272: Incorrect mapping to BufferParameters::EndCapStyle in deprecated
> > BufferOp
> > enum
> >
> >
> ------------------------+---------------------------------------------------
> > Reporter: cscrimge | Owner: geos-devel at lists.osgeo.org
> > Type: defect | Status: new
> > Priority: minor | Milestone: 3.2.0
> > Component: Core | Version: svn-trunk
> > Severity: Unassigned | Keywords:
> >
> >
> ------------------------+---------------------------------------------------
> > The deprecated enum in BufferOp that maps to
> BufferParameters::EndCapStyle
> > has the following incorrect mapping:
> >
> > CAP_ROUND = BufferParameters::CAP_ROUND,
> > CAP_BUTT = BufferParameters::CAP_FLAT,
> > CAP_SQUARE = BufferParameters::CAP_FLAT
> >
> > --
> > Ticket URL: <http://trac.osgeo.org/geos/ticket/272>
> > GEOS <http://geos.refractions.net/>
> > GEOS (Geometry Engine - Open Source) is a C++ port of the Java Topology
> > Suite (JTS).
> >
> > ------------------------------
> >
> > Message: 2
> > Date: Fri, 26 Jun 2009 21:59:51 -0000
> > From: "GEOS" <geos-trac at osgeo.org>
> > Subject: [geos-devel] Re: [GEOS] #272: Incorrect mapping to
> > BufferParameters::EndCapStyle in deprecated BufferOp enum
> > To: undisclosed-recipients:;
> > Message-ID: <057.7809cb1e3e569205aee2e9211228ac49 at osgeo.org>
> > Content-Type: text/plain; charset="utf-8"
> >
> > #272: Incorrect mapping to BufferParameters::EndCapStyle in deprecated
> > BufferOp
> > enum
> >
> >
> ------------------------+---------------------------------------------------
> > Reporter: cscrimge | Owner: geos-devel at lists.osgeo.org
> > Type: defect | Status: closed
> > Priority: minor | Milestone: 3.2.0
> > Component: Core | Version: svn-trunk
> > Severity: Unassigned | Resolution: fixed
> > Keywords: |
> >
> >
> ------------------------+---------------------------------------------------
> > Changes (by strk):
> >
> > * status: new => closed
> > * resolution: => fixed
> >
> > Comment:
> >
> > Thanks for finding this out. Fixed as r2605.
> >
> > --
> > Ticket URL: <http://trac.osgeo.org/geos/ticket/272#comment:1>
> > GEOS <http://geos.refractions.net/>
> > GEOS (Geometry Engine - Open Source) is a C++ port of the Java Topology
> > Suite (JTS).
> >
> > ------------------------------
> >
> > Message: 3
> > Date: Sat, 27 Jun 2009 12:12:55 +0100
> > From: Jo <doublebyte at gmail.com>
> > Subject: [geos-devel] Spatial Relationships
> > To: geos-devel at lists.osgeo.org
> > Message-ID:
> > <23ab5f0a0906270412o152ba61ag29fbc80c26305eab at mail.gmail.com>
> > Content-Type: text/plain; charset="iso-8859-1"
> >
> > Hi,
> > Does anybody know a good website with clear examples and definitions of
> > spatial relationships, such as Touching, Crossing, etc?
> > (apart from the OGC spec, that didnt help me that much..)
> > Thanks in advance for ur help,
> > Jo
> >
> > --
> > "Law 1: Every program can be optimised to be smaller. Law 2: There's
> always
> > one more bug. Corollary: Every program can be reduced to a one-line bug."
> >
> > (Lubarsky's Laws of Cybernetic Entomology)
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> >
> > ------------------------------
> >
> > Message: 4
> > Date: Sat, 27 Jun 2009 21:31:45 +0900
> > From: Sanak <geosanak at gmail.com>
> > Subject: Re: [geos-devel] Computational Geometry Problem
> > To: GEOS Development List <geos-devel at lists.osgeo.org>
> > Message-ID:
> > <5f9be0a0906270531t3b28212et1c6903157337e4dd at mail.gmail.com>
> > Content-Type: text/plain; charset="iso-8859-1"
> >
> > Hi Jo,
> >
> > You mean you want to know about "Incircle of an irregular polygon"?
> >
> > I don't know that GEOS(or JTS) had already implement it,
> > but if not, you might google the word above. (and I hope GEOS(or JTS)
> > implement it)
> >
> > The following site is written in Japanese, but the images may be helpful.
> > http://izumi-math.jp/K_Katou/tatamu/tatamu.htm
> >
> > Regards,
> >
> > Sanak.
> >
> > 2009/6/27 Jo <doublebyte at gmail.com>
> >
> > > Hi,First of all, I apologize if this post is unrelated to the scope of
> > the
> > > mailing list (I hope not).
> > > I have to find an algorithm to draw the maximum enclosed circle in a
> > > polygon, which is slightly different from the "well-known" geometry
> > problem:
> > > "maximum empty circle"; in this case, not only all the vertices need to
> > be
> > > outside the circle but also the entire perimeter of the polygon must
> > *not*
> > > be inside the circle.
> > > I can get the center of the polygon using Voronoi Diagrams: anybody has
> > any
> > > suggestions or recomendations of how to calculate its radius?
> > > Also, I would like to avoid as much as possible iterative processes (as
> > > they can be slow when dealing with a high number of polygons, that have
> > > complex frontiers)...
> > > It would be really appreciated any ideas on this, or even references to
> > > libraries that could help me... Im not finding a lot of stuff about
> this
> > on
> > > the web :-/ Im using C/C++ but all ideas are welcome, really...
> > >
> > > Thanks in advance for your time!
> > > cheers,
> > > Jo
> > >
> > >
> > > --
> > > "Law 1: Every program can be optimised to be smaller. Law 2: There's
> > always
> > > one more bug. Corollary: Every program can be reduced to a one-line
> bug."
> > >
> > > (Lubarsky's Laws of Cybernetic Entomology)
> > >
> > > _______________________________________________
> > > geos-devel mailing list
> > > geos-devel at lists.osgeo.org
> > > http://lists.osgeo.org/mailman/listinfo/geos-devel
> > >
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> >
> > ------------------------------
> >
> > Message: 5
> > Date: Sat, 27 Jun 2009 22:04:58 +0900
> > From: Sanak <geosanak at gmail.com>
> > Subject: Re: [geos-devel] trying to compile on MinGW
> > To: GEOS Development List <geos-devel at lists.osgeo.org>
> > Message-ID:
> > <5f9be0a0906270604p3320f742r34b2eeefb50e04e at mail.gmail.com>
> > Content-Type: text/plain; charset="iso-8859-1"
> >
> > Hi Allegri,
> >
> > I encountered the same problem today.
> > (I am using gcc-3.4.5, referring to
> > http://trac.osgeo.org/postgis/wiki/UsersWikiWinCompile)
> >
> > The cause seems to be the latest MinGW bug, and Mark has already report
> > MinGW tracker.
> >
> > [Latest MingW download breaks g++ -ansi option - ID: 2373234]
> >
> >
> http://sourceforge.net/tracker/index.php?func=detail&aid=2373234&group_id=2435&atid=102435
> >
> >
> > I had modified "cwchar" file referring to the following site,
> > and I could "make" geos-3.0.4 successfully with the latest MinGW.
> >
> > [g++ compilation error within vim]
> >
> http://www.nabble.com/g%2B%2B-compilation-error-within-vim-td22764394.html
> >
> > Regards,
> >
> > Sanak.
> >
> > 2009/3/19 G. Allegri <giohappy at gmail.com>
> >
> > > Hello list,
> > > this is my very first post. I'm trying to build GEOS 3.0.0 with MSYS
> > 1.0.11
> > > + MinGW 5.1.4 environment and Windows Vista SP1.
> > > make aborts with the following traceback:
> > >
> > > g++ -DHAVE_CONFIG_H -I. -I. -I../../source/headers
> > > -I../../source/headers/geos -I../../source/headers -g -O2 -DGEOS_INLINE
> > > -Wall -ansi -pedantic -Wno-long-long -MT CGAlgorithms.lo -MD -MP -MF
> > > .deps/CGAlgorithms.Tpo -c CGAlgorithms.cpp -DDLL_EXPORT -DPIC -o
> > > .libs/CGAlgorithms.o
> > > In file included from
> > >
> >
> C:/msys/mingw/bin/../lib/gcc/mingw32/3.4.5/../../../../include/c++/3.4.5/bits/postypes.h:46,
> > > from
> > >
> >
> C:/msys/mingw/bin/../lib/gcc/mingw32/3.4.5/../../../../include/c++/3.4.5/iosfwd:50,
> > > from
> > >
> >
> C:/msys/mingw/bin/../lib/gcc/mingw32/3.4.5/../../../../include/c++/3.4.5/bits/stl_algobase.h:70,
> > > from
> > >
> >
> C:/msys/mingw/bin/../lib/gcc/mingw32/3.4.5/../../../../include/c++/3.4.5/vector:67,
> > > from
> > > ../../source/headers/geos/algorithm/CGAlgorithms.h:24,
> > > from CGAlgorithms.cpp:21:
> > >
> >
> C:/msys/mingw/bin/../lib/gcc/mingw32/3.4.5/../../../../include/c++/3.4.5/cwchar:161:
> > > error: `::swprintf' has not been declared
> > >
> >
> C:/msys/mingw/bin/../lib/gcc/mingw32/3.4.5/../../../../include/c++/3.4.5/cwchar:168:
> > > error: `::vswprintf' has not been declared
> > > make[2]: *** [CGAlgorithms.lo] Error 1
> > > make[2]: Leaving directory `/usr/local/src/geos-3.0.0/source/algorithm'
> > > make[1]: *** [all-recursive] Error 1
> > > make[1]: Leaving directory `/usr/local/src/geos-3.0.0/source'
> > > make: *** [all-recursive] Error 1
> > >
> > > I don't know how to solve the "error: `::swprintf' has not been
> declared"
> > > error. Any idea? What could cause it?
> > > Thanks,
> > > Giovanni
> > >
> > >
> > > _______________________________________________
> > > geos-devel mailing list
> > > geos-devel at lists.osgeo.org
> > > http://lists.osgeo.org/mailman/listinfo/geos-devel
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> > End of geos-devel Digest, Vol 80, Issue 19
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>
>
>
> --
> "Law 1: Every program can be optimised to be smaller. Law 2: There's always
> one more bug. Corollary: Every program can be reduced to a one-line bug."
>
> (Lubarsky's Laws of Cybernetic Entomology)
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> ******************************************
>
--
"Law 1: Every program can be optimised to be smaller. Law 2: There's always
one more bug. Corollary: Every program can be reduced to a one-line bug."
(Lubarsky's Laws of Cybernetic Entomology)
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