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From: Andrea Aime <andrea.aime@ge...>  20110317 16:24:38

On Thu, Mar 17, 2011 at 4:44 PM, Andrea Aime <andrea.aime@...> wrote: > On Thu, Mar 17, 2011 at 3:36 PM, Jan Torben Heuer > <jan_key67234@...> wrote: >> Mike Hampton wrote: >> >>> I have a lat/long, and a radius in feet. My ellipsoid is WGS84. >>> >>> Is there any simple way to calculate the lat/long points on a circle given >>> this information? I understand the math, and can do that if needed, but I >>> find it hard to believe that this type of functionality has not already >>> been written. >> >> You explicitly mention WGS84, so one question: Do we speak about a circle of >> a few tens of meters or about really large scales? >> >> In the first case, I recommend the GeodeticCalculator. I think you can >> define a point in certain direction (lat,lng,azimuth) with a distance of x >> meters. >> >> In the second case, I think it is more difficult. > > GeodeticCalculator should work fine in the second case as well, it uses precise > elliptical formulas, not the sphere approximations, however, there might be > issues is the circle is so large that it will engulf the north pole or > cross the date line Ah btw, there is a GeoServer WPS process doing exactly this kind of computation, see here: http://geosolutions.blogspot.com/2010/11/funstuffcomputingcircularbuffersin.html Cheers Andrea   Ing. Andrea Aime GeoSolutions S.A.S. Tech lead Via Poggio alle Viti 1187 55054 Massarosa (LU) Italy phone: +39 0584 962313 fax: +39 0584 962313 mob: +39 333 8128928 http://www.geosolutions.it http://geosolutions.blogspot.com/ http://www.youtube.com/user/GeoSolutionsIT http://www.linkedin.com/in/andreaaime http://twitter.com/geowolf  
From: Andrea Aime <andrea.aime@ge...>  20110317 15:44:24

On Thu, Mar 17, 2011 at 3:36 PM, Jan Torben Heuer <jan_key67234@...> wrote: > Mike Hampton wrote: > >> I have a lat/long, and a radius in feet. My ellipsoid is WGS84. >> >> Is there any simple way to calculate the lat/long points on a circle given >> this information? I understand the math, and can do that if needed, but I >> find it hard to believe that this type of functionality has not already >> been written. > > You explicitly mention WGS84, so one question: Do we speak about a circle of > a few tens of meters or about really large scales? > > In the first case, I recommend the GeodeticCalculator. I think you can > define a point in certain direction (lat,lng,azimuth) with a distance of x > meters. > > In the second case, I think it is more difficult. GeodeticCalculator should work fine in the second case as well, it uses precise elliptical formulas, not the sphere approximations, however, there might be issues is the circle is so large that it will engulf the north pole or cross the date line Cheers Andrea   Ing. Andrea Aime GeoSolutions S.A.S. Tech lead Via Poggio alle Viti 1187 55054 Massarosa (LU) Italy phone: +39 0584 962313 fax: +39 0584 962313 mob: +39 333 8128928 http://www.geosolutions.it http://geosolutions.blogspot.com/ http://www.youtube.com/user/GeoSolutionsIT http://www.linkedin.com/in/andreaaime http://twitter.com/geowolf  
From: Jan Torben Heuer <jan_key67234@jt...>  20110317 14:37:16

Mike Hampton wrote: > I have a lat/long, and a radius in feet. My ellipsoid is WGS84. > > Is there any simple way to calculate the lat/long points on a circle given > this information? I understand the math, and can do that if needed, but I > find it hard to believe that this type of functionality has not already > been written. You explicitly mention WGS84, so one question: Do we speak about a circle of a few tens of meters or about really large scales? In the first case, I recommend the GeodeticCalculator. I think you can define a point in certain direction (lat,lng,azimuth) with a distance of x meters. In the second case, I think it is more difficult. Jan  >From address is valid until 01.06.2011 
From: Mike Hampton <mike.hampton@is...>  20110317 14:24:13

I have a lat/long, and a radius in feet. My ellipsoid is WGS84. Is there any simple way to calculate the lat/long points on a circle given this information? I understand the math, and can do that if needed, but I find it hard to believe that this type of functionality has not already been written. I have researched this and found the following, but I am not sure how to specify the RADIUS given a measurement of feet. private static Geometry createCircle(GeometryFactory geometryFactory, double x, double y, final double RADIUS) { final int SIDES = 32; Coordinate coords[] = new Coordinate[SIDES+1]; for( int i = 0; i < SIDES; i++){ double angle = ((double) i / (double) SIDES) * Math.PI * 2.0; double dx = Math.cos( angle ) * RADIUS; double dy = Math.sin( angle ) * RADIUS; coords[i] = new Coordinate( (double) x + dx, (double) y + dy ); } coords[SIDES] = coords[0]; LinearRing ring = geometryFactory.createLinearRing( coords ); Polygon polygon = geometryFactory.createPolygon( ring, null ); return polygon; } Thanks in advance. Mike Hampton Senior Software Engineer Intelligent Software Solutions<http://www.issinc.com/>; 5450 Tech Center Drive Colorado Springs, CO 809192341 Office: 719.234.0655 US Cell: 719.440.4889 Yahoo IM: javamike9 AOL IM: javamike9 Gmail: mike.hampton.issinc.com@...<mailto:mike.hampton.issinc.com@...> Skype: mike.hampton.issinc.com 
From: Peter Borissow <peter.borissow@ya...>  20110317 11:30:03

From: Benoît Thiébault <thiebault@ar...>  20110317 08:14:46

Hi Michael, Of course you can :) I need a ProjectedCRS because I have to pass a ProjectedCRS to a helper class of my application. This helper class stores the current GeodeticCRS and ProjectedCRS and if the user changes the projection system, it tells all its listeners to convert their coordinates to the new projection. Of course, I could in this helper class store only CoordinatesReferenceSystem objects, but this would have an impact on a lot of code... Moreover, I prefer using ProjectedCRS than CoordinatesReferenceSystem in order to prevent too many casts. This problem is really blocking for me right now and I would be very pleased to find an answer... Ben Le 17 mars 2011 à 06:38, Michael Bedward a écrit : > Hi Ben, > > It doesn't look like anyone has an easy answer for this one  unless > this bump flushes one out. > > Can I ask you why it is important to have a ProjectedCRS rather than > working with the DefaultDerivedCRS ? > > Michael > > > 2011/3/11 Benoît Thiébault <thiebault@...>: >> Hi everyone, >> >> I have created a DefaultDerivedCRS that is a rotation of a ProjectedCRS (called selectedCRS) like this: >> >>> CoordinateReferenceSystem transformedCRS = selectedCRS; >>> >>> if (getAngleRadians() != 0.0) { >>> // Create the rotation transform >>> final AffineTransform rotation = new AffineTransform(); >>> rotation.rotate(getAngleRadians(), getRotationProjCenter().x, getRotationProjCenter().y); >>> >>> // Creates the math transform >>> final MathTransform transform = ProjectiveTransform.create(rotation); >>> >>> // Sets the new CRS name >>> String crsName = selectedCRS.getName().toString(); >>> if (getAngleRadians() != 0) { >>> final DecimalFormat formatter = new DecimalFormat("#.##"); >>> final String rotationText = formatter.format(Math.toDegrees(getAngleRadians())); >>> crsName += " / Rotation: " + rotationText + "°"; >>> } >>> >>> // Rotates the CRS >>> transformedCRS = new DefaultDerivedCRS(crsName, selectedCRS, transform, selectedCRS.getCoordinateSystem()); >> >> My problem is that this method is expected to return a ProjectedCRS and if I simply cast the DefaultDerivedCRS to ProjectedCRS, I get a ClassCastException. >> >> How can I create such a rotated ProjectedCRS from another ProjectedCRS ? >> >> Kind regards, >> Ben >> >>  >> Dr Benoît Thiébault >> Project Manager >> >> Artenum Toulouse  Science & Groupware >> http://www.artenum.com >> >> Bâtiment Calfocenter >> 10, rue Marguerite Long >> 31 320 Castanet Tolosan >> Phone: +33 (0)5 62 19 32 22 >> >> >>  >> 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/internapsfd2d >> _______________________________________________ >> Geotoolsgt2users mailing list >> Geotoolsgt2users@... >> https://lists.sourceforge.net/lists/listinfo/geotoolsgt2users >>  Dr Benoît Thiébault Project Manager Artenum Toulouse  Science & Groupware http://www.artenum.com Bâtiment Calfocenter 10, rue Marguerite Long 31 320 Castanet Tolosan Phone: +33 (0)5 62 19 32 22 
From: Michael Bedward <michael.bedward@gm...>  20110317 05:38:26

Hi Ben, It doesn't look like anyone has an easy answer for this one  unless this bump flushes one out. Can I ask you why it is important to have a ProjectedCRS rather than working with the DefaultDerivedCRS ? Michael 2011/3/11 Benoît Thiébault <thiebault@...>: > Hi everyone, > > I have created a DefaultDerivedCRS that is a rotation of a ProjectedCRS (called selectedCRS) like this: > >> CoordinateReferenceSystem transformedCRS = selectedCRS; >> >> if (getAngleRadians() != 0.0) { >> // Create the rotation transform >> final AffineTransform rotation = new AffineTransform(); >> rotation.rotate(getAngleRadians(), getRotationProjCenter().x, getRotationProjCenter().y); >> >> // Creates the math transform >> final MathTransform transform = ProjectiveTransform.create(rotation); >> >> // Sets the new CRS name >> String crsName = selectedCRS.getName().toString(); >> if (getAngleRadians() != 0) { >> final DecimalFormat formatter = new DecimalFormat("#.##"); >> final String rotationText = formatter.format(Math.toDegrees(getAngleRadians())); >> crsName += " / Rotation: " + rotationText + "°"; >> } >> >> // Rotates the CRS >> transformedCRS = new DefaultDerivedCRS(crsName, selectedCRS, transform, selectedCRS.getCoordinateSystem()); > > My problem is that this method is expected to return a ProjectedCRS and if I simply cast the DefaultDerivedCRS to ProjectedCRS, I get a ClassCastException. > > How can I create such a rotated ProjectedCRS from another ProjectedCRS ? > > Kind regards, > Ben > >  > Dr Benoît Thiébault > Project Manager > > Artenum Toulouse  Science & Groupware > http://www.artenum.com > > Bâtiment Calfocenter > 10, rue Marguerite Long > 31 320 Castanet Tolosan > Phone: +33 (0)5 62 19 32 22 > > >  > 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/internapsfd2d > _______________________________________________ > Geotoolsgt2users mailing list > Geotoolsgt2users@... > https://lists.sourceforge.net/lists/listinfo/geotoolsgt2users > 
From: Ben CaradocDavies <Ben.CaradocD<avies@cs...>  20110317 01:50:10

Andrea has fixed this by uploading some jars to the opengeo repository. Please let us know if pain persists. On 16/03/11 21:51, Francisco wrote: > Spain > > 2011/3/16 Andrea Aime<andrea.aime@...<mailto:andrea.aime@...>> > On Wed, Mar 16, 2011 at 9:58 AM, Francisco<ricken11@...<mailto:ricken11@...>> wrote: >> Hi people, what's happend with de maven release repository: >> >> http://download.osgeo.org/webdav/geotools/ >> >> Is down? > > It is up, but unreachable from quite a bit of people due to some > changes in routing. > Where are you located? In Italy where I live the situation is half and > half, some > providers still allow access, with others it does not work anymore > > Cheers > Andrea > >  >  > Ing. Andrea Aime > GeoSolutions S.A.S. > Tech lead > > Via Poggio alle Viti 1187 > 55054 Massarosa (LU) > Italy > > phone: +39 0584 962313 > fax: +39 0584 962313 > mob: +39 333 8128928 > > http://www.geosolutions.it > http://geosolutions.blogspot.com/ > http://www.youtube.com/user/GeoSolutionsIT > http://www.linkedin.com/in/andreaaime > http://twitter.com/geowolf > >  > > > >  > Un día te encontré y al otro te perdí >  Ben CaradocDavies <Ben.CaradocDavies@...> Software Engineering Team Leader CSIRO Earth Science and Resource Engineering Australian Resources Research Centre 