Hi Andrea, Thanks for replying back. As suggested by you, I can try the same in a reprojected system. But, which coordinate system should I use(there are may u know)? I had reported the issue using the coordinate system GEOG/WGS 84.
Suryakant B --- On Wed, 30/1/13, andrea antonello <[email protected]> wrote: From: andrea antonello <[email protected]> Subject: Re: [udig-devel] Fill Area tool does not give correct results always To: "User-friendly Desktop Internet GIS" <[email protected]> Date: Wednesday, 30 January, 2013, 11:39 AM Hi Suryakant,that is quite one interesting issue. I am wondering if that is a problem of precision model. In your case you are using very wide lat long coordinates, which might lead at that level of non-detail to some rounding issues in the JTS results? Can you try the same in a reprojected system? I tried to check the geometries you report in the JTS testbuilder and they already have the extra lines. Let me know how the tests go, I will check also as soon as I can. Andrea On Wed, Jan 30, 2013 at 6:08 AM, suryakant bhagat <[email protected]> wrote: Hi, I am using 2 tools as follows. 1. Create Polygon Tool ==> I draw a polygon. I have numbered it as 1 in the attached image. 2. Fill Area Tool ==> I use the fill tool and complete filling area marked 2 in the attached image. I again use the fill tool and complete filling area marked 3 in the attached image. Now the resultant polygon marked 3 is incorrectly filled. The resultant polygon has an extra line(highlighted in the image) which should not be present in the resultant polygon. I did a walkthrough of the code to understand the cause. I debugged the method runDifferenceOp in the class DifferenceFeatureCommand. After I complete filling area marked 3 in the attached image, I get following results. 1. The createdGeometry is POLYGON ((-67.39088271309409 27.934044647914646, -74.37439387507274 60.75654710921435, -55.16973817963144 83.10378282754607, -16.062075672550947 67.39088271309407, -13.967022323957337 37.36178471658584, -24.791464625024247 9.427740068671199, -67.39088271309409 27.934044647914646)) 2. The existingGeometry is POLYGON ((-47.951394159917214 44.09570912400787, -53.07468483103783 53.77303594723569, -12.221144533462677 57.61396708632395, 27.584869089815697 29.33074688031038, 15.0145489982541 -14.316197882056258, -9.15177506194378 3.405773095422192, 0.3491755580989206 3.840931139088269, -45.392822552861304 1.7458777904946743, -82.40543171134821 5.237633371483994, -85.19883617613966 43.64694476236663, -27.235693531716777 44.3452958785645, -47.951394159917214 44.09570912400787)) 3. The differenceGeometry is POLYGON ((-70.77103782166621 43.82077365820366, -74.37439387507274 60.75654710921435, -55.16973817963144 83.10378282754607, -16.062075672550947 67.39088271309407, -15.359380547632652 57.3189192559319, -53.07468483103783 53.77303594723569, -47.951394159917214 44.09570912400787, -27.235693531716777 44.3452958785645, -70.77103782166621 43.82077365820366)) The difference calculated is incorrect. It is not as per the definition of the method given in the api. I am quoting the api definition here(com.vividsolutions.jts.geom.Geometry). -------------------------------------------------------------------------------------------------------------------------------- differencepublic Geometry difference(Geometry other) Computes a Geometry representing the points making up this Geometry that do not make up other. This method returns the closure of the resultant Geometry. Parameters: other - the Geometry with which to compute the difference Returns: the point set difference of this Geometry with other ----------------------------------------------------------------------------------------------------------------------------------- Is it a bug or I am wrong in my undersatnding. Also, how do I correct it? Please let me know. Thanks and Regards, Suryakant B _______________________________________________ User-friendly Desktop Internet GIS (uDig) http://udig.refractions.net http://lists.refractions.net/mailman/listinfo/udig-devel -----Inline Attachment Follows----- _______________________________________________ User-friendly Desktop Internet GIS (uDig) http://udig.refractions.net http://lists.refractions.net/mailman/listinfo/udig-devel
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