Martin Davis, Senior Technical Specialist Vivid Solutions Inc. Suite #1A-2328 Government Street Victoria, B.C. V8T 5G5 Phone: (250) 385 6040 Fax: (250)...
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jonathan_aquino
jonathan_aquino@...
Feb 25, 2002 5:21 pm
X...
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mbdavis@...
Feb 26, 2002 12:44 am
We are nearly finished working on JTS Version 1.1. This version contains the following changes and additions: It adds the isSimple and isValid methods to...
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Sondheim, Mark SRM:EX
Mark.Sondheim@...
Feb 27, 2002 12:47 am
Yao to provide further details - Are overlapping points allowed in a multipoint? overlapping line segments in a multiline? Can you remove the orange ring...
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andyturk
andyturk@...
Mar 3, 2002 6:57 pm
I'm thinking about using the CoordinateFilter interface to implement projection support (via Proj.4). I'm thinking of something like this: Geometry g = <some...
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Cameron Shorter
cshorter@...
Mar 3, 2002 7:10 pm
I probably should have copied to this list when sending this email. I'm trashing through ideas on how to provide extentions to JTS to provide attribute support...
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James Macgill
jrmacgill
Mar 4, 2002 12:27 pm
... I'm not a JTS coder, but I have been working on the same idea as you so I'll throw in a few comments. First off, I have ported the PROJ library into Java...
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mbdavis@...
Mar 12, 2002 9:05 pm
... In fact the Coordinate class exposes the x,y,and z values as public, so you can change them by simply assigning to them. Now, as James Macgill points out,...
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Aleksandar Milanovic
risjak
Mar 12, 2002 9:12 pm
Perhaps it would be possible to provide both mutable and immutable geometry classes. A Java analogy: String is immutable, StringBuffer is mutable. Should we...
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mbdavis@...
Mar 12, 2002 9:29 pm
Providing mutable classes which extend the Geometry class hierarchy would be one way of doing this. They would have setCoordinate() and setSRID() methods. ...
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Aleksandar Milanovic
risjak
Mar 12, 2002 10:02 pm
Ok. How about making that flag settable only in the constructor? I think that if you can change this flag at any time, then you may as well have only mutable...
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mbdavis@...
Mar 12, 2002 10:13 pm
What I was thinking is that the switch from mutable to immutable would be one way. So someone like Andy could work with a Geometry for a while, altering its...
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James Macgill
jrmacgill
Mar 13, 2002 10:33 am
We have just finished a first shot at adding area and perimeter calculations for JTS geometries in geotools2. One aspect that is of interest is how best to...
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mbdavis@...
Mar 13, 2002 5:32 pm
James, my take on this is that area & perimeter should be calculated to full precision, just as you're doing. Two reasons: - We can't know enough about what...
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Adrian Custer
acuster@...
Mar 13, 2002 6:31 pm
Hey all, In discussions around gnumeric (a spreadsheet project) we ran into this issue. If you consider significant digits you rapidly end up with a ...
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mbdavis@...
Mar 21, 2002 9:31 pm
The JTS Web site has been updated with some Case Studies illustrating the use of JTS. Currently available is: Case Study: Validation of Very Large Polygons ...
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mbdavis@...
Mar 26, 2002 5:18 pm
Hi, Rupert. The compiled versions of the TestBuilder and the TestRunner are provided with the JTS distribution, as separated jar files. We didn't include the ...
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mbdavis@...
Apr 2, 2002 9:37 pm
JTS Version 1.1 has now been released, and is available for download from the JTS Web site: http://www.vividsolutions.com/jts/jtshome.htm This version...
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Hisaji ONO
hi-ono@...
Apr 3, 2002 12:05 pm
Hi. Is there any library to convert from ArcView shape file to WTK and vice versa?. Thanks....
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Frank Warmerdam
nfwarmer
Apr 3, 2002 1:53 pm
... Hisaji, My OGR library will read Shapefiles, and has a call to turn the geometry into WKT. See http://gdal.velocet.ca/projects/opengis/ Best regards, -- ...
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Hisaji ONO
hi-ono@...
Apr 3, 2002 4:09 pm
Thank you very much for you info and program. I could convert shape files into WKT by OGRINFO. Regards....
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Paul Ramsey
pramsey@...
Apr 3, 2002 4:22 pm
There is some rough-and-ready code in the shp2pgsql converter for PostGIS, although the attribute handling code would have to be pared out. ... -- __ / ... \_...
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andyturk
Apr 4, 2002 3:24 am
I just pulled down 1.1 and saw the setSRID() method. Cool! :-) While compiling against the new release I got several errors relating to the TopologyException...
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andyturk
Apr 4, 2002 3:55 am
If you've been writing GIS code with JTS (like I have) the lifetime of your Geometry objects is probably fairly short. They come out of the database, get...
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andyturk
Apr 4, 2002 4:47 am
I recompiled the source in order to get TopologyException into the .jar file. Using the compiler with J2SE 1.4, I found that the following files had incorrect...
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Paul Ramsey
pramsey@...
Apr 4, 2002 3:25 pm
Andy, If by 'database' you mean PostGIS, check out the latest CVS version, which has internal support for proj4 reprojection. That way you can get your objects...
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andyturk
Apr 4, 2002 5:41 pm
... version, ... can get ... with. ... Actually, I *am* using PostGIS with reprojection. :-) I realized after I posted last night that I can probably use that...
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mbdavis@...
Apr 4, 2002 9:01 pm
Andy, I understand your desire to make manipulating JTS geometrys as efficient as possible, and I can see that your proposed scheme would work nicely with...
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andyturk
Apr 5, 2002 1:30 am
... Nope, no hard data. In fact, you could be right that there really isn't any penalty. Even if there was a penalty, it might not occur in a sufficiently wide...
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Cameron Shorter
cshorter@...
Apr 5, 2002 7:39 pm
... I heard an interested talk a few years back on the hardware developments, and how that should effect programming decisions. One of the issues addresses was...
