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Hi Jeanne Thank you very much for your reply. Sorry that I didn't get back to you before. I didn't get an email notification, so I didn't realise you had replied. Unfortunately I don't think the geodesic ellipse method will do what I want, but I appreciate you taking the time to respond. Best wishes, Sharon
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10-22-2014
03:04 AM
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Hi Jeanne Thanks very much for your reply. I've seen the Qt sample app and the Geometry examples but I don't think they do what I need. I've been reading up on this a bit so I'll add some more info here in case it helps anyone else trying to solve the same problem. There's a useful Wikipedia page here: Geodesics on an ellipsoid - Wikipedia, the free encyclopedia. It looks like there are two different problems which are typically solved: - the direct geodesic problem: given a start point, the azimuth at that point and a geodesic distance, find the corresponding end point; - the inverse geodesic problem: given start and end points, find the geodesic distance between them and the azimuths at those points. I'm trying to solve the direct geodesic problem and I think maybe the methods in the ArcGIS Runtime SDK for Qt only solve the inverse problem. However, I may well have missed something here so I'd appreciate you letting me know if there is a method that solves the direct problem that I haven't seen yet. Thanks very much, Sharon
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09-10-2014
03:31 AM
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I've now realised why I was unable to do what I wanted. I was trying to plot a geodesic line corresponding to a specified bearing but actually this doesn't make sense because geodesic lines are not the same as lines of constant bearing (loxodromes). I think what I actually need to do is to plot a geodesic which has a given angle of bearing at a given point - i.e. to answer the question 'if I receive a signal from a given direction, where might it have come from?'. Does anyone know how to do that?
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09-09-2014
01:33 AM
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In fact I've now played with GeometricEngine::createGeodesicSector() a bit more and it doesn't seem like it will do what I want, so I'd be grateful for any suggestions anyone has.
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09-08-2014
08:09 AM
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Hi Please can anyone give me advice on how to plot geodesic (great circle) lines? I'm aware I could use GeometryEngine::geodesicDensifyGeometry() to get points on a geodesic line between two predefined locations, but what I need to do is to plot a line using a starting location, angle of bearing and line length. I think perhaps GeometricEngine::createGeodesicSector() could do this for me but I'm not sure how to set all the parameters. I'd appreciate it if anyone who has experience doing this could give me some hints. Thanks very much, Sharon
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09-08-2014
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I've now managed to get round this by building Qt and then QtCreator from source, following the instructions given here: http://doc.qt.digia.com/qtcreator-extending/getting-and-building.html. QtCreator can then be associated with the version of the Qt libraries supplied by ArcGIS, by following the instructions here: https://developers.arcgis.com/qt/guide/install-and-set-up-on-linux.htm.
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06-06-2014
06:20 AM
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Hi I'm trying to follow the instructions to set up ArcGIS SDK on 32 bit RHEL 6.5 which are given here: https://developers.arcgis.com/qt/guide/install-and-set-up-on-linux.htm. I have installed the latest version of QtCreator using the qt-creator-opensource-linux-x86-3.1.1.run file downloaded from http://qt-project.org/downloads. However, when I try to run QtCreator I get the following error: Failed to load core: /home/user/Qt5.1.1/Tools/QtCreator/lib/qtcreator/plugins/QtProject/libCore.so: Cannot load library /home/user/Qt5.1.1/Tools/QtCreator/lib/qtcreator/plugins/QtProject/libCore.so: (/usr/lib/libstdc++.so.6: version `GLIBCXX_3.4.15' not found (required by /home/user/Qt5.1.1/Tools/QtCreator/lib/qtcreator/plugins/QtProject/../.././libQt5CLucene.so.5) I have searched forums and tried several approaches to fixing this. I have tried updating glibc using the following rpm: glibc-2.12-7.2.src.rpm. I have also tried updating gcc to version 4.7 by installing the Red Hat Developer Toolkit but I still do not have a version of libstdc++ containing GLIBCXX_3.4.15 (the highest version number I have is GLIBCXX_3.4.13). The next thing I am considering trying is to build QtCreator from source. The problem I have is that this requires private headers from the Qt library (as explained here: http://doc.qt.digia.com/qtcreator-extending/getting-and-building.html) so Qt should be configured with the -developer-build option. However I do not want to rebuild the Qt libraries because I want to use the version supplied by ArcGIS. I'd be grateful if anyone has suggestions as to the best thing to do. Thank you! SB
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06-06-2014
01:23 AM
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