[jira] [Commented] (SIS-385) Inaccurate formulas in DistanceUtils
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https://issues.apache.org/jira/browse/SIS-385?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16330284#comment-16330284
]
Martin Desruisseaux commented on SIS-385:
-
Thanks, we will do. My proposal is to replace the {{DistanceUtils}} class and
{{DefaultEllipsoid.orthodromicDistance}} method by something else based on
Wikipedia article and GeographicLib. The API may share some similarity with
{{GeodeticCalculator}} (in particular for the part using ISO standards), but
the formulas under the hood would be the Wikipedia / GeographicLib ones.
For discussion about the use of
[GeographicLib|https://geographiclib.sourceforge.io/], I suggest to use the
SIS-386 thread.
> Inaccurate formulas in DistanceUtils
>
>
> Key: SIS-385
> URL: https://issues.apache.org/jira/browse/SIS-385
> Project: Spatial Information Systems
> Issue Type: Bug
> Components: Referencing
>Affects Versions: 0.1-incubating, 0.2-incubating, 0.3, 0.4, 0.5, 0.6, 0.7,
> 0.8
>Reporter: Martin Desruisseaux
>Priority: Major
> Fix For: 1.0
>
>
> The {{DistanceUtils}} class has the following problems:
> * Inaccurate formula in {{getPointOnGreatCircle}}.
> * Inaccurate formula in {{getHaversineDistance}}.
> * Misnamed {{getHaversineDistance}} method.
> Charles Karney kindly provided descriptions of the problems [on the developer
> mailing
> list|https://lists.apache.org/thread.html/85ba228a3191f2952f2e37caa489f929daffd491da50484972af4aef@%3Cdev.sis.apache.org%3E],
> together with proposed fixes. One possible action is to deprecate
> {{DistanceUtils}} in favor of something like the {{GeodeticCalculator}} class
> [in the Geotk
> project|http://www.geotoolkit.org/apidocs/org/geotoolkit/referencing/GeodeticCalculator.html].
> That class is a port in Java of following Fortran code:
> * ftp://ftp.ngs.noaa.gov/pub/pcsoft/for_inv.3d/source/forward.for subroutine
> DIRECT1.
> * ftp://ftp.ngs.noaa.gov/pub/pcsoft/for_inv.3d/source/inverse.for subroutines
> GPNARC (version 25.26) and GPNHRI (version 200208.09) written by Robert
> (Sid) Safford.
> But we may take another source if suitable, for example
> [https://geographiclib.sourceforge.io/|https://geographiclib.sourceforge.io/].
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[jira] [Commented] (SIS-385) Inaccurate formulas in DistanceUtils
[
https://issues.apache.org/jira/browse/SIS-385?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16328858#comment-16328858
]
Charles Karney commented on SIS-385:
The issue descriptions don't quite match the two complaints I made on the
mailing list. This one was referring to problems with the computations on a
*sphere* (not an *ellipsoid*). Currently the SIS routines are sub-standard
returning results involving arcsine or arccosine which are subject to large
rounding errors in some cases. I recommend following the methodology in the
Wikipedia article, [Great-circle
navigation|https://en.wikipedia.org/wiki/Great-circle_navigation], using the
more accurate formulas (involving atan2) where appropriate.
> Inaccurate formulas in DistanceUtils
>
>
> Key: SIS-385
> URL: https://issues.apache.org/jira/browse/SIS-385
> Project: Spatial Information Systems
> Issue Type: Bug
> Components: Referencing
>Affects Versions: 0.1-incubating, 0.2-incubating, 0.3, 0.4, 0.5, 0.6, 0.7,
> 0.8
>Reporter: Martin Desruisseaux
>Priority: Major
> Fix For: 1.0
>
>
> The {{DistanceUtils}} class has the following problems:
> * Inaccurate formula in {{getPointOnGreatCircle}}.
> * Inaccurate formula in {{getHaversineDistance}}.
> * Misnamed {{getHaversineDistance}} method.
> Charles Karney kindly provided descriptions of the problems [on the developer
> mailing
> list|https://lists.apache.org/thread.html/85ba228a3191f2952f2e37caa489f929daffd491da50484972af4aef@%3Cdev.sis.apache.org%3E],
> together with proposed fixes. One possible action is to deprecate
> {{DistanceUtils}} in favor of something like the {{GeodeticCalculator}} class
> [in the Geotk
> project|http://www.geotoolkit.org/apidocs/org/geotoolkit/referencing/GeodeticCalculator.html].
> That class is a port in Java of following Fortran code:
> * ftp://ftp.ngs.noaa.gov/pub/pcsoft/for_inv.3d/source/forward.for subroutine
> DIRECT1.
> * ftp://ftp.ngs.noaa.gov/pub/pcsoft/for_inv.3d/source/inverse.for subroutines
> GPNARC (version 25.26) and GPNHRI (version 200208.09) written by Robert
> (Sid) Safford.
> But we may take another source if suitable, for example
> [https://geographiclib.sourceforge.io/|https://geographiclib.sourceforge.io/].
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