sis-commits mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Martin Desruisseaux (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SIS-385) Inaccurate formulas in DistanceUtils
Date Thu, 18 Jan 2018 09:20:00 GMT

    [ 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 200005.26) 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/].



--
This message was sent by Atlassian JIRA
(v7.6.3#76005)

Mime
View raw message