[PATCH] Add Hungarian EOV projection and GRS67 ellipsoid

[BathoryPeter]

Additionally I've enabled ClarkeIGN in Projections.java and corrected flattening parameter of Bessel ellipsoid.

Hungarian HD72 / EOV proj4 parameters are from here: ​http://mercator.elte.hu/~saman/hu/okt/ol/
because of ​http://spatialreference.org/ref/epsg/23700/ writes a bad one.

[simon04]

bastiK, any concerns with applying this patch? I'd add a note in data/epsg that the parameters originate from ​http://mercator.elte.hu/~saman/hu/okt/ol/.

[BathoryPeter]

Replying to simon04:

bastiK, any concerns with applying this patch? I'd add a note in data/epsg that the parameters originate from ​http://mercator.elte.hu/~saman/hu/okt/ol/.

Good idea, but how can we add note to epsg file? As I can see "#" marks the name of projection.

[Don-vip]

Putting the note in the SVN commit message would be OK for me.

[bastiK]

In 6463/josm:

applied #9407 - Add Hungarian EOV projection and GRS67 ellipsoid (patch by BathoryPeter)

[bastiK]

Replying to Don-vip:

Putting the note in the SVN commit message would be OK for me.

Sorry, forgot to put it in the commit message, but hopefully whoever needs to know will find this ticket.

Replying to simon04:

bastiK, any concerns with applying this patch?

It's fine, but I removed the "+datum=HD72" property because it is redundant and not defined anywhere. In addition I reverted the change to Bessel1841 as no reason or source was given.

[simon04]

The changed value for Bessel 1841 is written on ​https://en.wikipedia.org/wiki/Bessel_ellipsoid, but no source is given on that page neither.

[BathoryPeter]

• Corrected HD72 > WGS84 conversion based on a newer publication: G. Molnár–G. Timár, "Determination of the parameters of the abridged Molodensky formulae providing the best horizontal fit" (​http://www.fomi.hu/honlap/magyar/szaklap/2004/04/2.pdf)

• More precise GRS67 flattening parameter (source: epsg.org)

[bastiK]

​This site seems to have Bursa-Wolf parameters with better maximum error. It references ​a publication by the same authors.

[BathoryPeter]

Replying to bastiK:
You are right, Bursa-Wolf parameters are exist for HD72.
As biggest GIS softwares (Postgis, QGIS, Proj4) uses 3-parameter form (with corrected parameters), for better interoperability, Hungarian OSM community suggest to use the same definition.

[bastiK]

In 6974/josm:

applied #9407 - fix for Hungarian EOV projection (patch by BathoryPeter)

[bastiK]

In 6975/josm:

see #9407 - remove unnecessary zeros

[bastiK]

Replying to BathoryPeter:

As biggest GIS softwares (Postgis, QGIS, Proj4) uses 3-parameter form (with corrected parameters), for better interoperability, Hungarian OSM community suggest to use the same definition.

Sounds reasonable.

[stoecker]

Milestone renamed