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I am working on a data set and coordinates are supposed to be in DHDN Bessel 1841. Have a look here: https://www.pegelonline.wsv.de/gast/stammdaten?pegelnr=2330013

I created a shapefile with the cordinates. But I need to define the projection. I am using qgis and when I checked DHDN options, there were a lot like DHDN/ Gauss-Kruger 2,3,4,5 or DHDN/ 3-degree gauss zone 1,2,3,4,5. I am confused which one to use.

Some insight will be of great help.

Thanks

NS

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2 Answers

You may want to look at the EPSG Geodetic Parameter Dataset in its online registry form. You can search DHDN and see what projected coordinate reference systems are based upon it. Some quick notes. The first set you listed are 6-degree wide zones. The 2nd set are 3-degree wide zones. The listed coordinates are probably in northing,easting order. That implies to me that it's zone 3, but whether the 6- or 3-degree is the question. Northing values should be around 5million.

Disclaimer: I'm on the subcommittee that maintains the registry.

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Yeah. Cordinates are northing-easting and northing values are around 5 mil. But still 6-degree or 3-degree? Also, thanks a lot for the link. But it shows different systems, how do I know which one is mine? –  Naresh Jul 26 '11 at 11:43
    
You (and I) can only made educated guess without further information. One way is to somehow find lat/lon coordinates for the point. Another way is to assume the point is in a coordinate reference system, convert it to lat/lon. Is the lat/lon correct? If no, try another coordinate reference system. –  mkennedy Jul 26 '11 at 14:18
    
smart thing ... will try that ..Thanks a lot. –  Naresh Jul 27 '11 at 13:58
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The "pegelnummer" has changed and now might be moved to https://www.pegelonline.wsv.de/gast/stammdaten?pegelnr=23300130

On the site, you read:

Koordinate (Gauss-Krüger 3, Bessel 1841, DHDN)  Rechtswert: 3.389.712,75; Hochwert: 5.286.907,74

This is EPSG:31467, which has always Eastings starting with 3. The 6-degrees Gauß-Krüger projections were not used in Germany under the name of DHDN. There are some other DHDN systems listed too, but all have identical projection definition strings.

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