Projektion Problem

[S_R_]

Hello Everyone,

i have a (maybe real simple) Problem. I want to add Point Data using X/y-Coordinates based on two different excel-tab. As a basement-layer i use official Data UTM Zone 32 (25832). The first adding is no Problem, die x/y Data is given in N and E collum with Values like:

N	E
2689100	4337000
2689100	4341100
2690800	4341200

The Documentary says the Data is given in ETRS_1989_LAEA (3035) and its working fine. The second tab now has x/y Data given in that form:

N	E
4404927,43	5539801,47
4370697,91	5544504,58
4373924,39	5547811,9

I checked the coordinates using web-tools and the point where located at the right spots using Gauss_Zone_3 (31467). But when i want to add this x/y-Data to my projekt there is always a significant cutoff between my first und the secound data:

I tryed also different Projektions/Systems but the results stayed the same. Anyone has a idea how to fix this Problem? (iam using ArcGIS 10.5)

Best Regards,

Sebastian

[ChristaVinnemann · Accepted solution]

Hi Sebastian,

your second data source is in "DHDN 3-Degree Gauss Zone 4" with the EPSG authority 31468. And it's really important to use the transformation "DHDN_To_ETRS_1989_8_NTv2" for correct projections!

Cheers

Christa

[S_R_]

It worked, thank you Christa.

Just as aditional Information: witch transformation should i use for the first x/y-Dateset to get the same results? There is a slide difference between them

[ChristaVinnemann]

“Projection on the fly” doesn’t work accurate! The best way is to project both sources by using the project tool into ETRS_1989_UTM_Zone_32N (EPSG 25832). Because of the differences between the basic geoids the points will have retain an inaccuracy about 70 – 120 meter.

Von: S. R.

Gesendet: Dienstag, 4. September 2018 17:28

An: Vinnemann, Christa <Christa.Vinnemann@bgr.de>

Betreff: Re: - Re: Projektion Problem

GeoNet <https://community.esri.com/?et=watches.email.thread>

Re: Projektion Problem

reply from S. R.<https://community.esri.com/people/seb.ra?et=watches.email.thread> in Coordinate Reference Systems - View the full discussion<https://community.esri.com/message/796694-re-projektion-problem?commentID=796694&et=watches.email.thread#comment-796694>

[MelitaKennedy]

Christa Vinnemann‌ Projection-on-the-fly for vector data uses the same functions and settings as the Project tool. For rasters, they use zoom-level / map scale to adjust the on-the-fly projection. If you change the map scale or zoom level, the algorithm will adjust. 

S. R.‌ What coordinate system if the map using? You can try other DHDN / ETRS89 transformations. Try #3 which is used in your area of use.

Melita