topic Re: Displaying two reference grids in one map (Layout view) - UTM reference grid is incorrect - Why? in Coordinate Reference Systems Questions

Displaying two reference grids in one map (Layout view) - UTM reference grid is incorrect - Why?

KarinHeiland — Mon, 08 Jan 2018 09:29:29 GMT

Hello,

we need to display two coordinate systems as a reference grid in our maps: RD/83_GK_Zone4 and ETRS89_UTM_Zone32N. The layout is shown in the picture below also including a verification point. The GK grid is displayed correctly but the UTM grid is incorrect. There is a shifting as you can see comparing the coordinates of the verification point with the grid coordinates.

Does anyone has an idea how to solve that problem? It seems that just the displayed UTM reference grid is incorrect. The location is in Saxony-Anhalt.

Thanks for your help!

Re: Displaying two reference grids in one map (Layout view) - UTM reference grid is incorrect - Why?

DanPatterson_Retired — Mon, 08 Jan 2018 09:37:57 GMT

Have you confirmed the datum for each? A different datum or an improperly defined datum can account for a shift.

I don't know what datum options you have there, but I do know that UTM has a number of datum references

Re: Displaying two reference grids in one map (Layout view) - UTM reference grid is incorrect - Why?

KarinHeiland — Mon, 08 Jan 2018 09:54:55 GMT

The datum for RD/83_GK_Zone_4 is defined as D_Rauenberg_1983 and for ETRS1989_UTM_Zone32 it is D_ETRS_1989. It is automatically defined after choosing the coordinate systems. do you think there is a transformation problem? but i'm actually not sure how the transformation works when displaying two different reference grids..

Re: Displaying two reference grids in one map (Layout view) - UTM reference grid is incorrect - Why?

DanPatterson_Retired — Mon, 08 Jan 2018 10:27:06 GMT

If you were in North America, I would have an answer but if you were given an option of a datum transformation and were offered one, you should use it. I don't know what applies in your case. A datum essentially describes the shape of earth at a point in time meaning that if the parameters used to describe its shape globally or locally change, then the coordinate values for a location must change if the object doesn't move. You will have to investigate this further on your end, or I will flag MKennedy-esristaff‌ for some definitive help.

Re: Displaying two reference grids in one map (Layout view) - UTM reference grid is incorrect - Why?

KarinHeiland — Mon, 08 Jan 2018 12:08:29 GMT

Thanks you for your help. I suppose it's an ArcGIS problem. For my dataframe I defined the RD/83_GK_Zone_4 coordinate system - Displaying the RD/83 as a reference grid works fine. But when I display an additional reference grid (UTM) it is incorrect. So I supposed there is a transformation problem between RD/83 and UTM. But reffering to the reference grids I have no further possibilities of adjustement (as far as I think).

But maybe your friend Melita Kennedy has some further information!?

Re: Displaying two reference grids in one map (Layout view) - UTM reference grid is incorrect - Why?

MelitaKennedy — Tue, 09 Jan 2018 23:09:35 GMT

In ArcMap, yes, there's a bug/known limit that the grids and graticule wizard doesn't handle geographic/datum transformations. So a grid or a graticule in a 2nd GCS is not displayed properly. One thing to try is to use the tools instead (Makes Grids and Graticules layer tool in the cartography toolset). They create the grids and graticule differently.....although a Technical Support contact says that doesn't work either. She says you would have to create a second data frame in the other PCS/GCS create it there, then overlay it exactly in the layer frame.

Another possibility is to create the grid with Fishnet tool but then you have to label it yourself.

Re: Displaying two reference grids in one map (Layout view) - UTM reference grid is incorrect - Why?

DanPatterson_Retired — Tue, 09 Jan 2018 23:23:23 GMT

is there a bug number reported for this?

Re: Displaying two reference grids in one map (Layout view) - UTM reference grid is incorrect - Why?

MelitaKennedy — Tue, 09 Jan 2018 23:33:34 GMT

Ask me the hard questions, why doncha? I'm looking for it.

EDIT: Here's the bug: NIM004421

The low number means it was likely ported from the previous bug system, so it's existed for a long time...originally logged in 2005.

Melita

Re: Displaying two reference grids in one map (Layout view) - UTM reference grid is incorrect - Why?

KarinHeiland — Wed, 10 Jan 2018 08:22:29 GMT

Melita, thanks for your information. That was quite helpful. At least, I finally know how to handle it and that it is not a user's mistake.

Karin