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Project transform from ETRS89 / ETRS-LAEA to UTM WGS84

Anna

Hello,
I am facing some difficulties with the projection trasform from ETRS89 / ETRS-LAEA to UTM33WGS84.
There is anybody which has the same problem, or someone who can help me,please?
thank you
Anna

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MelitaKennedy

Hello,
I am facing some difficulties with the projection trasform from ETRS89 / ETRS-LAEA to UTM33WGS84.
There is anybody which has the same problem, or someone who can help me,please?
thank you
Anna

Hi Anna,

What kind of difficulties are you having? Is the data vector or raster (if raster, what format?)? What ArcGIS version are you using? Some LAEA data uses a sphere rather than an ellipsoid/spheroid which if the metadata isn't correct can cause problems when the data is reprojected.

Melita

KarlHennermann

Same here: ArcGIS does not project correctly between ETRS-LAEA and WGS84
ArcGIS Desktop (ArcView) 9.3.1 SP1, on Windows Vista

To verify the problem:
go to http://www.eea.europa.eu/data-and-maps/data/urban-atlas and download the file it010l_catania.zip. This covers the town of Catania in Sicily, Italy, at aprox. 15.1E / 37.5N
The data comes in an Lambert Azimuthal Equal Area projection on ETRS89.
I project this into WGS84, using the ArcGIS project tool. The process succeeds without error or warnings. However, the result lies at about 4.2E / 14.4S. This is definitely wrong.

I also project the dataset into WGS84, using QuantumGIS. The result lies at about 15.1E / 37.5N. This is correct.

I submitted this as a support case to our local distributor, ESRI UK. Will post solution.

MelitaKennedy

Same here: ArcGIS does not project correctly between ETRS-LAEA and WGS84
ArcGIS Desktop (ArcView) 9.3.1 SP1, on Windows Vista

To verify the problem:
go to http://www.eea.europa.eu/data-and-maps/data/urban-atlas and download the file it010l_catania.zip. This covers the town of Catania in Sicily, Italy, at aprox. 15.1E / 37.5N
The data comes in an Lambert Azimuthal Equal Area projection on ETRS89.
I project this into WGS84, using the ArcGIS project tool. The process succeeds without error or warnings. However, the result lies at about 4.2E / 14.4S. This is definitely wrong.

I also project the dataset into WGS84, using QuantumGIS. The result lies at about 15.1E / 37.5N. This is correct.

I submitted this as a support case to our local distributor, ESRI UK. Will post solution.

Hello,

Thank you very much for providing a link to some data. The minute I looked at the .prj file I was able to figure out what was happening. The .prj file is using these projection parameters:

latitude_of_center
longitude_of_center

ESRI software expects

latitude_of_origin
central_meridian

The "center" parameters aren't recognized as corresponding to latitude of origin and central meridian, so internally these two parameters have values of 0,0. That's why the longitude values are around 4E and the latitude values are around 14S.

I've attached a .prj file (renamed .txt so it can be uploaded) with the ESRI version of ETRS-LAEA. Please redefine the data with that coordinate system, and I think you will find it working much better.

Another issue is that we use different names in the ETRS 1989 definition which triggers "these are not the same".

I hope this is useful,
Melita

ETRS 1989 LAEA.txt.zip

KarlHennermann

Thanks Melita, this is brilliant! ESRI UK have not come back to me yet, I will point them to this solution.
Regards
Karl

OndraRuzicka

Thanks Melita!
Works like charm also for converting to S-JTSK (Czech Republic).

Ondra

MarcinKasica

Hi,
I have a similar problem but different orientation...
How can I convert WGS 1984 to ETRS 1989?
When I'm opening "project" option the only possibility which can be chosen is to convert ETRS to WGS, even when initial projection is WGS. Does anybody know how it can be done?
Thank's a lot!

MelitaKennedy

Hello!

A transformation is always defined in a certain direction. All supported transformation methods (algorithms) are inversible. The software will apply a transformation correctly no matter which direction it should be applied.

Melita

ClaireBreslin

Hello,

I have a query about going from Irish Grid (IG) to LAEA.

Specificially, this version of LAEA: http://georepository.com/projection_19986/Europe-Equal-Area-2001.html

In ArcGIS 10.1 there are five different options of going from Irish GRID (IG) to LAEA. The results from the different transformations are not consistent with each other, and furthermore these differences vary across the country (Ireland).

A similar issue occurs with transformation from WGS84 to LAEA (where in 10.1 there are about twenty options). In 10.0, three options are available (unknown/on the fly, TM65_To_ETRS_1989_1 and TM65_To_ETRS_1989_NTv2 , depending on if you have a prj file associated with your source file and if you have the NTv2 installed) again resulting in deviations in outputs of up to 70m.

Naturally, deviations are to be expected from the different transformations, but as we do not have any reference data in LAEA to
check this data against, could ESRI Inc advise on which transformation should be used (IG to LAEA, WGS84 to LAEA), in 10.0 and in 10.1 and if available, provide an accuracy statement for the recommended transformations?

I assume the initial part of the step will be to use the NTv2 Ireland transformation which has been created by Esri, which I have attached.

Many thanks,
Claire

ireland_NTv2.zip

SofieWikberg1

Hi!

I have downloaded the bioregions of Europe from http://www.eea.europa.eu/data-and-maps/data/biogeographical-regions-europe-1#tab-gis-data
together with the Esri-friendly Coordinate reference system provided under additional information.

I am now trying to put that ontop of a map of Sweden in Sweref99 TM.

But no matter how I try to project it, the coastline of Sweden is 20 m off to southwest in the ETRS-data. How should I do it?

All the best,
Sofie

EmilyRall

Hi,
I downloaded a vector file from the Urban Atlas dataset (http://www.eea.europa.eu/data-and-maps/data/urban-atlas) and am trying to convert from LAEA/ETRS89 to WGS84 using ArcMap 10.0. I have tried using the project tool in ArcMap and changing the coordinate system in ArcCatalog but keep getting error messages and am unable to change the projection. I also saw your solution to a similar problem (below) and tried adjusting the specifications according to the file you uploaded, but keep getting the same error message of "Failed to alter the spatial reference". Any insight?

Hello,

Thank you very much for providing a link to some data. The minute I looked at the .prj file I was able to figure out what was happening. The .prj file is using these projection parameters:

latitude_of_center
longitude_of_center

ESRI software expects

latitude_of_origin
central_meridian

The "center" parameters aren't recognized as corresponding to latitude of origin and central meridian, so internally these two parameters have values of 0,0. That's why the longitude values are around 4E and the latitude values are around 14S.

I've attached a .prj file (renamed .txt so it can be uploaded) with the ESRI version of ETRS-LAEA. Please redefine the data with that coordinate system, and I think you will find it working much better.

Another issue is that we use different names in the ETRS 1989 definition which triggers "these are not the same".

I hope this is useful,
Melita

MelitaKennedy

Looking for a smallish dataset, I downloaded the Badajoz one. There's something in the WKT of the coordinate reference system that we're having trouble understanding, so it comes in with an unknown coordinate system. Use the define projection tool, or the data's property page in ArcCatalog to change it to projected coordinate systems, continental, europe, ETRS 1989 LAEA. Then you should be able to reproject it with the Project tool or on the fly in ArcMap.

(no time to check what's the problem right now; will try tomorrow)

Melita

EmilyRall

Hi,
Thank you for the quick reply. I tried changing the coordinate system as suggested using the define projection tool and in ArcCatalog using the properties feature but neither worked--I got the same error message.

NeilAyres

Check the file permissions of the data using the normal windows file explorer.
Either the data itself or the directory it is in is probably set to "read only".
Good luck,
Neil

EmilyRall

Check the file permissions of the data using the normal windows file explorer.
Either the data itself or the directory it is in is probably set to "read only".
Good luck,
Neil

Hi Neil,
That was the problem. Thanks so much to you and Melita both!!!
-Emily

SophiNeuner

Hello!

The discussion is quite old but i have a similar problem. I try to project from WGS_1984 to ETRS_1989 but i always get error "000365 : Invalid geographic transformatin" and error 000361.

Can someone give me a hint? Thank you!

000365

SophiNeuner

Hello!

The discussion is quite old but i have a similar problem. I try to project from WGS_1984 to ETRS_1989 but i always get error "000365 : Invalid geographic transformatin" and error 000361.

Can someone give me a hint? Thank you!

Bests,
Sophi

MelitaKennedy

Hi Sophi,

That often means that we don't recognize the coordinate system (spatial reference) of the input data. For instance, there a different name or a value is not quite the same. Try redefining the coordinate system using the Define Projection Tool or the data's property page in ArcCatalog.

Could also occur if you're not directly using the coordinate systems folder to pick the output coordinate system but importing it from other data or a file.

Melita

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