Homogenisation

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04-27-2017 02:35 AM
TheresaFurness
New Contributor II

Hi,

I am new to ArcGIS.  I am a bit stuck.  I am adding a 2 layers in ArcMap :

ArcGIS coordinate system

*Type Geographic

*Geographic coordinate reference GCS_WGS_1984

and

*Type Projected

*Geographic coordinate reference GCS_MGI

*Projection MGI_Austria_GK_M31

I cannot see the projected layer - when I Define Projection as MGI, they are both there, but very FAR apart.  Is it the Datum that is incorrect?  How can I correct this?

Thanks in advance

Terri

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Accepted Solutions
JayantaPoddar
MVP Esteemed Contributor

Thank you for the mail. The correct projected Coordinate system for LULC_NAWI is WGS_1984_UTM_Zone_33N.

Go to the Shapefile Properties from ArcCatalog > XY Coordinate System Tab. And define WGS_1984_UTM_Zone_33N as the coordinate system.

PCS

The Project_area and LULC_NAWI will then exactly overlay on each other.

overlay



Think Location

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17 Replies
DanPatterson_Retired
MVP Emeritus

You don't define a projection unless the file is actually in that coordinate system, so check the each layers property to see if it is 'undefined'.  If undefined, then define it.  If the files have a defined coordinate system, but they are far apart, then they have been defined wrong.

If you want two files with a defined coordinate system to be in the same coordinate system, then you use the Project tool, not the Define Projection tool

Define Projection vs Project.... a visual guide

TheresaFurness
New Contributor II

Many thanks, firstly.  They are far apart, so shall try and investigate in ArcCatalog to see which one has been defined wrong

I look forward to reading your blog too, since I am now totally confused!

Terri

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JayantaPoddar
MVP Esteemed Contributor

Could you attach the screenshot showing the spatial extent of the projected layer (Layer Properties > Source tab)?



Think Location
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TheresaFurness
New Contributor II

Hi,

The second layer :

Terri

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TheresaFurness
New Contributor II

Terri

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JayantaPoddar
MVP Esteemed Contributor

Is the data from Austria region? If you could attach a sample data from the projected data, I could have a look at it.



Think Location
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TheresaFurness
New Contributor II

Have emailed it to you.

Thanks

Terri

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DanPatterson_Retired
MVP Emeritus

The first image is definitely in decimal degrees given its extent and its defined projection.

The second image is a strange one, given the extent values for the easting and the northing and the fact that the false northing is an extremely large negative number.  Was that one defined as such already? or did you define it? since the northing values don't jive and given the latitude, I would expect something like a UTM since the northing is about 1/2 way to the N pole

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TheresaFurness
New Contributor II

I am a student of GIS - this was part of an assignment - the data was given incomlete like this to 'make us correct it' - but try as I may, I cannot work out that coordinate system either

Thanks anyway

Terri

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