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Simply? getting Z values into attribute table

DataSteward

This should be really simple and I'm surprized that an hour of looking through the forums and other support hasn't turned up an answer for me yet. Am I just being blind?

I have a shapefile of 3D points, and I want to fill a field in the attribute table with the Z values. Calculate Geometry does not offer Z coordinate options. So I've tried using the Field Calculator with

[INDENT]Dim Output As Double
Dim pPoint As IPoint
Dim pZAware as IZAware
Set pPoint = [Shape]
Set pZAware = pPoint
pZAware.ZAware = true
Output = pPoint.Z
[/INDENT]

(and variants thereof)

But all I get for output is the value '1'

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EricRice

Eric,

The Add XY Coordinates tool will add POINT_Z and POINT_M fields when the input feature is z- and m-enabled. It's located in Data Management Tools > Features. If you don't want the X, Y fields you can delete them and keep just the Z.

In ArcGIS 10, the Calculate Geometry has the option to get the Z for a point dataset.

I tested your code sample and it worked fine for me so there is nothing wrong with that. What does your dataset say in the Shape field? And how did the data get the Z values originally?

Regards,
Eric

DataSteward

"Add XY Coordinates" did the trick!

I'm at version 9.3.1 - looking forward to 10. My shape field reports "Point ZM". The file originated as a CSV with XYZ values, turned into a shape file with "ASCII 3D to Feature Class". My code may remain a mystery, but the overall problem is solved.

Thanks!

Kostas

well i have the same problem i tried but i am getting only x,y coordinates, i am using 10.2.2.

XanderBakker

You could use the python syntax and write:

!Shape!.firstPoint.Z

More examples here: ArcGIS Help (10.2, 10.2.1, and 10.2.2)

Kostas

very usefull! any suggestion if i want to create a line with a start and end point which is not drawn at the terrain but as a chord, to get after that the z values?

AdrianWelsh

I'm late to the party but this tool in Pro works great!

Add Geometry Attributes—Data Management toolbox | ArcGIS Desktop

NigelBaker

I have the same type of problem and simply cannot believe that this is still an issue.

I have gps data which i have extracted from photo metadata and converted to .kmz using geosetter.

I import this data using the kmz to layer tool and then save the points to a shapefile.

if i select a point the coordinates of the point are shown in the pop-up window in full with x, y and z (altitude).

then i tried both the 'Add XY Coordinates' tool which returned a 0 for all the z values and the 'add geometry attributes' tool which returned a 'null' for all the z values. the XY coordinates were written correctly.

what is the deal? it is 2019, we live in a 3D world. why is this so difficult?

please!

AdrianWelsh

Nigel Baker

Maybe first try converting these features to 3D:

Feature To 3D By Attribute—Help | ArcGIS Desktop

Then try getting Z values.

NigelBaker

Hi,

Thanks for the tip.

However that tool requires that you have an attribute field for the Z component.

I do not have this… kinda the point of this whole thread!

When I try to generate Z coordinates using update coordinates or some other tool all I get are zeros or nulls.

So either I try this tool before generating the false Z values; and the tool doesn’t run… or I try it after generating the Z field full of zeros and the 3D features are tied to the ground…

Or was there some other way to get the necessary Z values so that this tool can work?

AdrianWelsh

I am not sure without trying it myself. I personally would extract the exif data from the photos in order to grab all of the attributes that I would (like x,y, and z), then put those back into the attributes of the point feature.

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