1

i'm trying to convert some *.xyz files into shapefiles but unfortunately it does't work out correctly! I use the tool "ASCII 3D to Feature Class" (ArcMap extension "3D Analyst") because I've read this is a good and easy way to do this. But for some reason the attribute table of the resulting shapefile does not contain the z-values:

attribute table

This is a problem because I want to generate a DTM out of the shapefiles.

Is there any solution for this? I've tried several options within the tool but without luck.

I don't think it's that important but for your information: I have two different kind of *.xyz files which I can use representing the same area (2 meter grid width and variable grid width). they are build like this:

variable grid width: (no header) - (2x space)x-value(4x space)y-value(5x space)z-value

2 meter grid width: (no header) - (2x space)x-value(2x space)y-value(2x space)z-value

  • 2
    Check if Z-value embedded in shape, start editing and see if vertex has Z attribute in addition to XY – FelixIP Nov 10 '14 at 19:21
  • The Z values are stored in the shape.You can examine the features in ArcScene. There is no need to add a field in the the attribute table altough you can do that if you'd like: Arc Toolbox -> Data Management Tools -> Add XY Coordinates. This tool will add XYZ fields to the attribute table. – Jakub Sisak GeoGraphics Nov 10 '14 at 20:18
  • 1
    Felix is correct, with Multipoint, the Z and M values are stored per-vertex, of which there may be thousands per multipoint feature, which is an aggregate geometry type. If you want to have Z values in the attribute table, use Point, not Multipoint, and then use Dan's answer to add the Z values to the table. – blah238 Nov 11 '14 at 6:20
2

As FelixIP said in the comments, the Z values should be in there: the "Z" in the Shape type of "Multipoint ZM" indicates that your layer is z-enabled, so if you did the conversion from .XYZ to Shapefile correctly, your Z values are in there. It's just that Z values don't show up in a feature's attribute table by default, you need to add them manually. You can use the 3D Analyst Add Z Information tool to do that if you want to check your data, but any of the ESRI tools which operate on Z values should work fine with your shapefile the way it is.

  • 1
    Multipoint is an aggregate geometry type, in which many thousands of vertices (points) are stored per row (multipoint). So it will not be possible to extract each Z value without first converting to Point. – blah238 Nov 11 '14 at 6:23

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.