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There are a few different ways you can convert the SHP to an XYZ data file. Our Didger and MapViewer programs have the ability to read the Z value from the DBF file and write out ASCII XYZ. So some options include:

1. Using Didger for the conversion. Import the SHP file into Didger, setting the Z value as the Primary ID. Then use File | Export to export to a DAT file.

2. Using MapViewer for the conversion. Import the SHP file into MapViewer, setting the Z value as the Primary ID. Then use File | Export to export to a DAT file.

3. Using Arcv2CAD to convert the SHP to DXF, and then using DXF2XYZ to convert the DXF to an XYZ file.

4. You can import the SHP as a base map in Surfer, turn off the axes, and export it to a BLN file. Open the BLN file in the Surfer worksheet, remove the BLN headers (a 1-line header with the number of data points in column A and a 1 in column B), and then add the elevation data from the DBF to column C in the worksheet, matching up the correct elevation value with each object or vertex. Depending on how many objects or vertices you have, this could be easy or could be difficult. If you can do this, you can then use File | Save As in the worksheet to save the data to a DAT file for use with gridding.

See Also:
Related KB Question: How can I convert a 3D SHP file to an XYZ or GRD file using Didger 4?