[UW-GIS-L] 3D Analyst profile graph problem

[Luke Rogers]

Chris,

You need to interpolate the line first. The profile tool only works with 3d
features. Since your polyline Z is already 3d the profile tool with use
those elevations. Try interpolating first by selecting the line and using
the 3D Analyst tool "interpolate line" on the same toolbar. This will update
the Z values and give you what you want.

-Luke

-----Original Message-----
From: uw-gis-l-bounces at mailman1.u.washington.edu
[mailto:uw-gis-l-bounces at mailman1.u.washington.edu] On Behalf Of
cwayne at u.washington.edu
Sent: Friday, September 08, 2006 4:34 PM
To: uw-gis-l at u.washington.edu
Subject: [UW-GIS-L] 3D Analyst profile graph problem

I feel like I am missing something basic here, but I have been away from 3D
Analyst for a while so apologies in advance:

I have a polyline Z shapefile with 15 features respresenting a boat in
motion (derived from a Trimble GPS track), overlaid on some bathymetry data
of the lake bottom (ESRI GRID).  I want to show the lake depth beneath the
boat track, so I use the profile tool, right, with the bathymetry selected
on the 3d analyst toolbar?  The profile graph that is created shows the Z
values of the polyline (i.e.: the lake surface, great for assessing vertical
precision but...), NOT the values of the bathymetry surface below.

Now, if I draw graphics from scratch using the interpolate line tool, it
works and I get a bathymetric profile.  But if I convert the polylinez
features to graphics, and run the profile, I again get the lake surface
(z-values).

Like I said it seems simple...

Thanks!

Chris Wayne
GIS Instructor
University of Washington
Educational Outreach
cwayne at u.washington.edu



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