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| GeoCommunity Mailing List |
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| Mailing List Archives |
| Subject: | [gislist] Contouring in Spatial Analyst 9.1? |
| Date: |
11/28/2006 01:15:00 PM |
| From: |
Smith, Travis |
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Hi Listers,
Is there anyone out there with considerable experience in generating
contours from XYZ point files? If so, could you please contact me?
I have successfully generated some contours using the
'Features_to_Raster' and 'Contour' commands, but would like to know how
to maximize this process. I am specifically interested in the following:
1). My input source dataset has the following parameters:
*LIDAR point data (converted to Shapefile format)
*Posting interval: 1m
*Vertical accuracy: 0.15m
*Horizontal accuracy: 0.45m
I would like to know how to figure out the densest contour interval I
can accurately generate from this?
2). Upon using the 'Features_to_Raster' and 'Contour' commands in
Spatial Analyst 9.1, the user is required to complete each of the
following properties:
*Output Cell Size (upon converting the Shapefile points to a Grid): What
exactly is this? Why does SA 9.1 generate a default value? How can a
user find out how to maximize this property?
*Contour Interval: This seems to be straightforward, referring to the
interval the user would like to generate.
*Base Contour: Any idea what this is referring to?
*Z Factor: Any idea what this is specifically referring to in regards to
the Z (elevation) value? How will/does this effect the resulting
contour?
3). Finally, how can a user find out what algorithm(s) is being used in
each of these modeling processes ('Feature_to_Raster' and 'Contour')?
Thanks very much for any knowledge you can offer,
Travis
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