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| GeoCommunity Mailing List |
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| Mailing List Archives |
| Subject: | Re: [gislist] contours as polygons |
| Date: |
11/10/2005 05:55:01 PM |
| From: |
Bryan Keith |
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Two folks replied suggesting an ArcInfo tool for converting lines to
polygons. However, contours often continue to the extent of the input
dataset and end there, and this tool does not convert non-closed lines
to polygons. As noted, it doesn't attribute either. This tool does
solve the somewhat tricky donut problem so a person could
1 - contour the surface
2 - add a bounding box line at the extent of the surface
3 - use ArcInfo tools to create polygon topology from the lines (Create
Features doesn't seem to be the correct tool, but CLEAN would work)
4 - query the surface at point(s) inside each polygon and attribute the
polygon based on the results of the query and information sent to the
contouring algorithm
I suppose this process would work, but it requires an ArcInfo license
(for CLEAN) and isn't very elegant. Other ideas?
Bryan
Tripp Corbin wrote:
>If you have ArcEditor or ArcInfo, you can use the create features tool
>found on the topology toolbar to generate the polygons. The problem will
>then be attributing the polygons. I can think of a couple of several
>step intensive ways to do that involving buffers and such but no quick
>easy way comes to mind.
>
>Tripp Corbin, MCP, GISP
>Associate Vice President, GIS/Mapping
>ESRI Authorized Instructor
>Keck & Wood, Inc.
>www.keckwood.com
>(678) 417-4013
>(678) 417-8785 fax
>
>Keck & Wood now offers both Instructor led and virtual training classes
>for ESRI's ArcGIS & ArcView software. Contact me for more information.
>
>Currently scheduled Instructor led classes:
>Introduction to ArcGIS I - October 25-26 in Thomasville, GA
>Introduction to ArcGIS II - November 9-11 at the SHRUG Workshop in
>Tallahassee, FL
>
>
>
>I have a number of different tools to create contours as lines from a
>surface. Does anyone know of a tool or have some code that will create
>polygons instead of lines when contouring a surface? Each polygon would
>represent the area between n1 and n2. I have the ConRec code and
>thought about writing this myself, but it gets complicated with donut
>polygons. I bet someone's done this before. Maybe there's a better
>mailing list for this question? Thanks.
>
>Bryan
>
>Bryan Keith
>GIS Specialist
>Geomega, Inc.
>Boulder, CO, USA
>
>
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