shrug-l: polygon to point

swl2727@mailer.fsu.edu swl2727@mailer.fsu.edu
Tue, 28 Dec 2004 12:33:28 EDT


I sent a message to some one yesterday with the same info.  There are
ways in workstation that will either correct or avaoid this problem.  

Shawn Lewers

On Tue, 28 Dec 2004 08:31:42 -0500 "Greg Mauldin" wrote:

> Hi All,
> 
> The "outside" centroid is avoided if you use trusty ArcInfo.
> 
> Greg
> 
> Greg Mauldin
> GIS Project Manager
> Tallahassee-Leon County GIS
> Leon County Courthouse
> 301 S Monroe St, Room P313-F
> Tallahassee, FL 32301
> 850.488.8020
> gregm@leoncountyfl.gov
> 
> >>> Alan Foley <AFoley@jea.net> 12/27/2004 5:54:01 PM >>>
> Other users have already provided good methods to use.  I don't know if
> this
> will be a concern for you, but watch out for irregularly shaped
> polygons
> such as flag lots - the centroid may actually fall outside the polygon
> boundary.  
> 
> Alan
> 
> -----Original Message-----
> From: shrug-l-admin@lists.dep.state.fl.us 
> [mailto:shrug-l-admin@lists.dep.state.fl.us] On Behalf Of Dietrich,
> Mark
> Sent: Thursday, December 23, 2004 10:36 AM
> To: shrug-l@lists.dep.state.fl.us 
> Cc: turkeyb99@yahoo.com 
> Subject: RE: shrug-l: polygon to point
> 
> >From ArcMap help these steps allow you to add the x and y of the
> centroids
> to
> a polygon layer that can then be brought in as an event theme and saved
> as a
> shape file or other type of layer.
> 
> Start an edit session in ArcMap. Calculating a field is faster outside
> of an
> edit session, but you won't be able to undo the calculation. 
> Open the attribute table of the layer of the layer you want to edit. 
> Right-click the field heading for the X field (if there is no X field
> you
> can
> add a new field by clicking the options button and selecting the new
> field
> option). 
> Click Calculate Values. 
> Check Advanced. 
> Type the following VBA statement in the first text box. 
> 
> 	Dim dblX As Double
> 	Dim pArea As IArea
> 	Set pArea = [Shape]
> 	dblX = pArea.Centroid.X
> 
> Type the variable dblX in the text box directly under the X field name.
> 
> Click OK. 
> You can repeat the same process for updating a field with the Y
> coordinates
> for the centroid point of each polygon in the layer.
> 
> Mark Dietrich
> Division of Water Resource Management
> Florida Department of Environmental Protection
> (850) 245-8550
> mark.dietrich@dep.state.fl.us 
> 
> 
> -----Original Message-----
> From: shrug-l-admin@lists.dep.state.fl.us 
> [mailto:shrug-l-admin@lists.dep.state.fl.us] On Behalf Of Lingaraj
> Sahu
> Sent: Thursday, December 23, 2004 3:53 AM
> To: shrug-l@lists.dep.state.fl.us 
> 
> Cc: turkeyb99@yahoo.com 
> Subject: shrug-l: polygon to point
> 
> 
> 
> Hi ken
> 
> Three is three way of converting poly to point features
> 1. Arc GIS 9.x
>    Arc Tool Box----Data Mangement Tool----Features----Feature to point
> 
> 2. Arc Info (workstation)
>    if you have a polygon coverage then go to tools of Edit tools and
> then
> conversion tools----Topology-------Create labels Now open it in Arc
> View,
> when u will single click on the coverage on the ADD window, it will
> show
> three sub-heads under the main coverage head. Add the data and assign
> data
> from the raw orginal poly coverage using Geoprocessing Wizard and then
> convert it to .shp file for further use.
> 
> 3. Arc Info
> 
>    If u have a region instead of poly then go to edit----change edit
> feature
> to label and clean & Build as LABEL, and then follow the same procedure
> in
> Arc View as mentioned in No. 2
> 
> 
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