shrug-l: polygon to point

Greg Mauldin GregM@mail.co.leon.fl.us
Tue, 28 Dec 2004 08:31:42 -0500


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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