shrug-l: SUM: FL DEP Albers to NAD83 transformations

[Chris Stallings]

Dear group,

Thank you all for the help with my question regarding transformation  
from FL DEP Albers to NAD83.  I have listed the steps below, which  
includes transformations in the attributes table.  This last component  
was necessary for me since I am manually entering the Lat/Long data  
into my GPS.

thanks,
Chris



Steps for transforming FL DEP Albers to NAD83 (or any other  
conversion), including values in the Attributes Table

1.	 Start with only the layer being transformed open in ArcMap  
(possibly not necessary, but may help)
2.	Reproject coordinates
a.	Open ArcToolbox
b.	Data Management Tools > Projections and Transformations> Feature>Project
c.	Under ?Input Dataset? select the layer you wish to convert (should  
be the only one available if you only opened one in Step 1
d.	?Input Coordinate System? will be grayed out, but should be the  
original system; in this case, Albers Conical Equal Area
e.	Choose a directory and file name for the newly projected file (a  
new will be created and the old file will be retained)
f.	In ?Output Coordinate System?, click the icon next to the blank;   
In the ?Spatial Reference Properties? box, choose Select>Geographic  
Coordinate Systems folder>North America>North American Datum  
1983.prj>Add>OK
g.	In ?Geographic Transformation? type ?NAD_1983_To_HARN_Florida?

Steps for transforming the Lat/Long data in the attributes table:

1.	 Right click on the layer > Open Attribute Table
2.	Click Options > Add Field
3.	Name the column for the new coordinate system of the X-axis (e.g.,  
Long) > Set ?Type? = Double > OK
4.	Left click new column so it is highlighted blue
5.	Right click highlighted column > Field Calculator; a warning  
message will appear, click Yes
6.	Check the ?Advanced? box; ?Pre-logic VBA Script Code? will appear
7.	In the Pre-logic box, paste the following
	Dim dblX As Double
	Dim pPoint As IPoint
	Set pPoint = [Shape]
	dblX = pPoint.X

8.	In the ?Long =? (or whatever you named your new column) box, paste  
the following

   dblX

9.	Repeat steps 2-8 for the Y-axis (e.g., Lat) but replace the X?s in  
the script code with Y?s


-- 
Christopher D. Stallings, Ph.D.
Postdoctoral Associate
Florida State University Coastal and Marine Laboratory
3618 Highway 98
St. Teresa, FL 32358-2702

phone: (850) 697-4103
fax: (850) 697-3822
email: stallings at bio.fsu.edu
web: http://www.marinelab.fsu.edu/faculty/stallings.aspx



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