shrug-l: Working with two different extents

Jordan, Jack Jack.Jordan at
Fri Aug 14 12:29:07 EDT 2009



More backgrounder for these topics is on Peter Dana's pages-






Jack Jordan



"The world, she's-a round-a, round-a like-a your head" - Chris Columbus, as
paraphrased by the Warner Bros.




From: shrug-l-bounces at
[mailto:shrug-l-bounces at] On Behalf Of April Herrett
Sent: Thursday, August 13, 2009 12:35 PM
To: 'Tripp Corbin'; Matthew.Muller at
Cc: shrug-l at
Subject: RE: shrug-l: Working with two different extents




Although I've muddled through with doing some extra study, and am feeling
more comfortable with the processes, I think that Coordinate Systems,
Projections, Datums, GCS has been the most misunderstood fundamental concept
of learning GIS for most people I've been around.


Many times I find terms used interchangeably even at professional levels.


I suppose for most of you that have mastered the field it's all become second
nature.    The subject well worth extra study time for some of us greenhorns.   ...


Wow, my vote is this subject for a URISA one-day workshop or lunch and learn
.  might help keep some of us straightened out..  



April Herrett

GIS Student


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	From: shrug-l-bounces at
[mailto:shrug-l-bounces at] On Behalf Of Tripp Corbin
	Sent: Thursday, August 13, 2009 10:04 AM
	To: Matthew.Muller at
	Cc: shrug-l at
	Subject: RE: shrug-l: Working with two different extents

	In order to reproject a shapefile from one coordinate system to
another, you need to use the project tool in ArcToolbox. Simply changing the
settings in the Shapefile propertied or recreating the prj file does not
actually reproject the data. Try this:


	1.       Make sure the correct projection is assigned to each
shapefile. This may require you to delete the current prj, look at the
coordinate values in ArcMap or in the preview in ArcCatalog, from those
values determine the correct coordinate system. Hint: If you see a negative
number it is most likely in Lat and Long. 

	2.       Once the correct coordinate system has been assigned to each
shapefile, use the project tool in ArcToolbox to change the coordinate system
to the one you desire, State Plane, UTM, Lat and Long or whatever. This
actually creates new shapefiles with new coordinate values.

	3.       Add new  shapefiles to a new Map. 


	Tripp Corbin, MCP, CFM, GISP
	Vice President, GIS/IT
	ESRI Authorized Instructor
	Keck & Wood, Inc. <> 
	(678) 417-4013
	(678) 417-8785 fax


	From: Matthew.Muller at
[mailto:Matthew.Muller at] 
	Sent: Thursday, August 13, 2009 9:55 AM
	To: Tripp Corbin
	Cc: shrug-l at;
shrug-l-bounces at
	Subject: RE: shrug-l: Working with two different extents


	Originally, the wetlands file did not have any spatial information
associated with it. The parcel data uses
NAD_1983_StatePlane_Florida_East_FIPS_0901_Feet and GCS_North_American_1983.
I have selected these coordinates using both the select option under
shapefile properties. I have also used the prj file for the parcel data to
replace the prj file associated with the wetlands file. 
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