[caret-users] Latitude/Longitude

John Harwell john at brainvis.wustl.edu
Wed Jun 13 12:11:58 CDT 2007


Mateus,

We will add ROI node selection with latitude/longitude to our "to-do"  
list.

First, convert the LatLon file to a Metric file:
* Write your latitude/longitude file and be sure that "Data File  
Encoding" at the bottom of the Save Data File Dialog is set to "Ascii  
(Text)".
* Load the lat/lon file into a text editor.
* Change "tag-version 1" to "tag-version 2"
* Change "tag-number-of-columns 1" to "tag-number-of-columns 4"
* Save the lat/lon file
* Change then name of the lat-lon file so that it ends with ".metric".
* Select File Menu->Open Data File.  Set the type to Metric, choose  
the file, and press the Open button.  A Dialog will appear listing  
the columns for loading.  Set the names of the first two columns to  
"Long" and "Lat" respectively.


Second, to select the ROI
* Use the Display Control to set the displayed metric to "Lat".
* On the Surface ROI Dialog, set the selection method to "Nodes with  
Metric".
* Set the Thresholds to the range of latitudes you want to select.
* Press the Select Nodes button.
* On the Display Control Dialog, change the selected metric to "Long".
* On the Surface ROI Dialog, change "Normal Selection" to "And  
Selection (Intersection)".
* Set the thresholds to the range of longitudes you want to select.
* Press the Select Nodes button.

----------------------------------------------------------
John Harwell
john at brainvis.wustl.edu
314-362-3467

Department of Anatomy and Neurobiology
Washington University School of Medicine
660 S. Euclid Ave.    Box 8108
St. Louis, MO 63110   USA

On Jun 13, 2007, at 11:13 AM, Mateus Joffily wrote:

> Hi,
>
> I would like to select every node that is inside a certain range of  
> latitude/longitude coordinates.
> I thought to create a metric column with the nodes' longitude and  
> latitude values and then use the 'Node with Metric' operation from  
> 'Surface Region of Interest' dialog to select the nodes. But I am  
> not sure it is the easiest way of doing it... Does anyone has any  
> suggestion?
> Thank you very much.
>
> Mateus
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> caret-users at brainvis.wustl.edu
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