[caret-users] Latitude/Longitude

Mateus Joffily joffily at isc.cnrs.fr
Fri Jun 15 10:53:10 CDT 2007


Hi John,

Thank you very much. Sorry for the large attachment. I just realized the 
message size, after sending it.
My operating system is Linux.

Thanks again,
Mateus


John Harwell wrote:

> Hi Mateus,
>
> The copy of the file you included does not have valid latitude  
> longitude values.  Latitude should range from -90 to +90 and  
> Longitude should range -180 to +180.
>
> The problem is that Caret is not reading binary format latitude  
> longitude files correctly and I have just fixed this problem.  In  
> addition, I have modified the Surface Region of Interest Dialog to  
> allow node selection based upon a range of Lat/Long values.  Let me  
> know which operating system you are using and I will make an updated  
> version of Caret available for you to download.
>
> Lastly, it is probably not a good idea to include caret data files in  
> emails as they can make the messages very large.  If needed, we do  
> have a website where files can be uploaded.
>
> ----------------------------------------------------------
> 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 14, 2007, at 3:45 AM, Mateus Joffily wrote:
>
>> John,
>>
>> Thank you for the detailed explanation.
>> I followed it, but I am not confident that I got the correct  result. 
>> To be sure that there was not a problem with my lat/lon  file, I 
>> decided to test it with CARET_TUTORIAL_SEPT06/PAL_B12.BOTH- 
>> HEMS.STANDARD-SCENES.73730.spec. I am attaching the images that I  
>> captured from the created metric columns LAT and LONG. The LONG  
>> column has only zeros and the LAT column has some strange values.  
>> Instead, I would expect a grading of values along the latitude- 
>> longitude isocontours. Is it correct? I am also attaching a copy of  
>> the latlon file (PALS_B12.LR.73730.latlon) converted to metric.
>>
>> Thanks,
>> Mateus
>>
>> John Harwell wrote:
>>
>>> 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
>>>> _______________________________________________
>>>> caret-users mailing list
>>>> caret-users at brainvis.wustl.edu
>>>> http://pulvinar.wustl.edu/mailman/listinfo/caret-users
>>>
>>>
>>>
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>>>
>>>
>
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