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Re: [udig-users] [udig-devel] BeeGIS - GPS Tool - Lon error
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Hi Jody,
I have answered taking this to the beegis list only since it was related to gps.
I asked for a nmea file to make some tests.
This anyway raises some questions regarding interest of merging some lists.
Ok, I will stop here and put my question and proposal in a new mail.
Cheers,
Andrea
On Thu, Jul 2, 2009 at 3:35 PM, Jody Garnett<jody.garnett@xxxxxxxxx> wrote:
> I am not sure where the problem is here; I am not sure how to read NMEA -
> where in that string is the Northing / Easting data?
> It sounds like the value coming out is just wrong; rather than a CRS
> setting. While you could correct for this by messing with the CRS definition
> by hand in uDig that is not really a good work around.
>
> Do you have a debugger in order to watch the NMEA data being parsed?
>
> Jody
>
> On 02/07/2009, at 8:21 PM, Ricardo Pinho wrote:
>
>>
>> Hi,
>>
>> I've just installed udig 1.1.1 with BeeGIS& Jgrass plugins. On a Windows
>> Tablet PC.
>>
>> Using the GPS Tool, I was also able to connect successfully with a
>> Bluetooth GPS (L1) .
>>
>> The problem is that BeeGIS gets the wrong position from GPS (WGS84)!
>>
>> For example:
>>
>> Here is the NMEA data received from GPS shown on “GPS Settings”:
>>
>>
>> $GPGGA,094300.000,4050.282133,N,00828.634375,W,1,8,0.85,211.388,M,51.205,M,,*4D
>>
>> $GPRMC,094252.000,A,4050.282134,N,00828.634365,W,0.009,234.14,020709,,,A*4D
>> This seems to be the right Gps connection port.
>>
>> And it shows on the GPS View tab:
>>
>> Northing = 40.83803583333336
>> Easting = - 7.8105705333333
>>
>> That has a incorrect Easting!!!
>>
>> This reflects on everything done with GPS Tool: Center the map, automatic
>> gps points, gps data logging, etc.
>>
>>
>> To my knowledge, based on the NMEA data values, the WGS 84 position should
>> be:
>>
>> N = 4050.282133 > N = 40 d 83.80356 s
>> W = 828.634375 > W = 8 d 47.72396 s
>>
>> N is correct but W is totally wrong!
>>
>> I know for sure that my WGS 84 lon position (Easting) is in fact -8.4772
>>
>> The uDIG project Map is associated with a CRS = WGS 84 (EPSG=4326)
>> The line layer properties Projection is the same.
>>
>> I have also tried several other CRS, and know they influence the North /
>> Easting shown values.
>>
>> Please, anyone can give me a clue about how to solve this problem?
>>
>> Thanks in advance!
>>
>> Regards,
>> Ricardo Pinho
>>
>>
>>
>> ____________________________________________________________________________________
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>> _______________________________________________
>> User-friendly Desktop Internet GIS (uDig)
>> http://udig.refractions.net
>> http://lists.refractions.net/mailman/listinfo/udig-devel
>
> _______________________________________________
> User-friendly Desktop Internet GIS (uDig)
> http://udig.refractions.net
> http://lists.refractions.net/mailman/listinfo/udig-devel
>
