Re: [udig-users] [Beegis-users] [udig-devel] BeeGIS - GPS Tool - Lon err

[Ricardo Pinho <rpinho_eng@xxxxxxxxxxxx>]

Hi,

Sorry for cross posting, I was just looking for help!

Since it is not clear, for me, where the problem resides, in BeeGIS or in uDIG?
I have decided to post on both!

Jody,

Thank you also for your help.
I've used the uDIG x86 installer for Windows, so there is no Debugger.

> It sounds like the value coming out is just wrong; rather than a CRS
> setting. 

I agree with you, the problem seems to be on the BeeGIS NMEA parser.
I've used successfuly this Bluetooth GPS for several years with lots of GPS software!


> While you could correct for this by messing with the CRS definition

Also tried it, with WGS 84 UTM definitions. But couldn't get one that returns the correct lon value.

Regards,
Ricardo Pinho


----- Mensagem original ----
De: andrea antonello <andrea.antonello@xxxxxxxxx>
Para: User-friendly Desktop Internet GIS <udig-devel@xxxxxxxxxxxxxxxxxxxxx>
Cc: beegis-users@xxxxxxxxxxxxx; udig-users@xxxxxxxxxxxxxxxxxxxxx
Enviadas: Quinta-feira, 2 de Julho de 2009 14:40:52
Assunto: Re: [Beegis-users] [udig-devel] BeeGIS - GPS Tool - Lon error

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
>
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