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5

It appears to be decimals of a minute, as FelixIP suggested. So it could be written 68 35.067 N, 123 54.817 W and recognized in Google Earth. It's actually not too uncommon to see this notation. I plugged in a couple of points this way, and they appear on the river course.


3

This gets at some fundamental spatial data quality concepts, and the qualities of the device being used. There is both accuracy and precision to be considered, and these are not the same thing - precision refers to how much variation exists in repeated measurements by your measuring system (i.e., how reproducible and reliable measurements are), while ...


3

I have given up on my original idea to stream NMEA into Google Earth.. and found a better solution! I was able to solve this by programmatically generating KML file for each position and attitude change and then opening up an instance of Google Earth with the generated KML file as parameter. This is happening in 250ms loop which makes the transitions smooth....


3

Yes this is how Differential GPS (DGPS) works. Reference stations for which the location is precisely and accurately known are used to apply corrections to the GPS 'rover'. This can be done in post processing or in real time with a data transmission from the (network of) reference stations. You need a special GPS receiver. Here is a quick explanation from ...


2

If the bug tracker doesn't work for you, consider writing to the QGIS user mailing list. It usually doesn't make much sense for other users to report bugs that they don't encounter or cannot reproduce themselves because they cannot answer potential follow-up questions.


2

Without the data transfer utility there isn't a way (that I've ever heard of) to convert the device files to an SSF. Trimble data files on the device consist of 9 individual files ( .car; .dd; .gic; .gip; .gis; .giw; .gix; .obs, and .obx) that the transfer wizard takes and converts into a single SSF that you work with in Pathfinder Office. Without that ...


2

Yes it is possible to create a custom basemap for a Garmin unit. It isn't straightforward or well documented. It definitely isn't supported by Garmin. There are a few ways of doing it, but the steps I used involve these software: GPSMapEdit - import shapefiles into a Polish Map format file http://geopainting.com/ Cgpsmapper - convert the Polish Map Format ...


2

The PRN ("Pseudo Random Noise") is generated in the GPS receiver using a pair of 10-bit shift registers - Shift register is a set of memory cells when a clock pulse is applied to register the content of each cell shifts on a step to the right. The input to the first cell is determined by the combined state of other cells then everything is shifted right and ...


1

I do not believe you are comparing apples to apples here. The R1 and R2 are are MGIS products (I realize the R2 can also be used by Trimble Access) and the use of 3rd party software is more likely, whereas the R3 (L1 only), R4 all the way to the R10 are survey receivers. The survey receivers typically require a specialized software, like Trimble Access to ...


1

The pyephem Python module can help here. From the docs: >>> import ephem >>> atlanta = ephem.Observer() >>> atlanta.pressure = 0 >>> atlanta.horizon = '-0:34' >>> atlanta.lat, atlanta.lon = '33.8', '-84.4' >>> atlanta.date = '2009/09/06 17:00' # noon EST >>> print(atlanta.previous_rising(ephem....


1

Some mobile CPUs are marketed as supporting Galileo. Like the MT3333 cpu from Mediatek, integrated in the Garmin Monterra, which is an android based GPS. But i don't know if there needs to be some additional software to integrate the functionality, or just an android config file to play with to make more satellites systems available in android configuration



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