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Questions tagged [post-processing]

Post-processing usually refers to any processing done to GPS data after it has been collected in the field to improve its accuracy using differential correction.

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Calculate Galileo satellite position from Ephemeris data

I'm trying to calculate Galileo stallite's position from ephemerides data. I'm reading from https://gssc.esa.int/navipedia/GNSS_Book/ESA_GNSS-Book_TM-23_Vol_I.pdf at 3.3.1. The first step is: ...
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Wrong projection used in Pathfinder

I am having issues with coordinate systems in post processing. Does anyone have a recommendation of videos to watch or online classes that can help me improve on this? This is my current issue: Data ...
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2answers
769 views

Postprocessing with NMEA-data if no rinex-data is available

I have an UAV which does not give me the raw sensor data (e.g. rinex or ubx). The only format I get is NMEA. Now I want to know how could I use the NMEA-data to get the highest precision of my ...
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341 views

rtklib DGPS error no nav data

I want to post-process GPS files via Differential processing (DGPS/DGNSS mode) using rtklib (http://www.rtklib.com/). I have rover and base observations in .rinex format. I took FINAL satellite ...
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2answers
134 views

Pathfinder Post-processing incorrectly- Data severely shifted

I'm new to Pathfinder (just transferred our license over to my computer). I post-processed my data and exported to ESRI shapefile. My data from the east end of Long Island, New York displays off the ...
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1answer
585 views

Pathfinder Office not carrier correcting my data

I'm having an odd/frustrating issue with PFO. Specifically, I have not been able to correctly post-process any data for months. To elaborate, my coworkers are all able to post-process the same SSF ...
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1answer
642 views

SSF to RINEX problem

I used Pathfinder office 4.2 to export GeoXH data into RINEX format. It works right when I have only 1 point feature, however when I have multiple point features I get only 1 point feature in the ...
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1answer
139 views

Seeking open source software for post-processing > Utility mapping? [closed]

I am using Mobile Mapper 10 with MobileMapper Field 4.7 Mapping software more mapping of underground,cables and pipes as well as various point features. The standard accuracy is 2m, I need compatible ...
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1answer
46 views

What is the standard method of finding satellite positions in between the 15 minute intervals in an SP3 file?

SP3 files provide satellite positions for every 15 minutes. How would you find the satellite position at a time between two logged positions, i.e. 7 minutes after the last logged position? I can ...
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154 views

What is the lowest and highest possible pseudo-range?

I am trying to compact the required data that needs to be sent to the server to post-process the receiver's position. To do this, I figured it'd be possible to offset the pseudo-range by a fixed value....
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203 views

Stretch to MinMax results in blank render output in QGIS?

I am a new QGIS user, and I can't figure out if I encountered a bug. If I have a multi-layer image, and "Multiband color" -> "Stretch to MinMax" selected I get the following behaviour. QGIS takes a ...
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1answer
895 views

Post-processing GPS Satellite Measurements

I am working on a system that reports its location to a server using very little power. In order to achieve an extremely low power usage, I am avoiding having to download both the almanac and the ...
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2answers
438 views

Pathfinder Office - 0% base data coverage

I am trying to post-process data collected with a Trimble Juno SB (sometimes hooked up to a ProXRT), in Pathfinder Office version 4.20. I had no issues when I tested this in the US. But now that I ...
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1answer
44 views

Postprocessing MapServer outputs [closed]

I need to perform a postprocessing operation on an image produced by MapServer before it is handed off to the final user of that image. I am looking for a way to hand a resulting image from MapServer ...
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1answer
119 views

Base station correction process

This concerns post-processing via base station correction in Pathfinder Office. I understand the base station is a known location and the GPS receiver's location is corrected relative to the base. I'm ...
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1answer
4k views

Why are Differential Correction services unable to transfer files for a 24-hour period?

Over the past year I have gone out and gathered Feature points using a Trimble GPS Device. When I'm done, I'll come back to the office and try to perform Differential Correction using Pathfinder ...
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1answer
335 views

Post Processing Algorithm

I am working on project In which I am supposed to make a web app which will be asking users to upload their inputs as "Rinex file" of Rover and Base Station and It will give more precise data after ...
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1answer
4k views

What is required for post-processing differential correction? (And can Garmin units provide it?)

2 very closely related questions about differential correction with a Garmin unit: 1). Some data was collected using a Garmin GPSMAP 76Cx unit and the data collectors are interested in whether post-...
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1answer
757 views

How to improve accuracy or extrapolate missing or bad GPS points

Is there an easy to use freeware tool to postprocess my location data, in order to correct 1) location errors (or improve accuracy not based on differential GPS correction) and 2) deal with missing ...
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1answer
609 views

Is it possible to post process iPhone GPS data?

Is there software available for post processing iPhone based GPS data? I want to post process a set of coordinate values to correct for measurement errors. There is a NOAA CORS base station about 40 ...