gpsd | 易学教程

Getting positions from gpsd in a Qt quick program

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问题 I have a computer with a GPS connected to a serial port that is running gpsd with a pretty basic configuration. Here is the contents of /etc/default/gpsd: START_DAEMON="true" USBAUTO="false" DEVICES="/dev/ttyS0" GPSD_OPTIONS="-n -G" GPSD_SOCKET="/var/run/gpsd.sock" With this config, gpsd runs fine and all gpsd client utilities, e.g. cgps, gpspipe, gpsmon, can get data from the GPS. I am trying to access GPS data from a Qt QML program using the PositionSource element with the following syntax

how to convert a timestamp_t to a real time?

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问题 ive seen so many examples using a time_t, but timestamp_t is baffling me... Im doing an assignment where we need to print out GPS data, and the gps device returns a type timestamp_t for its time stamp and its an epoch time. Ive tried using gmtime() to convert and strftime() but nothing is working on that type. It keeps telling me it cannot convert timestamp_t* to time_t if i try using them. Anyone know of any function that can convert a timestamp_t to human readable time? thanks 回答1: This

Python GPS Module: Reading latest GPS Data

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问题 I have been trying to work with the standard GPS (gps.py) module in python 2.6. This is supposed to act as a client and read GPS Data from gpsd running in Ubuntu. According to the documentation from GPSD webpage on client design (GPSD Client Howto), I should be able to use the following code (slightly modified from the example) for getting latest GPS Readings (lat long is what I am mainly interested in) from gps import * session = gps() # assuming gpsd running with default options on port

How to get GPS data from Android phone?

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问题 Is there a method to tether (USB wired) the GPS data from and Android phone to PC? I am using a GPSTether app currently that is based on the gpsd project. I am loooking for alternatives that give more control and is less buggy than that app. Also, is there another method of doing this without using any third party apps? I am working on a location aware software project and want to read the GPS data periodically. The GPSTether app does exactly that on a TCP port over telnet. 回答1: The ideal

libgps C code example

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问题 I am writing a number-crunching data-logging C program for my GPS enabled Raspberry Pi. I grabbed gpsd, and its sample app cgps displays gps information correctly. I wanted to use libgps to interface with the daemon so that I could have all that handy information in my app, but I was quickly overwhelmed by the complexity of its API. The documentation on its HOWTO page points me to look at cgps and gpxlogger for example code, but there's so much coupling that I can't wade through it all. On

Which gps library would you recommend for python?

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问题 I'm looking for a free library for python that can calculate your direction and your speed from GPS coordinates and maybe can calculate if you are in some boundaries or things like this. Are there Libraries that you know and that worked well for you? Edit: Ok it seems I have to specify this a little bit. We are using python on a linux machine and getting the data from the gpsd. So I hope there is no need for a speciel library for only talking to the device. What I'm looking for is python code

convert GPS latitude longitude to Cartesian X and Y

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I found many algorithms to convert (latitude, longitude) into (X, Y)... however, I cannot verify if the results I'm getting are correct.. I found also this link which does the conversion online.. but I couldn't manage to get any algorithm which gives the same results as the one given by the link.. I would be grateful if anyone has encountered the same problem and can help me iOS solution If you're looking for some ready to go code in Objective-C you can check out UTM converter . It is also available as a CocoaPod. There's a very nice Wikipedia article on UTM . It's got formulas, background,

Python GPS Module: Reading latest GPS Data

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I have been trying to work with the standard GPS (gps.py) module in python 2.6. This is supposed to act as a client and read GPS Data from gpsd running in Ubuntu. According to the documentation from GPSD webpage on client design ( GPSD Client Howto ), I should be able to use the following code (slightly modified from the example) for getting latest GPS Readings (lat long is what I am mainly interested in) from gps import * session = gps() # assuming gpsd running with default options on port 2947 session.stream(WATCH_ENABLE|WATCH_NEWSTYLE) report = session.next() print report If I repeatedly