1GPSCSV(1) GPSD Documentation GPSCSV(1)
2
6 gpscsv - dump the JSON output from gpsd as CSV
7
9 gpscsv [OPTIONS] [host[:port[:device]]]
10 gpscsv -h
12 gpscsv -V
14
16 gpscsv is a simple Python program for reading gpsd JSON data streams
17 and outputting them in Comma Separated Values (CSV) format. It takes
18 input from a specified gpsd and reports to standard output. The program
19 runs until the gpsd dies, "-n COUNT" messages are processed, "-x
20 SECONDS" have passed, or it is interrupted by ^C or other means.
21 gpscsv can only collect data that your gpsd is already sending. Use
23 gpspipe to see what JSON message classes it is sending.
24 One good use of gpscsv is to create CSV files for use with the gnuplot
26 program.
27 gpscsv does not need root, but will run fine as root.
29
31 The program accepts the following options:
32 -?, -h, --help
34 Show help information and exit.
35 -c MCLASS, --class MCLASS
37 Select the JSON class messages of type MCLASS. Overrides the
38 default class of TPV. See the CLASSES section below for more
39 information.
40 --cvt-isotime
42 Convert fields named "time" from ISO time to UNIX time.
43 -D LVL, --debug LVL
45 Set debug level to LVL. Default 0. Higher arguments than 0 produce
46 more debug output.
47 --device DEVICE
49 The DEVICE on the gpsd to connect to. Defaults to all.
50 -f FIELDS, -fields FIELDS
52 The FIELDS from the JSON message to dump to the output. Set FIELD
53 to empty ('') for all initially seen fields. Default varies by
54 CLASS.
55 --file FILE
57 Read JSON from FILE instead of from gpsd.
58 --header HEADER
60 Set header style to HEADER. 0 for no header, 1 output fields as
61 header, 2 send fields as a comment ('#'). Defaults to 1.
62 --host HOST
64 Connect to the gpsd on HOST. Defaults to localhost.
65 -n COUNT, --count COUNT
67 Exit after outputting COUNT records. Set COUNT to 0 to disable.
68 Default is 0
69 --port PORT
71 Use PORT to connect to gpsd. Defaults to 2947.
72 --separator SEPARATOR
74 Use SEPARATOR as the field separator. Default separator is a comma
75 (',').
76 -V, --version
78 Show gpscsv version, and exit.
79 -x SECONDS, --seconds SECONDS
81 Exit after SECONDS number of seconds have passed. Set SECONDS to 0
82 to disable. Default is 0
83 All the above individual options may be specified multiple times, but
85 t only the last one off each will be used.
86
88 Some of the gpsd JSON message classes include sub-classes. gpscsv
89 allows direct access to them using a meta-class (MCLASS).
90 ┌──────────┬──────────┬─────────────────────┐
92 │ │ │ │
93 │MCLASS │ Class │ Description │
94 ├──────────┼──────────┼─────────────────────┤
95 │ │ │ │
96 │ALMANAC │ SUBFRAME │ ALMANAC from │
97 │ │ │ SUBFRAME JSON │
98 ├──────────┼──────────┼─────────────────────┤
99 │ │ │ │
100 │HEALTH │ SUBFRAME │ HEALTH from │
101 │ │ │ SUBFRAME JSON │
102 ├──────────┼──────────┼─────────────────────┤
103 │ │ │ │
104 │HEALTH2 │ SUBFRAME │ HEALTH2 from │
105 │ │ │ SUBFRAME JSON │
106 ├──────────┼──────────┼─────────────────────┤
107 │ │ │ │
108 │IONO │ SUBFRAME │ IONO from SUBFRAME │
109 │ │ │ JSON │
110 ├──────────┼──────────┼─────────────────────┤
111 │ │ │ │
112 │NMCT │ SUBFRAME │ NMCT from SUBFRAME │
113 │ │ │ JSON │
114 ├──────────┼──────────┼─────────────────────┤
115 │ │ │ │
116 │SUBFRAME1 │ SUBFRAME │ SUBFRAME1 │
117 │ │ │ (Ephemeris 1) from │
118 │ │ │ SUBFRAME JSON │
119 ├──────────┼──────────┼─────────────────────┤
120 │ │ │ │
121 │SUBFRAME2 │ SUBFRAME │ SUBFRAME2 │
122 │ │ │ (Ephemeris 2) from │
123 │ │ │ SUBFRAME JSON │
124 ├──────────┼──────────┼─────────────────────┤
125 │ │ │ │
126 │SUBFRAME3 │ SUBFRAME │ SUBFRAME3 │
127 │ │ │ (Ephemeris 3) from │
128 │ │ │ SUBFRAME JSON │
129 ├──────────┼──────────┼─────────────────────┤
130 │ │ │ │
131 │SAT │ SKY │ Individual │
132 │ │ │ satellites from SKY │
133 ├──────────┼──────────┼─────────────────────┤
134 │ │ │ │
135 │SKY │ SKY │ The basic parts of │
136 │ │ │ SKY JSON │
137 ├──────────┼──────────┼─────────────────────┤
138 │ │ │ │
139 │TPV │ TPV │ The basic parts of │
140 │ │ │ TPV JSON │
141 └──────────┴──────────┴─────────────────────┘
142
144 By default, clients collect data from the local gpsd daemon running on
145 localhost, using the default GPSD port 2947. The optional argument to
146 any client may override this behavior: [server[:port[:device]]]
147 For further explanation, and examples, see the ARGUMENTS section in the
149 gps(1) man page
150
152 Some basic standalone examples:
153 Grab three cycles of TPV data:
155 $ gpscsv -c TPV -n 3
157 time,lat,lon,altHAE
158 2021-07-28T22:38:37.000Z,44.0688638,-121.3140643,1108.223
159 2021-07-26T22:38:37.000Z,44.068863833,-121.314064333,1108.3
160 2021-07-28T22:38:38.000Z,44.0688637,-121.314065,1108.363
161 Grab one set of satellite data:
163 $ gpscsv -c SAT -n 1
165 time,gnssid,svid,PRN,az,el,ss,used,health
166 2021-07-28T22:37:46.000Z,0,8,8,311.0,28.0,33.0,True,1
167 2021-07-28T22:37:46.000Z,0,10,10,290.0,74.0,50.0,True,1
168 2021-07-28T22:37:46.000Z,0,15,15,45.0,18.0,31.0,False,1
169 2021-07-28T22:37:46.000Z,0,16,16,244.0,7.0,23.0,True,1
170 2021-07-28T22:37:46.000Z,0,18,18,109.0,43.0,37.0,True,1
171 2021-07-28T22:37:46.000Z,0,23,23,49.0,62.0,38.0,True,1
172 2021-07-28T22:37:46.000Z,0,24,24,87.0,16.0,28.0,True,1
173 2021-07-28T22:37:46.000Z,0,27,27,280.0,52.0,42.0,True,1
174 2021-07-28T22:37:46.000Z,0,32,32,188.0,32.0,42.0,True,1
175 2021-07-28T22:37:46.000Z,5,3,195,305.0,6.0,13.0,False,1
176 2021-07-28T22:37:46.000Z,6,2,66,38.0,8.0,21.0,False,1
177 2021-07-28T22:37:46.000Z,6,3,67,34.0,60.0,32.0,True,1
178 2021-07-28T22:37:46.000Z,6,4,68,226.0,63.0,34.0,True,1
179 2021-07-28T22:37:46.000Z,6,5,69,220.0,12.0,32.0,True,1
180 2021-07-28T22:37:46.000Z,6,11,75,-999,4.0,0.0,False,2
181 2021-07-28T22:37:46.000Z,6,12,76,47.0,0.0,0.0,False,1
182 2021-07-28T22:37:46.000Z,6,17,81,142.0,8.0,31.0,True,1
183 2021-07-28T22:37:46.000Z,6,18,82,138.0,57.0,40.0,True,1
184 2021-07-28T22:37:46.000Z,6,19,83,333.0,70.0,29.0,True,1
185 2021-07-28T22:37:46.000Z,6,20,84,323.0,10.0,0.0,False,1
186 Plot Examples
188 Some plot examples, do them in exact order shown:
189 Grab 100 samples of time,lat,lon,altHAE:
191 $ gpscsv -n 100 --cvt-isotime > tpv.dat
193 Grab 100 samples of time,epx,epy,epv,eph,sep
195 $ gpscsv -n 100 --cvt-isotime -f time,epx,epy,epv,eph,sep > ep.dat
197 Grab 100 samples of time,xdop,ydop,vdop,tdop,hdop,gdop,pdop
199 $ gpscsv -n 100 --cvt-isotime -c SKY > sky.dat
201 Grab 100 samples of time,nSat,uSat
203 $ gpscsv -n 100 --cvt-isotime -c SKY -f time,nSat,uSat > sat.dat
205 Viewing CSV data with gnuplot
207 Start gnuplot in interactive mode:
208 $ gnuplot
210 Some gnuplot housekeeping:
212 # this are csv files
214 gnuplot> set datafile separator ','
215 # use the first line as title
216 gnuplot> set key autotitle columnhead
217 # X axis is UNIT time in seconds.
218 gnuplot> set xdata time
219 gnuplot> set timefmt "%s"
220 Now to plot time vs latitude, using tpv.dat from above:
222 gnuplot> plot 'tpv.dat' using 1:2
224 Then to plot longitude and altHAE, in separate plots:
226 gnuplot> plot 'tpv.dat' using 1:3
228 gnuplot> plot 'tpv.dat' using 1:4
229 Put both latitude and longitude on one plot:
231 gnuplot> set y2tics
233 gnuplot> plot 'tpv.dat' using 1:2, '' using 1:3 axes x1y2
234 Plot epx, epy, epv, eph, and sep in one plot, using ep.dat from above:
236 gnuplot> plot 'ep.dat' using 1:2, '' using 1:3, \
238 '' using 1:4, '' using 1:5, '' using 1:6
239 Plot all the DOPs on one plot, from sky.dat above:
241 gnuplot> plot 'sky.dat' using 1:2, '' using 1:3, '' using 1:4, \
243 '' using 1:5, '' using 1:6, '' using 1:7, '' using 1:8
244 Plot nSat and uSat together:
246 gnuplot> plot 'sat.dat' using 1:2, '' using 1:3
248 Lat/lon scatter plot:
250 # x is no longer time
252 gnuplot> set xdata
253 gnuplot> plot 'tpv.dat' using 3:2 title 'fix'
254
256 0
257 on success.
258 1
260 on failure
261
263 gpspipe(1), gpsd_json(5), gpsd(8), gnuplot(1)
264
266 Project web site: https://gpsd.io/
267
269 This file is Copyright 2020 by the GPSD project
270 SPDX-License-Identifier: BSD-2-clause
271
273 Gary E. Miller
274GPSD, Version 3.25 2023-01-10 GPSCSV(1)