1OSMIUM-DERIVE-CHANGES(1) OSMIUM-DERIVE-CHANGES(1)
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6 osmium-derive-changes - create OSM change files from two OSM data files
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9 osmium derive-changes [OPTIONS] OSM-FILE1 OSM-FILE2
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12 Finds differences between two OSM files and creates a change file with
13 those differences. The resulting change file is created in a way, that
14 it could be applied on OSM-FILE1 to re-create OSM-FILE2.
15 Objects in both input files must be sorted by type, ID, and version.
17 The first input file must be from a point in time before the second in‐
18 put file.
19 Only object type, id, and version are compared, so this program will
21 not detect differences in, say, the tags, unless the object has a new
22 version, which is the normal way things work in OSM. If you need to
23 compare all data in OSM files, have a look at the osmium diff program.
24 For this command to create a proper change file you have to set the
26 --output option or --output-format option in a way that it will gener‐
27 ate an .osc file, typically by using something like `-o out.osc.gz'.
28 You can create any other OSM file format, but that is usually not what
29 you want. Osmium derive-changes will warn you in this case.
30 Note that for objects that are in OSM-FILE1 but not OSM-FILE2 a
32 “deleted” entry will be created in the output. But because we can not
33 know when this deletion actually occurred, in which changeset, and by
34 which user, it is unclear what attributes this deleted object should
35 have. Also, if you are working with extracts, the object might not ac‐
36 tually have been deleted in the OSM database, but just moved out of the
37 extract you are looking at. So a real, new, “deleted” version was
38 never created. Usually the “deleted” object will get the same version
39 number and timestamp as the object in OSM-FILE1 had, all other informa‐
40 tion will be removed. But you can change this using the --increment-
41 version, --keep-details, and --update-timestamp options. Depending on
42 which software you are using the change files with, different settings
43 might be necessary.
44 This commands reads its input files only once and writes its output
46 file in one go so it can be streamed, ie. it can read from STDIN and
47 write to STDOUT.
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50 --increment-version
51 Increment version number of deleted objects.
52 --keep-details
54 Keep details of deleted objects. Usually only id, version, and
55 timestamp are kept. If this option is set all attributes, all
56 tags, and all nodes or members for ways and relations, respec‐
57 tively, are kept.
58 --update-timestamp
60 Update timestamp of deleted objects to the current time. This
61 is the same behaviour as Osmosis.
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64 -h, --help
65 Show usage help.
66 -v, --verbose
68 Set verbose mode. The program will output information about
69 what it is doing to STDERR.
70 --progress
72 Show progress bar. Usually a progress bar is only displayed if
73 STDOUT and STDERR are detected to be TTY. With this option a
74 progress bar is always shown. Note that a progress bar will
75 never be shown when reading from STDIN or a pipe.
76 --no-progress
78 Do not show progress bar. Usually a progress bar is displayed
79 if STDOUT and STDERR are detected to be a TTY. With this option
80 the progress bar is suppressed. Note that a progress bar will
81 never be shown when reading from STDIN or a pipe.
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84 -F, --input-format=FORMAT
85 The format of the input file(s). Can be used to set the input
86 format if it can’t be autodetected from the file name(s). This
87 will set the format for all input files, there is no way to set
88 the format for some input files only. See osmium-file-for‐
89 mats(5) or the libosmium manual for details.
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92 -f, --output-format=FORMAT
93 The format of the output file. Can be used to set the output
94 file format if it can’t be autodetected from the output file
95 name. See osmium-file-formats(5) or the libosmium manual for
96 details.
97 --fsync
99 Call fsync after writing the output file to force flushing buf‐
100 fers to disk.
101 --generator=NAME
103 The name and version of the program generating the output file.
104 It will be added to the header of the output file. Default is
105 “osmium/” and the version of osmium.
106 -o, --output=FILE
108 Name of the output file. Default is `-' (STDOUT).
109 -O, --overwrite
111 Allow an existing output file to be overwritten. Normally os‐
112 mium will refuse to write over an existing file.
113 --output-header=OPTION=VALUE
115 Add output header option. This command line option can be used
116 multiple times for different OPTIONs. See the libosmium manual
117 for a list of available header options. For some commands you
118 can use the special format “OPTION!” (ie. an exclamation mark
119 after the OPTION and no value set) to set the value to the same
120 as in the input file.
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123 osmium derive-changes exits with exit code
124 0 if everything went alright,
126 1 if there was an error processing the data, or
128 2 if there was a problem with the command line arguments.
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132 osmium derive-changes doesn’t keep a lot of data in memory.
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135 Find changes in Nepal extract in January 2016:
136 osmium derive-changes nepal-20160101.osm.pbf nepal-20160201.osm.pbf -o nepal-jan.osc.bz2
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140 • osmium(1), osmium-file-formats(5), osmium-apply-changes(1), osmium-
141 diff(1)
142 • Osmium website (https://osmcode.org/osmium-tool/)
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146 Copyright (C) 2013-2021 Jochen Topf <jochen@topf.org>.
147 License GPLv3+: GNU GPL version 3 or later <https://gnu.org/li‐
149 censes/gpl.html>. This is free software: you are free to change and
150 redistribute it. There is NO WARRANTY, to the extent permitted by law.
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153 If you have any questions or want to report a bug, please go to
154 https://osmcode.org/contact.html
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157 Jochen Topf <jochen@topf.org>.
158 1.13.1 OSMIUM-DERIVE-CHANGES(1)