Changeset1

Process OSM's changeset feed, and check node overlaps within a bounding box

What it's not designed to be: A replacement for the OSM History Tab, OWL, WhoDidIt, or any of the tools described on http://wiki.openstreetmap.org/wiki/Quality_assurance

What it is: A small java program that can be invoked per user or with a file containing a list of command-line arguments allowing edits by particular users within particular areas to be monitored.

It uses the OSM API so please don't go mad with it - follow http://wiki.openstreetmap.org/wiki/API_usage_policy

Eclipse

You can import it into Eclipse if you want to (although, given that it's only a few small Java classes, there's really no need to). If you're not using an IDE, install a JDK (e.g. from http://www.oracle.com/technetwork/java/javase/downloads/jdk7-downloads-1880260.html), then just ensure that the javac that you have just installed is on the PATH, and javac Changeset1.java etc. Then just java Changeset1 ....

Usage examples

java -jar Changeset1.jar -time="2013-11-04T20:53" -debug=5 -display_name="SomeoneElse" -bbox=-2.123,52.809,-0.331,53.521 -output=example_out.txt

This looks for changesets by the user named SomeoneElse in the specified bounding box since the specified time. The output file contains lines like this, one per changeset:

SomeoneElse;61942;18740137;Potlatch 2;2.3;Wragby road - updated lanes where I'd miscounted.;Changeset: bbox overlaps

(that's username, userid, changeset number, editor version, changeset comment and the reason that it's in the list, all comma-separated).

Pass a download_changeset parameter and it'll download changeset contents and check for things that might be iffy in there too:

java -jar Changeset1.jar -time="2013-11-04T20:53" -debug=5 -display_name="SomeoneElse" -bbox=-2.123,52.809,-0.331,53.521 -download_changeset=1 -output=example_out.txt

Pass a building parameter as well as download_changeset and it'll check for buildings and shops with more than a certain number of nodes.

java -jar Changeset1.jar -time="2013-11-04T20:53" -debug=5 -display_name="SomeoneElse" -bbox=-2.123,52.809,-0.331,53.521 -download_changeset=1 -building=10 -output=example_out.txt

This is designed to help flag landuse areas that have been changed to buildings or shops by iD users by mistake (see openstreetmap/iD#542).

You can also group a series of checks into an input file. Let's imagine that example2_in.txt contains:

-display_name="SomeoneElse_Revert" -bbox=-7,50,2,61 -download_changeset=1
-display_name="SomeoneElse"  -bbox=-2.123,52.809,-0.331,53.521 -download_changeset=1

You can then:

java -jar Changeset1.jar -time="2013-11-04T20:53" -debug=5 -input=example1_in.txt -output=example2_out.txt

It'll then process each of the users in the input file.

The maximum number of changesets returned is restricted by the API limit.

Things that it can spot

Deleted ways and relations
Single node ways
Ways with no tags (which then need to be checked manually to make sure that they're not part of a relation, or were updated later in the changeset to have tags).
Landuse ways that have been erronously converted to buildings or shops because of iD bug 542.

Supported Parameters

-help

Prints a basic "usage" screen.

-input=some_input_file.txt

Specifies an input file containing lines of users to check (and other parameters).

-output=some_output_file.txt

Specifies an output file into which a summary of findings will be written.

-display_name="Some User Name"

Specifies a user's display name to search for changesets for. It will be URLencoded before being passed to the API

-user=112

Specifies a user's userid to search for changesets for. Useful for when display names change, or when they contain characters that can't easily be passed from the command line.

-id=37428

Specifies a changeset id to download. Use this instead of -display_name=, -user= or -time= to examine one specific changeset.

-time="2013-11-04T20:53"

The time, specified in a way that the API will understand, to search for changesets from.

-dev

Use the dev server ("api06.dev.openstreetmap.org") instead of the live one.

-debug=0

A number between 0 and 8, used to control the amount of debug written to stdout as processing occurs. The higher the number, the more debug.

-bbox=-2.123,52.809,-0.331,53.521

The bounding box to check changesets against. If specified it's not passed to the API, so the output will show "X changesets, none of interest" if a mapper has mapped elsewhere. If "-download_changeset=1" is also specified, then nodes in a changeset will be checked for overlap. If "-download_nodes=1" is also specified, way nodes will also be checked.

-download_changeset=1

Download each changeset and check for further potential issues (e.g. single- or zero-node ways, ways without tags, etc.)

-download_nodes=1

Also individually download nodes for ways in a changeset. Recommended only for very small changesets.

-building=14

If "-download_changeset=1" is specified and this parameter is too, buildings that iD users might have inadvertantly converted from residential areas will be reported if they contain more than this number of nodes.

-report_overlap_nodes=1

Attempt to report all nodes in a changeset that overlap the bounding box, not just the fact that some nodes overlap. Requires that "-download_changeset=1" is also set.

Finally

It's still very much a work in progress - there is lots of tidying up that remains to be done.

SomeoneElseOSM/Changeset1

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