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<span style="font-family: Calibri,Arial,Helvetica,sans-serif; font-size: 12pt;">Hi Animesh,</span><br>
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<span style="font-family: Calibri,Arial,Helvetica,sans-serif; font-size: 12pt;">You can check out the vandalism page on the OSM Wiki that provides a pretty good overview about OSM vandalism and the challenge of detecting it [0].
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<span style="font-family: Calibri,Arial,Helvetica,sans-serif; font-size: 12pt;">I think a binary classification won't be as straightforward for creating a wide sweeping 'vandal detection' tool because the problem of vandalism in OSM is multifaceted: you can
change many objects in one changeset and each object itself has multiple dimensions (there's the spatial dimensions--shape, detail, etc.--and then there's the data property dimensions). In addition, sometimes the line between poor quality edits and vandalism
is very thin, so vandalism may not be the result of malice but rather just an uninformed editor.</span><br>
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<p><span style="font-family: Calibri,Arial,Helvetica,sans-serif; font-size: 12pt;">Thus, for a binary classification, it would be useful to focus on one type of vandalism. Perhaps it could be detecting doodles (in which case you could search for data that isn't
normal shaped: small angles, very high detail, and so on). Or it could be finding times when people are </span><span style="font-family: Calibri,Arial,Helvetica,sans-serif; font-size: 12pt;">deleting a lot of data. I started a form that aims to collect "bad"
edits in general [1], but I haven't really advertised it and thus don't have data that could help inform which direction would be most commonly found.</span></p>
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<p><span style="font-family: Calibri,Arial,Helvetica,sans-serif; font-size: 12pt;">You may also check out some of the projects that have implemented parts of the algorithms listed on the wiki page for further inspiration</span><span style="font-family: Calibri,Arial,Helvetica,sans-serif; font-size: 12pt;">
[2,3,4].</span></p>
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<p><span style="font-family: Calibri,Arial,Helvetica,sans-serif; font-size: 12pt;">B</span><span style="font-family: Calibri,Arial,Helvetica,sans-serif; font-size: 12pt;">est,</span><br>
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<p><span style="font-family: Calibri,Arial,Helvetica,sans-serif; font-size: 12pt;">Ethan aka FTA</span></p>
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<p><span style="font-family: Calibri,Arial,Helvetica,sans-serif; font-size: 12pt;">[0]: </span><a href="http://wiki.openstreetmap.org/wiki/Vandalism" class="OWAAutoLink"><span style="font-family: Calibri,Arial,Helvetica,sans-serif; font-size: 12pt;">http://wiki.openstreetmap.org/wiki/Vandalism</span></a></p>
<p><span style="font-family: Calibri,Arial,Helvetica,sans-serif; font-size: 12pt;">[1]:
</span><a href="https://docs.google.com/forms/d/e/1FAIpQLSf4bVukO5OUXviSujW1gUtM1NTroTz3lPsXy7EcKxIp8ZzX5g/viewform" class="OWAAutoLink"><span style="font-family: Calibri,Arial,Helvetica,sans-serif; font-size: 12pt;">https://docs.google.com/forms/d/e/1FAIpQLSf4bVukO5OUXviSujW1gUtM1NTroTz3lPsXy7EcKxIp8ZzX5g/viewform</span></a></p>
<p><span style="font-family: Calibri,Arial,Helvetica,sans-serif; font-size: 12pt;">[2]:
</span><a href="http://www.mdpi.com/2220-9964/1/3/315" class="OWAAutoLink"><span style="font-family: Calibri,Arial,Helvetica,sans-serif; font-size: 12pt;">http://www.mdpi.com/2220-9964/1/3/315</span></a></p>
<p><span style="font-family: Calibri,Arial,Helvetica,sans-serif; font-size: 12pt;">[3]:
</span><a href="https://github.com/willemarcel/osmcha-django" class="OWAAutoLink"><span style="font-family: Calibri,Arial,Helvetica,sans-serif; font-size: 12pt;">https://github.com/willemarcel/osmcha-django</span></a></p>
<p><span style="font-family: Calibri,Arial,Helvetica,sans-serif; font-size: 12pt;">[4]:
</span><a href="https://github.com/ethan-nelson/osm_hall_monitor" class="OWAAutoLink"><span style="font-family: Calibri,Arial,Helvetica,sans-serif; font-size: 12pt;">https://github.com/ethan-nelson/osm_hall_monitor</span></a></p>
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