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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>It’s worth noting that the OSM API is for editing the map data, and if someone were to apply this solution to more than a few mappers who hadn’t made any changesets they’d run a chance of getting blocked. See <a href="https://wiki.openstreetmap.org/wiki/API_usage_policy">https://wiki.openstreetmap.org/wiki/API_usage_policy</a>.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>I believe the changeset query is one of the more expensive ones.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>There aren’t any great solutions yet for small-scale historical analysis.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div style='border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in 4.0pt'><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Pierre Béland [mailto:pierzenh@yahoo.fr] <br><b>Sent:</b> Friday, May 31, 2013 8:38 PM<br><b>To:</b> Paul Norman; 'william skora'; dev@openstreetmap.org<br><b>Subject:</b> Re: [OSM-dev] Querying Changeset Tags in OSM API<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><div><div><div><div><div><p class=MsoNormal style='background:white'><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>I work with Will on the CAP103 project and succeeded yesterday to calculate daily statistics for the CAP103 geographic zone.<br>I adapted a python script originally written by Sebastien Pierrel. The OsmApi module contains changeset functions that are usefull to interrogate the OSM API and obtain the history of objects.<br><br>For a BBOX, a specific contributor and a date range, we can interrogate the OSM API an list the changesets. Below are examples for changeset ID=16327554. <br><br>And looking more in detail about the Changeset function, I see that there are collection of objects edited. We should be able with this historical data to calculate more detailed statistics (ie. objects created, modified, deleted).<br><br>It is quitee easy to treat this with Python script but there might be some limits when interrogating the OSM API. Then, it is possible to shorten the period analyzed.</span><span style='color:black'><o:p></o:p></span></p></div></div></div></div></div></div></div></body></html>