<html><body><div style="color:#000; background-color:#fff; font-family:verdana, helvetica, sans-serif;font-size:13px"><div id="yui_3_16_0_1_1427147406653_10278" dir="ltr">These heatmaps are interesting. <br></div><div id="yui_3_16_0_1_1427147406653_10904" dir="ltr"><br></div><div style="" class="" id="yui_3_16_0_1_1427147406653_10506" dir="ltr">Neis
changeset online map shows intensity of mapping only with the outset of the
bbox. Such heatmap could show the intensity of contribution in various
areas based on the number of objects.</div><div id="yui_3_16_0_1_1427147406653_10903" style="" class="" dir="ltr"><br style="" class=""></div><div id="yui_3_16_0_1_1427147406653_10873" dir="ltr">To use this functionality for an online map with Openlayers or similar javascript tool, we would surely need to aggregate the data. Otherwise, I dont see with a project like the Ebola outbreak, how we could manage nearly 16 millions objects to represent on the Heatmap.</div><div dir="ltr" id="yui_3_16_0_1_1427147406653_9953"><br></div><div id="yui_3_16_0_1_1427147406653_9955" class="signature"><span style="font-style:italic;color:rgb(0, 0, 191);font-weight:bold;"> <br><font face="garamond, new york, times, serif">Pierre </font><br></span></div><br> <div id="yui_3_16_0_1_1427147406653_9958" style="font-family: verdana, helvetica, sans-serif; font-size: 13px;"> <div id="yui_3_16_0_1_1427147406653_9957" style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div id="yui_3_16_0_1_1427147406653_9956" dir="ltr"> <hr id="yui_3_16_0_1_1427147406653_9993" size="1"> <font id="yui_3_16_0_1_1427147406653_9959" face="Arial" size="2"> <b><span style="font-weight:bold;">De :</span></b> Martin Dittus <martin@dekstop.de><br> <b><span style="font-weight: bold;">À :</span></b> Pierre Béland <pierzenh@yahoo.fr> <br><b><span style="font-weight: bold;">Cc :</span></b> hot <hot@openstreetmap.org> <br> <b><span style="font-weight: bold;">Envoyé le :</span></b> Lundi 23 mars 2015 18h32<br> <b><span style="font-weight: bold;">Objet :</span></b> Re: [HOT] Most "active" HOT projects since March 2014<br> </font> </div> <div id="yui_3_16_0_1_1427147406653_9960" class="y_msg_container"><br><br clear="none">Thanks for the detailed note Pierre! <br clear="none"><br clear="none">We seem to be on the same page — such stats are wonderfully misleading.<br clear="none"><br clear="none">I’ve tried grouping HOT projects in the past based on the available metadata and have indeed encountered all the obstacles you mention. Part of my motivation to share this was also to gently nudge project creators to tag more consistently :) Such metadata can be very useful for large-scale evaluations and visualisations.<br clear="none"><br clear="none">Pierre Béland <<a id="yui_3_16_0_1_1427147406653_10905" shape="rect" ymailto="mailto:pierzenh@yahoo.fr" href="mailto:pierzenh@yahoo.fr">pierzenh@yahoo.fr</a>> wrote:<br clear="none">> <br clear="none">> The best way to reflect the contributor activity is to go through the history and extract changesets corresponding to a bbox closed to the each Task Manager extent and corresponding to the period of the project.<br clear="none"><br clear="none">Yeah I’ve done that in the past on an older OSM history dump, that’s how this world map of HOT contributions was created:<br clear="none"><a id="yui_3_16_0_1_1427147406653_10906" shape="rect" href="https://twitter.com/dekstop/status/565211831720235009" target="_blank">https://twitter.com/dekstop/status/565211831720235009</a><br clear="none"><br clear="none">Although that image actually visualises individual edits, not just changesets.<div class="qtdSeparateBR"><br><br></div><div class="yqt4779990411" id="yqtfd01364"><br clear="none"><br clear="none">m.</div><br><br></div> </div> </div> </div></body></html>