<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_1430681712676_178842">Hi Michael,</div><div id="yui_3_16_0_1_1430681712676_178841"><br></div><div id="yui_3_16_0_1_1430681712676_178840">It would greatly help us if people who have trekked in these areas send us gps traces. These long paths woud be useful, plus village names.<br></div><div id="yui_3_16_0_1_1430681712676_178772"><span></span></div><div id="yui_3_16_0_1_1430681712676_178771"><div id="yui_3_16_0_1_1430681712676_178839">I sent a twitter yesterday to sollicit receiving these gps traces. People should write to activation @ hotosm.org</div><div dir="ltr" id="yui_3_16_0_1_1430681712676_178838"><a id="yui_3_16_0_1_1430681712676_178868" href="https://twitter.com/pierzen/status/594786000729186304">https://twitter.com/pierzen/status/594786000729186304</a><br> </div><div style="" class="" id="yui_3_16_0_1_1430681712676_178838"> </div></div><div id="yui_3_16_0_1_1430681712676_178770" class="signature"><span id="yui_3_16_0_1_1430681712676_178875" style="font-style:italic;color:rgb(0, 0, 191);font-weight:bold;"> <br><font id="yui_3_16_0_1_1430681712676_178874" face="garamond, new york, times, serif">Pierre </font><br></span></div><br> <div id="yui_3_16_0_1_1430681712676_178776" style="font-family: verdana, helvetica, sans-serif; font-size: 13px;"> <div id="yui_3_16_0_1_1430681712676_178775" style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div id="yui_3_16_0_1_1430681712676_178774" dir="ltr"> <hr id="yui_3_16_0_1_1430681712676_178773" size="1"> <font id="yui_3_16_0_1_1430681712676_178873" face="Arial" size="2"> <b id="yui_3_16_0_1_1430681712676_178921"><span id="yui_3_16_0_1_1430681712676_178920" style="font-weight:bold;">De :</span></b> Michael Krämer <ohrosm@gmail.com><br> <b><span style="font-weight: bold;">À :</span></b> "HOT@openstreetmap.org" <hot@openstreetmap.org> <br> <b id="yui_3_16_0_1_1430681712676_178923"><span id="yui_3_16_0_1_1430681712676_178922" style="font-weight: bold;">Envoyé le :</span></b> Lundi 4 mai 2015 2h56<br> <b id="yui_3_16_0_1_1430681712676_178925"><span id="yui_3_16_0_1_1430681712676_178924" style="font-weight: bold;">Objet :</span></b> Re: [HOT] data alignment to satellite imagery<br> </font> </div> <div id="yui_3_16_0_1_1430681712676_178777" class="y_msg_container"><br><div id="yiv4547534347"><div id="yui_3_16_0_1_1430681712676_178781"><div id="yui_3_16_0_1_1430681712676_178780" dir="ltr"><div id="yui_3_16_0_1_1430681712676_178779"><div id="yui_3_16_0_1_1430681712676_178778"><div class="qtdSeparateBR"><br><br></div><div class="yiv4547534347yqt2217882096" id="yiv4547534347yqtfd46355">Hi,</div><br clear="none"><br clear="none"></div>for me the "gold standard" for image alignment in OSM are gpx traces with high quality. If no traces are available - which likely applies to most of Nepal - Bing is the standard to use. In either case adjust any other imagery to match the alignment of the standard.<br clear="none"></div><div><br clear="none"></div><div>But now the limitation: Some of the imagery currently in use with HOT shows some difference compared to Bing. But this is not a simple shift. To my limited understanding this comes from the correction applied to the image. Especially in mountains this is difficult - which likely is especially true for the Himalayas. But keep the distances in mind: With high resolution images a shift of let's say 10 m is pretty visible - but should not really matter too much in real live.<br clear="none"><br clear="none"></div><div>In any case: Try to align any of your work with Bing. Leave any misaligned data for now.<br clear="none"></div><div><br clear="none"></div>Michael (user Ohr)<div class="yiv4547534347yqt2217882096" id="yiv4547534347yqtfd07081"><br clear="none"></div></div></div></div><br><div class="yqt2217882096" id="yqtfd94326">_______________________________________________<br clear="none">HOT mailing list<br clear="none"><a shape="rect" ymailto="mailto:HOT@openstreetmap.org" href="mailto:HOT@openstreetmap.org">HOT@openstreetmap.org</a><br clear="none"><a shape="rect" href="https://lists.openstreetmap.org/listinfo/hot" target="_blank">https://lists.openstreetmap.org/listinfo/hot</a><br clear="none"></div><br><br></div> </div> </div> </div></body></html>