<html><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:10pt"><div>Great. Thanks both.</div><div></div><div> </div><div><span style="font-style:italic;color:rgb(0, 0, 191);font-weight:bold;">Pierre <br></span><br></div> <div style="font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; font-size: 10pt;"> <div style="font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; font-size: 12pt;"> <div dir="ltr"> <hr size="1"> <font size="2" face="Arial"> <b><span style="font-weight:bold;">De :</span></b> Jean-Guilhem Cailton <jgc@arkemie.com><br> <b><span style="font-weight: bold;">À :</span></b> Michael Judex <m.judex@gmx.de>; hot@openstreetmap.org <br> <b><span style="font-weight: bold;">Envoyé le :</span></b> Vendredi 4 avril 2014 22h10<br> <b><span
style="font-weight: bold;">Objet :</span></b> Re: [HOT] Spot-6 images of Guinée / Northern Liberia available, job 489<br> </font> </div> <div class="y_msg_container"><br>Hi Michael,<br clear="none"><br clear="none">The existing roads were probably based on Landsat, the geometric<br clear="none">accuracy of which is lower than Spot-6. So if you feel that adjustment<br clear="none">is needed, the pre-existing road should probably be adjusted. This would<br clear="none">also make it possible to have a consistent geometry for tracing streets<br clear="none">and buildings within villages and towns.<br clear="none"><br clear="none">Best wishes,<br clear="none"><br clear="none">Jean-Guilhem<br clear="none"><br clear="none"><br clear="none">Le 04/04/2014 21:05, Michael Judex a écrit :<br clear="none">> Dear all,<br clear="none">><br clear="none">> I'm just starting to map roads etc. for this job with the SPOT-6<br clear="none">> imagery in
NIR. The already existing major roads have a significant<br clear="none">> offset to the satellite image (e.g. major road from Macenta to<br clear="none">> Voinjama). Should the offset be corrected or is the geometric<br clear="none">> correction of the SPOT images not sufficient?<br clear="none">><br clear="none">> thanks,<br clear="none">> Michael<br clear="none">><br clear="none">> Am 04.04.2014 15:26, schrieb Jean-Guilhem Cailton:<br clear="none">>> Hi,<br clear="none">>><br clear="none">>> Airbus Defence and Space, Geo-Intelligence has donated Spot-6 images,<br clear="none">>> acquired between 2013-10-13 and 2013-12-11, that cover a large part of<br clear="none">>> the area of the border between Northern Liberia and Southern Guinea,<br clear="none">>> including the towns of Voinjama and Kolahun in Liberia, as well as the<br clear="none">>> cities of Guéckédou and Macenta in
Guinée, and their surroundings.<br clear="none">>><br clear="none">>> Job 489 has been set up on the Tasking Manager:<br clear="none">>> <a shape="rect" href="http://tasks.hotosm.org/job/489" target="_blank">http://tasks.hotosm.org/job/489</a><br clear="none">>><br clear="none">>> For the cities of Guéckédou and Macenta, where higher resolution<br clear="none">>> Pleiades images are available and that were already mapped (jobs 469 and<br clear="none">>> 471), it is better to keep using the Pleiades images as geometrical<br clear="none">>> reference, as they have better accuracy (6.5 m CE 90 without GCPs).<br clear="none">>><br clear="none">>> Use source=Spot-6, Airbus<br clear="none">>><br clear="none">>> Best wishes,<br clear="none">>><br clear="none">>> Jean-Guilhem<br clear="none">>><br clear="none">>><br clear="none">>>
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