Re: [HOT] Spot-6 images of Guinée / Northern Liberia available, job 489
Hi Michael, Le 05/04/2014 21:25, Michael Judex a écrit : > Thanks for the answer! I've another related question/issue: There is a > systematic geometric shift between SPOT-6 images of task 489 (Guinée / > Northern Liberia border area) and Pleiades-1A images of task 471 (only > for the town of Macenta, which is included geographically in 489). I > think that an offset of 10.44; 14.24 (in JOSM) for the SPOT-6 images > is good to have a proper fit to the Pleiades images. > > So my questions are: > - is the geometric accuracy of the Pleiades better than SPOT-6? (I > assume yes) Yes, Pleiades has 6.5 m CE90 location accuracy, and SPOT-6 10 m CE90 location accuracy. > - do we then have a systematic geometeric distortion in task 489 for > the edits that relied only on the SPOT-6 imagery? If yes can we > correct this? (maybe the the only way to really fix offsets between > different images are GPS ground control points...) The shift in Macenta doesn't mean that the same offset there would be suitable for the whole SPOT-6 imagery. It is likely suitable only for the area near Macenta. Geometric distortions are for example likely to depend on relief, in a way more complex than a simple uniform offset could fix. > > I think it could be helpful to have an instant overview of ALL > available imagery for a specific area. If a mapper opens a task only > the dedicated imagery is listed in the task instructions. Is there a > simple way to achieve this? You can simply overlay the Pleiades imagery for one of the Pleiades jobs (469 or 471 for Guéckédou or Macenta - both contain the same Pleiades layer, with Kissidougou too ; and the Pleiades imagery layer for job http://tasks.hotosm.org/job/487 for Foya contains the 4 Pleiades images) to the SPOT-6 imagery of job http://tasks.hotosm.org/job/489. And switch them on and off to compare (which is what you probably did, explaining here for the others). A better answer to your question : on VISOV's Umap used to track news about the Ebola outbreak, boundaries for high resolution imagery layers can be switched on and off (in the layer menu, icon is near top left) (grouped by when they where made available) : http://umap.openstreetmap.fr/fr/map/esov-suivi-epidemie-ebola_6356#10/8.5640/-9.7806 > > Thanks for your support! > > Michael Thanks for your questions, and for your mapping! Jean-Guilhem > > > > Am 05.04.2014 11:19, schrieb Pierre Béland: >> Great. Thanks both. >> >> Pierre >> >> >> *De :* Jean-Guilhem Cailton >> *À :* Michael Judex ; hot@openstreetmap.org >> *Envoyé le :* Vendredi 4 avril 2014 22h10 >> *Objet :* Re: [HOT] Spot-6 images of Guinée / Northern Liberia >> available, job 489 >> >> Hi Michael, >> >> The existing roads were probably based on Landsat, the geometric >> accuracy of which is lower than Spot-6. So if you feel that adjustment >> is needed, the pre-existing road should probably be adjusted. This would >> also make it possible to have a consistent geometry for tracing streets >> and buildings within villages and towns. >> >> Best wishes, >> >> Jean-Guilhem > ___ HOT mailing list HOT@openstreetmap.org https://lists.openstreetmap.org/listinfo/hot
Re: [HOT] Spot-6 images of Guinée / Northern Liberia available, job 489
Thanks for the answer! I've another related question/issue: There is a systematic geometric shift between SPOT-6 images of task 489 (Guinée / Northern Liberia border area) and Pleiades-1A images of task 471 (only for the town of Macenta, which is included geographically in 489). I think that an offset of 10.44; 14.24 (in JOSM) for the SPOT-6 images is good to have a proper fit to the Pleiades images. So my questions are: - is the geometric accuracy of the Pleiades better than SPOT-6? (I assume yes) - do we then have a systematic geometeric distortion in task 489 for the edits that relied only on the SPOT-6 imagery? If yes can we correct this? (maybe the the only way to really fix offsets between different images are GPS ground control points...) I think it could be helpful to have an instant overview of ALL available imagery for a specific area. If a mapper opens a task only the dedicated imagery is listed in the task instructions. Is there a simple way to achieve this? Thanks for your support! Michael Am 05.04.2014 11:19, schrieb Pierre Béland: Great. Thanks both. Pierre *De :* Jean-Guilhem Cailton *À :* Michael Judex ; hot@openstreetmap.org *Envoyé le :* Vendredi 4 avril 2014 22h10 *Objet :* Re: [HOT] Spot-6 images of Guinée / Northern Liberia available, job 489 Hi Michael, The existing roads were probably based on Landsat, the geometric accuracy of which is lower than Spot-6. So if you feel that adjustment is needed, the pre-existing road should probably be adjusted. This would also make it possible to have a consistent geometry for tracing streets and buildings within villages and towns. Best wishes, Jean-Guilhem ___ HOT mailing list HOT@openstreetmap.org https://lists.openstreetmap.org/listinfo/hot
Re: [HOT] Spot-6 images of Guinée / Northern Liberia available, job 489
Merci Fofana, et bons cartoparties a tous. Pierre De : FOFANA BAZO BAGNOUMANA À : Jean-Guilhem Cailton Cc : "hot@openstreetmap.org" Envoyé le : Vendredi 4 avril 2014 18h23 Objet : Re: [HOT] Spot-6 images of Guinée / Northern Liberia available, job 489 nous voyons à travers ces éléments comment le projet hot évolue et il vraiment important de souligner ces aspects. l'acquisition d'imageries de telles niveaux de précisions est d'un grand intérêt pour la cartographie de crise. Toutes mes félicitations à l'équipe qui a rendue cela possible, et que les mappers en fassent un très bon usage. bravo à tous. Fofana pour osm_BF 2014-04-04 16:16 GMT+00:00 Jean-Guilhem Cailton : Hi, > >Another version of the Spot-6 layer, with the near-infrared band used as >"red" in red-green-blue (instead of the natural red band) is available. > >It provides a nice view of vegetation (in red), and thus also makes it >easy to see residential areas and rivers. > >To add it, replace "spot6" by "spot6_nir" in the URL given in >http://tasks.hotosm.org/job/489 > >Best wishes, > >Jean-Guilhem > > >Le 04/04/2014 15:26, Jean-Guilhem Cailton a écrit : > >> Hi, >> >> Airbus Defence and Space, Geo-Intelligence has donated Spot-6 images, >> acquired between 2013-10-13 and 2013-12-11, that cover a large part of >> the area of the border between Northern Liberia and Southern Guinea, >> including the towns of Voinjama and Kolahun in Liberia, as well as the >> cities of Guéckédou and Macenta in Guinée, and their surroundings. >> >> Job 489 has been set up on the Tasking Manager: >> http://tasks.hotosm.org/job/489 >> >> For the cities of Guéckédou and Macenta, where higher resolution >> Pleiades images are available and that were already mapped (jobs 469 and >> 471), it is better to keep using the Pleiades images as geometrical >> reference, as they have better accuracy (6.5 m CE 90 without GCPs). >> >> Use source=Spot-6, Airbus >> >> Best wishes, >> >> Jean-Guilhem >> >> >> ___ >> HOT mailing list >> HOT@openstreetmap.org >> https://lists.openstreetmap.org/listinfo/hot >> > > >___ >HOT mailing list >HOT@openstreetmap.org >https://lists.openstreetmap.org/listinfo/hot > -- Fofana Bagnoumana Bazo Etudiant en Master II (Géographie, Gestion des Ressources Naturelles) A l'université de Ouagadougou ___ HOT mailing list HOT@openstreetmap.org https://lists.openstreetmap.org/listinfo/hot___ HOT mailing list HOT@openstreetmap.org https://lists.openstreetmap.org/listinfo/hot
Re: [HOT] Pleiades image of Foya available, job being set up
Writing rapidly from SOTM-fr That is fantastic to see this response with as usual Jean-Guilhem Cailton for imagery, OSM-fr for hosting imagery. This week we had image offered by DigitalGlobe / Mapbox and Airbus Defense and Space from which we received yesterday a large image around Gueckenou and in the neighboring area in Liberia. Thanks to all of those who organize mapping parties for this activation. Please send a twitter about your mapping party, give us some news and update the wiki page to list your mapping party. See http://tasks.hotosm.org/job/489 To see the list of current Task manager jobs for this Ebola Activation http://tasks.hotosm.org/#featured/Ebola The wiki coordination page is at https://wiki.openstreetmap.org/wiki/2014_West_Africa_Ebola_Response 2014 West Africa Ebola Response - OpenStreetMa... Help Available languages • English • français Other languages — Help us translating this wiki Afficher sur wiki.openstreetm... Aperçu par Yahoo Thanks again to all. Pierre De : frmoine À : hot@openstreetmap.org Envoyé le : Vendredi 4 avril 2014 17h10 Objet : Re: [HOT] Pleiades image of Foya available, job being set up + 1000 : ) thanks . T ___ HOT mailing list HOT@openstreetmap.org https://lists.openstreetmap.org/listinfo/hot___ HOT mailing list HOT@openstreetmap.org https://lists.openstreetmap.org/listinfo/hot
Re: [HOT] imagery request coordination tool
This is a discussion we already had for Haiyan on the Coordination room with OCHA and Red Cross. For major activations, it would surely be important to have an Imagery monitoring tool that give to various actors the capacity to visualize the same info, add various entries / tickets containing AOI's bbox coordinates. A map could synthetise the various AOI's and imageries available, the possibility of the various actors to comment on a specific task / request would be also important. For Haiyan, while we had many imageries for Tacloban, there were areas where it took a long delay to obtain imagery. To have a better Imagery Monitoring tools would surely have helped. One essential aspect we should not forget, it is important that the coordinators be informed of the various groups that try to find imagery. Pierre De : Alex Barth À : Mikel Maron Cc : "hot@openstreetmap.org" Envoyé le : Vendredi 4 avril 2014 21h13 Objet : Re: [HOT] imagery request coordination tool Mikel - Right on, we need to work on coordinating imagery needs in emergencies. I've been involved a couple of times in the past in sourcing imagery for emergencies and the key challenge for someone who's between the responding community and potential sources like e. g. Digital Globe is to: a) find out what is needed b) find out who is already trying to source what is needed The resulting confusion are me sending out obnoxiously duplicative questions in times where I shouldn't waste people's time. As the specs for a software tool are coming together here I have a suggestion for a very bare minimum measure: Use a Github repo and issues for requesting imagery. Each issue should describe the imagery needed with a http://geojson.io/ polygon describing the extent and should say what resolution is needed / purpose the imagery is needed for. There is one repo per incident. As soon as someone starts sourcing imagery they should say so on the corresponding issue. You could easily iterate from such a practice to a more integrated tool. Alex On Fri, Apr 4, 2014 at 2:50 PM, Mikel Maron wrote: Hi Everyone > > >In conversation among the Guinea Ebola activation coordinators, we discussed >the need and potential for a software tool for coordination of imagery >requests. I wanted to share that idea here, and maybe we can expand on the >requirements and possible implementations on list and at the technical working >group. > > >We have more options than ever for imagery for activations, and a lot of >conversations going on at once. What's needed is something to collectively >coordinate our options, to avoid inevitable crossing of wires. > > >Such a system would include >* Make and track Area of Instance boundaries. >* Form for standard set of questions when requesting imagery (ie justifying >humanitarian need) >* Show available Bing imagery for those areas. >* Show available imagery from other providers. >* Links to associated tasking manager jobs. >* Comments/interaction on each AOI, so coordinators and imagery providers can >stay informed of progress. >* Flexible permission/visibility. > > >Look forward to hearing from those interested on this idea! >Mikel > >* Mikel Maron * +14152835207 @mikel s:mikelmaron >___ >HOT mailing list >HOT@openstreetmap.org >https://lists.openstreetmap.org/listinfo/hot > > ___ HOT mailing list HOT@openstreetmap.org https://lists.openstreetmap.org/listinfo/hot___ HOT mailing list HOT@openstreetmap.org https://lists.openstreetmap.org/listinfo/hot
Re: [HOT] Spot-6 images of Guinée / Northern Liberia available, job 489
Great. Thanks both. Pierre De : Jean-Guilhem Cailton À : Michael Judex ; hot@openstreetmap.org Envoyé le : Vendredi 4 avril 2014 22h10 Objet : Re: [HOT] Spot-6 images of Guinée / Northern Liberia available, job 489 Hi Michael, The existing roads were probably based on Landsat, the geometric accuracy of which is lower than Spot-6. So if you feel that adjustment is needed, the pre-existing road should probably be adjusted. This would also make it possible to have a consistent geometry for tracing streets and buildings within villages and towns. Best wishes, Jean-Guilhem Le 04/04/2014 21:05, Michael Judex a écrit : > Dear all, > > I'm just starting to map roads etc. for this job with the SPOT-6 > imagery in NIR. The already existing major roads have a significant > offset to the satellite image (e.g. major road from Macenta to > Voinjama). Should the offset be corrected or is the geometric > correction of the SPOT images not sufficient? > > thanks, > Michael > > Am 04.04.2014 15:26, schrieb Jean-Guilhem Cailton: >> Hi, >> >> Airbus Defence and Space, Geo-Intelligence has donated Spot-6 images, >> acquired between 2013-10-13 and 2013-12-11, that cover a large part of >> the area of the border between Northern Liberia and Southern Guinea, >> including the towns of Voinjama and Kolahun in Liberia, as well as the >> cities of Guéckédou and Macenta in Guinée, and their surroundings. >> >> Job 489 has been set up on the Tasking Manager: >> http://tasks.hotosm.org/job/489 >> >> For the cities of Guéckédou and Macenta, where higher resolution >> Pleiades images are available and that were already mapped (jobs 469 and >> 471), it is better to keep using the Pleiades images as geometrical >> reference, as they have better accuracy (6.5 m CE 90 without GCPs). >> >> Use source=Spot-6, Airbus >> >> Best wishes, >> >> Jean-Guilhem >> >> >> ___ >> HOT mailing list >> HOT@openstreetmap.org >> https://lists.openstreetmap.org/listinfo/hot > > > ___ > HOT mailing list > HOT@openstreetmap.org > https://lists.openstreetmap.org/listinfo/hot > ___ HOT mailing list HOT@openstreetmap.org https://lists.openstreetmap.org/listinfo/hot___ HOT mailing list HOT@openstreetmap.org https://lists.openstreetmap.org/listinfo/hot
