> At this point, I don't think we can get terribly deep in the weeds, other > than to focus on reflecting basic infrastructure that would be useful to > responders, e.g. road networks, communities, infrastructure, POIs and so on. > Location may be a bit fuzzy but content is likely more important to support > response.
Agree. Around Jacmel, I try to map the road network, POIs (most of them based on MINUSTAH data), residential areas (because they might be good to know for delivering aid), and landuse, in order to clearly separate residential from non-residential areas. I avoid mapping individual buildings, becuase the available imagery is not detailled enough, unless the buildings are large and important landmarks (a large hotel close the port of Jacmel, the arsenal in east to the center). -- Karl Am 20.01.2010 14:37, schrieb David G. Smith PE PLS: > I noticed some apparent shifting in DigitalGlobe imagery as well last night > - also noticed that some of the newer DigitalGlobe imagery around Jacmel was > not as clear as the prior imagery where I was working - hoping that > iterations of archival imagery might become available at some point as well. > > > In general, I think one of the issues we will continue to see is that I > believe there is little rectification vs. actual ground control as one might > have with conventional aerial orthophotos. > > At this point, I don't think we can get terribly deep in the weeds, other > than to focus on reflecting basic infrastructure that would be useful to > responders, e.g. road networks, communities, infrastructure, POIs and so on. > Location may be a bit fuzzy but content is likely more important to support > response. > > Jeff Harrison (CarbonProject) is also working on cascading WMS services > which may help to aggregate various Haiti mapping and imagery assets via one > URL for comparison and selecting between those available, as well as making > the WMS services more easy to use in JOSM/Merkaartor/etc - and that may be > very helpful as well. > > Just my $0.02... > > > David G. Smith PE PLS > Synergist Technology Group, Inc. > 570.280.6763 > > > -----Original Message----- > From: talk-boun...@openstreetmap.org [mailto:talk-boun...@openstreetmap.org] > On Behalf Of Karl Guggisberg > Sent: Wednesday, January 20, 2010 4:47 AM > To: talk@openstreetmap.org > Subject: Re: [OSM-talk] Jacmel Haiti, DigitalGlobe Imagery, and Road > Alignment > > Apparently, the digitalglobe imagery has been updated. I noticed when I was > mapping around Jacmel. I don't know whether the imagery is *better* aligned > but it its alignment is obviously different from the former image set (~ 50 > m offset?). > > -- Karl > > > Am 20.01.2010 05:20, schrieb David Fawcett: > >> Is there confirmation that the referencing/rectification of the >> Digital Globe is good/best. I hate to keep moving features around to >> chase the latest imagery. >> >> David. >> >> On Tue, Jan 19, 2010 at 4:27 PM, David G. Smith PE PLS >> <dsm...@synergist-tech.com> wrote: >> >> >>> I had digitized some of those roads and features around Jacmel late >>> last week from the DMA mapping, before the DigitalGlobe imagery or >>> other good sources were available, with the full anticipation that >>> they would eventually be updated via imagery. The bigger value to >>> the DMA maps as I saw it is that they had some local cultural >>> information such as POIs and place names, as well as basic road network. >>> >>> >>> >>> The DMA maps were scanned paper maps, rectified via NYPL MapWarper, >>> no surprise that they might be off a tad here and there. >>> >>> >>> >>> I have since then been updating via DigitalGlobe, tho there are still >>> some areas that need updating. >>> >>> >>> >>> So as far as "concern", there shouldn't be much, just stick with the >>> more current and update the older stuff - though be thoughtful when >>> deleting things outright. I think there is still some value to >>> knowing what potential road network there may be (even if it's tracks >>> not well visible from the air- I've found some that are shown on the >>> DMA maps but which are only barely discernible via tree crowns >>> vaguely outlining the road >>> underneath) and where there may be potential dwellings, et cetera >>> (potentially obscured by tree cover) - I have been designating some >>> of those more ambiguous ones (e.g. road network visible in DG >>> imagery, but buildings not obvious) as "residential area" as there is >>> probably a reason the roads are there. Obviously, if there is no >>> tree cover, there is less ambiguity, the road may just be off in >>> another direction, inaccurately placed on the DMA maps - worth >>> looking around for it before deleting it outright - I've found that to be >>> > the case in a few instances as well. > >>> >>> >>> >>> >>> David G. Smith PE PLS >>> >>> Synergist Technology Group, Inc. >>> >>> 570.280.6763 >>> >>> >>> >>> From: talk-boun...@openstreetmap.org >>> [mailto:talk-boun...@openstreetmap.org] >>> On Behalf Of Al Haraka >>> Sent: Tuesday, January 19, 2010 2:59 PM >>> To: Brad Neuhauser >>> Cc: talk@openstreetmap.org >>> Subject: Re: [OSM-talk] Jacmel Haiti, DigitalGlobe Imagery, and Road >>> Alignment >>> >>> >>> >>> So it seems the consensus is to stick with DG, despite its problems. >>> When something better comes along, we start using that. Am I >>> following correctly? Some of the old stuff, especially the 1987 map, >>> > concerned me. > >>> On Tue, Jan 19, 2010 at 2:48 PM, Brad >>> Neuhauser<brad.neuhau...@gmail.com> >>> wrote: >>> >>> At least that was my assumption. Even if the DG imagery is off, it's >>> more up-to-date than the 1987 map, so I moved the roads to align with >>> the DG imagery. Much of the city (esp central city, north) has been >>> realigned with the DG imagery. I also removed some streets traced >>> from the map that were clearly wrong, and tagged some others with the >>> fixme tag. Also, see the Street Names page for link to UN maps you >>> can use for additional info. >>> http://wiki.openstreetmap.org/wiki/WikiProject_Haiti/Street_names >>> >>> Brad (neuhausr) >>> >>> On Tue, Jan 19, 2010 at 1:42 PM, Karl Guggisberg >>> <karl.guggisb...@guggis.ch> wrote: >>> >>> >>>> Hi, >>>> >>>> I have the same problem. Brad Neuhauser said on the crisismapping >>>> list that lot of work has been done before digitalglobe was >>>> available. In particular, an old CIA map has been used, there are a >>>> lot of objects with a source tag refering to it. I've started to >>>> delete individual buildings which are obviously badly off. I'm not >>>> sure whether the digitalglobe imagery is correctly rectified, >>>> thought. Anybody? >>>> >>>> Regards >>>> Karl >>>> >>>> Am 19.01.2010 20:24, schrieb Al Haraka: >>>> >>>> All, >>>> >>>> I understand we are all busy, but I have some Haiti questions. The >>>> area around Jacmel in the south appears to be very messy at the >>>> moment, and I am only focusing on roads and basic infrastructure. >>>> The roads seem very far off, and at times some do not even seem to >>>> point to an artifact I can see in the imagery. >>>> >>>> http://www.openstreetmap.org/?lat=18.22381&lon=-72.52094&zoom=16&lay >>>> ers=B000FTF I have tried cleaning it up using the DigitalGlobe >>>> imagery, which I have assumed to be the best. Am I wrong here? >>>> What are other people using and what are the current >>>> recommendations? Am I doing a bad job or wasting my time aligning >>>> the roads if they are this far off? I realize my use of DG may bias >>>> me, and I have not taken the time to compare. That being said, I >>>> heard it was the most recent and expansive. >>>> Sorry for the newbishness here. I just want to help, and I heard >>>> Jacmel and all points south will be needed soon. >>>> Regards, >>>> _AJS >>>> >>>> -- >>>> Alexander J. Stein >>>> Cell: (201) 412-9479 >>>> Email: alhar...@gmail.com >>>> Skype: alexander.j.stein >>>> AIM: elduderino6886 >>>> >>>> _______________________________________________ >>>> talk mailing list >>>> talk@openstreetmap.org >>>> http://lists.openstreetmap.org/listinfo/talk >>>> >>>> >>>> _______________________________________________ >>>> talk mailing list >>>> talk@openstreetmap.org >>>> http://lists.openstreetmap.org/listinfo/talk >>>> >>>> >>>> >>>> >>> _______________________________________________ >>> talk mailing list >>> talk@openstreetmap.org >>> http://lists.openstreetmap.org/listinfo/talk >>> >>> >>> -- >>> Alexander J. Stein >>> Cell: (201) 412-9479 >>> Email: alhar...@gmail.com >>> Skype: alexander.j.stein >>> AIM: elduderino6886 >>> >>> _______________________________________________ >>> talk mailing list >>> talk@openstreetmap.org >>> http://lists.openstreetmap.org/listinfo/talk >>> >>> >>> >>> >> _______________________________________________ >> talk mailing list >> talk@openstreetmap.org >> http://lists.openstreetmap.org/listinfo/talk >> >> >> > _______________________________________________ > talk mailing list > talk@openstreetmap.org > http://lists.openstreetmap.org/listinfo/talk > > > _______________________________________________ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
