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&layers=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
