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 > <http://www.openstreetmap.org/?lat=18.22381&lon=-72.52094&zoom=16&layers=B000FTF> > &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
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