[talk-ph] Be careful in tracing from Bing Maps
Hi guys, Please be careful in tracing from Bing Maps aerial imagery. It is known that some of the imagery is not aligned to the correct position. To show an example, please see this Bing maps screenshot: [1]. The image shows the boundary between two satellite imagery. The imagery on the top covers Metro Manila is is for the most part correctly positioned. The imagery at the bottom covers parts of Cavite, Laguna, Batangas, and Rizal[3] and is *not* positioned correctly. Notice that the residential streets do not line up. In order to avoid the misaligned imagery problem that has been plaguing contributors in Google Map Maker, please try to align the imagery to GPS tracks or known good data before tracing. In Potlatch 2 and Merkaartor 0.17, the imagery can be moved by pressing down the spacebar then dragging. I don't know how to do this in JOSM but it also has a way to move the background image. [1] http://wiki.openstreetmap.org/wiki/File:Bing_misalignment_in_Daang_Hari_-_Bacoor.jpg [2] http://www.openstreetmap.org/?way=28738861 [3] http://www.openstreetmap.org/?way=87284547 ___ talk-ph mailing list talk-ph@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-ph
Re: [talk-ph] Be careful in tracing from Bing Maps
Here's an example of aligning Bing Maps imagery. This first image shows the default view of Bing Maps in Potlatch 2 and with GPS traces loaded (the yellow arrows show the offset needed to align the imagery): http://wiki.openstreetmap.org/wiki/File:Bing_not_yet_aligned_in_GMA,_Cavite.jpg This next image shows the Bing Maps layer moved to provide a best fit alignment with the GPS traces: http://wiki.openstreetmap.org/wiki/File:Bing_now_aligned_in_GMA,_Cavite.jpg This last image shows streets traced from Bing Maps now that it is aligned: http://wiki.openstreetmap.org/wiki/File:Bing_now_aligned_and_traced_in_GMA,_Cavite.jpg Tips: When trying to align the image, look over a larger area where GPS traces are available and do a best fit over that area. In addition, the best spots to inspect for alignments are intersections and curves in the roads. On Thu, Jan 6, 2011 at 2:03 AM, Eugene Alvin Villar wrote: > Hi guys, > > Please be careful in tracing from Bing Maps aerial imagery. It is > known that some of the imagery is not aligned to the correct position. > To show an example, please see this Bing maps screenshot: [1]. The > image shows the boundary between two satellite imagery. The imagery on > the top covers Metro Manila is is for the most part correctly > positioned. The imagery at the bottom covers parts of Cavite, Laguna, > Batangas, and Rizal[3] and is *not* positioned correctly. Notice that > the residential streets do not line up. > > In order to avoid the misaligned imagery problem that has been > plaguing contributors in Google Map Maker, please try to align the > imagery to GPS tracks or known good data before tracing. > > In Potlatch 2 and Merkaartor 0.17, the imagery can be moved by > pressing down the spacebar then dragging. I don't know how to do this > in JOSM but it also has a way to move the background image. > > > [1] > http://wiki.openstreetmap.org/wiki/File:Bing_misalignment_in_Daang_Hari_-_Bacoor.jpg > [2] http://www.openstreetmap.org/?way=28738861 > [3] http://www.openstreetmap.org/?way=87284547 > -- http://vaes9.codedgraphic.com ___ talk-ph mailing list talk-ph@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-ph
Re: [talk-ph] Be careful in tracing from Bing Maps
the one i'm using on windows: JOSM (version 3767) While Bing Imagery & GPS traces are shown on the JOSM's background: click on menu: Imagery --> New offset then a new window will pop-up "Adjust imagery offset" (with Easting / Northing correction & Bookmark name) while this pop-up is showing, -use mouse "left-button" to drag, align/correct offset of Bing Imagery -use mouse "right-button" to pan & drag the entire workspace, to check & verify if your "offset correction" is the best-fit for the particular area. re-adjust (using left-button) as necessary. once you are happy with the offset, you may want to bookmark that particular offset settings for that particular place on JOSM by saving it under a "bookmark name" -- To access the particular bookmarked "offset/correction", click Imagery->New offset to delete/manage Offset bookmarks: press F12 ---> WMS/TMS button --> Offset bookmarks (tab) On Thu, Jan 6, 2011 at 2:33 AM, Eugene Alvin Villar wrote: > Here's an example of aligning Bing Maps imagery. > > This first image shows the default view of Bing Maps in Potlatch 2 and > with GPS traces loaded (the yellow arrows show the offset needed to > align the imagery): > http://wiki.openstreetmap.org/wiki/File:Bing_not_yet_aligned_in_GMA,_Cavite.jpg > > This next image shows the Bing Maps layer moved to provide a best fit > alignment with the GPS traces: > http://wiki.openstreetmap.org/wiki/File:Bing_now_aligned_in_GMA,_Cavite.jpg > > This last image shows streets traced from Bing Maps now that it is aligned: > http://wiki.openstreetmap.org/wiki/File:Bing_now_aligned_and_traced_in_GMA,_Cavite.jpg > > Tips: When trying to align the image, look over a larger area where > GPS traces are available and do a best fit over that area. In > addition, the best spots to inspect for alignments are intersections > and curves in the roads. > > > > On Thu, Jan 6, 2011 at 2:03 AM, Eugene Alvin Villar wrote: >> Hi guys, >> >> Please be careful in tracing from Bing Maps aerial imagery. It is >> known that some of the imagery is not aligned to the correct position. >> To show an example, please see this Bing maps screenshot: [1]. The >> image shows the boundary between two satellite imagery. The imagery on >> the top covers Metro Manila is is for the most part correctly >> positioned. The imagery at the bottom covers parts of Cavite, Laguna, >> Batangas, and Rizal[3] and is *not* positioned correctly. Notice that >> the residential streets do not line up. >> >> In order to avoid the misaligned imagery problem that has been >> plaguing contributors in Google Map Maker, please try to align the >> imagery to GPS tracks or known good data before tracing. >> >> In Potlatch 2 and Merkaartor 0.17, the imagery can be moved by >> pressing down the spacebar then dragging. I don't know how to do this >> in JOSM but it also has a way to move the background image. >> >> >> [1] >> http://wiki.openstreetmap.org/wiki/File:Bing_misalignment_in_Daang_Hari_-_Bacoor.jpg >> [2] http://www.openstreetmap.org/?way=28738861 >> [3] http://www.openstreetmap.org/?way=87284547 >> > > > > -- > http://vaes9.codedgraphic.com > > ___ > talk-ph mailing list > talk-ph@openstreetmap.org > http://lists.openstreetmap.org/listinfo/talk-ph > ___ talk-ph mailing list talk-ph@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-ph
Re: [talk-ph] Be careful in tracing from Bing Maps
Eugene Alvin Villar wrote, On Thursday, 06 January, 2011 02:03 AM: > In Potlatch 2 and Merkaartor 0.17, the imagery can be moved by > pressing down the spacebar then dragging. I don't know how to do this > in JOSM but it also has a way to move the background image. Brilliant. I didn't know you could do this in Potlatch. Had a quick look around JOSM and it doesn't immediately seem possible. Jim -- datalude: information security e: j...@datalude.com Philippines: +63 2 403 1311 / mob: +63 917 849 3939 Hong Kong: +852 6840 6693 w: http://www.datalude.com/ ___ talk-ph mailing list talk-ph@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-ph
Re: [talk-ph] Be careful in tracing from Bing Maps
Hi Jim, It is possible to do this on the "latest" JOSM. I was also surprised (and very happy) to discover this powerful new feature on JOSM. Because I used to manually enter 'numeric values' for offset corrections (Northings/Eastings), and It's a long trial & error process to get the best-fit; now it's just click & drag. very nice. And the other thing I love (on josm) is that you can 'bookmark' a lot of these offset values per working area. Note: (from experience), the offset correction is normally good only within 300-500 meter radius (from the center of your good reference area); after which, the imagery tends to shift slightly. Thus, to maintain good & tight alignments between uploaded gps traces & osm data, you have to recalibrate (offset) every half kilometer or so... in which case, bookmarking offsets can make your life a lot easier. :-) Rally On Thu, Jan 6, 2011 at 12:41 PM, Jim Morgan wrote: > Eugene Alvin Villar wrote, On Thursday, 06 January, 2011 02:03 AM: >> In Potlatch 2 and Merkaartor 0.17, the imagery can be moved by >> pressing down the spacebar then dragging. I don't know how to do this >> in JOSM but it also has a way to move the background image. > > Brilliant. I didn't know you could do this in Potlatch. Had a quick look > around JOSM and it doesn't immediately seem possible. > > Jim > > -- > > datalude: information security > e: j...@datalude.com > Philippines: +63 2 403 1311 / mob: +63 917 849 3939 > Hong Kong: +852 6840 6693 > w: http://www.datalude.com/ > > ___ > talk-ph mailing list > talk-ph@openstreetmap.org > http://lists.openstreetmap.org/listinfo/talk-ph > ___ talk-ph mailing list talk-ph@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-ph
Re: [talk-ph] Be careful in tracing from Bing Maps
Rally de Leon wrote, On Thursday, 06 January, 2011 12:04 PM: > the one i'm using on windows: JOSM (version 3767) > > While Bing Imagery & GPS traces are shown on the JOSM's background: > click on menu: Imagery --> New offset Don't seem to have that menu anywhere. I'm using the latest JOSM on Linux. Maybe the menu item is added with one of your plugins? What plugins are you running? Jim -- datalude: information security e: j...@datalude.com Philippines: +63 2 403 1311 / mob: +63 917 849 3939 Hong Kong: +852 6840 6693 w: http://www.datalude.com/ ___ talk-ph mailing list talk-ph@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-ph
Re: [talk-ph] Be careful in tracing from Bing Maps
JOSM Version 3767 (on Windows) looks like this: http://s232.photobucket.com/albums/ee315/ralleon888/?action=view¤t=JOSMVersion3767ImageryOffset.jpg No need for extra plug-in (it's built-in): http://s232.photobucket.com/albums/ee315/ralleon888/?action=view¤t=JOSMImageryOffsetPreference.jpg On Thu, Jan 6, 2011 at 2:05 PM, Jim Morgan wrote: > Rally de Leon wrote, On Thursday, 06 January, 2011 12:04 PM: > > the one i'm using on windows: JOSM (version 3767) > > > > While Bing Imagery & GPS traces are shown on the JOSM's background: > > click on menu: Imagery --> New offset > > Don't seem to have that menu anywhere. I'm using the latest JOSM on Linux. > Maybe the menu item is added with one of your plugins? What plugins are you > running? > > Jim > > -- > > datalude: information security > e: j...@datalude.com > Philippines: +63 2 403 1311 / mob: +63 917 849 3939 > Hong Kong: +852 6840 6693 >w: http://www.datalude.com/ > > ___ > talk-ph mailing list > talk-ph@openstreetmap.org > http://lists.openstreetmap.org/listinfo/talk-ph > ___ talk-ph mailing list talk-ph@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-ph
Re: [talk-ph] Be careful in tracing from Bing Maps
Rally de Leon wrote, On Thursday, 06 January, 2011 03:08 PM: > JOSM Version 3767 (on Windows) looks like this: > No need for extra plug-in (it's built-in): Indeed. Got it now. They must have sneaked that in in the last week or two! Good stuff. Jim -- datalude: information security e: j...@datalude.com Philippines: +63 2 403 1311 / mob: +63 917 849 3939 Hong Kong: +852 6840 6693 w: http://www.datalude.com/ ___ talk-ph mailing list talk-ph@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-ph
Re: [talk-ph] Be careful in tracing from Bing Maps
I checked the existing coverage of gps traces within bing areas. Aside from Jolo and Sanga-sanga all of them have GPS tracks we can calibrate the imagery. See josm shots here: http://www.flickr.com/photos/esambale/sets/72157625812711648/with/5350890259/ A few observations while eye-balling the images: - Cavite, Laguna, Batangas area have extensive traces, I think it is sufficient for calibration/adjustment - same goes for Iloilo and Cebu - Puerto princesa has good coverage on some grid like streets, however, I'm not sure if these are multiple traces. Is there a Palawan mapper here? - very few traces in Tacloban but there is a grid-like trace in Tanauan (center of the image) - Cagayan de Oro has very few traces. I added my personal trace (using 2 separate GPS units) along the trunk road. So far, it lined up pretty well. - Puerto galera's major roads are traced, however, the roads are too curvy. Unless it is a multiple trace I don't think we should calibrate the image. - For all other areas, the traces are very few. @ Rally, is there a way to share the offset bookmark in JOSM? I suspect this is just a config line within the .preferences file of JOSM. It would be good if we can share the bookmark to other josmers. On Thu, Jan 6, 2011 at 3:19 PM, Jim Morgan wrote: > Rally de Leon wrote, On Thursday, 06 January, 2011 03:08 PM: >> JOSM Version 3767 (on Windows) looks like this: >> No need for extra plug-in (it's built-in): > > Indeed. Got it now. They must have sneaked that in in the last week or two! > Good stuff. > > Jim > > > -- > > datalude: information security > e: j...@datalude.com > Philippines: +63 2 403 1311 / mob: +63 917 849 3939 > Hong Kong: +852 6840 6693 > w: http://www.datalude.com/ > > ___ > talk-ph mailing list > talk-ph@openstreetmap.org > http://lists.openstreetmap.org/listinfo/talk-ph > -- cheers, maning -- "Freedom is still the most radical idea of all" -N.Branden wiki: http://esambale.wikispaces.com/ blog: http://epsg4253.wordpress.com/ -- ___ talk-ph mailing list talk-ph@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-ph
