Re: [talk-ph] Tubbataha is way off
Investigating on this further, I plotted the Tubbataha Reefs Natural Park coordinates from RA 10067 [0] which corresponds closely in the data in OSM (red outline is the plotted coordinates) [1]. Note that this is a direct coordinate translation, I didn't bothered to convert to PRS92 as mentioned in the RA, since I don't expect very large shift from WGS84 to PRS92. Other diving websites showing coordinates of Tubbataha features (i.e. lighthouse, ranger station) also corresponds closely to the current data in OSM. Further, if you squint a little bit in the image, I loaded the MapBox satellite layer and the reef is barely visible. In short, the imagery from Bing is most likely wrong in this area. [0] https://lists.openstreetmap.org/pipermail/talk-ph/2010-December/002792.html [1] https://farm6.staticflickr.com/5570/15193057301_9d7d35fb10_o.png On Wed, Sep 10, 2014 at 11:54 AM, maning sambale emmanuel.samb...@gmail.com wrote: Not as bad as the PH one thousand bill [0], but, Tubbataha [1] seems way of from satellite imagery [2] by ~14 km. Free beer or a drink of your choice to someone who can verify with gps tracks. ;) [0] http://en.wikipedia.org/wiki/Philippine_one_thousand_peso_bill#mediaviewer/File:New_PHP1000_Banknote_%28Reverse%29.jpg [1] http://www.openstreetmap.org/way/280149159 [2] https://farm4.staticflickr.com/3843/15008702547_903ca12979_o.png -- cheers, maning -- Freedom is still the most radical idea of all -N.Branden wiki: http://esambale.wikispaces.com/ blog: http://epsg4253.wordpress.com/ -- -- 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 https://lists.openstreetmap.org/listinfo/talk-ph
Re: [talk-ph] Tubbataha is way off
Mapbox does show a faint outline however it has a small nook on the South Islet that agrees with Bing. The contributor however specified that the source of the contribution is using survey thereby making it supposedly more reliable than the imagery. It would be great if he can provide a trace.. or better yet for me to get funding to get there. Its too expensive to get there as of the moment. Any coast guards on a mission there who would like to hitch me up? :) Ervin M. *Schadow1 Expeditions* - A Filipino must not be a stranger to his own motherland. http://www.s1expeditions.com On Wed, Sep 10, 2014 at 2:38 PM, maning sambale emmanuel.samb...@gmail.com wrote: Investigating on this further, I plotted the Tubbataha Reefs Natural Park coordinates from RA 10067 [0] which corresponds closely in the data in OSM (red outline is the plotted coordinates) [1]. Note that this is a direct coordinate translation, I didn't bothered to convert to PRS92 as mentioned in the RA, since I don't expect very large shift from WGS84 to PRS92. Other diving websites showing coordinates of Tubbataha features (i.e. lighthouse, ranger station) also corresponds closely to the current data in OSM. Further, if you squint a little bit in the image, I loaded the MapBox satellite layer and the reef is barely visible. In short, the imagery from Bing is most likely wrong in this area. [0] https://lists.openstreetmap.org/pipermail/talk-ph/2010-December/002792.html [1] https://farm6.staticflickr.com/5570/15193057301_9d7d35fb10_o.png On Wed, Sep 10, 2014 at 11:54 AM, maning sambale emmanuel.samb...@gmail.com wrote: Not as bad as the PH one thousand bill [0], but, Tubbataha [1] seems way of from satellite imagery [2] by ~14 km. Free beer or a drink of your choice to someone who can verify with gps tracks. ;) [0] http://en.wikipedia.org/wiki/Philippine_one_thousand_peso_bill#mediaviewer/File:New_PHP1000_Banknote_%28Reverse%29.jpg [1] http://www.openstreetmap.org/way/280149159 [2] https://farm4.staticflickr.com/3843/15008702547_903ca12979_o.png -- cheers, maning -- Freedom is still the most radical idea of all -N.Branden wiki: http://esambale.wikispaces.com/ blog: http://epsg4253.wordpress.com/ -- -- 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 https://lists.openstreetmap.org/listinfo/talk-ph ___ talk-ph mailing list talk-ph@openstreetmap.org https://lists.openstreetmap.org/listinfo/talk-ph
[talk-ph] Tubbataha is way off
Not as bad as the PH one thousand bill [0], but, Tubbataha [1] seems way of from satellite imagery [2] by ~14 km. Free beer or a drink of your choice to someone who can verify with gps tracks. ;) [0] http://en.wikipedia.org/wiki/Philippine_one_thousand_peso_bill#mediaviewer/File:New_PHP1000_Banknote_%28Reverse%29.jpg [1] http://www.openstreetmap.org/way/280149159 [2] https://farm4.staticflickr.com/3843/15008702547_903ca12979_o.png -- 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 https://lists.openstreetmap.org/listinfo/talk-ph
