Re: [Talk-us] NOAA Composite Shoreline
On Wed, Jul 13, 2011 at 3:58 PM, Nathan Edgars II nerou...@gmail.comwrote: Is it better than the NHD shoreline? Not sure, I plan to compare NHD, NGA PGS, NOAA, and any other sources I can find. I've asked USGS and Virginia what the best sources are. On Wed, Jul 13, 2011 at 6:53 PM, Serge Wroclawski emac...@gmail.com wrote: On Wed, Jul 13, 2011 at 2:47 PM, Josh Doe j...@joshdoe.com wrote: Has anyone looked at the NOAA Composite Shoreline? It seems to have much better accuracy (as in orders of magnitude better) than the PGS shoreline that was imported, at least for the small portion I checked in Virginia. How are you determining that? By inspection against Bing and 2009 aerial imagery. PGS didn't even include several large creeks, and the positional accuracy was very rough. If you just look at Virginia's coast, it's quite clear. If I had to guess, PGS (or rather what's in OSM now) is around 25m accuracy, whereas the NOAA data is more like 5m. Of course this varies from area to area, and the recency is also in question, but at least for Virginia's coast anything is better than PGS. -Josh ___ Talk-us mailing list Talk-us@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-us
Re: [Talk-us] NOAA Composite Shoreline
On Wed, Jul 13, 2011 at 4:07 PM, TC Haddad tchad...@gmail.com wrote: As with everything, proceed with caution. The metadata for that layer states: These data were automated to provide a suitable geographic information system (GIS) data layer depicting the historical shoreline for the United States. These data are derived from shoreline data that were produced by the NOAA National Ocean Service including its predecessor agencies Checking it against other shorelines in my area (Oregon coast) shows that most of the river mouths are depicted in this layer before they had jetties, and areas of high erosion/accretion are substantially different. Also in one location (-124.286565 42.042545) it is showing an ocean pier that absolutely does not exist today. One nice thing is that it has a field called SURVEYDATE that reports that that particular part of the composite shoreline dates from 01/01/1928 so I'd pay attention to that field if you're wondering about if the data is worth the effort for your area... Certainly, it must be compared for each region against what's in OSM, other shoreline data, aerial imagery, survey, etc. I'm thinking the state or even the individual counties might have the best, most accurate and up-to-date data, so I'm checking with them. -Josh ___ Talk-us mailing list Talk-us@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-us
Re: [Talk-us] NOAA Composite Shoreline
On Wed, Jul 13, 2011 at 4:38 PM, Adam Schreiber sa...@clemson.edu wrote: Josh, As the person that imported the NHD shoreline for most of the southern east coast, I can tell you that I mainly tried to fix directional errors and obvious missing features. Correcting to imagery was beyond the scope of the effort as that was back when we were just trying to get something workable in and not throw errors on the coastline checker. Certainly it's quite a bit of work to trace imagery, something I'll only do for some small areas that I have interest in. However if I can significantly improve the quality of Virginia's coast through merging NOAA/NGA/USGS/Virginia/county data without much difficulty, I think it's a valuable effort. Too bad the coastline error checker has been dead for over a year. -Josh ___ Talk-us mailing list Talk-us@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-us
[Talk-us] NOAA Composite Shoreline
Has anyone looked at the NOAA Composite Shoreline? It seems to have much better accuracy (as in orders of magnitude better) than the PGS shoreline that was imported, at least for the small portion I checked in Virginia. Unless there are better sources, I'll probably use this to fixup Virginia's coast piece by piece in JOSM at some point. -Josh ___ Talk-us mailing list Talk-us@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-us
Re: [Talk-us] NOAA Composite Shoreline
On Wed, Jul 13, 2011 at 11:47 AM, Josh Doe j...@joshdoe.com wrote: Has anyone looked at the NOAA Composite Shoreline? It seems to have much better accuracy (as in orders of magnitude better) than the PGS shoreline that was imported, at least for the small portion I checked in Virginia. Unless there are better sources, I'll probably use this to fixup Virginia's coast piece by piece in JOSM at some point. Can you point me to the NOAA Composite Shoreline? thanks, Clifford ___ Talk-us mailing list Talk-us@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-us
Re: [Talk-us] NOAA Composite Shoreline
On Wed, Jul 13, 2011 at 3:01 PM, Clifford Snow cliff...@snowandsnow.uswrote: On Wed, Jul 13, 2011 at 11:47 AM, Josh Doe j...@joshdoe.com wrote: Has anyone looked at the NOAA Composite Shoreline? It seems to have much better accuracy (as in orders of magnitude better) than the PGS shoreline that was imported, at least for the small portion I checked in Virginia. Unless there are better sources, I'll probably use this to fixup Virginia's coast piece by piece in JOSM at some point. Can you point me to the NOAA Composite Shoreline? Oops, forgot a link: http://shoreline.noaa.gov/data/datasheets/composite.html It's available as a single 200MB shapefile: http://shoreline.noaa.gov/data/datasheets/noaa_composite.zip All the other federal government shoreline datasets are listed here: http://shoreline.noaa.gov/index.html -Josh ___ Talk-us mailing list Talk-us@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-us
Re: [Talk-us] NOAA Composite Shoreline
On 7/13/2011 2:47 PM, Josh Doe wrote: Has anyone looked at the NOAA Composite Shoreline? It seems to have much better accuracy (as in orders of magnitude better) than the PGS shoreline that was imported, at least for the small portion I checked in Virginia. Unless there are better sources, I'll probably use this to fixup Virginia's coast piece by piece in JOSM at some point. Is it better than the NHD shoreline? ___ Talk-us mailing list Talk-us@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-us
Re: [Talk-us] NOAA Composite Shoreline
As with everything, proceed with caution. The metadata for that layer states: These data were automated to provide a suitable geographic information system (GIS) data layer depicting the historical shoreline for the United States. These data are derived from shoreline data that were produced by the NOAA National Ocean Service including its predecessor agencies Checking it against other shorelines in my area (Oregon coast) shows that most of the river mouths are depicted in this layer before they had jetties, and areas of high erosion/accretion are substantially different. Also in one location (-124.286565 42.042545) it is showing an ocean pier that absolutely does not exist today. One nice thing is that it has a field called SURVEYDATE that reports that that particular part of the composite shoreline dates from 01/01/1928 so I'd pay attention to that field if you're wondering about if the data is worth the effort for your area... Tanya On Wed, Jul 13, 2011 at 12:07 PM, Josh Doe j...@joshdoe.com wrote: On Wed, Jul 13, 2011 at 3:01 PM, Clifford Snow cliff...@snowandsnow.us wrote: On Wed, Jul 13, 2011 at 11:47 AM, Josh Doe j...@joshdoe.com wrote: Has anyone looked at the NOAA Composite Shoreline? It seems to have much better accuracy (as in orders of magnitude better) than the PGS shoreline that was imported, at least for the small portion I checked in Virginia. Unless there are better sources, I'll probably use this to fixup Virginia's coast piece by piece in JOSM at some point. Can you point me to the NOAA Composite Shoreline? Oops, forgot a link: http://shoreline.noaa.gov/data/datasheets/composite.html It's available as a single 200MB shapefile: http://shoreline.noaa.gov/data/datasheets/noaa_composite.zip All the other federal government shoreline datasets are listed here: http://shoreline.noaa.gov/index.html -Josh ___ Talk-us mailing list Talk-us@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-us ___ Talk-us mailing list Talk-us@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-us
Re: [Talk-us] NOAA Composite Shoreline
Josh, As the person that imported the NHD shoreline for most of the southern east coast, I can tell you that I mainly tried to fix directional errors and obvious missing features. Correcting to imagery was beyond the scope of the effort as that was back when we were just trying to get something workable in and not throw errors on the coastline checker. Cheers, Adam On Wed, Jul 13, 2011 at 2:47 PM, Josh Doe j...@joshdoe.com wrote: Has anyone looked at the NOAA Composite Shoreline? It seems to have much better accuracy (as in orders of magnitude better) than the PGS shoreline that was imported, at least for the small portion I checked in Virginia. Unless there are better sources, I'll probably use this to fixup Virginia's coast piece by piece in JOSM at some point. -Josh ___ Talk-us mailing list Talk-us@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-us ___ Talk-us mailing list Talk-us@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-us
Re: [Talk-us] NOAA Composite Shoreline
On Wed, Jul 13, 2011 at 2:47 PM, Josh Doe j...@joshdoe.com wrote: Has anyone looked at the NOAA Composite Shoreline? It seems to have much better accuracy (as in orders of magnitude better) than the PGS shoreline that was imported, at least for the small portion I checked in Virginia. How are you determining that? - Serge ___ Talk-us mailing list Talk-us@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-us
