[Talk-us] The Greening of Georgia

Theodore Book tbook at libero.it
Wed Feb 25 19:42:54 GMT 2009


I think the issue is more that the data is somewhat out of date - I 
believe it is tagging the land use, not the presence of trees.  In some 
areas, however, especially around Atlanta, the land has been developed 
since the photography was taken on which the dataset is based.  That 
will take some correction by hand.  Georgia does have a lot of land that 
is devoted to forestry use - timber is Georgia's largest agricultural 
product.

TB

Dale Puch wrote:
> It looks like the use of landuse forest is a quite a bit more than makes 
> sense or is of use.  Yea there are lots of trees where it is shown, but 
> that includes subdivisions with a lot of trees still.
> The USGS data seems to be more the type of trees, not the "state" of the 
> trees as a forest.
> As an example, look at the map and try to show where designated national 
> forests are.
> 
> Personally I think the import is ok if the tags were adjusted more.  
> Forest should only be used if it is the primary landuse, or 
> federal/state claimed forest.
> 
> Dale
> 
> On Wed, Feb 25, 2009 at 2:42 PM, Theodore Book 
> <tbook at libero.it 
> <mailto:tbook at libero.it>> wrote:
> 
>     Dear Adam,
> 
>     Trunk roads are major roads which are not necessarily limited access.
>     Generally, they are divided roads with higher speed limits and some
>     direct access.  They would tend to fall between motorways and primary
>     roads in importance.
> 
>     TB
> 
>     Adam Schreiber wrote:
>      > Also, what's with the trunk roads?  Trunk is supposed to be
>      > hierarchically above motorway, which is what interstates are tagged
>      > with and trunk is being applied to limited access US Hwy's?
>      >
>      > Adam
>      >
>      > On Wed, Feb 25, 2009 at 8:59 AM, Theodore Book
>     <tbook at libero.it
>     <mailto:tbook at libero.it>> wrote:
>      >> Yes, It is USGS Landuse / Land Cover data.  It is 1:100k or 1:250k
>      >> resolution, and also slightly dated.  I find it to be pretty good
>      >> through zoom 14 or so, (see for example:
>      >>
>     http://www.openstreetmap.org/?lat=34.4717&lon=-84.4287&zoom=14&layers=B000FTF
>     <http://www.openstreetmap.org/?lat=34.4717&lon=-84.4287&zoom=14&layers=B000FTF>)
>      >> but there is some offset, especially around the Atlanta area,
>     that will
>      >> take some manual correction.
>      >>
>      >> Adam Schreiber wrote:
>      >>> On Tue, Feb 24, 2009 at 11:42 AM, Ian Dees
>     <ian.dees at gmail.com
>     <mailto:ian.dees at gmail.com>> wrote:
>      >>>> On Tue, Feb 24, 2009 at 10:31 AM, Adam Schreiber
>     <sadam at clemson.edu
>     <mailto:sadam at clemson.edu>> wrote:
>      >>>>> Has anyone else noticed some kind of import of park/forest
>     data for
>      >>>>> Georgia going on?  Does anyone know that source of the data?
>      >>>>>
>      >>>>>
>     http://openstreetmap.org/?lat=34.043&lon=-84.233&zoom=9&layers=B000FTF
>     <http://openstreetmap.org/?lat=34.043&lon=-84.233&zoom=9&layers=B000FTF>
>      >>>> Looks like OSM user "Liber" is uploading it.
>      >>>>
>      >>>> http://openstreetmap.org/user/Liber
>      >>>>
>      >>>> We need to be careful when uploading data like this that is
>     very low
>      >>>> resolution. As you zoom in closer, you can see that it loses
>     meaning around
>      >>>> zoom 9, which means it was probably a 1:1M or so resolution.
>     Usually my
>      >>>> cutoff is at 1:24K.
>      >>> I have sent Liber a message via the website.  Hopefully, we'll find
>      >>> out what's going on.
>      >>>
>      >>> Cheers,
>      >>>
>      >>> Adam
>      >>>
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> 
> 
> -- 
> Dale Puch
> 
> 
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