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| Subject: | Re: RE: [gislist] GPS for capturing street centerline data |
| Date: |
11/16/2003 08:45:01 PM |
| From: |
<imageryx .. cox.net> |
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Isn't the geo accuracy of Ikonos imagery about 3-5 meters? If you have to do a lot of streets, it may be more cost effective to do it with satellite imagery that is processed to the approriaye level of geolocation accuracy. And, there may be other information you can derive from the imagery once you have it, such as distances between other features and their condtions.
David
>
> From: "Dimitri Rotow" <dar@manifold.net>
> Date: 2003/11/14 Fri PM 01:06:18 EST
> To: "Sonny Parafina" <sonny@ionicenterprise.com>,
> "Ted Cisine" <ted.cisine@co.robeson.nc.us>,
> <raghavendran@pixelinfotek.com>
> CC: "GIS List (GeoComm)" <gislist@lists.thinkburst.com>
> Subject: RE: [gislist] GPS for capturing street centerline data
>
>
> >
> > There is an interesting section on street centerline capture
> > methods in this
> > report (see link below) on linear referencing systems. See the section on
> > creating centerline databases, the study claims that $250 GPS can create a
> > centerline with sufficient accuracy for most applications.
> >
> > http://www.ncgia.ucsb.edu/vital/research/pubs/200204-LRsynthesis.pdf
> >
> >
>
> Absolutely! Especially in the US where with WAAS-enabled GPS (still under
> $250) you can get 2 meter accuracy or better.
>
> This goes for many other applications as well. The above report correctly
> notes that now that Selective Availability distortion has been turned off
> GPS makes sense in many applications where formerly it did not. For many
> types of mapping you can't beat the convenience of plugging a WAAS-enabled
> GPS into your laptop and then simply driving, say, the boundaries of your
> ranch, the roads in your forest tract, trails, the perimeter of a lake, etc.
> and bang! like magic you get really good maps with nearly no manual effort.
> Canopy interference is sometimes an issue in dense forest but I here there
> are GPS devices that can deal with that.
>
> We have people driving a GIS/laptop/GIS rig in just about every sort of
> vehicle imagineable: jeeps, ATVs, mountain bikes, canoes, etc.
>
> Cheers,
>
> Dimitri
>
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