[Talk-in] national parks

[PlaneMad]

On Fri, Apr 2, 2010 at 10:35 AM, Kenneth Gonsalves <lawgon at au-kbc.org>wrote:

> On Thursday 01 Apr 2010 7:32:37 pm PlaneMad wrote:
> > On Thu, Apr 1, 2010 at 5:45 PM, Kenneth Gonsalves <lawgon at au-kbc.org>
> wrote:
> > > landsat is cool - am now able to map the lakes in the Nilgiris with
> > > reasonable
> > > accuracy
> > > --
> >
> > dont forget the lakewalker plugin. one click tracing of water bodies from
> > landsat tiles.
> >
>
> how accurate is landsat? If you look at this link:
> http://www.openstreetmap.org/?lat=11.327&lon=76.6144&zoom=14&layers=B000FTF
>
> the lakes are traced from landsat and you find the road going through the
> lake
> at points. The road is done from gps tracks and is accurate to a meter. And
> even at the closest points to the lake, it is at least 20 meters from the
> lake
> edge even if the lake is full.
> --
> regards
> Kenneth Gonsalves
> Senior Associate
> NRC-FOSS
> http://certificate.nrcfoss.au-kbc.org.in
>
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>

I had compared landsat lakes in chennai and found the offset error to be
around ~20m max. But in this case it looks like its around 100m. Given the
low resolution, seems understandable.

-- 
http://j.mp/ArunGanesh
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