[Imports] Polish Forests - Imports

Paul Norman penorman at mac.com
Wed Oct 30 23:44:35 UTC 2013


> From: Glen Barnes [mailto:barnaclebarnes at me.com]
> Sent: Wednesday, October 30, 2013 4:00 PM
> Subject: Re: [Imports] Polish Forests - Imports
> 
> 
> On 31/10/2013, at 11:32 am, Paul Norman <penorman at mac.com> wrote:
> 
> >
> > - There are several areas which are not forests
> 
> I would be careful about making that statement. They may not look like
> forests in the satellite imagery but how old is the sat photo? Have they
> recently been planted? Maybe they have been clear felled at the time of
> satellite taking and have now been planted or conversely they were
> forests at the time the dataset was made but have now been cut.
> 
> Forests undergo quite regular change in their shape and size given their
> life of 10+ years and staggered planting (depending on the species).

The Bing imagery is 2011 and some of the clearings have buildings in them.

If it was a difference in time between the imagery and the data, I would 
expect to see about as many voids in the data without voids in the imagery 
as voids in the imagery without voids in the data, but it's all holes in 
the forest visible on Bing, but not in the data.




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