Deducing forest cover from high alt photos? Tips?

[Ron Huber]

Friends

 I am having a tough time finding data on  forest cover change over time in the coastal forests of Penobscot Bay and lower Penobscot River. 

I have high quality high altitude aerials of these forests from different times back at least to 1940  Is there a system for deducing the forest cover change  percentage through comparing these photos?

Ron

[Jeffrey Warren]

Hi, Ron - I'm copying in the grassrootsmapping list -- i'm sure there are some forest-focused folks there who can help out!

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[Randy Sargent]

If change since 2000 is helpful by itself, look here.  That was automatically generated from Landsat 7 using Earth Engine, and makes use of Landsat's infrared bands as well as red and green bands.

But Landsat 7 is very coarse resolution -- 15 meters per pixel, bigger than your average tree.  I'm sure it must be possible to classify forest with RGB or even greyscale images if the resolution is sufficient to see the texture of the treetops.  (But I haven't bumped into people doing that.)

-- Randy

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[Randy Sargent]

Hi Ron,

If change since 2000 is helpful by itself, try Global Forest Change.  That was automatically generated from Landsat 7 using Earth Engine, and makes use of Landsat's infrared bands as well as red and green bands.

But Landsat 7 is very coarse resolution -- 15 meters per pixel, bigger than your average tree.  I'm sure it must be possible to classify forest with RGB or even greyscale images if the resolution is sufficient to see the texture of the treetops.  (But I haven't personally done that or seen examples, sorry).

-- Randy

On Mon, Jun 15, 2015 at 5:49 PM, Jeffrey Warren <je...@publiclab.org> wrote:

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