[Geowanking] Monitoring Illegal Logging
catherine at endpointenvironmental.com
Tue Jul 7 15:15:48 PDT 2009
In my experience it is very difficult to count individual trees on any kind
of large scale project. There are two remotely sensed image processing
products which may be useful that I can think of off of the top of my head:
LiDAR and standard multi-spectral low-resolution imagery. Allow me to offer
a highly simplified explanation (mostly because I would need to dust off the
details in my head):
- LiDAR is a data-cloud of points that can penetrate tree canopy.
LiDAR data allows an analyst identify individual trees; it is the only
remotely sensed data that can penetrate tree canopy. It is very, very
expensive to collect large swaths of LiDAR data. Some states and /or
municipalities collect it for various reasons and sometimes you can get your
hands on it if you are very nice. ;).
- Standard multi-spectral low-resolution imagery like LANDSAT can
be classified using remote sensing image processing techniques to show
forested versus non-forested or logged areas. By doing a little ground
"truthing" and going out into a wooded area featured in a given LANDSAT
image, then counting how many trees are within a given area on the ground,
an analyst can extrapolate that data to his or her classification system. A
little aggregating later and viola, you are able to estimate how many trees
went missing after a logging event takes place. LANDSAT data is really
pretty good for picking up logged vs. non-logged areas and is free.
In 2004 -2005, I worked on a project with NASA Ames DEVELOP Program to map
carbon sequestration after logging in a forest in Oregon. I've posted our
poster up on slideshare and you can check it out if you like:
These are only a couple image processing techniques for identifying logging
on a large scale. I'm happy to point you in the direction of more
information on the subject if you are interested.
Catherine Huybrechts Burton
Owner / Member, <http://www.endpointenvironmental.com/> Endpoint
Lead Organizer, <http://www.meetup.com/webmapsocial> WebMapSocial Meetup
Office: (415) 668-4222
Cell: (415) 902-0403
Endpoint Environmental LLC - Changing Imagery Into Information
From: geowanking-bounces at geowanking.org
[mailto:geowanking-bounces at geowanking.org] On Behalf Of Abel Ludba
Sent: Tuesday, July 07, 2009 2:02 PM
To: Geowanking at geowanking.org
Subject: [Geowanking] Monitoring Illegal Logging
I am trying to get an overview of existing tools/technics to map and/or
handle Illegal Logging. We are trying to detect (if possible) every signle
These could also include all kinds of: Sensors, GPS, GIS, Remote Sensing,
Any comment will be very welcomed.
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now <http://ca.promos.yahoo.com/jacko/> !
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