Hi Abel,
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: http://www.slideshare.net/CatherineHuybrechtsBurton/nasa-ames-develop-progra m-usda-fremont-winema-forest-carbon-management-project-2005 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. Thanks, Catherine _____________________________________________________________________ Catherine Huybrechts Burton Owner / Member, <http://www.endpointenvironmental.com/> Endpoint Environmental LLC Lead Organizer, <http://www.meetup.com/webmapsocial> WebMapSocial Meetup Group Office: (415) 668-4222 Cell: (415) 902-0403 Endpoint Environmental LLC - Changing Imagery Into Information From: [email protected] [mailto:[email protected]] On Behalf Of Abel Ludba Sent: Tuesday, July 07, 2009 2:02 PM To: [email protected] Subject: [Geowanking] Monitoring Illegal Logging Hi. 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 logged tree These could also include all kinds of: Sensors, GPS, GIS, Remote Sensing, etc. Any comment will be very welcomed. Abel. _____ Reclaim your name @ymail.com or @rocketmail.com. Get your new email address now <http://ca.promos.yahoo.com/jacko/> !
_______________________________________________ Geowanking mailing list [email protected] http://geowanking.org/mailman/listinfo/geowanking_geowanking.org
