Tuesday, February 25, 2014

Longitudinal variation with latitude (R script)


lat  = 0
long_dd_km <- 6378.145 * 2 * atan2(sqrt(cos(lat * pi/180)^2 * 7.615242e-05), sqrt(1 - cos(lat * pi/180)^2 * 7.615242e-05))




Thursday, December 12, 2013

FINAL Report from our work modeling future scenarios of land cover, forest composition and structure, and ecosystem services released! See: http://harvardforest.fas.harvard.edu/news/new-study-reveals-promise-and-peril-land-use-decisions

Monday, November 11, 2013

INOGO reference library completed


More than 400 hours of work over a year by a small team. A new excellent resource for documents of the Osa and Golfito region. Please contact me if you would like access to any of these documents while we work out the online downloading approach (eventually via inogo.stanford.edu).


ArcGIS maps featured



Sunday, June 26, 2011


After a few challenging - but productive - years, the LiCOR has returned to its home at Carnegie. Long live the LiCOR!

Saturday, June 18, 2011


With the excellent help of Cam and Rikke we brought the two top of canopy climate towers down and calculated the final wind direction azimuths.


Carrying one of our two 15 foot tower poles out of the forest.


Rigging up for the removal of the high elevation tower.



And a final celebratory climb of a 180 ft. giant redwood. What a view of Laupahoehoe!


Friday, May 27, 2011

My day has felt like the Matrix movie…

Working to create a 3D leaf area density map of my study area… Challenging!


Tuesday, May 10, 2011

Friday, April 22, 2011

Friday, April 1, 2011


going up!


Excuse the delay in updates, been overwhelmed with field work, job related activities, remote sensing analysis and modeling for our Amazon project. All is moving well, here is the tally for the Hawaii project:

Canopy LiCOR days left: 3-4.

Understory LiCOR days left: 3-6.

Interior Forest Microclimate Sites left: 3-4.

Biodiversity leaf area density transects: 2-3 days.

Almost there! Wonderful, especially with the intense rains we’ve been having these last weeks.

Here are some nice panoramic photos from recent field work:


Thursday, March 3, 2011


Finished tree 4 of 20; a few weeks to go.


Received a new PAR sensor (w/ 28 m cable) to replace one that shorted out in the interior forest micro-climate array. This will also be a good opportunity to test the calibration of the other 3 interior forest sensors.


Heading to the field today to take down interior forest sensors, download top of canopy low and high elevation tower data, replace desiccant, and then perform the PAR calibration back here at the house.

Monday, February 28, 2011


Nice ArcMAP extension allowing for simultaneous comparison of points in Arc and Google Earth. Can be downloaded….search for something like: Arc2Google ArcMAP extension.

Saturday, February 26, 2011


Excellent! Making rapid progress on road mapping and validation!! Angelica has done amazing with the Quickbird imagery. Here is a small low resolution subset of our study area.

Wednesday, February 23, 2011


Finally, the finished river/water mask for a small subset (low res version) around Puerto Maldonado (Peruvian Amazon) in our study area!

Friday, February 18, 2011



3 sites down, 17 to go!

Thursday, February 17, 2011


Calibration and installation of our sensors. Unfortunately one of our PAR sensors shorted out, will have to send it back to Apogee and have it replaced when we take them down next week.

Wednesday, February 9, 2011


Soil gas efflux sampling for Kye (Stanford Post-doc) project linking remote sensing with soil C02 emissions. These samples will be analyzed on a GC (Gas Chromatograph) back at Stanford in the upcoming month.



4 7 ml samples every 20 minutes for 4 cycles.

Monday, February 7, 2011


car full of gear for canopy licoring.


angelica and I heading out for the first load.


stacks of gear, including our climbing equipment and safety gear and hanging chair for long canopy sessions.


Ready to go!


Stack of climbing and LiCORing gear ready to go.


Angelica and Kai leading up georeferencing operations on the ground.


Collecting our 4th curve set!