Showing posts with label statistics. Show all posts
Showing posts with label statistics. Show all posts

Tuesday, March 20, 2012

Clockwork Universe - Certainty, Repeatability,Chaos and GSoC

Whenever someone says that something is random, I always ask - sampling which distribution ? This is faced with stares of ridicule because people always come to hasty generalisations about the randomness of inidividual events without studying the whole system. The above statement is a generalisation on my part and I should spend more time socialising, rather than blog writing.

In nature every individual is random/unique, yet patterns repeat since all the individuals are part of the same distribution. After the development of Newtonian/classical mechanics clockwork universe ideas were rampant, till Poincare pointed out that we cannot actually predict how the clock functions, since our knowledge of the fundamental parameters forming its machinery, namely e and π is uncertain, as is the knowledge of the exact position of the hands of the said clock.


Small uncertainities in the knowledge of initial conditions also rapidly devolve into large uncertainities in the knowledge of the evolved condition, while staying in scope of a larger pattern. All this musing was brought about while watching Hugo.


Some systems are however easier to predict in a short term. It is time again for the annual Google Summer of Code. I have signed up with Osgeo to be a mentor, mostly for Ossim and Opticks. If some other Image processing or raster serving based project pops up I will see how I can fit it in. Till then it remains to be seen whether last year's wonderful GSoC experience repeats itself this leap year (and supposedly the universe ending year too).

Friday, June 18, 2010

Chicken and Egg - SAR Data and Field work Data

In SAR Remote Sensing you often end up with rather chicken and egg scenarios. There is the empirical application oriented school which focuses on producing parameters like biomass and soil moisture from SAR backscatter, the other school is the electromagnetic simulation school which focuses on producing estimates of SAR backscatter from parameters gathered from fieldwork. My PhD aims to reconcile these 2 schools for dual-polarimetric SAR systems in L and X band. For all practical purposes this has become ALOS-PALSAR and TerraSAR-X data analysis. Though there is some chance of using the ProSensing PLIS system in L-band.

Forest study for biomass estimation and Soil moisture at L-band is well established due to the ERS sensors - Preliminary analysis of ERS-1 SAR for forest ecosystem studies. The same applies to C-band thanks to ENVISAT, RadarSAT etc. The use of X-band for these scenarios is relatively new and I am hoping to break new ground.

The PLIS system is currently producing bright curves from corner reflectors that everybody seems to be very excited about. Other things I am not excited about is the $1000 phone bill from few hours of internet browsing in Singapore. It looks ridiculous, 2 minutes costs some $100. I could have so easily used the freewifi from - wireless@SG. Also feasible is getting a cheap local sim, things to remember before I plug my modem in.