Title :
Atmospheric correction of a seasonal time series of Hyperion EO-1 images and red edge inflection point calculation
Author :
Vesanto, Veli-Heikki ; Mottus, Matti ; Heiskanen, Janne ; Rautiainen, Miina ; Majasalmi, Titta
Author_Institution :
Dept. of Forest Sci., Univ. of Helsinki, Helsinki, Finland
Abstract :
This study covers the preprocessing and atmospheric correction of a seasonal time series five Hyperion EO-1 images from Hyytiälä, Southern Finland (61° 51´N, 24° 17´E). The time series ranges from May 5th 2010 to July 11th 2010, covering much of the growing season and the seasonal changes in vegetation reflectance. Atmospheric correction of the time series was done with Fast Line-of-sight Atmospheric Analysis of Spectral Hypercubes (FLAASH) and ATmospheric CORrection (ATCOR) algorithms for comparison. Both algorithms performed well with Hyperion imagery. Different red edge inflection point (REIP) calculation methods were analyzed to determine their applicability for Hyperion imagery. REIP was calculated using four-point interpolation, Lagrangian interpolation, and fifth order polynomial fitting. Due to the dynamics of the red edge, polynomial fitting was seen as the best method for calculating the REIP. REIP did not correlate strongly with Leaf Area Index (LAI) but a stronger correlation was observed with understory REIP.
Keywords :
geophysical image processing; interpolation; time series; vegetation mapping; ATCOR; FLAASH; HyyWila; LAI; Lagrangian interpolation; REIP; Southern Finland; atmospheric correction; atmospheric correction algorithms; fast line-of-sight atmospheric analysis of spectral hypercubes; fifth order polynomial fitting; four-point interpolation; leaf area index; red edge inflection point calculation; seasonal time series five Hyperion EO-l images; vegetation reflectance; Abstracts; Biomedical imaging; Clouds; Image edge detection; Market research; Noise; Remote sensing; Hyperion; atmospheric correction; red edge inflection point; seasonal reflectance change; time series;
Conference_Titel :
Hyperspectral Image and Signal Processing: Evolution in Remote Sensing (WHISPERS), 2012 4th Workshop on
Conference_Location :
Shanghai
Print_ISBN :
978-1-4799-3405-8
DOI :
10.1109/WHISPERS.2012.6874307