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Analyzing Advantages of ECOSTRESS as a Tool for Drought
Detec<on and Water Management Prac<ces
NASADEVELOPNa,onalProgram
Background
• ProjectPartner:EARTHUniversity• 2013DroughtinCostaRica• 2015ElNiño
Overview of methods
• HowwillECOSTRESSimprovethecurrentmethodsusedfortheanalysisofvegeta,vestress?
• TWOsourcesofimagery:LandsatandMODIS
• TWOmethodsofdetec,on:NDVIandEvapotranspira5on
Temporal Results
0.4
0.5
0.6
0.7
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
ND
VI
0.4
0.5
0.6
0.7
0.8
0.9
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
ND
VI
75
125
175
225
275
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
Evap
otra
nspi
ratio
n
(W m
-2)
Trend(3-dayaverage)
Trend(seasonallycorrected)
Droughtyears:2013-2015
Landsat
MODIS MODIS
Evap
otra
nspi
ratio
n
Landsat Evapotranspiration Data to Come!
Daily Aggrega<on of ET, NDVI, LST: 2003-2015 for MODIS
25
26
27
28
29
30
31
170
180
190
200
210
220
230
240
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Dec
LST(ºC
)
Evapotranspira,o
n(W
m-2)
Evapotranspira,on LST
0.58
0.63
0.68
0.73
0.78
170
180
190
200
210
220
230
240
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Dec
NDV
I
Evapotranspira,o
n(W
m-2)
Evapotranspira,on NDVI
WetSeason WetSeason
Spa<al Results: Landsat vs. MODIS
-0.5 0 0.5
Landsat MODIS
MODISLandsat
Landsat MODIS
NDVI2013
2014
2015
Evapotranspira5on
Landsat MODIS
Janu
ary22
,200
4
Conclusions so far…
• ETderivedfromthePT-JPLmodeldirectlymirrorstheseasonalpa]ernsofCostaRica
• NDVIexhibitsa2monthlag,andmissesthedryperiodfromJuly-Augusten,rely
• MODISallowsustotrackvegeta,onstressinnear-real,me,butusingLandsatallowsustotrackexactlywherevegeta,onstressisoccurringatthefarmscale
• MOREresultstocome!
Acknowledgements
• ThankstothewholeECOSTRESSScienceTeamforcrea,ngaproductwedesperatelyneed!
• ThankstoGregHalversonforPT-JPLMODIS&Landsatpipeline.
• SpecialthankstoDr.JoshFisherandDr.Chris,neLeefortheirguidanceandsupportthroughouttheproject.
