What is Normalized Difference Vegetation Index (NDVI)?
100
The type of value for the absence of vegetation
What are negative values (in the NDVI scale)?
100
The DSI is calculated annually over this time period.
What is 2000 to 2011?
100
NDVI
What is the red to near-infrared reflectance ratio?
(NIR-RED)/(NIR+RED)
100
The journal that published Petorelli et al.'s article in 2005.
What is Trends in Ecology and Evolution
200
A categoric scale ranging from W5 to D5
What is PDSI? or What is DSI?
200
A tradeoff exists between this and spatial resolution.
What is temporal resolution?
200
The specific region for which the PDSI was devised.
What is the Great Plains region of the US? (Semi arid climate)
200
One of the most commonly used drought indices, calculated using monthly precipitation and temperature inputs along with soil moisture data
What is Palmer drought severity index (PDSI)?
200
This is one thing that can cause noise or interference in NDVI data.
(There are four.)
What are Cloud cover, water, snow, shadow
300
Data missing from a satellite image, can be caused by signal interference of sensor failure
What is drop-out?
300
Forests with different dominant trees can have similar NDVI, making this application nearly impossible (for now).
What is Plant/Tree Species Identification
300
Global reanalysis data inputs, MODIS ET algorithm, or MODIS NDVI inputs
What are uncertainties in the DSI?
300
Used to calculate net evapotranspiration
What is the Penman-Monteith equation?
300
An accuracy error caused by assigning a value to the wrong location/pixel.
What is misregistration?
400
Fits polynomial of fourier functions to NDVI time-series
What is curve-fitting?
400
Shortened to ANPP, this can be quantified from NDVI.
What is Annual Net Primary Production
400
Two things that make difficult the creation of a universal drought index.
What are the spatial and temporal complexity of drought?
400
Index estimated by the deviation from the ET/PET ratio
What is the evaporative drought index (EDI)?
400
The proportion of incoming solar radiation in the photosynthetically active region of the solar spectrum that is effectively absorbed by plants for photosynthesis
What is Fraction of Absorbed Photosynthetic Active Radiation (fAPAR)?
500
Gives the reflectance of a target as a function of illumination geometry and viewing geometry, dependent on wavelength and determined by structural and optical properties of the surface
What is Bidirectional Reflectance Distribution Function?
500
Water does this to the NDVI of a pixel, which causes problems in mixed pixels.
What is lowers NDVI?
500
How the author suggests to evaluate DSI sensitivity.
What is comparison to extensive historic climate records?
500
A series of piecewise logistic functions is one way of accomplishing this with NDVI data.
What is smoothing over time?
500
MODIS stands for this.
What is Moderate Resolution Imaging Spectroradiometer?