Image Classification
What is the raw digital number collected from a sensor called?
What is Digital Number (DN)?
The categorical change detection method used in the study that stacks classified images to track transitions across 3 or more dates.
What is Change Trajectory Analysis?
The vegetation index calculated to track continuous vegetation greenness and canopy density over a 30-year span.
The percentage of the 64 km² study area that experienced human-caused change.
What is 18% (or 1,111 ha)?
In this classification method, classes and training locations are defined beforehand by the user using fieldwork or image interpretation.
What is Supervised Classification?
The three broad categories into which all trajectory pathways were grouped.
What are Unchanged, Human-Induced (Irreversible), and Natural (Reversible)?
To isolate natural vegetation condition, these specific land cover types were masked out.
What are bare sand, water bodies, and land converted by humans (reservoirs and cropland)?
The primary natural environmental factor controlling vegetation condition and matching NDVI trends between 1973 and 1986.
What is precipitation (or rainfall)?
Plotting two spectral bands against each other forms a scatterplot where every pixel becomes a point, its?
What is a Feature Vector?
The five sensors used throughout the paper.
What is Landsat MSS, SPOT HRV, Landsat TM, Landsat ETM+, and the IKONOS
Of the satellite scenes collected, these three specific sensor and year combinations were selected to calculate NDVI and evaluate vegetation condition.
What is Landsat MSS (1973), SPOT HRV (1986), and Landsat ETM+ (2000)
Rather than rural population growth, these two external drivers stimulated the 40x expansion of cotton cultivation.
What are government policy and cotton market prices?