ndvi {gapfill} | R Documentation |
NDVI Data from Alaska
Description
The dataset was created to test gap-fill algorithms.
It mimics a subset of the MODIS NDVI data (product MOD13A1) in the region of Alaska.
The data product features one image per 16-day time interval, i.e., 24 images per year.
The indicated images (see Image(ndvi)
) were downloaded and stored as a 4 dimensional array.
Its dimensions correspond to longitude, latitude, day of the year, and year.
Usage
ndvi
Format
Numeric array with 4 dimensions. As indicated by the dimnames of the array:
dim 1: longitude,
dim 2: latitude,
dim 3: day of the year,
dim 4: year.
The values are NDVI values, and hence, between 0 and 1. Missing values are encoded as NA
.
Source
The actual MOD13A data product is available from NASA EOSDIS Land Processes DAAC, USGS Earth Resources Observation and Science (EROS) Center, Sioux Falls, South Dakota https://lpdaac.usgs.gov. MODIS data can be downloaded with the R package MODIS https://r-forge.r-project.org/projects/modis/.
Examples
str(ndvi)
Image(ndvi)