Summarize NDVI data to monthly or lunar monthly level
ndvi(
level = "monthly",
sensor = "landsat",
fill = FALSE,
path = get_default_data_path(),
download_if_missing = TRUE
)
specify "monthly" or "newmoon"
specify "landsat", "modis", "gimms", or "all"
specify if missing data should be filled, passed to
fill_missing_ndvi
either the file path that contains the PortalData folder or "repo", which then pulls data from the PortalData GitHub repository
if the specified file path doesn't have the PortalData folder, then download it