A class object for satellite image metadata

This class object organizes the attributes of satellite images' metadata from several missions/programs uniformly. Structuring the information facilitates managing, previewing, and downloading data records.

Details

records works as vector. It accepts usual R methods such as c, [], length(), subset() or unique(). Each record (vector element) contains several parameters or slots.

The object can be coerced into a data.frame by using the function as.data.frame(). The data.frame can be transformed back into a records with the function as.records().

Slots

sat

the name of the satellite.

name

the name of the file.

date

capturing date of the image.

product

name of the data product.

path

the path of the tiling system.

row

the row of the tiling system.

tileid

the tile identification number.

download

the download url.

file_path

the saving directory for the satellite record.

preview

the preview url.

api_name

the name of the API.

order

boolean, whether the image needs to be ordered.

extent_crs

coordinate reference system of the preview.

Examples

if (FALSE) {
library(rsat)
# create a copy of navarre
file.copy(from=system.file("ex/Navarre",package="rsat"),
         to=tempdir(),
         recursive = TRUE)

# load example rtoi
navarre <- read_rtoi(file.path(tempdir(),"Navarre"))

rcrds <- records(navarre)

modis.rcrds <- rcrds[sat_name(rcrds)%in%"Modis"]
ls8.rcrds <- rcrds[sat_name(rcrds)%in%"Landsat-8"]

class(modis.rcrds)
dates(ls8.rcrds)
modis.ls8.records <- c(ls8.rcrds, modis.rcrds)

print(modis.ls8.records)
}