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# Quick script to determine whether the filename of each downloaded
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# ASTER tile is faithful to its spatial location as specified in the
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# GeoTIFF itself.
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#
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# This script is written to run on eos, based on the file system
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# location of downloaded ASTER tiles as of 04-Aug-2011
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#
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# Jim Regetz
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# NCEAS
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# Created on 04-Aug-2011
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library(rgdal)
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# for a given file, return TRUE if file name matches the internally
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# specified lower left corner, otherwise return string with those
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# coordinates
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check <- function(tilename, path=".", silent=TRUE) {
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# build expected filename
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origin <- round(GDALinfo(path.expand(file.path(path, tilename)),
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silent=silent)[c("ll.x", "ll.y")])
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ly <- origin["ll.y"]
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y <- sprintf("%s%02d", if (ly>=0) "N" else "S", abs(ly))
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lx <- origin["ll.x"]
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x <- sprintf("%s%03d", if (lx>=0) "E" else "W", abs(lx))
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expected.name <- paste("ASTGTM_", y, x, "_dem.tif", sep="")
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# compare to actual filename
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if (tilename==expected.name) {
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TRUE
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} else {
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paste(y, x)
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}
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}
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# produce vector of check results, with the actual file names as vector
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# element names (takes ~12 minutes on eos)
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aster.dir <- "~organisms/DEM/asterGdem"
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aster.tiles <- list.files(aster.dir, pattern="^ASTGTM.*_dem.tif$")
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tilecheck <- sapply(aster.tiles, check, path=aster.dir)
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# report mismatches
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data.frame(expected=tilecheck[tilecheck!="TRUE"])
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## expected
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##ASTGTM_N59E069_dem.tif N63 E109
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##ASTGTM_N63E113_dem.tif N69 E107
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##ASTGTM_N63E117_dem.tif N69 E113
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##ASTGTM_N64E098_dem.tif N70 E117
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##ASTGTM_N65E104_dem.tif N73 E084
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##ASTGTM_N65E111_dem.tif N73 E098
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##ASTGTM_N65E117_dem.tif N66 E130
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