SRTM 4.1

[mdsumner]

There's a bulk download form:

https://cgiarcsi.community/data/srtm-90m-digital-elevation-database-v4-1/

Let's do it! It seems the v3 stuff is all the files in one big folder, which is causing me problems. If 4.1 is useable I reckon this is worthwhile to update

[mdsumner]

Here's my bowerbird config:

##Example file: http://srtm.csi.cgiar.org/wp-content/uploads/files/srtm_5x5/TIFF/srtm_17_03.zip
library(bowerbird)

## create all src urls by code, though less than half will be valid - will clean up later and
## derive the proper list (bb is robust to this)
srcs <- purrr::map_chr(purrr::transpose(expand.grid(x = 1:72, y = 1:24)), ~sprintf("http://srtm.csi.cgiar.org/wp-content/uploads/files/srtm_5x5/TIFF/srtm_%02i_%02i.zip", .x$x, .x$y))
srtm4.1 <- bb_source(
  name="SRTM 90m Digital Elevation Database v4.1",
  id="10.1080/13658810601169899",
  description="The SRTM digital elevation data, produced by NASA originally, is a major breakthrough in digital mapping of the world, and provides a major advance in the accessibility of high quality elevation data for large portions of the tropics and other areas of the developing world.",
  doc_url="https://cgiarcsi.community/data/srtm-90m-digital-elevation-database-v4-1/",
  citation="Jarvis, A., H.I. Reuter, A. Nelson, E. Guevara, 2008, Hole-filled SRTM for the globe Version 4, available from the CGIAR-CSI SRTM 90m Database (http://srtm.csi.cgiar.org).",
  source_url = srcs,
  license="Please cite",
  method = list("bb_handler_rget"),
  postprocess=list("bb_unzip"),
  collection_size=32,
  comment="",
  data_group="Topography")

root <- "<secrets>"

cf <- bb_config(local_file_root= root )
cf <- cf %>% bb_add(srtm4.1)
sync_status <- bb_sync(cf,  verbose = TRUE)

32 Gb is aspirational, because 72 * 36 * (0.4) * (24 + 68)Mb (uncompressed 68 Mb .tif, each download is ~24Mb), so actually ~60Gb raw disk space - we can dump the .zips and compress the tifs natively, if needed

[mdsumner]

File finder at AustralianAntarcticDivision/raadfiles@60bdf42