[GIS] Downloading bathymetric data for free

bathymetrydatadownload

I always wondered where cartographers get their bathymetric data from to create maps like the Zanzibar map on wikipedia for instance. I could download polygons for the 1000 meter polygons on naturalearthdata.com but I want to show maximum 100 meter levels or lower. Thus the question: What ist the easiest, user-friendliest way? Like naturalearthdata, but in 100s…

There was a similar question asked in this forum, I tried the named sources, but I couldn't figure out where exactly to download and how to transform the format. Therefore I need a better description on HOW to download the data and convert it to an appropriate GIS format.

I work with ArcMap 10.4 or QGIS 2.16. A SRTM raster tile (geotiff) would be fine (like for the land areas) or Polygon/Line Featureclasses/Shapefiles.

Best Answer

You can use SRTM30 PLUS which include topography and bathymetry of roughly 1km spatial resolution. The data covers the entire globe. You can choose the location you want. Also, the above link has multiple versions, please check the one you need, and there is an FTP link to download the data.

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SRTM Data – How to Download SRTM Data

Update: I think wget would be better, i just don't use it very often:

wget -r -A.zip http://dds.cr.usgs.gov/srtm/version2_1/SRTM3/

Also see for some retrieval wait options (if you want to be courteous): https://superuser.com/questions/178297/wget-terminates-unexpectedly/178326#178326

You could curl the files with a little bit of text editor work.

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For curl, the man page is here: http://curl.haxx.se/docs/manpage.html

Download here: http://curl.haxx.se/download.html

I think there are throttling and retry options (check the above-mentioned man page).

curl -O http://dds.cr.usgs.gov/srtm/version2_1/SRTM3/Australia/S11E119.hgt.zip
curl -O http://dds.cr.usgs.gov/srtm/version2_1/SRTM3/Australia/S11E120.hgt.zip
curl -O http://dds.cr.usgs.gov/srtm/version2_1/SRTM3/Australia/S11E121.hgt.zip
curl -O http://dds.cr.usgs.gov/srtm/version2_1/SRTM3/Australia/S11E122.hgt.zip
curl -O http://dds.cr.usgs.gov/srtm/version2_1/SRTM3/Australia/S11E123.hgt.zip

In addition to Jay's excellent pointers, I would recommend using the --timestamping flag when downloading so you can only get files that are newer than on your file system (really useful when your downloading gets interrupted).

Additionally, using the --no-parent flag means that only the SRTM3 directory is downloaded rather than it continuing up the tree to the other directories.

The full wget commandline I'm using:

wget -r --no-parent --random-wait --timestamping -A.zip http://dds.cr.usgs.gov/srtm/version2_1/SRTM3/

[GIS] find free Bathymetric data for Indian Ocean

http://www.naturalearthdata.com/downloads/ has 1:50M rasters of the Ocean Bottom (http://www.naturalearthdata.com/downloads/50m-raster-data/). All their data is public domain so there are no worries about licenses.

Best Answer

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SRTM Data – How to Download SRTM Data

[GIS] find free Bathymetric data for Indian Ocean

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