Is there a way to automatically download all the tiles in GMTED2010 data?
From:
https://topotools.cr.usgs.gov/GMTED_viewer/viewer.htm
I can only seem to be able to download by double-clicking tile by tile.
[GIS] How to quickly download all GMTED2010 data
dataelevation
Related Solutions
My suggestions would be to utilize reverb at http://reverb.echo.nasa.gov/reverb/. First register if you have not already done so. In the search box type ASTER GDEM and Select Dataset --- note if you want a particular area this is the point where you select the box range in the map window to the left (very useful feature!).
ASTER GDEM Global Digital Elevation Model V002
Select "Search for Granules"
Now begins the tedious part where there are over 22,000 ASTER GDEM tiles that cover the globe however, the website only list 400 per page where there is an 'Add All on Page' button but no Add All option (i.e. 50 + pages to go through + load time).
Press the View Items in Cart (Shopping Cart), press the 'ALL' button that will pop up a new message 'All Items on Page Selected. Select All n Items in Cart'. Click on that link. At the bottom of the page select 'Order Selected' (no direct download is available).
Follow the appropriate steps including your order details (its free no worries) and on the following page select the 'Order Option - Not Set and Required' button to state the reason for the download (remember to use the apply to all function).
You will then receive an email entitled CM SHARED with directions for ftp pull on your selected data. From my limited experience, this usually takes approximatley one working day. Essentially the ftp and pull directory to connect will look like:
ftp://e4ftl01.cr.usgs.gov # Ftp Server
PullDir/0302595257dmDDFH # Pull Directory Example
This provides really fast download (unlike some other ftp sites Global Land Cover Facility) especially comming from Europe (5mb/s).
Sorry for the long answer to a rather simple procedure but as I write this I am actually downloading ASTER GDEMv2 data myself for the entire continous USA. Note ASTER GDEMv2 is not void filled (although improvements have been made), unlike others like SRTM V4.1 from http://srtm.csi.cgiar.org/ at 90m resolution.
Briefly, USGS has application services (Option #1), but for some data sets it's also possible to generate direct download URLs (Option #2) to the public location of files.
Download Option #1: USGS Application Services
There's documentation here about the web services that are available: http://nimbex.cr.usgs.gov/app_services.php
If you're interested in elevation data, be aware of this:
As of July 1, 2013, National Elevation Dataset (NED) 1- and 1/3-arc-second data are distributed only through pre-packaged 1x1 degree tiles in ArcGrid, GridFloat and IMG formats. Because of their very large file sizes, NED 1/9 arc-second data is distributed only through pre-packaged 15x15 minute tiles in IMG format.
I believe the changes (no more seamless) to the web services over the past couple years are related to this.
This is legit way to download data programmatically. But if you only need some simple tiles...
Download Option #2: Tiles via easy to generate URLs
The National Map Viewer can be used for downloading all kinds of data, but of course that is not programmatic. But if you make an "order" from the National Map Viewer, you will notice that the download links it sends you are very simple to generate.
For example, let's look at Elevation data since it's one of the more complicated ones to figure out. The links in the email look like this:
http://gisdata.usgs.gov/TDDS/DownloadFile.php?TYPE=ned1g_zip&FNAME=n36w100.zip&ORIG=TNM&dlpre=1-9
http://gisdata.usgs.gov/TDDS/DownloadFile.php?TYPE=ned1g_zip&FNAME=n36w101.zip&ORIG=TNM&dlpre=2-9
http://gisdata.usgs.gov/TDDS/DownloadFile.php?TYPE=ned3g_zip&FNAME=n41w074.zip&ORIG=TNM&dlpre=1-1
The base URL is: http://gisdata.usgs.gov/TDDS/DownloadFile.php
Followed by the following arguements:
TYPE
- ned1g_zip = NED 1 arc sec, ArcGrid format
- ned1f_zip = NED 1 arc sec, GridFloat format
- ned1i_zip = NED 1 arc sec, IMG format
- ned3g_zip = NED 1/3 arc sec, GridFloat format
- ...
FNAME
- The coordinates of the upper left corner of the tile. This is the actual filename of the Zip files on their server. Example: n36w100.zip would be the tile with an upper left corner at Lat/Long 36,-100
ORIG
- TNM - Let's just pretend we're the National Map Viewer...
dlpre
- This one is not required. (If you select a large area with more than one tile, it signifies the which number tile out of the total number tiles you're downloading).
I'm thinking this would be the preferred way to do things, but you'll probably notice that DownloadFile.php is just generating the actual URL of the tile.....
So in reality, the location of the tiles look like this:
http://tdds3.cr.usgs.gov/Ortho9/ned/ned_1/grid/n38w102.zip
http://tdds3.cr.usgs.gov/Ortho9/ned/ned_13/grid/n38w102.zip
http://tdds3.cr.usgs.gov/Ortho9/ned/ned_13/float/n38w102.zip
Which again we can easily break down into
- ned_1, ned_13
- grid, float, img
- filename of tile.zip
For Landcover:
http://tdds3.cr.usgs.gov/ortho9/nlcd/2006/landcover/conus/NLCD2006_LC_N39W072_v1.zip
This method does not work well with higher resolution data (1/9 arc second DEM, orthoimagery) because the filenames don't follow a simple pattern.
Best Answer
This is the web directory where the data is stored for their webapp.
https://edcintl.cr.usgs.gov/downloads/sciweb1/shared/topo/downloads/GMTED/
There is a directory that has zip files for the grids
