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I'm trying to get some DAP data from noaa, but can't figure out how to pass variables to it. I've looked and looked and haven't found how to just poke around at it with my browser. The data is located at http://nomads.ncep.noaa.gov:9090/dods/ruc/ruc20110725/ruc_f17.info (which may become outdated some time after this post sits around.)

I want to access the ugrd10m variable with the variables time, latitude, and longitude. Any ideas what url is needed to do this?

Vladimir F Героям слава
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Kyle Hotchkiss
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2 Answers2

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According to their documentation, it sounds like you want to point your browser at a URL like:

http://nomads.ncep.noaa.gov:9090/dods/ruc/ruc20110914/ruc_f17.ascii?ugrd10m[0:1][0:1][0:1]

That will return a table of the ugrd10m values for the first two time/lat/lon points:

ugrd10m, [2][2][2]
[0][0], 9.999E20, 9.999E20
[0][1], 9.999E20, 9.999E20

[1][0], 9.999E20, 9.999E20
[1][1], 9.999E20, 9.999E20


time, [2]
734395.0, 734395.0416666666
lat, [2]
16.281, 16.46570909091
lon, [2]
-139.856603, -139.66417731424

The number of time/lat/lon points is given under the long description of ugrd10m at the dataset info address:

http://nomads.ncep.noaa.gov:9090/dods/ruc/ruc20110914/ruc_f17.info

time: Array of 64 bit Reals [time = 0..18]

means that there are 19 different time values, at indexes 0 to 18. In this case, the complete dataset can be retrieved by setting all the ranges to the max values:

http://nomads.ncep.noaa.gov:9090/dods/ruc/ruc20110914/ruc_f17.ascii?ugrd10m[0:18][0:226][0:427]

blahdiblah
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  • Data looks a bit more sane than the below answer. I understand that the 9.999E20 is a fill value? or something that doesn't matter. So you shove a range into the brackets I'll assume? – Kyle Hotchkiss Sep 14 '11 at 19:49
  • Yeah, updated to discuss ranges a bit more. Much of the data is fill, but there are some real values for a subset of time/lat/lon coordinates. – blahdiblah Sep 14 '11 at 19:56
  • I still have a bit to learn towards this, but I have been searching for this kind of help for a long time now. Thanks @blahdiblah. – Kyle Hotchkiss Sep 14 '11 at 19:58
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According to this reference, you can access data with this URL:

http://nomads.ncep.noaa.gov:9090/dods/ruc/ruc20110914/ruc_00z.asc?ugrd10m&time=19&time=227&time=428

However, I can't confirm the data's validity.

Joel A. Villarreal Bertoldi
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