[gradsusr] [EXTERNAL] New subsetting of Merra-2 data

Thu Mar 26 08:05:15 EDT 2020

Hii i have exercise but i am from Indonesian and my task about Hadley. Can
you help me?

Pada tanggal Kam, 26 Mar 2020 6.35 PM, Antoine Molin <amolin at plenr.fr>
menulis:

> Hi Jennifer,
>
>
>
> Well, your method (last email below) doesn’t work anymore, and it seems
> that the Nasa changed again its site…
>
>
>
> Using this method, i got for the february data the enclosed file
> « subset_M2T1NXSLV_5.12.4_20200326_101407.txt »,  different from the file i
> had for the january data (see subset_jan2020.txt) ; and i can’t get the
> data with wget anymore (see « Merra-2_wget-error.docx »).
>
> The same with the enclosed file
> « subset_M2T1NXSLV_5.12.4_20200326_110522.txt » , where i didn’t check the
> « Use selected region to crop files » in « Refine region ».
>
>
>
> Do you see what could be done ?
>
>
>
> Thanks a lot, and best regards.
>
>
>
>
>
> Antoine Molin
>
> Etudes de vent PlenR
>
> Tel : 09 67 06 77 23
>
>
>
> *De :* gradsusr [mailto:gradsusr-bounces at gradsusr.org] *De la part de*
> Adams, Jennifer M. (GSFC-610.2)[ADNET SYSTEMS INC]
> *Envoyé :* mardi 21 janvier 2020 20:17
> *À :* GrADS Users Forum
> *Cc :* gsfc-help-disc at lists.nasa.gov
> *Objet :* Re: [gradsusr] [EXTERNAL] New subsetting of Merra-2 data
>
>
>
> Hi, Antoine –
>
> The GES DISC help desk has opened a ticket to help you resolve the issue
> your having using wget to download a list of URLs.
>
>
>
> The problem of the new *.nc4.nc4 files being sufficiently different from
> the old *.SUB.nc files so that templating breaks … that is a different
> problem. I have an idea that may fix it, but it will require you to get a
> new list of URLs for the more recent MERRA-2 data subsets.
>
>
>
> From the MERRA-2 dataset landing page,
> https://disc.gsfc.nasa.gov/datasets/M2T1NXSLV_5.12.4/summary?keywords=M2T1NXSLV.5.12.4,
> click on the “Subset / Get Data” link at the bottom of the Data Access
> options in the box on the right hand side of the page. That will pop open a
> dialog box for you to enter the constraints of your subset. Use the “Refine
> Date Range” accordion to specify the desired date range. Use the “Spatial
> Subset” and “Variables” accordions to choose your lat/lon domain and
> variable list. Then open the “Time of Day” accordion and select all 24
> hours, from 00:30 through 23:30. Leave the “Grid” accordion with the
> default value of ‘None’, and change the “File Format” to ‘netCDF’.
>
>
>
> The URLs that you get when you click on the green “Get Data” button should
> have “servername/daac-bin/OTF/HTTP_services” in the URL instead of
> “servername/opendap/”. Adding the Time of Day constraint to your subset and
> selecting all times so you get every time step is what redirects your
> request away from opendap to HTTP_services and should give you files that
> (a) have the familiar *SUB.nc naming convention, and (b) a structure that
> is compatible with the older subsets you have already downloaded so that
> templating will work properly.
>
>
>
>
>
> Your URLs look something like this:
>
>
>
>
> https://goldsmr4.gesdisc.eosdis.nasa.gov/daac-bin/OTF/HTTP_services.cgi?FILENAME=%2Fdata%2FMERRA2%2FM2T1NXSLV.5.12.4%2F2019%2F12%2FMERRA2_400.tavg1_2d_slv_Nx.20191231.nc4&FORMAT=bmM0Lw&BBOX=42.2%2C-5.5%2C51.2%2C8.2&TIME=2019-12-31T00%3A30%3A00%2F2019-12-31T23%3A30%3A59&LABEL=MERRA2_400.tavg1_2d_slv_Nx.20191231.SUB.nc&SHORTNAME=M2T1NXSLV&SERVICE=SUBSET_MERRA2&VERSION=1.02&DATASET_VERSION=5.12.4&VARIABLES=SLP%2CT10M%2CU50M%2CV50M
>
>
>
> …instead of this:
>
>
>
>
> https://goldsmr4.gesdisc.eosdis.nasa.gov/opendap/MERRA2/M2T1NXSLV.5.12.4/2019/12/MERRA2_400.tavg1_2d_slv_Nx.20191231.nc4.nc4?SLP[0:23][264:282][279:301],T10M[0:23][264:282][279:301],U50M[0:23][264:282][279:301],V50M[0:23][264:282][279:301],time,lat[264:282],lon[279:301]
>
>
>
> I hope this explanation is clear and helps to resolve the incompatibility
> issues you’re having with the newer MERRA-2 subsets. Please let us know how
> it goes.
>
> --Jennifer
>
>
>
>
>
>
>
> --
> Jennifer Miletta Adams
> ADNET Systems, Inc.
> NASA/GSFC, Code 610.2
>
> Building 32, Room S159
> (301) 614-6070
>
>
>
>
>
> *From: *gradsusr <gradsusr-bounces at gradsusr.org> on behalf of Antoine
> Molin <amolin at plenr.fr>
> *Reply-To: *GrADS Users Forum <gradsusr at gradsusr.org>
> *Date: *Tuesday, January 21, 2020 at 11:02 AM
> *To: *"gradsusr at gradsusr.org" <gradsusr at gradsusr.org>
> *Subject: *[EXTERNAL] [gradsusr] New subsetting of Merra-2 data
>
>
>
> Hi,
>
>
>
> Nasa changed the way to get subsets of Merra-2 data, and that is a problem
> for me….
>
>
>
>    - First, i can’t succeed in getting one month of daily files with
>    wget, under Windows, after downloading the links of these daily files…
>
>
>
>    - Then, these new files are *.nc4.nc4 files ; i was used to *.SUB.nc4
>    files, and wanted to mix these 2 kinds of  files ; but for a same subset,
>    the file sizes are different !
>
>   i got same names (using rename *.nc4  *. «  »   and   rename *.nc4
> *.SUB.nc4), and can read these new files using xdfopen  (warning about the
> cachesize, but it is working) ;   but it is not possible to read mix files
> (using template in .ctl) with xdfopen .
>
>
>
> Has anybody a solution ?
>
>
>
> Thanks !
>
>
>
>
>
> Antoine Molin
>
> Etudes de vent PlenR
>
> Tel : 09 67 06 77 23
>
>
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