[gradsusr] How to solve the problem for Julian date for grads.

Fri Oct 6 00:47:27 EDT 2017

Hello Artur,

The standard binary file of GrADS contains 4-byte folat data, but your binary file contains 2-byte short integer data. So you need to change the variable 'units field' (http://cola.gmu.edu/grads/gadoc/descriptorfile.html#VARS).

Regards
Yaqiang

*************************************************
Dr. Yaqiang Wang
Chinese Academy of Meteorological Sciences (CAMS)
46, Zhong-Guan-Cun South Avenue
Beijing, 100081
China

yaqiang.wang at gmail.com

http://www.meteothinker.com
https://www.researchgate.net/profile/Yaqiang_Wang5
**************************************************

From: Gevorgyan Artur
Date: 2017-10-06 01:10
To: GrADS Users Forum
Subject: Re: [gradsusr] How to solve the problem for Julian date for grads.
Dear Jennifer,

I highly appreciate your efforts to help me with this issue. Indeed, I am trying to map sattelite-derived precipitation data from PERSIANN-Cloud Classification System (PERSIANN-CCS) at 0.04° x 0.04° resolution. The near real-time and archive data at 1-hourly temporal resolution are placed at the following ftp adress:

ftp://persiann.eng.uci.edu/CHRSdata/PERSIANN-CCS/hrly/ 

The description of precipitation data files which I am trying to map through GrADS is provided in the readme.hrly file. Could you please look into the readme.hrly and precipitation files at the ftp adress in order to better undersatnd this issue ?

Thanks for your help !

Artur

05.10.2017, 18:51, "Jennifer M Adams" <jadams21 at gmu.edu>:
oops. math. Your file is too small, but I believe the factor is 2, not 4. —Jennifer

 On Oct 5, 2017, at 11:06 AM, Jennifer M Adams <jadams21 at gmu.edu> wrote:

 This error means that the file size is wrong. Based on your descriptor file, the file should be 9000 x 3000 x 4 bytes.

 I did not download, but if 54000000 is the file size, it is too small by a factor of 4. rgccs1h1618413.bin (54000000)
 —Jennifer
  On Oct 5, 2017, at 9:51 AM, Gevorgyan Artur <agm86 at yandex.ru> wrote:

 Dear Jennifer,

 You are right, but when I delete the double quote: “ in my DSET entry, I have another error, please see below:

 ga-> open Persian.ctl
 Scanning description file: Persian.ctl
 Data file rgccs1h%y2%j3%h2.bin is open as file 1
 LON set to 0 360
 LAT set to -59.98 59.98
 LEV set to 1 1
 Time values set: 2016:7:2:14 2016:7:2:14
 E set to 1 1
 ga-> d r
 Low Level I/O Error: Read error on data file
  Data file name = rgccs1h%y2%j3%h2.bin
  Error reading 36000 bytes at location 107964000
 Data Request Error: Error for variable 'r'
  Error ocurred at column 1
 DISPLAY error: Invalid expression
  Expression = r

 05.10.2017, 16:26, "Jennifer M Adams" <jadams21 at gmu.edu>: I think the problem is that you have an extra character (a double quote: “) at the end of your filename in your DSET entry. Here is a helpful debugging feature: After you open the descriptor file, invoke the command ‘set misswarn on 1’ (assuming this is file #1) and then try to display some data. If GrADS is unable to find the data file, it will tell you the name of the file it is looking for.

 ga-> set misswarn on 1
 ga-> d r
 Warning: Open error, fn = rgccs1h1618414.bin"
 Cannot contour grid - all undefined values

 —Jennifer

 On Oct 5, 2017, at 3:28 AM, Gevorgyan Artur <agm86 at yandex.ru> wrote:

 Dear Jenifer,

 Thanks for your reply! I tried to map the data using your suggestions, but I have this message when trying to display my data in GrADS: "Cannot contour grid - all undefined values"

 This is the content of my ctl file:

 DSET ^rgccs1h%y2%j3%h2.bin”
 OPTIONS template
 OPTIONS big_endian
 OPTIONS yrev
 UNDEF -9999
 TITLE Precipitation estimates
 XDEF 9000 LINEAR 0.02 0.04
 YDEF 3000 LINEAR -59.98 0.04
 ZDEF 01 LEVELS 1
 TDEF 1 LINEAR 14z02jul2016 1hr
 VARS 1
 r 1 99 hourly cmorph [ mm/hr*100.0 ]
 ENDVARS

 Please find the rgccs1h1618414.bin data file attached to my yandex disk.
 Could you please tell me what is wrong now ?

 Best regards,
 Artur

 04.10.2017, 16:48, "Jennifer M Adams" <jadams21 at gmu.edu>:
 Use ‘OPTIONS template’ and change your DSET entry to "DSET ^rgccs1h16%j314.bin”
 This will work with the TDEF you have in your descriptor file. It is fine to use templates even if you only have one data file.

 I noticed that your initial time value in your TDEF (00z) doesn’t match the hour in your filename (14z?). Try this instead:

 DSET ^rgccs1h%y2%j3%h2.bin”
 OPTIONS template
 TDEF 1 linear 14z02jul2016 1hr

 —Jennifer

 On Oct 3, 2017, at 2:14 AM, Gevorgyan Artur <agm86 at yandex.ru> wrote:

 Dear Sir/Madam,

 I have a sattellite derived precipitation field but in a Juilan date. I am not able visualize the data throught GrADS. Could you help me with this problem ?
 The Julian date is 184 (2, July).

 Please find attached the Descriptor file and data file (attached to my Yandex disk)

 Please note, that for monthly precipitation fileds the descriptor file works fine.

 Best regards,
 Artur

 rgccs1h1618413.bin (54000000)
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 Jennifer Miletta Adams
 Center for Ocean-Land-Atmosphere Studies (COLA)
 George Mason University

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 rgccs1h1618414.bin (54000000)
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 --
 Jennifer Miletta Adams
 Center for Ocean-Land-Atmosphere Studies (COLA)
 George Mason University

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 Jennifer Miletta Adams
 Center for Ocean-Land-Atmosphere Studies (COLA)
 George Mason University

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Center for Ocean-Land-Atmosphere Studies (COLA)
George Mason University

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