[gradsusr] calpuff model output in ascii matrix to grib format

Wed Aug 13 22:12:23 EDT 2014

I have no experience to write grib file although I have done some job to decode it. But it's easy for me to convert the data to GrADS binary or netCDF data formats which can be used in GrADS software.

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
**************************************************

From: claudiomet
Date: 2014-08-14 02:39
To: GrADS Users Forum
Subject: Re: [gradsusr] calpuff model output in ascii matrix to grib format
Hello Dr. Yaqiang Wang ! and thanks for the answer.

In effect, the files are Surfer grid files and actually I plot this files using a VBA script.
The coordinates are in UTM WGS-84, but I have no problems to transform to degree and replace with sed in each file, and delete the footer with extra information (a simple bash script to mass processing).

With all of this solved,  how can I create grib files and what kind of another extra info I need?
Thanks again!

2014-08-13 3:00 GMT-04:00 yaqiang.wang at gmail.com <yaqiang.wang at gmail.com>:
The data format is Sufer ASCII grid data format but with some extra information lines at the end.

The x and y coordinate are not longitude and latitude considering the values from the head lines of the data. So the projection parameters are needed to plot the data in rigth place on the earth or convert it to grib data format.

DSAA
100 100
463.3000 483.1000
7772.4004 7792.2002
0.4900E+02 0.1420E+04

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
**************************************************

From: claudiomet
Date: 2014-08-13 01:57
To: GRADS USERS
Subject: [gradsusr] calpuff model output in ascii matrix to grib format
Hi users!

I have a model called CALPUFF, one of the output format of this model are ASCII files in matrix format. I attach files for example, there are 5 files with 5 forecast hours.

the first five lines are only information:
1) format
2) number of points in x y
3) start and end coordinate in x
4) start and end coordinate in y
5) minimum and maximum value in entire matrix

and the rest of the file is the matrix.

How can I write this files in grib format (multiplie or single file) to plot this information in GrADS?

I'm reading articles like this

http://cookbooks.opengrads.org/index.php?title=Recipe-012:_Converting_GPCC_ASCII_files_to_Binary_and_GRIB-1

But I'm not a Fortran master :(

Thanks in advance!

-- 
Claudio Cortes N.

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-- 
Claudio Cortes N.
Project Engineer
Environmental Area
MICOMO S.A.
Tel: +56 (2) 22400516
Cel: +56 (9) 65871064
ccortes at micomo.cl
www.micomo.cl
Antonio Rabat Sur 6165, Vitacura
Región Metropolitana, Chile
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