Thread: ascii to sac

I just asked the opposite question last week. :)
Below is the old way to do it using the convert command. I believe you
can also do it using the r/write commands. Something like

sac
r <ascii filename>
write over sac

You may want to make a copy of your ascii file since the r/write will
write over the file you input.

HTH,
Megan
CONVERT
SUMMARY:
Converts data files from one format to another.

SYNTAX:
CONVERT {FROM} {format} infile
{TO {format} outfile}|{OVER {format}}
where format is one of the following:
SAC|ALPHA

INPUT:
infile : The name of the input data file.

outfile : The name of the output data file.

OVER : Overwrite the input data file.

SAC : SAC formatted binary data file.

ALPHA : Alphanumeric equivalent of SAC binary data file.

DEFAULT VALUES:
CONVERT FROM SAC infile OVER SAC

DESCRIPTION:
This command converts a single data file from one format to another. It
will
be replaced in a future update with an improved system that will use the
READ
and WRITE commands.

________________________________

From: sac-help-bounces<at>iris.washington.edu
[sac-help-bounces<at>iris.washington.edu] On Behalf Of Januka
Attanayake
Sent: Monday, May 21, 2007 10:49 AM
To: sac-help<at>iris.washington.edu
Subject: [SAC-HELP] ascii to sac



Greetings:
Is it possible to convert an ascii file into a SAC file? if not how
would you read a simple ascii file in SAC?

Thanks !

Januka

Some on this list may have written programs for preparing data in "alpha"
or ascii format. To understand about sac file formats, I suggest you
spend time with the sac users manual at
http://www.iris.edu/manuals/sac/manual.html. Instructions like the
following may be helpful:

Sample Alphanumeric Data File

The header section and first five lines of the data section of a sample
SAC alphanumeric data file is shown below. You can reproduce this file
(with the entire data section) on your system by executing the following
commands:

u: FUNCGEN SEISMOGRAM
u: WRITE ALPHA TEMP1

You can then convert this alphanumeric file to a binary one and read it
into SAC with the following commands:

u: CONVERT FROM ALPHA TEMP1 TO SAC TEMP2
u: READ TEMP2

(cut and paste from the manual)

On Mon, 21 May 2007, Januka Attanayake wrote:

Greetings:
Is it possible to convert an ascii file into a SAC file? if not how would
you read a simple ascii file in SAC?

Thanks !

Januka