ncdf_browser.pro
7.98 KB
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;+
; NAME:
; NCDF_BROWSER
;
; PURPOSE:
;
; This program is designed to make it easier to browse and read the
; data and metadata in netCDF and HDF files. The user can browse files,
; and read the data and metadata into main-level IDL variables. New netCDF
; and HDF files can be opened at any time. The user interacts with the
; program via a browser window (GUI). This program is a wrapper for the
; NCDF_DATA object (ncdf_data__define.pro), which must also be downloaded.
;
; Note that only HDF files with scientific datasets (SD) can be read currently.
; There is no support for VDATA objects or other objects sometimes found in HDF
; files. Also note that when variables are returned from HDF files, they are returned
; in a calibrated form, if calibration information about the variable is present in the
; file. Calibration information is presented as an extra variable attribute in the
; browser.
;
; calibratedData = calData.cal * (uncalibratedData - calData.offset)
;
; AUTHOR:
;
; FANNING SOFTWARE CONSULTING
; David Fanning, Ph.D.
; 1645 Sheely Drive
; Fort Collins, CO 80526 USA
; Phone: 970-221-0438
; E-mail: david@idlcoyote.com
; Coyote's Guide to IDL Programming: http://www.idlcoyote.com
;
; CATEGORY:
; File I/O
;
; CALLING SEQUENCE:
;
; IDL> NCDF_Browser, filename
;
; Arguments:
;
; filename: The name of a netCDF and HDF file to open and browse.
;
; KEYWORD PARAMETERS:
;
; EXTENSION: In general, netCDF and HDF files use *.nc, *.ncf, *.ncdf and *.hdf file extensions to
; identify themselves as netCDF and HDF files. Some users have their own file extensions.
; You can use this keyword to identify the file extension you wish to use. If
; set here, it will be used as the file filter in place of the normal file
; extensions in DIALOG_PICKFILE.
;
; obj = ('NCDF_DATA', file, EXTENSION='*.bin')
;
; NO_NEW_FILE: If this keyword is set, then the button that allows a new file to be open
; on the browser is not created.
;
; NO_READ_ON_PARSE: Normally, when a file is opened it is parsed for information.
; One piece of information is the minimum and maximum values of the variables.
; This requires actually reading the variables. This can slow things down
; considerably is the variable is large. Setting this keyword will suppress
; the reading of the variables during the parsing of the data file, with the
; result that no minimum or maximum values will be reported.
;
; TITLE: Set this keyword to a string that is on the title bar of the browser.
;
; XOFFSET: Set this keyword to the X offset in pixels of the top-left corner of the browser.
;
; YOFFSET: Set this keyword to the Y offset in pixels of the top-left corner of the browser.
;
; NOTES:
;
; This program is only a (useful) front-end for a more flexible
; object program of class NCDF_DATA. In this front end, the NCDF_DATA
; object is created and then destroyed when the GUI is destroyed.
; The NCDF_DATA object can be used to read netCDF data in a non-interactive
; way, if you prefer not to use a GUI to interact with the data file.
;
; MODIFICATION HISTORY:
; Written by: David W. Fanning, 03 Feb 2008. Used ideas from many
; people, including Chris Torrence, Ken Bowman, Liam Gumely,
; Andrew Slater, and Paul van Delst.
; Added Extension keyword. DWF. 04 Feb 2008.
; Added error handling and protection for NCDF variables that have a dimension of length zero. 22 April 2009. DWF.
; Added NO_READ_ON_PARSE keyword. 22 April 2009. DWF.
; Now convert NCDF CHAR type variables to strings on output. 22 April 2009. DWF
; Made the default value of NO_READ_ON_PARSE set to 1. 25 June 2009. DWF.
; Added NO_NEW_FILE keyword to suppress the Open File button. 3 February 2010. DWF.
; Added TITLE, XOFFSET, and YOFFSET keywords. 5 February 2010. DWF.
; Fixed a problem with memory leakage when the input file cannot be read. 1 May 2010. DWF.
;-
;******************************************************************************************;
; Copyright (c) 2008-2010, by Fanning Software Consulting, Inc. ;
; All rights reserved. ;
; ;
; Redistribution and use in source and binary forms, with or without ;
; modification, are permitted provided that the following conditions are met: ;
; ;
; * Redistributions of source code must retain the above copyright ;
; notice, this list of conditions and the following disclaimer. ;
; * Redistributions in binary form must reproduce the above copyright ;
; notice, this list of conditions and the following disclaimer in the ;
; documentation and/or other materials provided with the distribution. ;
; * Neither the name of Fanning Software Consulting, Inc. nor the names of its ;
; contributors may be used to endorse or promote products derived from this ;
; software without specific prior written permission. ;
; ;
; THIS SOFTWARE IS PROVIDED BY FANNING SOFTWARE CONSULTING, INC. ''AS IS'' AND ANY ;
; EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES ;
; OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT ;
; SHALL FANNING SOFTWARE CONSULTING, INC. BE LIABLE FOR ANY DIRECT, INDIRECT, ;
; INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED ;
; TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; ;
; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ;
; ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT ;
; (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS ;
; SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. ;
;******************************************************************************************;
PRO NCDF_BROWSER, filename, $
EXTENSION=extension, $
NO_NEW_FILE=no_new_file, $
NO_READ_ON_PARSE=no_read_on_parse, $
TITLE=title, $
XOFFSET=xoffset, $
YOFFSET=yoffset
; Error handling.
CATCH, theError
IF theError NE 0 THEN BEGIN
CATCH, /CANCEL
void = cgErrorMsg()
RETURN
ENDIF
IF N_Elements(extension) EQ 0 THEN extension = '*.nc;*.ncd;*.ncdf;*.hdf'
IF N_Elements(no_read_on_parse) EQ 0 THEN no_read_on_parse = 1
; Need a filename?
IF N_Elements(filename) EQ 0 THEN BEGIN
filename = cgPickfile(/READ, TITLE='Select a File to Open', $
FILTER=extension)
ENDIF
IF filename EQ "" THEN RETURN
; Create an nCDF_DATA browse object.
ncdfObj = Obj_New('NCDF_DATA', filename, /Destroy_From_Browser, EXTENSION=extension, $
NO_READ_ON_PARSE=no_read_on_parse)
IF Obj_Valid(ncdfObj) THEN BEGIN
ncdfObj -> Browse, NO_NEW_FILE=Keyword_Set(no_new_file), $
XOFFSET=xoffset, YOFFSET=yoffset, SUCCESS=success, TITLE=title
IF ~success THEN Obj_Destroy, ncdfObj
ENDIF
END