EOL Facility: 
Computing, Data and Software Facility (CDS)
Maintenance Status: 
Used by these EOL facilities: 
Visualization and quality control of upsonde and dropsonde radiosonde soundings. Command line, batch and GUI based interfaces are available. For support questions, email eol-aspen(at)ucar.edu.


Operating System: 

ASPEN Versions

The changes that are visible to users are given below. The many changes that are made for software maintenance and obscure bug fixes are not listed here.

Find the most recent revision number here, and locate that in the Downloads area below.

Note that due to web site limitations, the revisions are not sorted correctly in the Downloads area.


33304 — Sep 15, 2016

  • Consolidated the information (about) dialogs.
  • Fixed a synoptic map crash that was happening only on older MacBooks. OSX libspatialite was rolled back from version to 4.1.1 to version 4.3.0a. This also now matches the libspatialite versions on Linux and W7.

33297 — Sep 9, 2016

  • Fixed error in WMO section 5/6 coding of the surface thermo and surface winds. The error was introduced in version 33236.
  • Corrected several internal errors that led to application instability.

aspenfixrh-1.0 — Aug 24, 2016

  • First release of aspenfixrh, a python script to correct the temperature-dependent dry bias from certain Vaisala sonde sensor modules deployed in 2010 and later. It edits files in EOL, FRD, and AVAPS D-file format.

33270 — July 24, 2016

  • For OSX only: corrected missing library. Prior version 33265 was non-funtional.

33265 — July 14, 2016

  • Corrected the Aspen version number in the output files generated by the command line version of Aspen (Aspen-QC).
  • FIxed console output for W7 version of Aspen-QC.

33236 — May 27, 2016

  • Reworked the BatchAspen user interface.
  • Added levels database writing to BatchAspen.
  • Added the synoptic map display to BatchAspen.
  • Added BUFR output product generation.
  • Redesigned the dropsonde WL150 computation, to match the EditSonde procedure.
  • Dropsonde theoretical fall rate is now the default fall rate for time constant computations.
  • Added the Time-Dependent Dry Bias (TDDryBias) relative humidity correction for AVAPS dropsondes.
  • Important internal fixes leading to “valgrind” compliance.
  • Other usability improvements and bug fixes.

32179 — Aug 20, 2015

  • Adjustments to the buid environment. Sounding processing unchanged.

32172 — June18, 2015

  • Restore the Aspen-QC command line program to the OSX and W7 distributions.

32169 — June 15, 2015

  • Fixed the OSX distribution, which was crashing on startup.
  • Corrected the handling of input CLASS format files. The syntax checking is relaxed a bit, to support a small variation in the CLASS file header formatted, as generated by the NCAR DMG group.

32152 — May 28, 2015

  • Rework of the WL150 code in the 62626 group of the TEMPDROP message. Winds are interpolated if necessary to provide coverage over a full 150m layer.
  • Sensor ventilation rate is now taken from the theoretical fall rate rather than the observed fall rate. The old behavior is available via an option.
  • Options were reorganized onto more tabs.
  • Version scheme has been changed to VVCCC, where VV holds the release tag (VV:32 corresponds to release 3.2), and CCC represents the number of source commits on that tag.
  • EYE is no longer avaiable as an environment option for the 6262 group; use CENTER instead.

Note that on OSX Yosemite, due to a new Qt incompatibility, drag-and-drop is no longer avaiable. We are working on adding the file menu back to BatchAspen, but in the meantime BatchAspen is not functional on OSX Yosemite.


Derived from the HRD Editsonde program (1998). Initially developed for AFRES 53rd Hurricane Hunters real-time operations. Later expanded for general upsonde and dropsonde application.