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ITOP: Multi-Network Composite Highest Resolution Upper Air Data


This data set is a composite of radiosondes and dropsondes collected from 2 dropsonde and 6 radiosonde platforms (see Section 2.3) during the Impact of Typhoons on the Ocean in the Pacific (ITOP) 2010 project with data collected from 1 August 2010 through 31 October 2010. This project was conducted in the western Pacific Ocean. This composite contains a total of 1753 high resolution soundings. Included are dropsondes from the DOTSTAR Astra Jet (94 dropsondes) and two United States Air Force C-130 (683 dropsondes) as well as radiosonde data from the US National Weather Service sites in Guam, Chuuk, Koror, Majuro, Ponape and Yap (976 radiosondes). All soundings are provided at the highest possible resolution (i.e., the 'native' resolution) and were quality controlled by NCAR/EOL. Data are available in the NCAR/EOL Sounding Composite Format (columnar ASCII).

Data access

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Additional information

Data Quality final
  • 1.0 (2011-11-02)
  • 2.0 (2017-01-04):

    This version corrects a temperature dependent dry bias that was present in the Vaisala RD94 dropsonde relative humidity measurements. Both the relative humidity and dew point values have been corrected.

  • 3.0 (2017-04-13):

    It was discovered that the temperature dependent dry bias correction applied in Version 2.0 was incorrectly applied for the USAF C-130 dropsonde data.  This version corrects the USAF C-130 dropsonde data.  The DOTSTAR ASTRA dropsonde and NWS radiosonde data are unchanged from Version 2.0.

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Related projects
Spatial Type point
Frequency no set schedule
Language English
GCMD Science Keywords Expand keywords
Related links

Temporal coverage

Begin datetime 2010-08-01 00:00:00
End datetime 2010-10-31 23:59:59

Spatial coverage

Map data from IBCSO, IBCAO, and Global Topography.

Maximum (North) Latitude: 32.4871, Minimum (South) Latitude: 7.00
Minimum (West) Longitude: 116.36204, Maximum (East) Longitude: 171.30

Primary point of contact information

EOL Data Support <>

Additional contact information


UCAR/NCAR - Earth Observing Laboratory. 2017. ITOP: Multi-Network Composite Highest Resolution Upper Air Data. Version 3.0. UCAR/NCAR - Earth Observing Laboratory. Accessed 19 Apr 2024.

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