NCAR Command Languageand its Application with HDF and HDFEOS

Wei Huang, Dave Brown, Mary Haley,Rick Brownrigg, Dennis Shea, Adam Phillips

Quick Access to HDF and HDFEOS data with NCLNCL (NCAR Command Language) is an interpreted language designed

specifically for scientific data analysis and visualization.

Excellent file handling: Easy access to h4, h5, he, and he5.

“ncl_filedump” can be used to check what is in a file quickly.

“ncl_convert2nc” converts HDF and HDFEOS (and other) data to NetCDF file.

Figure 1. Process and visualize HIRDLS data (Left O3, right the track)

Handling HIRDLS dataNCL can process and visualize HIRDLS data.

Below is a sample of O3 via OpenDap.

Figure 1a HIRDLS Time Series

Figure 1b HIRDLS track

OMI-Auro-L3 dataA plot of O3 from OMI-Auro-L3 data via OpenDap.

Figure 2 OMI-Auto-L3, O3 Column Amount

Figure 3 Monthly Surface Reflectance (January)

Figure 4 Radiactive Cloud Fraction

HDF5 dataProcessing and Visualizing HDF5 dataset

Figure 5 Blue (left) and Red (right) Reflectance from a HDF5 file

Figure 6 Sea Surface Temperature (HDF5 with Compound data type)

Reference: http://www.ncl.ucar.edu/Applications/HDF.shtml

Contact: huangwei@ucar.edu