Tools

NSIDC provides software tools to extract and geolocate sea ice data in the polar stereographic projection derived from passive microwave instruments, as well as masking tools that limit the influence of weather effects on sea ice concentrations.

Tools for accessing the trends and climatologies, the visible and infrared, and the field observation data are available from the documentation for each data set. See the Data Summaries Web pages for links to the documentation.

These tools work with the following passive microwave sea ice data sets:

All tools are available via FTP and are grouped into the following categories:


Display Tools

The data tools allows the user to display data from the data files in various ways. The data display tools that are available are the following:

Tool Name display_onset_of_melt.pro
Applicable Data Sets Snow Melt Onset Over Arctic Sea Ice from SMMR and SSM/I-SSMIS Brightness Temperatures
Description IDL program that allows the user to view the data in graphical form.
Access FTP


Extraction Tool

The following data extraction tool allows the user to extract and read the data from the data files:

Tool Name extract_ice.pro
Applicable Data Sets Nimbus-5 ESMR Polar Gridded Sea Ice Concentrations
Sea Ice Concentrations from Nimbus-7 SMMR and DMSP SSM/I Passive Microwave Data
Bootstrap Sea Ice Concentrations from Nimbus-7 SMMR and DMSP SSM/I
Near-Real-Time DMSP SSM/I-SSMIS Daily Polar Gridded Sea Ice Concentrations
Description IDL program that extracts a time series of polar sea ice data. The extraction routine works on both the daily and monthly sea ice files allowing users to select and display sea ice concentrations. For monthly data, users may select which image threshold to view (0, 5, 10, or 15% ice cut off).
Access FTP
Usage Example IDL Routines for Passive Microwave Data: Usage Examples - extract_ice.pro

Geocoordinate and Pixel-Area Tools

The geolocation and pixel-area tools described here provide the same functionality for all polar stereographic passive microwave sea ice data sets at NSIDC. See the Polar Stereographic Geocoordinate and Pixel Area Tools Web page for information.


Masks

Ocean Masks

The ocean masks are applicable to the following data sets: Sea Ice Concentrations from Nimbus-7 SMMR and DMSP SSM/I-SSMIS Passive Microwave Data, and Sea Ice Trends and Climatologies from SMMR and SSM/I-SSMIS. Please see the Ocean Masks from NSIDC Web page for a description of ocean masks.

Land masks

The land mask, coastline, and latitude/longitude line files described here can be used for all polar stereographic passive microwave sea ice data sets at NSIDC. See the Polar Stereographic Data Masks and Overlays Web page for information.