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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.
Note: 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:
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 Brightness Temperatures |
| Description | IDL program that allows the user to view the data in graphical form. |
| Access | FTP |
| Usage Example | Usage Example - display_onset_of_melt.pro |
| Tool Name | display_ssmi_xa.pro |
|---|---|
| Applicable Data Sets | Snow Melt Onset Over Arctic Sea Ice from SMMR and SSM/I Brightness Temperatures |
| Description | IDL program that allows you to display brightness temperature grids for multiple days in an Xinteranimate window. |
| Access | FTP |
| Usage Example | IDL Routines for Passive Microwave Data: Usage Examples - display_ssmi_xa.pro |
| Tool Name | disp_bootstrap_ice_xa.pro |
|---|---|
| Applicable Data Sets | Bootstrap Sea Ice Concentrations from Nimbus-7 SMMR and DMSP SSM/I |
| Description | IDL program that will automatically display animations of the sea ice concentration grids. The routine works on both the daily and monthly sea ice files and allows users to 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 | Usage Example - disp_bootstrap_ice_xa.pro |
| Tool Name | disp_ssmi_ice_xa.pro |
|---|---|
| Applicable Data Sets | Nimbus-5 ESMR Polar Gridded Sea Ice Concentrations |
| Description | IDL program that will automatically display animations of the sea ice concentration grids. The routine works on both the daily and monthly sea ice files and allows users to 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 - disp_ssmi_ice_xa.pro |
| Tool Name | showice.m |
|---|---|
| Applicable Data Sets | Sea Ice Concentrations from Nimbus-7 SMMR and DMSP SSM/I Passive Microwave Data
Near Real-Time DMSP SSM/I Daily Polar Gridded Sea Ice Concentrations |
| Description | A Matlab program that displays an image of the sea ice concentration grids in either of two color scales. |
| Access | FTP |
| Tool Name | showice.pro |
|---|---|
| Applicable Data Sets | DMSP SSM/I Daily and Monthly Polar Gridded Sea Ice Concentrations |
| Description | IDL program that automatically displays images of the sea ice concentration grids of the GIF browse files. Note: This program is somewhat outdated and only works with IDL Versions 5.4 and lower since versions of IDL higher than 5.4 do not support reading or writing GIF images. Users who do not have access to IDL Version 5.4 and lower should use another method for viewing the GIF files such as a simple image editor or Web browser. |
| Access | FTP |
The data extraction tools allow the user to extract and read the data from the data files. The data extraction tools that are available are the following:
| Tool Name | extract_bootstrap_ice.pro |
|---|---|
| Applicable Data Sets | Bootstrap Sea Ice Concentrations from Nimbus-7 SMMR and DMSP SSM/I |
| Description | IDL program that extracts a time series of Bootstrap 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 | Usage Example - extract_bootstrap_ice.pro |
| Tool Name | extract_nasateam_ice.pro |
|---|---|
| Applicable Data Sets | DMSP SSM/I Daily and Monthly Polar Gridded Sea Ice Concentrations Nimbus-5 ESMR Polar Gridded Sea Ice Concentrations |
| Description | IDL program that extracts a time series of SSM/I 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 |
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.
The ocean masks are applicable to the following data sets: DMSP SSM/I Daily and Monthly Polar Gridded Bootstrap Sea Ice Concentrations, Sea Ice Concentrations from Nimbus-7 SMMR and DMSP SSM/I Passive Microwave Data, and Sea Ice Trends and Climatologies from SMMR and SSM/I. Please see the Ocean Masks from NSIDC Web page for a description of ocean 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.
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