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The lag time between observations and availability of MODIS products is only a few days. Lag time may be extended due to satellite maneuvers and extra quality assurance required for the geolocation data after the maneuver. The MODAPS Terra and Aqua websites contain information on data outages due to satellite maneuvers and instrument failures affecting processing.

The lag time between observations and availability of VIIRS products is only a few days. Lag time may be extended due to satellite maneuvers and extra quality assurance required for the geolocation data after the maneuver. The MODAPS VIIRS/NPP website contains information on data outages due to satellite maneuvers and instrument failures affecting processing.

The NASA Earthdata Cloud is the NASA cloud-based archive of Earth observations. It is hosted by Amazon Web Services (AWS). Learn how to find and access NSIDC DAAC data directly in the cloud.

Data from the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC) can be accessed directly from our HTTPS file system. We provide basic command line Wget and curl instructions for HTTPS file system downloads below.For questions about programmatic access to NSIDC DAAC data, please contact NSIDC User Services: nsidc@nsidc.org

All data from the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC) is directly accessible through our HTTPS file system using Wget or curl. This article provides basic command line instructions for accessing data using this method.

List of available files The following program files are available for download via HTTPS, along with the TOVS Pathfinder Path-P Daily and Monthly Polar Gridded Atmospheric Parameters data files, in the /tools/ directory.

This articles provides an example MATLAB snippet to read and plot SMAP/Sentinel-1 L2 Radiometer/Radar 30-Second Scene 3 km EASE-Grid Soil Moisture HDF5 soil moisture and brightness temperature data, as well as the related surface and quality flags. These flags are useful for determining the overall quality and surface conditions present when the data were collected by the satellite. %Comment Assign filename to the local variable  >>L2_SM_SP_fname = 'SMAP_L2_SM_SP_1BIWDV_20170908T132624_20170909T003903_102W47N_D17000_001.h5'; 

This article highlights the NSIDC DAAC data sets available with customization options and outlines a workflow for searching, ordering, and customizing data in NASA Earthdata Search. This approach is ideal for users who want to download data to their local machine.

Because MODIS sensors have flown on both the Terra and Aqua satellites, NSIDC offers parallel  products derived from MODIS on each satellite. Terra and Aqua products are very similar with a few key differences:

HDFView https://support.hdfgroup.org/products/java/hdfview/ When you first open HDFView, the HDFView window appears with an empty tree and data panel.

The NSIDC Python Reformatting and Subsetting (PyRS) tool is a command line tool which prompts the user to specify data reformatting and subsetting preferences. Output formats available are native, GeoTIFF, and NetCDF. If the dataset is polar stereographic, subsetting can be performed in the projected coordinate system, or the WGS84 coordinate space. PyRS can be used with the following data sets:

The following table lists important KVPs associated with the Common Metadata Repository (CMR) file search, as well as all KVPs available for subsetting, reformatting, and reprojection services. Please see the CMR Search API Documentation page for additional information on CMR parameters.>

Introduction NSIDC developed a number of IDL programs to browse and visualize TOVS Pathfinder Path-P Daily and Monthly Polar Gridded Atmospheric Parameters data files. The IDL tools described in this tutorial are available via HTTPS, along with the aforementioned data set, in the /tools/ directory. For instructions on installing these tools, see the Getting Started section below.

The TOVS Level 1b data for some days were either unavailable or of insufficient quality to use as ingest into the Path-P processing algorithm. Currently, empty files exist as placeholders for these dates until compatible data can be obtained.

The NSIDC DAAC Earthdata Cloud collections are stored in Amazon Simple Storage Service (Amazon S3), a secure, scalable object storage service. If you plan to work directly with data in the cloud or use command-line tools, it’s helpful to understand how S3 buckets and URLs are structured.This guide explains:

The following table lists the tools and services available for VIIRS data.

NASA Worldview is a map interface that allows users to interactively browse imagery, create visualizations, and download the underlying data.

NASA's Global Imagery Browse Services (GIBS) provides up to date, full resolution imagery for selected NSIDC DAAC data sets. Adding GIBS layers via OGC methods, such as Web Map Service (WMS), Web Map Tile Service (WMTS) and Tiled Web Map Service (TWMS) provides an easy way to visualize the entire time series of these data in commerical tools like Arc

This webinar introduces the ICESat-2 mission and shows you how to explore, access and customize ICESat-2 data with the OpenAltimetry application, using NSIDC DAAC tools, and shows you how to subset, reformat and analyze the data using Python. This webinar was originally presented on July 23, 2019, and is available on the NASA Earthdata Youtube channel.

The main differences between the DMSP SSM/I-SSMIS Pathfinder Daily EASE-Grid Brightness Temperatures, Version 2 (NSIDC-0032) and the MEaSUREs Calibrated Enhanced-Resolution Passive Microwave Daily EASE-Grid 2.0 Brightness Temperature ESDR, Version 1 (NSIDC-0630) data sets are described in Table 1.