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In preparation for the launch of the NASA/Indian Space Research Organization (ISRO) Synthetic Aperture Radar (NISAR) platform, NASA’s Jet Propulsion Laboratory (JPL) has developed some sample NISAR products for users to explore. These sample data give users an idea of what the NISAR data products will look like once the mission is operational. The sample data provide the opportunity to get familiar with formats and develop workflows that will support NISAR datasets.

The NISAR Sample Data Product Suite page on JPL’s NISAR website provides links to all available official sample products.

NASA’s Alaska Satellite Facility Distributed Active Archive Center (ASF DAAC) has developed this document to assist in working with the sample data products using various software suitable for visualizing, analyzing, and transforming geospatial data. 

Included are sections for working with the data in a Geographic Information Systems (GIS) environment (ArcGIS Pro and QGIS), exploring the data using Panoply, and transforming the data using Geospatial Data Abstraction Library (GDAL) commands:

ArcGIS Visualization/Exploration Tutorials

This section demonstrates how to use ArcGIS Pro to explore NISAR sample data. It is divided into two parts:

The documentation assumes that you have ArcGIS Pro open, a new project open based on the Map template, and access to both the Contents and Catalog panes.

Before diving into the details, there are a few key things to keep in mind:

  • The filenames for the NISAR products are very long. This can cause problems on Windows machines if they are stored deep in a directory structure or if the directory names are also long. Consider storing these products in a directory close to the root to avoid exceeding the maximum character limit for Windows paths.
  • All NISAR products will be in HDF5 format, but they are formatted in such a way that most software applications currently need to treat them as if they are netCDF files in order to access the spatial reference system information.

Esri introduced support for the NISAR product format with ArcGIS Pro release 3.4.0, which allows users to interact with NISAR HDF5 products just as they would any other multidimensional dataset. ArcGIS Pro versions prior to 3.4.0 still require that you employ workarounds to add the data; refer to the section for ArcGIS versions earlier than 3.4.0 for details.

Using ArcGIS Pro 3.4.0

This documentation was generated using ArcGIS Pro version 3.4.0, which supports NISAR HDF5 format products.

There are a few different methods available for adding variables from the NISAR HDF5 files to an ArcGIS Pro project, and most of the sample products support using any of these methods.

Now that you've added variables, you can dive into the visualization/exploration tutorials. Click on a product type below to view step-by-step instructions using ArcGIS 3.4.0 and higher.

Using Earlier Versions of ArcGIS Pro

Unless otherwise noted, this documentation was generated using ArcGIS Pro version 3.3.0.

You can also work with these products in ArcGIS Pro version 3.2.x, and differences in the illustrations will be largely cosmetic. ArcGIS Pro 3.1.x and earlier may interact differently with the products than the behavior described in this document.

QGIS Visualization/Exploration Tutorials

This section demonstrates how to use QGIS to explore NISAR sample data.

Click on a product type to view the steps for Visualization/Exploration using QGIS.

Panoply Exploration Tutorials

This section demonstrates how to use NASA's Panoply software to explore NISAR sample data.

This documentation assumes you have installed Panoply, and downloaded the NISAR sample data to a directory named nisar_sample_data on your local machine. The sample data package includes one Level-0 data file (L0B), four Level-1 data files (RSLC, RIFG, RUNW, ROFF), four Level-2 data files (GSLC, GUNW, GOFF, GCOV), and one Level-3 data file (SME2). We are going to explore and/or visualize each product.

Level-0 (L0b) and Level-1 (RSLC, RIFG, RUNW, and ROFF) can be loaded in Panoply correctly. Users can explore the data structure of these products. Since they are not projected into map space, we do not visualize them.

Click on a product type to view the steps for Exploration of the sample data using Panoply.

GDAL Data Access/Transformation Tutorials

This section guides accessing and transforming NISAR HDF5-formatted data with GDAL, using the GCOV sample dataset as the primary test case.

One important thing to remember is that the NISAR HDF5 products are actually more similar to NetCDFs. Notably, the spatial reference data is encoded using NetCDF Climate and Forecast (CF) Metadata Conventions. This means you need to specify an output format for some commands, otherwise GDAL will throw an error like ERROR 1: Cannot guess driver for output.h5. It also means that you should prepend the NISAR files with NETCDF:. This approach is demonstrated throughout the examples in this section. Note that while the formats are slightly different, you can still access the sub-datasets or groups the same way you would with an HDF5 file.

Access detailed info on what each of the products contain and sample data.

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