NASA Data Made Easy: Getting Started with SAR
Seeing through the clouds with Synthetic Aperture Radar.
This log-ratio image over Huntsville, Alabama, was created from a pair of images acquired on 7/17/2009 and 9/04/2010, approximately one year apart. In the log-ratio image, unchanged features have intermediate gray tones (gray value around zero) while change features are either bright white or dark black. Black features indicate areas where radar brightness decreased while in white areas, the brightness has increased. Image: ASF DAAC 2017; Includes Material © JAXA/METI 2009, 2010.
NASA's airborne- and satellite-based instruments provide data that can be used in understanding a number of natural disasters, including flooding, cyclonic storms, earthquakes and landslides. However, during disasters, conditions are often not ideal for making observations using optical sensors. Synthetic aperture radar, or SAR, which uses the microwave region of the electromagnetic spectrum, is ideal in that it can penetrate cloud cover and "see through" darkness and weather, allowing a unique view of flood inundation, land cover changes, and modifications of the Earth's surface from landslides, earthquakes, and background tectonic motion.
NASA data are free and open, but can be challenging to use. NASA's Earth Science Data Systems (ESDS) program and Earth Observing System Data and Information System (EOSDIS) Distributed Active Archive Centers (DAACs) have developed resources and tools to overcome this challenge. Resources were developed for Geological Society of America workshops, NASA Data Made Easy: Getting Started with SAR.
NASA SAR Resources
General
- Search and Download SAR data in Earthdata Search
- Search and Download SAR data from NASA's Alaska Satellite Facility DAAC (ASF DAAC)
- What is Remote Sensing?
- What is SAR?
- Webinar: Part 1- Introduction to Synthetic Aperture Radar (SAR) Data
- Webinar: Part 2- Applications of SAR Data in GIS Environments
Uplift and subsidence associated with a June 2007 earthquake swam on Kilauea Volcano are depicted in this ALOS PALSAR interferogram. Kilauea Volcano, located on the southeast portion of the island of Hawaii, has been erupting continuously since 1993. Credit: Zhong Lu, USGS.
SAR Datasets for Disasters-related Applications
SAR Datasets for Forest Structure and Biomass Estimation
- Biological Diversity Data Pathfinder
- Biological Diversity Data Toolkit
- SAR Handbook: Comprehensive Methodologies for Forest Monitoring and Biomass Estimation
Tools for Generating and Working with Analysis-Ready SAR Datasets
- On-demand Radiometric Terrain Correction (RTC) Processing in ASF DAAC's Vertex
- RTC on Demand Story Map
- Hybrid Pluggable Processing Pipeline (HyP3)
- ASF DAAC's ArcGIS Toolbox
- ASF DAAC's Data Recipes
Presentations
- Introduction to SAR
- Discover Earth Science Resources at NASA Earthdata
- InSAR Workflow (demo within Earthdata's YouTube)
- SAR Applications for Surface Change in the SERVIR Network
- GIS Applications of SAR: Flood Mapping
- Measuring Fault Parameters and Slip Using GeoGateway Online Tools
These presentations are also available within Earthdata's Youtube playlist, NASA Data Made Easy.
Published October 21, 2020
Page Last Updated: Oct 25, 2021 at 3:41 PM EDT