AWS Open Data Bucket - ASF SAR Data Products for Disaster Events
Welcome to the AWS Open Data Bucket hosting Synthetic Aperture Radar (SAR) data products provided by the Alaska Satellite Facility (ASF). This repository is dedicated to offering valuable SAR data supporting responses to a range of disaster events.
This repository contains a number of different prefixes, some supporting specific response efforts, and others supporting general disaster response services.
Table of Contents
- Introduction
- Data Products
- Disaster Support Services
- Disaster Event Prefixes
- Accessing the Data
- License
- Manifest
Introduction
Synthetic Aperture Radar (SAR) data is a powerful tool for monitoring and assessing disaster events. The Alaska Satellite Facility (ASF) has curated this collection of SAR data products, making it accessible to the public through this AWS Open Data Bucket. The data covers a range of disaster events, providing valuable insights for researchers, scientists, and emergency response teams.
Data Products
The AWS Open Data Bucket contains a variety of SAR data products, including but not limited to:
-
Radiometrically Terrain Corrected (RTC) Data: Providing near real-time SAR observations for rapid analysis.
- See ASF's RTC On Demand Product Guide for a detailed overview of this dataset type.
-
Interferometric Synthetic Aperture Radar (InSAR) Data: Offering insights into ground deformation and displacement.
- See ASF's InSAR On Demand Product Guide for a detailed overview of this dataset type.
-
Change Detection Maps: Products highlighting significant changes between SAR acquisitions.
Each disaster event folder includes relevant data products in multiple formats to accommodate different analysis needs.
Disaster Support Services
These datasets are generated by ASF in support of ongoing monitoring services. They include ASF's standard Sentinel-1 On-Demand RTC products, along with surface water extent products generated using the HydroSAR workflow.
The products include the following:
- VH.tif - Sentinel-1 RTC image in VH polarization
- VV.tif - Sentinel-1 RTC image in VV polarization
- VV.tif.xml - Metadata file for the VV GeoTIFF, including information about the Sentinel-1 source raster and the processing workflow
- WM.tif - Surface water extent raster
- WM_HAND.tif - Height Above Nearest Drainage, used to generate the WM product
- dem.tif - Copy of the Digital Elevation Model used to process the RTC product (Copernicus GLO-30 DEM with an ellipsoid correction applied)
- rgb.tif - False-color RGB Decomposition, combining both VV and VH returns
Note that the WM (surface water extent) products have only been validated in the Hindu Kush Himalayan region. While they are available for other areas, they may not perform well in all cases. Use caution when referencing these products, as areas with very dry or frozen soils may be classified as surface water.
These products can be explored and accessed through interactive web applications, which are regularly updated to include new acquisitions. They are hosted in the following prefixes:
- image-services/RTC_services
- HKHwatermaps
RTC Services
The files in the image-services/RTC_services prefix are generated to support the NASA Earth Science Applied Science Disasters program. These products cover the east and west coasts of the United States and the entire state of Alaska.
ASF has published image services for the VV, VH, and RGB products hosted under this prefix. These image services allow the data to be available immediately to disaster response personnel, without any additional processing. They can be explored interactively in this web map.
New Sentinel-1 acquisitions are processed to RTC and transferred to this prefix every three hours, and image services are updated daily.
Mosaic-level overviews in Cloud Raster Format (CRF) are generated for these services and hosted in the image-service-overviews prefix.
WM products are also available, and can be explored in this web map, but use caution when interpreting the images, especially in arid regions and shoulder seasons where ground may be frozen or saturated.
HKHwatermaps
The HKHwatermaps prefix includes products generated over the Hindu Kush Himalayan (HKH) region in support of ICIMOD, which maintains image services and a web application for flood monitoring.
New Sentinel-1 acquisitions are processed to RTC and transferred to this prefix every three hours.
Disaster Event Prefixes
Some prefixes in this bucket reference a particular event. These prefixes help users quickly identify and navigate to the data corresponding to a particular event. The prefixes are a combination of the month/year of the disaster event, and the location affected by the event.
For example, the jan2024_japan prefix contains data products relevant for the earthquake in Japan on
January 1st, 2024.
Users can find the data for a specific disaster event by exploring the corresponding prefix.
Accessing the Data
To access the data, users can utilize the AWS S3 API or AWS Command Line Interface (CLI). The data is stored in the following structure:
s3://asf-event-data/{disaster_event_prefix}/{data_product}
For example:
s3://asf-event-data/jan2024_japan/S1A_IW_20231218T205948_DVP_RTC10_G_gpuned_AE77.zip
This structure allows for efficient and organized access to the SAR data products.
You can explore the contents of one of these prefixes using a command like:
aws s3 ls s3://asf-event-data/jan2024_japan/
To download a single product to your local directory, you can use a command like:
aws s3 cp s3://asf-event-data/jan2024_japan/S1A_IW_20231218T205948_DVP_RTC10_G_gpuned_AE77.zip .
License
The data in this AWS Open Data Bucket is provided freely and openly under the Creative Commons Zero (CC0) 1.0 Universal License. You may use this data for any purpose you would like.
Thank you for using the AWS Open Data Bucket for ASF SAR Data Products! If you have any questions or feedback, feel free to reach out to us.
Manifest
This section contains a list of all data products available for each disaster event. Please refer to the Data Products if you want to learn more about each product type.
jan2024_japan
- InSAR
- S1AA_20231225T205124_20240106T205124_VVR012_INT40_G_weF_D0E5.zip
- S1AA_20231225T205152_20240106T205151_VVR012_INT40_G_weF_F454.zip
- RTC
- S1A_IW_20231218T205948_DVP_RTC10_G_gpuned_AE77.zip
- S1A_IW_20231225T205124_DVR_RTC10_G_gpuned_52B6.zip
- S1A_IW_20231225T205152_DVR_RTC10_G_gpuned_B454.zip
- S1A_IW_20231230T205948_DVR_RTC10_G_gpuned_564C.zip
- S1A_IW_20240106T085056_DVR_RTC10_G_gpuned_2DEA.zip
- S1A_IW_20240106T205124_DVR_RTC10_G_gpuned_57A0.zip
- S1A_IW_20240106T205151_DVR_RTC10_G_gpuned_1A88.zip