Sentinel-1 Frame Numbers

Use this Forum to find information on, or ask a question about, NASA Earth Science data.
Post Reply
nathanmthomas
Posts: 2
Joined: Thu Dec 16, 2021 11:31 am America/New_York
Answers: 0

Sentinel-1 Frame Numbers

by nathanmthomas » Sat Apr 22, 2023 6:59 pm America/New_York

The ASF FAQs state that that ASF uses its own Frame numbers for Sentinel-1:

"ASF DAAC assigns frames to Sentinel-1 product slices that refer to the same point temporally and geographically. In Vertex, search results then display all the products available over a point and time instead of listing the products for the same point individually. For example, a single Sentinel-1 slice can produce RAW, SLC, GRD and OCN products. ASF DAAC uses the internally generated frame number to group these products into a single Vertex search result and to create InSAR stacks or stacks used to color code Vertex results on the map to indicate approximate quantity of repeating observations with the same relative orbit and frame number."

Is it possible to get a kml/shp of these Frames? I am trying to search for data using HYP3 and a frame reference would be very helpful.

Filters:

ASF - bhauer
User Services
User Services
Posts: 40
Joined: Tue Dec 03, 2019 3:56 pm America/New_York
Answers: 0

Re: Sentinel-1 Frame Numbers

by ASF - bhauer » Thu Apr 27, 2023 3:23 pm America/New_York

There is no reference map available for Sentinel-1 ASF frames. Because of the dependence on time instead of a specific set of geographic coordinates when assigning frame numbers, "frame drift" can occur over time, where the frame number over the same spot may change.

I recommend using Vertex to identify the scenes that cover a location and then noting the frame numbers of those scenes to use when ordering through HyP3.

ASF is very close to providing the option to order Sentinel-1 data by burst number, which eliminates the time dependency and fixes a burst number to a specific location on the ground. We will then be able to provide a burst map for reference.

Thank you,
Bill Hauer
Bill Hauer
Alaska Satellite Facility DAAC
User Support Office
uso@asf.alaska.edu

Post Reply