Search found 29 matches

by ASF - bhauer
Tue Mar 19, 2024 11:55 am America/New_York
Forum: Home
Question: Evaluating height of trees with high precision for different year
Replies: 9

Re: Evaluating height of trees with high precision for different year

If you are looking for a publically available and recent DEM, your best option is the Copernicus Global and European Digital Elevation Model. Data for the elevation model were acquired through the TanDEM-X mission between 2011 and 2015 Information and sources to download these DEMs can be found usin...
by ASF - bhauer
Wed Feb 28, 2024 1:13 pm America/New_York
Forum: Home
Question: ASF API download authentication libcURL
Replies: 5

Re: ASF API download authentication libcURL

Hello Loris,
The API team provides a troubleshooting section in their user guide that I hope can provide you an answer:

https://docs.asf.alaska.edu/api/troubleshooting/

Thanks,
Bill
by ASF - bhauer
Fri Feb 23, 2024 12:23 am America/New_York
Forum: Home
Question: ASF API download authentication libcURL
Replies: 5

Re: ASF API download authentication libcURL

Hello Loris,
Try enclosing the password in single quotes ('password') and let us know if this doesn't help. And it doesn't hurt to enclose the username in quotes as well.

Thank you,
Bill Hauer
by ASF - bhauer
Mon Feb 05, 2024 2:29 pm America/New_York
Forum: Home
Question: The next resolution
Replies: 1

Re: The next resolution

The DEM file included with the ALOS PALSAR RTC product .zip file is a copy of an open-source DEM that was downloaded, modified, and used to perform radiometric terrain correction (RTC) on an ALOS PALSAR granule. The height values of the modified DEM differ from the source DEM because an ellipsoid co...
by ASF - bhauer
Mon Jan 22, 2024 7:19 pm America/New_York
Forum: Home
Question: Sentinel-1 Interferograms in EarthData
Replies: 3

Re: Sentinel-1 Interferograms in EarthData

The unwrapped interferogram is the displacement product, according to JPL (https://aria.jpl.nasa.gov/products/standard-displacement-products.html). They do not provide individual files for vertical and line-of-site displacement like the ASF HyP3 On Demand service provides. If you would like more inf...
by ASF - bhauer
Wed Jan 17, 2024 9:32 pm America/New_York
Forum: Home
Question: Sentinel-1 Interferograms in EarthData
Replies: 3

Re: Sentinel-1 Interferograms in EarthData

If you download a "Sentinel-1 Interferograms - Unwrapped Phase" (https://search.earthdata.nasa.gov/search/granules?p=C1595765183-ASF&pg[0][v]=f&pg[0][gsk]=-start_date&q=sentinel-1%20interferograms&tl=1705544619.393!3!!) product, it will be in GeoTIFF format and can be opene...
by ASF - bhauer
Mon Jan 08, 2024 2:45 pm America/New_York
Forum: Home
Question: When does new Sentinel-1 data become available through ASF
Replies: 5

Re: When does new Sentinel-1 data become available through ASF

Hello Drew, A system issue that developed around the start of the new year affected the transfer of Sentinel-1 data from ESA. This was resolved, and the transfer resumed. However, the backlog of data that resulted took some time to clear, and I suspect this is the cause of the delay in finding new d...
by ASF - bhauer
Wed Dec 27, 2023 5:29 pm America/New_York
Forum: Home
Question: Sentinel-1 RTC via ASF - OPERA
Replies: 2

Re: Sentinel-1 RTC via ASF - OPERA

Hello Peter, ASF does not process OPERA products but is the distributor for the products created by the OPERA team at JPL. They do not plan on back-processing RTC products like they plan on doing with the CSLC products. If you've incorporated SNAP into your RTC processing workflow, you might take a ...
by ASF - bhauer
Fri Nov 17, 2023 1:04 pm America/New_York
Forum: Home
Question: When does new Sentinel-1 data become available through ASF
Replies: 5

Re: When does new Sentinel-1 data become available through ASF

Sentinel-1 products are ingested at ASF as they are received from ESA. These then become available to download immediately. This process is continuous unless there is a problem with our data "pipeline." We recently experienced one of these problems, where the volume of data received from E...
by ASF - bhauer
Wed Nov 01, 2023 9:54 pm America/New_York
Forum: Home
Question: UAVSAR Data Consultation
Replies: 4

Re: UAVSAR Data Consultation

Newer versions should reflect improvements/enhancements/corrections to the processing algorithm. I would suggest that you pick the latest version and only use these data for your analysis.