Search found 24 matches

by ASF - bhauer
Tue Apr 16, 2024 10:47 am America/New_York
Forum: Questions/Comments
Question: Downloading only high-res Radiometric Terrain Correction files for the whole world
Replies: 1

Re: Downloading only high-res Radiometric Terrain Correction files for the whole world

Using the ASF API (https://docs.asf.alaska.edu/api/basics/) or Python Search Module (https://docs.asf.alaska.edu/asf_search/basics/) are programmatic options that allow for large volume downloads.

The ALOS PALSAR RTC product package files cannot be downloaded individually.
by ASF - bhauer
Fri Apr 12, 2024 2:30 pm America/New_York
Forum: Questions/Comments
Question: Evaluating height of trees with high precision for different year
Replies: 9

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

The only free high-resolution DEM I am aware of is the 1-meter DEM from the US Geological Survey. But it only covers the continental United States, which does not serve your needs.
by ASF - bhauer
Sat Apr 06, 2024 7:22 pm America/New_York
Forum: Questions/Comments
Question: Evaluating height of trees with high precision for different year
Replies: 9

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

Dear Amir Farshadfar, Here are some information sources that I hope will answer your questions. 1. Some commercial sources for high-resolution DEMs https://www.pgc.umn.edu/data/earthdem/ https://www.l3harris.com/all-capabilities/elevation-data-digital-elevation-models https://www.prnewswire.com/news...
by ASF - bhauer
Wed Mar 27, 2024 5:54 pm America/New_York
Forum: Questions/Comments
Question: ASF API download authentication libcURL
Replies: 5

Re: ASF API download authentication libcURL

Loris, Following up with the API team, they suggest the following: Enclose the entire URL in single quotes; e.g., curl 'https://datapool.blahblah.edu/somefile?password=abc%21123' Only URL encode the `!` part of the password. If these don't help, you have the email address for the API team and they c...
by ASF - bhauer
Sat Mar 23, 2024 6:15 pm America/New_York
Forum: Questions/Comments
Question: Problem with bulk downloading python script on ASF vertex
Replies: 1

Re: Problem with bulk downloading python script on ASF vertex

We're not sure what exactly may be causing the file downloads to be blocked, but here are some possible reasons: The " 'Temporary' Redirect download @ Remote archive: \> http://1.1.1.3:80/ac\_portal/proxy.html?..." message seems like maybe you're behind some proxy that is "helping&quo...
by ASF - bhauer
Tue Mar 19, 2024 11:55 am America/New_York
Forum: Questions/Comments
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: Questions/Comments
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: Questions/Comments
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: Questions/Comments
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: Questions/Comments
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...