Search found 8 matches

by gcaria
Wed Nov 15, 2023 3:32 am America/New_York
Forum: Questions/Comments
Question: Correction for different spectral bands of Landsat missions
Replies: 6

Re: Correction for different spectral bands of Landsat missions

Thanks. Related to this, I've just come across a number of papers that document how over the 27 years the Landsat 5 orbit changed by nearly 1 h and resulted in changes in the Landsat 5 observed solar zenith angle of > 10°. Is this effect taken into account by corrections/calibrations in the LS5 Coll...
by gcaria
Tue Nov 14, 2023 7:03 am America/New_York
Forum: Questions/Comments
Question: Correction for different spectral bands of Landsat missions
Replies: 6

Re: Correction for different spectral bands of Landsat missions

Thanks for the prompt reply.

In this page https://www.usgs.gov/landsat-missions/landsat-4-5-thematic-mapper-tm-calibration-notices, I see that the latest calibration notices for L5 refer to Collection 1. Where can I find information about Collection 2?
by gcaria
Mon Nov 13, 2023 4:30 am America/New_York
Forum: Questions/Comments
Question: Correction for different spectral bands of Landsat missions
Replies: 6

Correction for different spectral bands of Landsat missions

I am accessing the Landsat archive available through AWS S3 (https://registry.opendata.aws/usgs-landsat/) and since I am retrieving data from various Landsat missions (5,7,8,9) which use different spectral band definitions (e.g. the green band changed from LS7 to LS8) I am wondering whether this is ...
by gcaria
Tue Jan 17, 2023 12:02 pm America/New_York
Forum: Questions/Comments
Question: Landsat 8 panchromatic band data not available on S3
Replies: 1

Landsat 8 panchromatic band data not available on S3

When downloading data from the S3 Landsat 8 archive, specifically for the panchromatic band, it seems that only data from year 2015 onwards are available, while in the last months I was able to also download data from year 2013 onwards. It seems some data have disappeared from the S3 archive. This i...
by gcaria
Sun Mar 20, 2022 2:00 pm America/New_York
Forum: Questions/Comments
Question: Broken CMR query for downloading GEDI L4A data
Replies: 3

Broken CMR query for downloading GEDI L4A data

Hi, I am getting the following error while running the very first few lines of this github tutorial: https://github.com/ornldaac/gedi_tutorials/blob/main/1_gedi_l4a_search_download.ipynb The code was working correctly only a few days/weeks ago. [code] In [1]: import requests ...: ...: doi = '10.3334...
by gcaria
Sat Mar 05, 2022 2:18 am America/New_York
Forum: Questions/Comments
Question: Fixed uncertainty for GEDI AGBD
Replies: 5

Re: Fixed uncertainty for GEDI AGBD

Thanks for your answer. In the plots you have posted I can see the same issue I'm reporting, that is agbd_se with an almost constant value (I'm assuming agbd itself actually does vary significantly in magnitude in the data used for your plots). To be more specific about my case, I've made the attach...
by gcaria
Fri Mar 04, 2022 4:04 am America/New_York
Forum: Questions/Comments
Question: Fixed uncertainty for GEDI AGBD
Replies: 5

Fixed uncertainty for GEDI AGBD

Hi, I am using the L4A V2 GEDI data for an area in Colombia, and when I look at the uncertainty variable "agbd_se" I only see values which are either around 13 or around 3. It seems that while the "agbd" variable itself can vary across a wide range of values, the uncertainty &quo...
by gcaria
Tue Feb 08, 2022 11:34 am America/New_York
Forum: Questions/Comments
Question: Coordinates of Landsat8 raster data
Replies: 1

Coordinates of Landsat8 raster data

Hi, I am using Landsat8 data, specifically taken from `usgs-landsat/collection02/level-2/standard/oli-tirs`, and while I can read the data correctly, I am wondering to what point of the raster cell its coordinates refer to, e.g. a given corner or the center. Just to be clearer, reading a file I can ...