Search found 10 matches

by slsmit34
Mon Jul 08, 2024 3:46 pm America/New_York
Forum: Home
Question: Identifying PACE Rrs Wavelengths
Replies: 2

Re: Identifying PACE Rrs Wavelengths

I realized that this question was previously asked in this forum: https://forum.earthdata.nasa.gov/viewtopic.php?t=5552. The band wavelength is accessed in group sensor_band_parameters. I have difficulty accessing this group through python but can access it through SeaDas. Following up on that forum...
by slsmit34
Mon Jul 08, 2024 3:05 pm America/New_York
Forum: Home
Question: Identifying PACE Rrs Wavelengths
Replies: 2

Identifying PACE Rrs Wavelengths

Hello, I have been following Ocean Color's Jupyter notebook tutorial on file structure at L2 processing levels for OCI "PACE_OCI_L2_AOP_NRT" https://oceancolor.gsfc.nasa.gov/resources/docs/tutorials/notebooks/oci-file-structure/ I am able to successfully plot different rrs bands with the c...
by slsmit34
Fri Feb 23, 2024 11:35 am America/New_York
Forum: Home
Question: Calculating Rrs from EMIT L2A RFL
Replies: 4

Re: Calculating Rrs from EMIT L2A RFL

Hi m11keluis, thanks for reaching out. Image IDs: - 'EMIT_L2A_RFL_001_20230603T172005_2315412_008.nc', - 'EMIT_L2A_RFL_001_20230607T154124_2315810_001.nc', - 'EMIT_L2A_RFL_001_20230814T192838_2322613_005.nc', - 'EMIT_L2A_RFL_001_20230818T175401_2323012_005.nc', - 'EMIT_L2A_RFL_001_20230822T161909_23...
by slsmit34
Tue Feb 13, 2024 4:36 pm America/New_York
Forum: Home
Question: Calculating Rrs from EMIT L2A RFL
Replies: 4

Calculating Rrs from EMIT L2A RFL

Hello, I am working with L2A EMIT data from LP.DAAC (EMITL2ARFL). I was wondering if there is a way to calculate remote sensing reflectance (rrs) from the surface reflectance in this product? I did a simplified conversion (rrs = surface reflectance / pi) and got values that were still quite high (se...
by slsmit34
Tue Jan 16, 2024 12:43 pm America/New_York
Forum: Home
Question: Scaling and Offset: S3A/B, VIIRS
Replies: 1

Scaling and Offset: S3A/B, VIIRS

Hello, I noticed in variables for 'add_offset: 0.05' and 'scale_factor: 2.0E-6' in the Rrs Band_attributes for S3A/S3B EFR Ocean Color (OC) product (OLCIS3B_L2_EFR_OC) from OB.DAAC. Are these automatically applied to the .nc file, or do I need to scale and add the factor to the rrs measurements in t...
by slsmit34
Thu Dec 07, 2023 4:50 pm America/New_York
Forum: Home
Question: Python Sen3/OLCI download error
Replies: 8

Re: Python Sen3/OLCI download error

Hi Sean, Thanks so much! It works now. I have one last question - is there a way to use earthdata to access the .nc VIIRS collection that is on the oceancolor.gsfc.nasa.gov portal? All of the VIIRS collections I see on Earthdata (i.e. VNP09GA) are in .h5 format and not geolocated/scaled. The .nc for...
by slsmit34
Thu Dec 07, 2023 4:04 pm America/New_York
Forum: Home
Question: Python Sen3/OLCI download error
Replies: 8

Re: Python Sen3/OLCI download error

Hi Sean, Thanks! I saw that VIIRS data on the Earthdata portal is .h5, but on the oceancolor.gsfc portal it is .nc format. I prefer .nc, so I am going to use the ocean color site instead. I am trying to use the obdaac_download script you mentioned to download all viirs/modis,etc. data over a boundin...
by slsmit34
Mon Dec 04, 2023 3:02 pm America/New_York
Forum: Home
Question: Python Sen3/OLCI download error
Replies: 8

Re: Python Sen3/OLCI download error

Hi, By API, do you mean the earthdata search portal (https://search.earthdata.nasa.gov/search)? If so, yes, I can successfully download the files from both the earthdata search portal and clicking directly on link. I only encounter issues when passing the OB.DAAC OLCI/MERIS links through earthaccess...
by slsmit34
Thu Nov 30, 2023 11:16 am America/New_York
Forum: Home
Question: Python Sen3/OLCI download error
Replies: 8

Python Sen3/OLCI download error

Hello, I am encountering an issue with downloaded Sen3/OLCI EFR OC data from OB.DAAC through python with the earthaccess package. I can successfully search for granules and retrieve their url for download (see attached image 'download_script'). At this point, clicking on the download url allows me t...
by slsmit34
Thu May 18, 2023 10:43 am America/New_York
Forum: Home
Question: Geolocation shift for Chesapeake Bay scenes
Replies: 1

Geolocation shift for Chesapeake Bay scenes

Hello, I was comparing Hawkeye scenes with some other satellites, and I noticed a geolocation shift in the Chesapeake Bay. Coordinates in other satellite scenes (i.e. PRISMA, Sentinel2) do not correspond to the same location in Hawkeye. Please see the attached image for clarification. I overlaid coa...