Search found 18 matches

by kodiologist
Thu May 07, 2026 9:03 am America/New_York
Forum: Home
Question: Choosing MAIAC VIIRS tiles to cover a region
Replies: 8

Re: Choosing MAIAC VIIRS tiles to cover a region

The forum only restricts attachments by file name, not contents, so I just added a bogus ".pdf" extension and it let me upload the file:
MAIAC_tile_defs.csv.pdf
(61.65 KiB) Downloaded 113 times
by kodiologist
Fri Apr 24, 2026 7:47 am America/New_York
Forum: Home
Question: Choosing MAIAC VIIRS tiles to cover a region
Replies: 8

Re: Choosing MAIAC VIIRS tiles to cover a region

VIIRS uses the same HV tile grid as MODIS. That's what is also claimed on this page ( https://www.earthdata.nasa.gov/data/instruments/viirs ), but if you look at the figures, the relationships between the tile identifiers and geography are pretty different: https://earthdata.nasa.gov/s3fs-public/20...
by kodiologist
Tue Apr 21, 2026 10:15 am America/New_York
Forum: Home
Question: Choosing MAIAC VIIRS tiles to cover a region
Replies: 8

Choosing MAIAC VIIRS tiles to cover a region

Similar to my previous question about MODIS ( https://forum.earthdata.nasa.gov/viewtopic.php?p=13437 ), I want to find the tile identifiers for VJ119A2 and VNP19A2 to cover a region of interest, such as the contiguous United States. The tile structure is depicted visually in Figure 1b of the user gu...
by kodiologist
Thu Mar 26, 2026 11:03 am America/New_York
Forum: Home
Question: The time range for TEMPO N02 V03 via Harmony
Replies: 5

Re: The time range for TEMPO N02 V03 via Harmony

I see. Forgive me if this is off-topic, but I've noticed that Harmony login, at least with the Python library, is very slow: the line `client = harmony.Client(auth = ("Kodiologist", PASSWORD))` takes 2 minutes and 17 seconds. The option `should_validate_auth = False` only seems to defer th...
by kodiologist
Thu Mar 26, 2026 8:41 am America/New_York
Forum: Home
Question: The time range for TEMPO N02 V03 via Harmony
Replies: 5

Re: The time range for TEMPO N02 V03 via Harmony

Thanks. When I set `max_results = 2`, I get the same warning, but I can download a file, which is what matters. The warning is still produced with the result set expanded further with `temporal = {'start': date(2024, 6, 1), 'stop': date(2024, 6, 30)}` and `max_results = 10`.
by kodiologist
Wed Mar 25, 2026 10:14 am America/New_York
Forum: Home
Question: The time range for TEMPO N02 V03 via Harmony
Replies: 5

The time range for TEMPO N02 V03 via Harmony

The page https://cmr.earthdata.nasa.gov/search/concepts/C2930763263-LARC_CLOUD.html says that TEMPO N02 V03 covers 2023-08-02 to 2025-09-16. But when I try to download some data from June 2024, I get no files, and the message "WorkItem warned: nasa/harmony-opendap-subsetter:1.2.2: Temporal rang...
by kodiologist
Mon Sep 29, 2025 4:28 pm America/New_York
Forum: Home
Question: Getting point values from TEMPO L2 ozone profile V04 in R
Replies: 4

Re: Getting point values from TEMPO L2 ozone profile V04 in R

Yeah, I think that the cell with the closest centroid is not always the cell that contains the point of interest. Previously, in a project in which I was using TROPOMI observations, I was constructing a polygon mesh for each file and using point-in-polygon, with only minor optimizations. It was real...
by kodiologist
Mon Sep 29, 2025 12:23 pm America/New_York
Forum: Home
Question: Getting point values from TEMPO L2 ozone profile V04 in R
Replies: 4

Re: Getting point values from TEMPO L2 ozone profile V04 in R

That appears to read in an array well enough (which in R can be done with the `ncdf4` package), but without any geometry. I'm looking for a way to get values corresponding to points on land, such as longitude -73.953626, latitude 40.789693.
by kodiologist
Mon Sep 29, 2025 9:26 am America/New_York
Forum: Home
Question: Getting point values from TEMPO L2 ozone profile V04 in R
Replies: 4

Getting point values from TEMPO L2 ozone profile V04 in R

I've been looking at the recently released TEMPO_O3PROF_L2_V04 product. Given a NetCDF file (such as TEMPO_O3PROF_L2_V04_20250921T210803Z_S012G02.nc) and some points, I'd like to get the ozone values (`/product/ozone_profile`) from the bottom layer (layer 24) for the given points. Do you have any su...
by kodiologist
Tue Sep 02, 2025 9:38 am America/New_York
Forum: Home
Question: MYD13A3_061 is missing a file for January 2024 at the tile h08v04
Replies: 2

MYD13A3_061 is missing a file for January 2024 at the tile h08v04

The full product name is "MODIS/Aqua Vegetation Indices Monthly L3 Global 1km SIN Grid V061". Consider the search https://search.earthdata.nasa.gov/search/granules?p=C2327957988-LPCLOUD&&pg[0][qt]=2023-12-01T00%3A00%3A00.000Z%2C2024-02-01T23%3A59%3A59.999Z&pg[0][id]=*h08v04* I ...