Search found 272 matches

by LAADS_UserServices_M
Tue Oct 03, 2023 7:36 am America/New_York
Forum: Questions/Comments
Question: Scaling of Cloud Top Temperature product of MODIS Aqua level 2
Replies: 2

Re: Scaling of Cloud Top Temperature product of MODIS Aqua level 2

The values you listed are correct. The "add_offset" value is a negative value: units = K scale_factor = 0.009999999776482582 add_offset = -15000.0 The following equation should be used to get to the real value: value = scale_factor * ( stored_value - add_offset ) so for a stored integer va...
by LAADS_UserServices_M
Thu Sep 28, 2023 10:24 am America/New_York
Forum: Questions/Comments
Question: Georeference Suomi-NPP NRT HDF to GeoTIFF
Replies: 1

Re: Georeference Suomi-NPP NRT HDF to GeoTIFF

Somehow missed your post. You may want to explore tools available from LAADS DAAC. The information about these tools can be found here: https://ladsweb.modaps.eosdis.nasa.gov/tools-and-services/#ldope The User Guide for the Reproject tool has an example of first reprojection of the MODIS/VIIRS data ...
by LAADS_UserServices_M
Mon Sep 11, 2023 12:42 pm America/New_York
Forum: Questions/Comments
Question: NASA's Black Marble monthly data: Reprojection isn't accurate
Replies: 1

Re: NASA's Black Marble monthly data: Reprojection isn't accurate

Hi Nikolaos, Yes, it appears that the issue lies in how you're calculating the spatial extent. This is how you calculate the bounding box using the horizontal (h) and vertical(v) time number – WestBoundCoord = (10*HorizontalTileNumber) - 180 NorthBoundCoord = 90-(10*VerticalTileNumber) EastBoundCoor...
by LAADS_UserServices_M
Mon Sep 11, 2023 11:10 am America/New_York
Forum: Questions/Comments
Question: VIIRS NOAA21
Replies: 1

Re: VIIRS NOAA21

We are hoping to have NOAA21 VIIRS data available from LAADS by the end of the year. We will post a product release notice on ladsweb (https://ladsweb.modaps.eosdis.nasa.gov/alerts-and-issues/) page once the data are available for download.
by LAADS_UserServices_M
Mon Sep 11, 2023 10:38 am America/New_York
Forum: Questions/Comments
Question: Downloading Individual MODIS bands
Replies: 1

Re: Downloading Individual MODIS bands

You can extract each layer by performing parameter subsetting using LAADS Post-Processing tools from LAADS “Find Data” Interface: https://ladsweb.modaps.eosdis.nasa.gov/search/ If you are new to ladsweb, you can consult the post processing tutorial at: https://ladsweb.modaps.eosdis.nasa.gov/learn/ho...
by LAADS_UserServices_M
Mon Sep 11, 2023 10:06 am America/New_York
Forum: Questions/Comments
Question: VIIRS Spectral AOT Access
Replies: 1

Re: VIIRS Spectral AOT Access

All SDSs available in each level 2 and level 3 product are listed at:
https://ladsweb.modaps.eosdis.nasa.gov/missions-and-measurements/science-domain/aerosol/#viirs
by LAADS_UserServices_M
Wed Sep 06, 2023 9:20 am America/New_York
Forum: Questions/Comments
Question: Re-griding the MODIS Aqua L2 cloud product.
Replies: 1

Re: Re-griding the MODIS Aqua L2 cloud product.

Dear Aakash Kumar: To be more accurate, the user can use the 1-km “Latitude” and “Longitude” (2030x1354) from MYD03, to identify how many 1-km cloud microphysical properties pixels fall within 5-km cloud top properties pixel. For example, assume “number_of_1km” pixels fall in a 5-km pixel, they can ...
by LAADS_UserServices_M
Thu Aug 24, 2023 1:22 pm America/New_York
Forum: Questions/Comments
Question: MYD021KM data missing in 2009/11/25
Replies: 3

Re: MYD021KM data missing in 2009/11/25

Because science team set more stricter QA rules for Collection 6 on ward.
by LAADS_UserServices_M
Tue Aug 22, 2023 11:26 am America/New_York
Forum: Questions/Comments
Question: MYD021KM data missing in 2009/11/25
Replies: 3

Re: MYD021KM data missing in 2009/11/25

This is a data outage period which is documented at data outage page:
https://modaps.modaps.eosdis.nasa.gov/services/production/outages_aqua.html
by LAADS_UserServices_M
Tue Aug 22, 2023 7:18 am America/New_York
Forum: Questions/Comments
Question: Fine mode fraction aerosol over ocean in MODIS SDS
Replies: 3

Re: Fine mode fraction aerosol over ocean in MODIS SDS

In MODIS collection 6.1 datasets (e.g. MOD04_L2), there are four variables relevant to fine model: 1. Optical_Depth_Ratio_Small_Ocean_0.55micron: is the fraction of AOT (at 0.55 micron) contributed by fine mode for average solution. 2. Optical_Depth_Small_Average_Ocean: is the retrieved optical thic...