MODIS/Aqua CLD Mask Spect. Results 250m and 1km 5-Min L2 Wide Swath Subset along CloudSat V2 (MAC35S1) at GES DISCEntry ID: GES_DISC_MAC35S1_v2
Abstract: This is the wide-swath MODIS/Aqua subset along CloudSat field of view track. The goal of the wide-swath subset is to select and return MODIS data that are within +-100 km across the CloudSat track. I.e. the resultant MODIS subset swath is sought to be about 200 km cross-track. Geolocations in the original product, however, are subsampled at 5-km, and thus the crosss-track width of the subset ... geolocations is 41 pixels. The subset Cloud Mask has 201 pixels across-track. However, some of the Cloud Mask information is at bit level, thus allowing storing actually 250-m information in seemingly 1-km pixels. This is achieved by reserving 2 bytes (the last two out of six) of every 1-km pixel as 16 yes/no-cloud bits. Each one of these 16 bits flags a corresponding 250-m tile inside the 1-km pixel. Their state is described in the local attributes to the Cloud_Mask HDF data set, and accordingly must be interprated as 0=YES, 1=NO. Thus the effective cross-track width, for these two bytes only, is 804 tiles of 250-m denomination.
Along-track, all MODIS pixels from the original product are preserved.
In the standard product, the MODIS level-2 cloud mask product is a global product generated for both daytime & nighttime conditions at 1-km spatial resolution (at nadir) and for daytime at 250-m resolution. The algorithm employs a series of visible and infrared threshold and consistency tests to specify confidence levels that an unobstructed view of the Earth's surface is observed. An indication of shadows affecting the scene is also provided. The 250-m cloud mask flags are based on the visible channel data only. Radiometrically accurate radiances are required, so holes in the cloud mask will appear wherever the input radiances are incomplete or of poor quality. The shortname for this Level-2 MODIS cloud mask product is MYD35_L2 and the principal investigator for this product is MODIS scientist Dr. Paul Menzel (firstname.lastname@example.org).
"Two day repeat observations with a repeat orbit pattern every 16 days. The
locales where the ascending and descending modes are close or intersect can
have two observations per day."
(The shortname for this product is MAC35S1).
For more data set information:
A-Train Data Depot homepage: http://disc.sci.gsfc.nasa.gov/atdd/
MODIS Science Team homepage: http://modis.gsfc.nasa.gov/data/dataprod/
MODIS-Atmosphere homepage: http://modis-atmos.gsfc.nasa.gov/
Data Set Citation
Dataset Originator/Creator: GES DISC/MODIS
Dataset Title: MODIS/Aqua CLD Mask Spect. Results 250m and 1km 5-Min L2 Wide Swath Subset along CloudSat
Dataset Series Name: MAC35S1
Dataset Release Date: October 2006
Dataset Release Place: Greenbelt, MD, USA
Dataset Publisher: Goddard Earth Science Data and Information Services Center (GES DISC)
Issue Identification: MAC35S1_2
Data Presentation Form: Digital Science DataOnline Resource: http://disc.gsfc.nasa.gov/datacollection/MAC35S1_v2.shtml
Start Date: 2000-03-01
Latitude Resolution: 1 km at nadir
Longitude Resolution: 1 km at nadir
Horizontal Resolution Range: 1 km - < 10 km or approximately .01 degree - < .09 degree
Temporal Resolution: Two day repeat observations with a repeat orbit pattern every 16 days.
Temporal Resolution Range: Daily - < Weekly
ISO Topic Category
Quality The following web site contains quality information on the MYD06_L2 product:
Access Constraints None
Use Constraints None
Data Set Progress
Distribution Media: Online (FTP)
Distribution Size: 1.49MB
Distribution Format: HDF
Role: DIF AUTHOR
Role: TECHNICAL CONTACT
Email: gsfc-help-disc at lists.nasa.gov
Goddard Earth Sciences Data and Information Services Center Code 610.2 NASA Goddard Space Flight Center
Province or State: MD
Postal Code: 20771
Extended Metadata Properties
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Creation and Review Dates
DIF Creation Date: 2006-09-22
Last DIF Revision Date: 2014-05-05
Future DIF Review Date: 2015-05-01