MODIS/Terra Clear Radiance Statistics Indexed to Global Grid 5-Min L2 Swath 10km V006

Metadata Updated: August 9, 2018

The MODIS/Terra Clear Radiance Statistics Indexed to Global Grid 5-Min L2 Swath 10km (MODCSR_G) provides a variety of, statistical measures that characterize observed top-of-atmosphere clear sky radiances at a 25-km spatial resolution. Clear radiances are collected for all earth scenes and separated by day and night. The following statistical quantities are included:

total number of observations number of clear observations sum of clear values minimum clear value maximum clear value sum of viewing zenith angles sum of clear-sky values squared sum of observed clear minus calculated clear values (for clear-sky bias calc.) sum of observed minus calculated clear values squared

In addition, total counts (clear and cloudy radiances) are separated into land and water and day and night categories for better target discrimination.

The MODCSR_G serves as input to the downstream Level 3 aggregation processes that culminate with the production of the 1-degree Zonal Bias Product (MODCSR_B) used as input to PGE06 (MODIS Cloud Product). MODCSR_G data are collected for bands 1-7 and 17-36 for all but the last two statistics. Calculated clear-sky radiances are produced for bands 20, 22-25, and 27-36 and subtracted from observed values. Differences in bands 31 and 33-36 are summed and used to create the clear-sky biases used in generating the PGE06 cloud top pressure field. Numbers of observations from land vs. water are also kept for each 25-km region. Biases are used to quantify the difference between instrument observed radiances and a calculated radiance. This difference is especially important for the cloud top properties retrieval which utilizes an atmospheric transmittance model as a means of calculating radiances in different layers of the atmosphere and matching that to observations.

The biases contained in MODCSR_G are the difference between the calculated radiance and the observed radiance for all clear-sky grid cells which fall within the given granule. Several different ways of determining the bias were studied, including an attempt to interpolate observed biases across grid boxes where no clear sky scenes could be found for a given day. This procedure worked well for relatively cloud free regions, but large areas of cloud cover produced unrealistic interpolated values. It was finally determined that compositing eight days of clear sky radiance values would work logistically and produce scientifically robust results. The MODCSR_G files are in Hierarchical Data Format (HDF).

Access & Use Information

Public: This dataset is intended for public access and use. License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

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Metadata Created Date August 9, 2018
Metadata Updated Date August 9, 2018

Metadata Source

Harvested from NASA Data.json

Additional Metadata

Resource Type Dataset
Metadata Created Date August 9, 2018
Metadata Updated Date August 9, 2018
Publisher Not provided
Unique Identifier C203234499-LAADS
Maintainer Email
Public Access Level public
Bureau Code 026:00
Metadata Context
Schema Version
Catalog Describedby
Harvest Object Id e56d2ab5-f843-431e-8a05-12984c0a096e
Harvest Source Id 39e4ad2a-47ca-4507-8258-852babd0fd99
Harvest Source Title NASA Data.json
Data First Published 2015-01-01T00:00:00.000Z
Language en-US
Metadata Type geospatial
Data Last Modified 2018-04-04T00:00:00Z
Program Code 026:001
Publisher Hierarchy U.S. Government > National Aeronautics and Space Administration > Not provided
Related Documents,,
Source Datajson Identifier True
Source Hash eb0b036348ff54d8880f8bc3069648275d47a5f2
Source Schema Version 1.1
Spatial -180.0 -90.0 180.0 90.0
Temporal 2000-02-24T00:00:00Z/2018-04-04T00:00:00Z
Category TERRA, geospatial

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