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Record Search Query: [Service_Provider: Short_Name='NASA/GSFC/SED/ESD/GCDC/GESDISC']

map Time Smoothing for Giovanni-3
 Entry ID: G3_mapTimeSmoothing

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Summary
Abstract: The mapTimeSmooth service for G3 takes a series of grids as an input and
computes a series of smoothed grids as the output. The output values are the
result of applying a simple boxcar filter to the series of input grids, where
the units of the filtering dimension are individual files.

Input parameters:
Geophysical variables

Output ...
Smoothed variable array

Output Parameters:
Same as input parameters

File Type:
Input and output files are in HDF4.

Sub-definitions:

  • Grid: two-dimensional data structure (an array of measurements represented on
    an area map)

  • Longitude: horizontal dimension of grid

  • Latitude: vertical dimension of grid

  • Pixel: individual grid data element



Service Description:


  1. Input files are treated in groups, of size equal to the smoothing window, and
    the average grid is computed for that group.

  2. Output the average grids as a three-dimensional grid in the
    output file.

  3. The number of output grids n_output is:
    n_output = n_input - (smoothingWindow - 1)

    where n_input is the number of input grids, and smoothingWindow
    is the number of grids used in each smoothing interval.


Algorithm Details
Essentially this service is performed by repeated applications of the map Time
Average service. since the filter window moves, there is usually more than one
output grid produced.

he averaging service takes care of the required subsetting and weighting,
while the smoothing service merely acts as a controlling element, passing
the sets of files for each smoothing window to the averaging service, along
with the required weighting and geographic subsetting parameters.

The averaging service also handles the details of collapsing three-
dimensional input arrays into two-dimensional arrays.

Caveats/Warnings:


Origin/Software:
Implemented in IDL

User Options

  • Weighting using auxiliary grids which contain the number of measurements
    used to generate the input grids.

  • Users must specify a width for the filter window (the default value is 3,
    which represents smoothing using three files at a time).



Other information:
This document describes only the mathematical approach used in the computation. View entire text
Related URL
Link: GET SERVICE
Service Citation
URL: http://giovanni.gsfc.nasa.gov
Parent SERF
This data service description is a member of a collection. The collection is described in
Giovanni
Service Keywords
DATA ANALYSIS AND VISUALIZATION >VISUALIZATION/IMAGE PROCESSING Parameter Definition

Science Keywords
ATMOSPHERE >AEROSOLS Parameter Definition
ATMOSPHERE >ATMOSPHERIC CHEMISTRY Parameter Definition
View entire list
ISO Topic Category
CLIMATOLOGY/METEOROLOGY/ATMOSPHERE
ENVIRONMENT
OCEANS
Project
EOSDIS >Earth Observing System Data Information System Supplemental Info
ESIP >Earth Science Information Partners Program Supplemental Info
GIOVANNI-3 >GES-DISC DAAC Interactive Online Visualization and ANalysis Infrastructure Supplemental Info
Quality Data quality is dependent on input data sets and processing.
Access Constraints There are no access constraints to data in Giovanni-3.
Use Constraints Use of the data and the Giovanni system should be acknowledged in published works and presentations.
Service Provider
NASA/GSFC/SED/ESD/GCDC/GESDISC > Goddard Earth Sciences Data and Information Services Center (formerly Goddard DAAC), Global Change Data Center, Earth Sciences Division, Science and Exploration Directorate, Goddard Space Flight Center, NASA Supplemental Info
Service Organization URL: http://disc.gsfc.nasa.gov/

Service Provider Personnel
Name: STEVE KEMPLER
Phone: 301-614-5473
Phone: 1-877-422-1222
Fax: 301-614-5268
Email: gsfc-help-disc at lists.nasa.gov
Email: Steven.J.Kempler at nasa.gov
Contact Address:
Goddard DAAC Helpdesk
GES DAAC
Global Change Data Center, Code 610.2
NASA Goddard Space Flight Center
City: Greenbelt
Province or State: MD
Postal Code: 20771
Country: USA
Personnel
JAMES G. ACKER
Role: SERF AUTHOR
Phone: 301-614-5435
Fax: 301-614-5268
Email: James.G.Acker.1 at gsfc.nasa.gov
Contact Address:
NASA Goddard Space Flight Center
Code 610.2
City: Greenbelt
Province or State: MD
Postal Code: 20771
Country: USA
Creation and Review Dates
SERF Creation Date: 2006-10-27
SERF Last Revision Date: 2009-05-01
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