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Measurement of Air Pollution from Satellites (MAPS) Second by Second Langley DAAC Data Set Document

 Image representing the MAPS project.

Summary:

This document provides information for the following three data sets:

Table of Contents:

  1. Data Set Overview
  2. Investigator(s)
  3. Theory of Measurements
  4. Equipment
  5. Data Acquisition Methods
  6. Observations
  7. Data Description
  8. Data Organization
  9. Data Manipulations
  10. Errors
  11. Notes
  12. Application of the Data Set
  13. Future Modifications and Plans
  14. Software
  15. Data Access
  16. Output Products and Availability
  17. References
  18. Glossary of Terms
  19. List of Acronyms
  20. Document Information

1. Data Set Overview:

Data Set Identification:

MAPS_OSTA3_COSEC_HDF: Measurement of Air Pollution from Satellites (MAPS) Office of Space and Terrestrial Applications - 3 (OSTA3) Carbon Monoxide Second by Second data in Hierarchical Data Format (HDF) (MAPS_OSTA3_COSEC_HDF)
MAPS_SRL1_COSEC_HDF: Measurement of Air Pollution from Satellites (MAPS) Space Radar Laboratory - 1 (SRL1) Carbon Monoxide Second by Second data in Hierarchical Data Format (HDF) (MAPS_SRL1_COSEC_HDF)
MAPS_SRL2_COSEC_HDF: Measurement of Air Pollution from Satellites (MAPS) Space Radar Laboratory - 2 (SRL2) Carbon Monoxide Second by Second data in Hierarchical Data Format (HDF) (MAPS_SRL2_COSEC_HDF)

Data Set Introduction:

...

Objective/Purpose:

...

Summary of Parameters:

Carbon Monoxide

Discussion:

...

Related Data Sets:

...

2. Investigator(s):

Investigator(s) Name and Title:

Dr. Vickie S. Connors

Title of Investigation:

Measurement of Air Pollution from Satellites, MAPS

Contact Information:

Dr. Vickie S. Connors
NASA Langley Research Center
Atmospheric Science Division
Mail Stop 401A
Hampton, VA 23681-0001
USA
Telephone: (757) 864-5849
E-mail: v.s.connors@larc.nasa.gov

3. Theory of Measurements:

...

4. Equipment:

Sensor/Instrument Description:

Collection Environment:

...

Source/Platform:

MAPS_OSTA3_COSEC_HDFSTS-41-G
MAPS_SRL1_COSEC_HDFSTS-59
MAPS_SRL2_COSEC_HDFSTS-68

Source/Platform Mission Objectives:

...

Key Variables:

Carbon Monoxide

Principles of Operation:

...

Sensor/Instrument Measurement Geometry:

GFC RADIOMETER

Manufacturer of Sensor/Instrument:

...

Calibration:

Specifications:

...

Tolerance:

...

Frequency of Calibration:

...

Other Calibration Information:

...

5. Data Acquisition Methods:

...

6. Observations:

Data Notes:

...

Field Notes:

...

7. Data Description:

Spatial Characteristics:

Spatial Coverage:

Data Set Name
 Min Lat
 Max Lat
 Min Lon
 Max Lon
MAPS_OSTA3_COSEC_HDF -70.00 70.00 -180.00 180.00
MAPS_SRL1_COSEC_HDF -70.00 70.00 -180.00 180.00
MAPS_SRL2_COSEC_HDF -70.00 70.00 -180.00 180.00

Spatial Coverage Map:

...

Spatial Resolution:

...

Projection:

...

Grid Description:

...

Temporal Characteristics:

Temporal Coverage:

Data Set Name
 Begin Date
 End Date
MAPS_OSTA3_COSEC_HDF 10/06/1984 10/13/1984
MAPS_SRL1_COSEC_HDF 04/09/1994 04/19/1994
MAPS_SRL2_COSEC_HDF 09/30/1994 10/11/1994

Temporal Coverage Map:

...

Temporal Resolution:

...

Data Characteristics:

Parameter/Variable:

All of the parameters listed below are in each data set granule. However, the ranges vary between data sets and between granules within each data set.

MAPS_OSTA3_COSEC_HDF
Parameter Name                 Min Value        Max Value       Units
---------------------------------------------------------------------------------
Day                             280.00          280.00          Julian Day
Time                              0.00        43199.00          GMT in Seconds
Latitude                        -57.15           57.15          Degrees
Longitude                      -180.00          180.00          Degrees
V CHANNEL                        -4.99            0.84          Voltage
DV CHANNEL                       -1.09            4.27          Voltage
DVP CHANNEL                      -0.82            4.70          Voltage
N                                -0.00000002      0.000051      Radiance (w/cm2/steradian)
DN                               -0.00000005      0.000002      Radiance (w/cm2/steradian)
DNP                              -0.00000004      0.000002      Radiance (w/cm2/steradian)
CO                                0.00            0.000003      Parts Per Billion by Volume
N2O                               0.00            0.000012      Parts Per Billion by Volume
TBB1                            313.14          313.47          Degrees Kelvin
TBB2                            279.07          280.22          Degrees Kelvin
TERTYPE                           0.0             9.0           Terrain Type Status
TERHGHT                       -7300.00         5578.00          Height from Sea Level
DN500mb                         231.15          273.80          Degrees Kelvin
DNP500mb                        231.15          273.80          Degrees Kelvin
ATTITUDE                          0.00            1.00          Attitude Status
DAYNGT                            0.00            1.00          Day/Night Status
CDST                             -9.00            9.00          Processing Status
STWD                             25.00           58.00          Instrument Status


MAPS_SRL1_COSEC_HDF
Parameter Name                 Min Value        Max Value           Units
---------------------------------------------------------------------------------
Day                             280.00          280.00          Julian Day
Time                              0.00        43199.00          GMT in Seconds
Latitude                        -57.15           57.15          Degrees
Longitude                      -180.00          180.00          Degrees
V CHANNEL                        -5.00            0.79          Voltage
DV CHANNEL                       -0.84            5.12          Voltage
DVP CHANNEL                      -0.74            4.92          Voltage
N                                -0.00000005      0.000051      Radiance (w/cm2/steradian)
DN                               -0.00000004      0.000002      Radiance (w/cm2/steradian)
DNP                              -0.00000004      0.000002      Radiance (w/cm2/steradian)
CO                                0.00000002      0.000003      Parts Per Billion by Volume
N2O                               0.00000001      0.000012      Parts Per Billion by Volume
TBB1                            313.14          313.47          Degrees Kelvin
TBB2                            279.07          280.22          Degrees Kelvin
TERTYPE                           0.0             9.0           Terrain Type Status
TERHGHT                       -7000.00         5371.00          Height from Sea Level
DN500mb                         233.40          271.71          Degrees Kelvin
DNP500mb                        233.30          271.71          Degrees Kelvin
ATTITUDE                          0.00            1.00          Attitude Status
DAYNGT                            0.00            1.00          Day/Night Status
CDST                             -9.00            9.00          Processing Status
STWD                              0.00           58.00          Instrument Status


MAPS_SRL2_COSEC_HDF
Parameter Name                 Min Value        Max Value           Units
---------------------------------------------------------------------------------
Day                             274.00          274.00          Julian Day
Time                              0.00        43199.00          GMT in Seconds
Latitude                        -57.15           57.15          Degrees
Longitude                      -180.00          180.00          Degrees
V CHANNEL                        -5.00            0.78          Voltage
DV CHANNEL                       -0.80            3.89          Voltage
DVP CHANNEL                      -0.75            4.16          Voltage
N                                -0.00000004      0.000051      Radiance (w/cm2/steradian)
DN                               -0.00000004      0.000001      Radiance (w/cm2/steradian)
DNP                              -0.00000004      0.000002      Radiance (w/cm2/steradian)
CO                                0.000000028     0.000003      Parts Per Billion by Volume
N2O                               0.00000001      0.000013      Parts Per Billion by Volume
TBB1                            313.14          313.47          Degrees Kelvin
TBB2                            279.87          280.87          Degrees Kelvin
TERTYPE                           0.0             9.0           Terrain Type Status
TERHGHT                       -7000.00         5371.00          Height from Sea Level
DN500mb                         233.40          271.71          Degrees Kelvin
DNP500mb                        233.30          271.71          Degrees Kelvin
ATTITUDE                          0.00            1.00          Attitude Status
DAYNGT                            0.00            1.00          Day/Night Status
CDST                             -9.00            9.00          Processing Status
STWD                              0.00           58.00          Instrument Status

Variable Description/Definition:

See above.

Unit of Measurement:

See above.

Data Source:

...

Data Range:

See above.

Sample Data Record:

This sample record represents the layout for all three data sets. This example record is from the data granule osta3lv2_1006_06_hdf. There are 3600 data values for every parameter in all granules for all data sets.

Day:
      280.00000      280.00000      280.00000      280.00000      280.00000
      280.00000      280.00000      280.00000      280.00000      280.00000
      280.00000      280.00000      280.00000      280.00000      280.00000
      280.00000      280.00000      280.00000      280.00000      280.00000
      280.00000      280.00000      280.00000      280.00000      280.00000
      ....
Time:
        0.00000        1.00000        2.00000        3.00000        4.00000
        5.00000        6.00000        7.00000        8.00000        9.00000
       10.00000       11.00000       12.00000       13.00000       14.00000
       15.00000       16.00000       17.00000       18.00000       19.00000
       20.00000       21.00000       22.00000       23.00000       24.00000
       ....
Latitude:
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     ....
Longitude:
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
      ....
V CHANNEL:
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
      ....
DV CHANNEL:
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
      ....
DVP CHANNEL:
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
      ....
N:
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
      ....
DN:
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
      ....
DNP:
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
      ....
CO:
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
      ....
N2O:
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
      ....
TBB1:
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
      ....
TBB2:
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
      ....
TERTYPE:
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
      ....
TERHGHT:
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
      ....
DN500mb:
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
      ....
DNP500mb:
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
      ....
ATTITUDE:
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
      ....
DAYNGT:
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
      ....
CDST:
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
      ....
STWD:
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
     -777.77000     -777.77000     -777.77000     -777.77000     -777.77000
      ....

8. Data Organization:

Data Granularity:

A general description of data granularity as it applies to the IMS appears in the EOSDIS Glossary.

Most granules consists of one day of data. There are a few granules that contain a few days of data.

Data Format:

All data granules are in Hieararchical Data Format (HDF).

9. Data Manipulations:

Formulae:

Derivation Techniques and Algorithms:

...

Data Processing Sequence:

Processing Steps:

...

Processing Changes:

There are no plans for reprocessing.

Calculations:

Special Corrections/Adjustments:

...

Calculated Variables:

...

Graphs and Plots:

There is a browse product available for each granule in these data sets.

10. Errors:

Sources of Error:

...

Quality Assessment:

Data Validation by Source:

...

Confidence Level/Accuracy Judgement:

...

Measurement Error for Parameters:

...

Additional Quality Assessments:

...

Data Verification by Data Center:

The Langley DAAC performs an inspection process on this data received by the data producer via ftp. The DAAC checks to see if the transfer of the data completed and were delivered in their entirety. An inspection software was developed by the DAAC to see if the code was able to read every granule. The code also checks to see if every parameter of data falls within the ranges which are included in the granule. This same code extracts the metadata required for ingesting the data into the IMS. If any discrepancies are found, the data producer is contacted. The discrepancies are corrected before the data are archived at the DAAC.

11. Notes:

Limitations of the Data:

...

Known Problems with the Data:

...

Usage Guidance:

...

Any Other Relevant Information about the Study:

...

12. Application of the Data Set:

...

13. Future Modifications and Plans:

...

14. Software:

Software Description:

Sample read software is available for these data sets. This code is written in C. A makefile and a readme file are also available to work with the code and data.

Software Access:

The software can be obtained through the Langley DAAC. Please refer to the contact information below. The software can also be obtained at the same time the user is ordering this data set.

15. Data Access:

Contact Information:

Langley DAAC User and Data Services Office
NASA Langley Research Center
Mail Stop 157D
Hampton, Virginia 23681-2199
USA
Telephone: (757) 864-8656
FAX: (757) 864-8807
E-mail: larc@eos.nasa.gov

Data Center Identification:

Langley DAAC User and Data Services Office
NASA Langley Research Center
Mail Stop 157D
Hampton, Virginia 23681-2199
USA
Telephone: (757) 864-8656
FAX: (757) 864-8807
E-mail: larc@eos.nasa.gov

Procedures for Obtaining Data:

Data, programs for reading the data, and user's guides can be obtained through the EOSDIS Langley DAAC on-line system which will allow users to search through the data inventory and place orders on-line. Users may also order data by letter, telephone, electronic mail (INTERNET), or personal visit.

Langley DAAC User and Data Services Office
NASA Langley Research Center
Mail Stop 157D
Hampton, Virginia 23681-2199
USA
Telephone: (757) 864-8656
FAX: (757) 864-8807
E-mail: larc@eos.nasa.gov
URL: http://eosweb.larc.nasa.gov

The Langley DAAC User and Data Services staff provides technical and operational support for users ordering data. The Langley DAAC Handbook is available in a postscript file through the IMS for users who want detailed information about the Langley DAAC holdings.

Select this text for information on the Langley Information Management System which provides an interface to order data from the Langley DAAC.

Data Center Status/Plans:

The Langley DAAC will continue to archive this data.

16. Output Products and Availability:

There is a browse image for each granule of data archived at the Langley DAAC.

17. References:

...

18. Glossary of Terms:

EOSDIS Glossary.

19. List of Acronyms:

DAAC - Distributed Active Archive Center
EOSDIS - Earth Observing System Data and Information System
ftp - File Transfer Protocol
IMS - Information Management System
LaRC - Langley Research Center
NASA - National Aeronautics and Space Administration
URL - Uniform Resource Locator

EOSDIS Acronyms.

20. Document Information:

Document Revision Date:
October 28, 1996; May 29, 1997; November 24, 1997
Document Review Date:
October 28, 1996
Document ID:
...
Citation:
...
Document Curator:
Langley DAAC User and Data Services Office
Telephone: (757) 864-8656
FAX: (757) 864-8807
E-mail: larc@eos.nasa.gov
Document URL:
http://eosweb.larc.nasa.gov/GUIDE/dataset_documents/base_maps_cosec_dataset.html
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