HAPEX HAPEX SAHEL Information System
A joint project between CESBIO, ORSTOM and CNES

Standard Dataset Documentation

This document is adaptated from D. E. Strebel, D. Landis, J. A. Newcomer, J. DeCampo, and B. W. Meeson - Collected Data of the First ISLSCP Field Experiment, Prototype volume. Published on CDROM by NASA, 1991.

Items marked by a (+) are mandatory, and items marked by a (-) will be filled by the HAPEX SAHEL Information System Team.


1.1. Data Set Identification (+)

Title or name for the data set, generally a short descriptive phrase, e.g. AVHRR LAC1, LEVEL 1 DATA.

1.2. HAPEX 2 SAHEL Data Base Table Name (-).

HAPEX 2 SAHEL data base in which the data may be found.

1.3. CD-ROM File Name (-).

Name (or class of names) of the file(s) on the HAPEX 2 SAHEL CD-ROM in which the data may be found.

1.4. Revision Date Of This Document (+).

The last date that this document was edited.


2.1. Investigator(s) Name And Title (+).

Identify the Principal Investigator for this data set, including general affiliation, if applicable.

2.2. Title of Investigation. (+)

The title of the study for which the data set was collected.

2.3. Contacts (For Data Production Information) (+).

The persons most knowledgeable about the actual collection and processing of the data sets. In many cases this will be a person (or persons), other than Principal Investigator, who prepared the data for submission to HAPEX 2 SAHEL and is sufficiently knowledgeable about the data to answer technical questions about it. When the Primary investigator is a primary contact, full address information should be given here, not in item (2.1). Item 2.3.1 through 2.3.4 should be presented in a table format, with the information for each contact person provided in a separate column.

|              |      Contact 1       |      Contact 2      |    Contact 3     |
|2.3.1 Name    |                      |                     |                  |
|2.3.2 Address |                      |                     |                  |
|      Country |                      |                     |                  |
|2.3.3 Tel.    |                      |                     |                  |
|2.3.4 Email   |                      |                     |                  |
|2.3.5 Fax.    |                      |                     |                  |

2.4. Requested Form of Acknowledgement.

How the Principal Investigator would like to be acknowledged when this data set is referenced or used by another investigator.


3.1. Objective/Purpose.

Why the study was undertaken, and what the Principal investigator hoped to achieve by conducting it.

3.2. Summary of Parameters.

A summary of the phenomena which are being studied, and their parameters. Note that a full description will be given in item 8.

3.3. Discussion.

A few introductory paragraphs which describe the Experiment, the nature of the data, the quality of the data, etc.


Theoretical basis for the way in which the measurements were made (e.g. special procedures, characteristics of the instrument, etc.).


5.1. Instrument Description.

A listing of the instrumentation and the characteristics of the instrumentation.

5.1.1. Platform (Satellite, Aircraft, Ground, Person...).

What the instrument is mounted on.

5.1.2. Mission Objectives.

The reason why the mission was undertaken. (Mission here refers, in general, to the general purpose of operational or research satellites and aircraft.. The particular study objectives are in item 3.1.)

5.1.3. Key Variables.

The primary quantities being measured (e.g. surface radiance).

5.1.4. Principles of Operation.

Fundamental scientific basis for the way the instrument operates. This is a summary; where a full development is required, it should be in item 4.

5.1.5. Instrument Measurement Geometry.

Describe the sensor location, orientation, and any other parameters which affect the collection or analysis of data (e.g. field of view, optical characteristics, height, etc. )

5.1.6. Manufacturer of Instrument.

name, address, and telephone number of the company which produced the instrument. If the measuring device was built by the investigator, or specially customised by someone, please specify.

5.2. Calibration.

Describe how the measurements made by the device(s) are calibrated with known standards. Specific details should be given in the subparagraphs below.

5.2.1. Specifications.

Record any specifications which affect the calibration of the device, its operations, or the analysis of the data collected with it. Tolerance.

Describe the acceptable range of inputs and the precision of the output values.

5.2.2. Frequency of Calibration.

Indicate how often the instrument is measured against a standard. Also indicates any other routine procedures required to maintain calibration or detect miscalibrations. Describes also the actual practice with this device.

5.2.3. Other Calibration Information.

Give factory calibration coefficients, informations about independent calibrations, history of modifications, etc.


6.1. Data Acquisition Methods.

Describe the procedures for acquiring this data in sufficient detail so that someone else with similar equipment could duplicate your measurements.

6.2. Spatial Characteristics (+).

6.2.1. Spatial Coverage (+).

Indicate the total area covered by each measurement or set of measurements. Also give enough information to locate the geographic position of the measurement with suitable precision.

6.2.2. Spatial Resolution (+).

The degree to which the terrain may be resolved into constituent or elementary parts (e.g. The dimension of each image pixel.).

6.3. Temporal Characteristics (+).

Describe the actual temporal resolution and coverage of the data collected.

6.3.1. Temporal Coverage (+).

The period(s) of time during which data was collected more or less continuously (e.g. an Intensive Obervating Period or a Golden Day).

6.3.2. Temporal Resolution (+).

Describe the optimum and typical intervals between measurements during the periods in 6.3.1 (e.g. hourly, daily).


7.1. Field Notes.

Use this section to record observations made during actual data collection, which could bear on the analysis of the data, e.g. condition of site, peculiar procedures or operations, the presence of U.F.O's or camel patties, etc.


8.1. Table Definition With Comments (-).

A annotated description of the HAPEX 2 SAHEL data base table.

8.2. Type of Data (+).

This section should describe the data submitted, with items 8.2.1 through 8.2.5 (below) being represented as columns in a table.

| 8.2.1                                  |               |          |           |
|Parameter/Variable Name                 |               |          |           |
|    |         8.2.2                     |     8.2.3     |  8.2.4   |  8.2.5    |
|    |Parameter/Variable Description     |Range          |Units     |Source     |
|                                        |               |          |           |
|    |                                   |min =          |          |           |
|    |                                   |max =          |          |           |
|    |                                   |missing =      |          |           |

8.3. Sample Database Data Record (+).

One or more sample records from a data file should be recorded here.

8.4. Data Format (-).

Indicate the format specifier for the data (as it will appear on the CD-ROM).


9.1. Formulas.

List any formulae required in processing the data.

9.1.1. Derivation Techniques/Algorithms.

Describe any special techniques or algorithms used.

9.2. Data Processing Sequence.

9.2.1. Processing Steps and Data Sets.

Indicates the sequence of processing steps.

9.2.2. Processing Changes.

For long term, repetitive, or revised data sets; give an history of changes in the processing sequence.

9.3. Calculations.

9.3.1. Special Corrections/Adjustments.

9.4. Graphs and Plots.


10.1. Sources of Error.

Describe what factors of the instrument or environment may introduce errors in the observations.

10.2. Quality Assessment.

10.2.1. Data Validation by Source.

Describe all efforts to validate the data by the submitter.

10.2.2. Confidence Level/Accuracy Judgement.

Subjective discussion of data quality.

10.2.3. Measurement Error for Parameters and Variables.

Quantitative error estimates.

10.2.4. Additional Quality Assessment Applied.


11.1. Known Problems With The Data.

List known problems and discrepancies in the data set.

11.2. Usage Guidance.

Place any "Truth in Analysis" warning here.

11.3. Other Relevant Information.

Use those section for any other information about the study (such as humorous anecdotes, lame excuses, abject apologies, miracles, etc.).


12.1. Satellite/Instrument/Data Processing Documentation.

List any published documentation relevant to the data collected, such as manufacturer's instruction manuals, government technical manuals, use's guide, etc.

12.2. Journal Articles and Study Reports.

List technical reports and scientific publications which concern the methods, instruments, or data described in this document. Publications by the Principal Investigator or investigating group which would help a reader understand or analyse the data are particularly important.

12.3. Archive/DBMS Usage Documentation.


13.1. Contacts for Archive/Data Access Information (-).

13.2. Archive Identification (-).

13.3. Procedures for Obtaining Data (-).

13.4. PLDS Status/Plans (-).


14.1. Tape Products.

14.2. Film Products.

14.3. Other Products.




1.1. Investigator(s) Name And Title (+).

1.2. Contacts (+).

1.3. Revision Date of This Documentation (+).


Give here the data set that used these ground stations.


For each station give usual name, personal identification such as code number, longitude, latitude, altitude being represented as column in a table (see below).

3.1. Station usual name (+).

Give here the usual or traditional name of the station such as the name of the nearest village.

3.2. Station code (+).

Give here the station code used in your data set.

3.3. Latitude (+).

Give the latitude in degrees, minutes, seconds, and hundredth of seconds (e.g. 12013'14,15").

3.4. Longitude (+).

Give the longitude in degrees, minutes, seconds, and hundredth of seconds (e.g. 02003'04,05").

3.5. Altitude (+).

Give the elevation in meters.

3.6. Super Site and WAB.

Give the acronyms of Super Site and Wind Area Blob the station belongs to ( CS Central Site, NS Northern Site, SS Southern Site, CS Central Site, CWS Central West Site).

|2.1               | 2.2               |  2.3       | 2.4       | 2.5      | 2.6|
Station usual name | PI's Station code |  Latitude  | Longitude | Altitude | SS |
|                  |                   |            |           |          |    -
|                  |                   |            |           |          |    |


Describe the procedures for acquiring this data in sufficient detail so that someone else with similar equipment could duplicate your measurements.

5. ERRORS (+).

Quantitative error estimates.


Give for a particular station or the whole station relevant comments such as vegetation, road, snow, etc.

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