SPADEX-1: Earth Viewing Data from MMX

SPADEX (Space-craft Docking Experiment) is based on the low docking concept using two small satellites. Docking refers to engaging and securing the two spacecraft together by a docking mechanism when the approaching spacecraft called the SDX01 flies directly into another spacecraft called SDX02 in a controlled manner.

 The primary objectives of SPADEX experiment are to:

• To Develop and demonstrate the technology needed for rendezvous and docking, using two small satellites.

   The secondary mission objectives are to:

• Demonstrate the controllability of SDX01 & SDX02 in the docked condition

Data Access

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Data Version

Version 1.0 (beta).

Data Sources

NA

Data Citation

NA

Processing Steps

1. Data decoding by extraction of raw image bands (Blue, Red and Green) from payload data files.

2. Radiometric correction for all bands using Look Up Table(LUT) application to convert raw image bands to radio-metrically corrected bands.

3. Geometric Correction for removing geometric distortions in image and generating geo corrected products in WGS-84 datum.

4. Band-to-Band registration for producing geo corrected BBR product in Natural Color Composite(NCC) format i.e. RGB bands.

References

1. [1] Lowe, David G. "Distinctive image features from scale-invariant keypoints." International journal of computer vision 60.2 (2004): 91-110.

Derivation Techniques and Algorithm

Band-to-Band registration employs Scale Invariant Feature Transform (SIFT) for detecting keypoints across separate bands that are used for image registration. SIFT has been described in detail in [1].

Limitations

Known problems with data

File Naming Convention

The typical file name ‘PLDXXSTNP#SATORBNOVCAPIdYYDDDHHMMSSMSE_Vm_n _BBR_geo_final.tif’,Ex:MMXXXMU2P1SD20407001NNNN25264054328469_V1_1_BBR_geo_final.tif where:

1.  'PLD' stands for Payload name, ex: MMX.

2.  'STN' stands for Station-id, ex: MU2.

3.  'P#' stands for P1/P2.

4. 'SAT' stands for satellite name, ex: SD2

5. 'ORBNO' corresponds to the orbit number, ex: 04070

6. ' YYDDDHHMMSSMSE ' corresponds to the file closing time after data is received.

7. ‘YY’ is Year Integer Value.

8. ‘DDD’ is Julian Day Integer Value.

9. ‘HH’ is Hour Integer Value.

10. ‘MM’ is Minutes Integer Value.

11. ‘SS’ is Seconds Integer Value.

12. ‘MSE’ is Milliseconds Integer value

13. ‘m’ signifies major version number while ‘n ‘signifies minor version number.

14. All the data files are in GeoTiff format.

MetaData