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SPADEX-1: Earth Viewing Data for 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 the “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

Science products are available to download with a Single Sign On on MOSDAC. Click Here to access the data

 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]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

NA 

Known problems with data 

Since bands have temporal shift and clouds are moving features, clouds may appear slightly mis-registered.

 

File Naming Convention

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

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

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

  •  'P#' stands for P1/P2.

  • 'SAT' stands for satellite name, ex: SD2

  • 'ORBNO' corresponds to the orbit number, ex: 04070

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

  • ‘YY’ is Year Integer Value.

  • ‘DDD’ is Julian Day Integer Value.

  • ‘HH’ is Hour Integer Value.

  • ‘MM’ is Minutes Integer Value.

  • ‘SS’ is Seconds Integer Value.

  • ‘MSE’ is Milliseconds Integer value

 

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

  • All the data files are in GeoTiff format.

 

MetaData 

Sr. No Core Metadata Elements Definition
1 Metadata language English
2 Metadata Contact MOSDAC
3 Metadata date

April, 2026
4 Data Lineage or Quality

Band to Band Registered geo corrected product in NCC form
5 Title

Miniature Multispectral camera (MMX) band-to-band registered data from SPADEX mission
6 Abstract

The data products will be used for natural resource study
7 Dataset Contact

K.Suresh, PSPD/PMPG/SIPA SAC (ISRO), Ahmedabad-380015, India. Ph:+91 79 2691 4710.Email:ksuresh@sac.isro.gov.in

 

Abdullah Suhail Ayyub Zinjani, PSPD/PMPG/SIPA SAC (ISRO), Ahmedabad-380015, India. Ph:+91 79 2691 4763.Email: abdul@sac.isro.gov.in
8 Update Frequency

One time
9 Access Rights or Restriction Open Access
10 Spatial Resolution

25.2 m
11 Language English
12 Topic Category

Band to Band Registered geo corrected product as Natural Color Composite(NCC) using MMX payload data.
13 Keywords

MMX,BBR,NCC,SPADEX.
14 Date or period

May 2025 – Apr 2026
15 Responsible Party

PSPD/PMPG/SIPA 
16 Organization Space Applications Centre (ISRO), Ahmedabad, India
16a Org. role

Data processing for MMX payload
16b Individual name

Abdullah Suhail Ayyub Zinjani
16c Position

Scientist/Engineer
16d Vertical Extent (minimumValue, maximumValue, unitOfMeasure, vertical datum) NA
17 Geographic Extent

Latitude Range: -90 to 90 deg

Longitude Range: 0 to 360 deg
18 Geographic name, geographic Identifier

Global Data 
19 Bounding box

Lat_min: 40S, Lat_max: 40N Lon_min: 0E, Lon_max: 180E
20 Temporal Extent

Scene wise
21 Access Rights or Restrictions Open Access
22 Distribution Information

Online download of data files in GeoTiff format
23 Processing Level Level 2 
24 Reference System Datum: WGS84

 

 

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