The DMC3 Constellation

The DMC3 Constellation offers a unique optical Earth Observation capability. The constellation currently consists of three SSTL300-S1 multispectral optical satellites, launched together in July 2015.

The three satellites are in the same 1030 LTAN orbit, phased 120 degrees. This configuration is designed to ensure daily imaging opportunities anywhere on the globe.

Satellites Technical and Orbit Information

Satellite Orbit

Sun-synchronous, altitude of 651km

LTAN

1030hrs

Optical Sensor GSD

Panchromatic: <1m (nadir) | Multispectral (R, G, B, NIR): <4m (nadir)

Swath

23km

MTF at Nyquist

Panchromatic: 10% | Multispectral: 20%

Off-nadir capability

+/- 45 degrees

Projected mission life

10 years

Image file format

GeoTIFF/TIFF

Stereo slew capability

+/- 30 degrees

SNR

All bands > 100:1

Digitisation

10 bits

Compression

JPEG-LS configurable

Safety & Security

128bit AES encryption of all command, telemetry and payload data.

Product Levels

Products Processing
Radiometrically and sensor corrected Georectified Orthorectified Pan-sharpened
Level 1A
Designed for customers who wish to perform their own geometric image processing. The image is supplied radiometrically corrected and geometrically raw along with RCPs for processing. With supplied metadata this can be processed to 23m CE90 at nadir, excluding terrain effects.
Optional
Level 2A
Imagery is ready to orthorectify or use, complete with embedded geographical information. Radiometrically and geometrically corrected, the data is resampled onto the specified map projection, the default being WGS 84. Reference ground control points or height models are not required, relying instead on the data automatically supplied by the satellite. This imagery comes ready processed to 23m CE90 at nadir and is rotated with map north up.
Optional
Level 3A
Your images are aligned and rigorously processed using reference data to ensure that the features in your image and those in the reference data precisely match. This level uses LandSat 8 imagery along with the SRTM 90m digital elevation model to obtain sub-pixel accuracy with respect to that data, correcting for differences in terrain height.
Optional
Ortho
As level 3A, but the images are aligned and rigorously processed using your reference data to ensure precise alignment with your project base layers or other map. Earth-i is able to accept a wide range of ground control points and elevation model formats, and once integrated can use these for all your imaging projects. Geolocation accuracy can be achieved to sub-pixel level with respect to your reference data, meaning accuracies of up to 50cm CE90 to your data.
Optional

Imaging modes

Standard response scene/strip: Standard mode for imaging. Any off-nadir angle up to 45 degrees can be achieved. Scenes can be captured individually or in strips up to 175 scenes long.

Fast response scene/strip: Similar to standard response scene, however the satellite slews to the required angle much more rapidly. This allows more scenes to be captured over a particular target area.

Along-track stereo 30 degrees: Two scenes captured of the same target on the same pass, one pitched forward at 30 degrees, the other pitched backwards at 30 degrees.

Across-track stereo: Two scenes captured of the same target, but taken from different passes. One will be rolled left at a certain angle, the other rolled right. The time between images will vary but can be very short at higher latitudes using two of the three satellites where there fields of regard overlap.

Area 2x2: An artificial swath widening mode enabling an image to be captured which is 2 scenes wide and 2 scenes long

Click here to download the metadata dictionary