NASA Landsat 7 PDF Print E-mail
Landsat 7

The Landsat Program is a series of Earth-observing satellite missions jointly managed by NASA and the U.S. Geological Survey. Since 1972, Landsat satellites have collected information about Earth from space. This science, known as remote sensing, has matured with the Landsat Program.

Landsat satellites have taken specialized digital photographs of Earth’s continents and surrounding coastal regions for over three decades, enabling people to study many aspects of our planet and to evaluate the dynamic changes caused by both natural processes and human practices.

Landsat 7 is the most accurately calibrated Earth-observing satellite, i.e., its measurements are extremely accurate when compared to the same measurements made on the ground.  Landsat 7’s sensor has been called “the most stable, best characterized Earth observation instrument ever placed in orbit.”  Landsat 7’s rigorous calibration standards have made it the validation choice for many coarse-resolution sensors.


Cape Canaverel From Landsat7

[Cape Canaveral launching site (Florida) observed by LANDSAT 7]

Imagery from Space and High Bitrate Satellite Links go hand in hand.

Metrodata's goal is to improve and optimise satellite links by ensuring that transponders can be saturated with data. RF and TCP optimisation are areas which we do not do, but can also add efficiency to satellite links.

Metrodata's involvment in Space Imagery was mainly with the NASA Landsat Program. What started things off was probably our work with Verestar (now part of SES-Americom), Telenor and NASA GSFC (Goddard Space Flight Center). Metrodata provided our AP3000 product basically as a HSSI Fiber Optic Modem, where we transported 51.84Mbps satellite from the Landsat 7 imagery satellite and put it over AT&T OC-3 ATM network. Previously this link could only operate to 45Mbps with the existing HSSI FOM's so NASA got more throughput. This was for connection of the Landsat Ground Station (LGS) at Svalbard, Norway to the Mission Operations Center (MOC) at NASA Goddard Space Flight Center.

This fixed rate HSSI module was a special development. To allow further scalability and faster data rates we then developed the Flexi HSSI Module which supported asymmetric/symmetric and simplex bitrates from 8kbps to 90Mbps in 1bps increments.

Following on from a successful deployment with NASA for Landsat, Metrodata then did another development via Lockheed Martin and CSOC to support replacement of ECL Fiber Optic Modems.  So we did an ECL variant of the Flexi HSSI Module.

So what we had was a solution that was scaleable, precisely clocked and supported lots of odd bitrates. That was our starter for ten.

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