Jun 28, 2013Landsat 8 Data Processing and Archive System (DPAS)

The USGS is also developing the DPAS to manage the mission data transmitted from the LDCM observatory. The DPAS will be operated at EROS along with the rest of its Landsat data archive and it will consist of several subsystems: Storage and Archive (SA), Ingest System (IS), Subsetter System (SS), Image Assessment System (IAS), Level 1 Product Generation System (LPGS), and User Portal (UP). These subsystems will work together to ingest, store, and archive LDCM data and will also generate LDCM data products for distribution.

Jun 28, 2013Landsat 8 Mission Operations Center (MOC)

A flight operations team (FOT) will operate two computer systems within the MOC, the Collection Activity Planning Element (CAPE) and the Mission Operations Element (MOE). The CAPE will plan science data collection by building activity requests for the LDCM imaging sensors each day. The MOE will translate the activity requests into software command loads transmitted to the observatory.

ground system logo 2
Jun 28, 2013Landsat 8 Ground System

The Landsat 8 Ground System includes all of the ground-based assets needed to operate the Landsat 8 observatory. The primary components of the Ground System are the Mission Operations Element, Collection Activity Planning Element, Ground Network Element, and the Data Processing and Archive System.

Relative Spectral Response
Jun 28, 2013Spectral Response of the Operational Land Imager In-Band, Band-Average Relative Spectral Response

The band-average relative spectral radiance responses of the Operational Land Imager (OLI) are provided.

OLI prelaunch signal-to-noise ratio
Jun 28, 2013Pre-launch OLI Performance

BATC has conducted robust testing of OLI performance in accordance with their proposal and contract. These prelaunch tests indicate that OLI performance meets specification with requirements exceeded in most cases.

drawing of OLI
Jun 28, 2013OLI Design

< OLI Requirements Pre-launch OLI Performance >   The OLI is a push broom sensor employing a focal plane with long arrays of photosensitive detectors (Irons & Dwyer, 2010). A four-mirror anastigmatic telescope focuses incident radiation onto the focal plane while providing a 15-degree field-of-view covering a 185 km across-track ground swath from the nominal LDCM […]

Jun 28, 2013OLI Requirements

< Operational Land Imager (OLI) OLI Design >   The OLI requirements specified a sensor that collects image data for nine spectral bands with a spatial resolution of 30 m (15 m panchromatic band) over a 185 km swath from the nominal 705 km LDCM spacecraft altitude. Key requirements include: a five-year design life; spectral band widths, center wavelengths, […]

TIRS telescope
Jun 27, 2013Spectral Response of the Thermal Infrared Sensor

< TIRS Design   In-Band, Band-Average Relative Spectral Response The band-average relative spectral radiance responses of the Thermal Infrared Sensor (TIRS) are provided here. These responses are based on measurements of the individual optical and electro-optical components of the instrument (Figure 1) combined to estimate the end-to-end instrument response. Filters: The filter spectral transmissions used […]

TIRS cryocooler
Jun 27, 2013TIRS Design

< TIRS Requirements TIRS Relative Spectral Response >   Like OLI, TIRS is also a push broom sensor employing a focal plane with long arrays of photosensitive detectors (Fig. 6). A four-element refractive telescope focuses an f/1.64 beam of thermal radiation onto a cryogenically cooled focal plane while providing a 15-degree field-of-view matching the 185 km […]

Jun 27, 2013TIRS Requirements

< Thermal Infrared Sensor TIRS Design >   TIRS requirements are specified in a manner similar to the OLI requirements. The specifications require TIRS to collect image data for two thermal infrared spectral bands with a spatial resolution of 120 m across a 185 km swath from the nominal 705 km Landsat altitude (Table 3). […]

Landsat 5
Jun 26, 2013Historic Landsat 5 Mission Ends

When the Landsat 5 satellite launched on March 1, 1984, it was expected to last at least three years. More than 29 years and 2.5 million images later, the U.S. Geological Survey issued the final command to the aged satellite on June 5, 2013, and officially decommissioned it on June 19.

launch vehicle assembly
Jun 19, 2013Launch Vehicle

The LDCM observatory will launch from Space Launch Complex-3E at Vandenberg Air Force Base aboard an Atlas V 401 launch vehicle built by the United Launch Alliance (ULA). This rocket is an evolved expendable launch vehicle capable of placing a 9370 kg satellite in low-Earth orbit. This capability offers ample mass margin for the LDCM […]

Thermal Infrared Sensor (TIRS)
Jun 19, 2013Thermal Infrared Sensor (TIRS)

TIRS Requirements > The Thermal Infrared Sensor (TIRS) measures land surface temperature in two thermal bands with a new technology that applies quantum physics to detect heat. TIRS was added to the satellite mission when it became clear that state water resource managers rely on the highly accurate measurements of Earth’s thermal energy obtained by […]

Jun 19, 2013Landsat Math

The following problems apply the math skills listed in order to explore and understand various proceses that relate to the Landsat mission. The topics range from how remote sensors collect and interpret photons to how Landsat is currently used to monitor the effects of climate change on the Earth. Some problems discuss satellites other than […]

Operational Land Imager (OLI)
Jun 19, 2013Operational Land Imager (OLI)

OLI Requirements > The Operational Land Imager (OLI), built by the Ball Aerospace & Technologies Corporation, measures in the visible, near infrared, and short wave infrared portions of the spectrum. Its images have 15-meter (49 ft.) panchromatic and 30-meter multi-spectral spatial resolutions along a 185 km (115 miles) wide swath, covering wide areas of the […]

Spacecraft Design
Jun 19, 2013Spacecraft Design

< Spacecraft   The spacecraft will supplies power, orbit and attitude control, communications, and data storage for OLI and TIRS. The spacecraft consists of the mechanical subsystem (primary structure and deployable mechanisms), command and data handling subsystem, attitude control subsystem, electrical power subsystem, radio frequency (RF) communications subsystem, the hydrazine propulsion subsystem and thermal control […]

Jun 15, 2013MapBox Puts Landsat 8 Bands to Work

MapBox imagery specialist Charlie Loyd takes a detailed look at Landsat 8’s spectral bands.

Landsat 8 spacecraft
Jun 14, 2013Spacecraft

Spacecraft Design > Landsat 8 consist of two major segments: the observatory and the ground system. The observatory consists of the spacecraft bus and its payload of two Earth observing sensors, the Operational Land Imager (OLI) and the Thermal Infrared Sensor (TIRS). OLI and TIRS collect Landsat 8 science data. The two sensors coincidently collect […]

Jun 11, 2013Landsat Satellite Looks Back at El Paso, Forward to a New Mission

Landsat 8 is operational and producing more than 400 images per day, adding to the deep archive collected since 1972.

Jun 5, 2013Final Command Sent to Landsat 5

For over 29 years, commands have been sent to Landsat 5 for acquisitions, orbital maneuvers, to fix problems, and even to avoid space junk. Today at 11:34 EDT, the final command was sent to Landsat 5, to turn her solar array away from the sun, essentially ending further power to the onboard computer. She is out of fuel and will reenter and burn up in Earth’s atmosphere in around 21 years. Landsat 5 was certainly crotchety at times, but her longevity is now legend, and we’ll miss her.