ABSTRACT The Moderate Resolution Imaging Spectroradiometer (MODIS) has 36 spectral bands that are... more ABSTRACT The Moderate Resolution Imaging Spectroradiometer (MODIS) has 36 spectral bands that are distributed, according to their wavelengths, on four focal plane assemblies (FPAs): visible (VIS), near infrared (NIR), short- and mid-wave infrared (SMIR), and long-wave infrared (LWIR). One of the MODIS on-board calibrators, the spectro-radiometric calibration assembly (SRCA), is used to track the sensor's on-orbit spatial characterization. It is also capable of performing instrument radiometric stability monitoring and spectral characterization (measurements of the center wavelengths and bandwidths). This paper focuses on the SRCA's spatial characterization function and presents the results (on-orbit performance) derived from the observations made by the Terra MODIS since its launch in December 1999. The SRCA spectral characterization results of Terra MODIS over the same five-year period are covered in another paper in these proceedings (Xiong et. al.). The MODIS on-orbit spatial characterization discussed in this paper includes measurements of the detector-to-detector registration (DDR) in the along-scan direction, the band-to-band registration (BBR) in both along-scan and along track directions, and the focal plane-to-focal plane registration (FFR) in both directions. These measurements are typically performed bi-monthly. The results will show that the overall along-scan BBR performance of the Terra MODIS has been satisfactory (less than 0.16km), meeting the specification of 0.20km. Except for a few bands of slightly over 0.20km, the along-track BBR values are also within the specification.
2010 IEEE International Geoscience and Remote Sensing Symposium, 2010
ABSTRACT Since launch, Terra and Aqua MODIS have successfully operated for more than 10 years and... more ABSTRACT Since launch, Terra and Aqua MODIS have successfully operated for more than 10 years and 8 years, respectively. Data products derived from MODIS observations have been widely distributed to the science and user community, enabling a broad range of applications. MODIS collects data in 36 spectral bands, covering wavelengths from visible (VIS) to long-wave infrared (LWIR). They are calibrated on-orbit by a set of on-board calibrators (OBC). This paper provides an overview of instrument operation, calibration, and performance, including lessons learned. Though having exceeded their design lifetime of 6 years, both Terra and Aqua MODIS continue to perform well, collect useful data, and support Earth remote sensing applications.
IEEE International Geoscience and Remote Sensing Symposium, 2002
Information from the Moderate Resolution Imaging Spectroradiometer (MODIS), launched on the Terra... more Information from the Moderate Resolution Imaging Spectroradiometer (MODIS), launched on the Terra satellite in December 1999, is considered a powerful means to improve global snow cover maps and to generate a fractional snow cover product. Estimates of snow fraction are viewed as useful for atmospheric and hydrologic snowmelt runoff modeling, monitoring changes in snow coverage and energy fluxes, as well
IGARSS 2001. Scanning the Present and Resolving the Future. Proceedings. IEEE 2001 International Geoscience and Remote Sensing Symposium (Cat. No.01CH37217), 2001
Moderate Resolution Imaging Spectroradiometer (MODIS) snow-cover maps have been available since S... more Moderate Resolution Imaging Spectroradiometer (MODIS) snow-cover maps have been available since September 13, 2000. These products, at 500-m spatial resolution, are available through the National Snow and Ice Data Center Distributed Active Archive Center in Boulder, Colorado. By the 2001-02 winter, 5-km climate-modeling grid (CMG) products will be available for presentation of global views of snow cover and for use
2007 IEEE International Geoscience and Remote Sensing Symposium, 2007
Since launch the NASA EOS Terra MODIS has been in operation for more than seven years and the Aqu... more Since launch the NASA EOS Terra MODIS has been in operation for more than seven years and the Aqua MODIS for nearly five years. Each MODIS has 20 reflective solar bands and 16 thermal emissive bands. It makes observations at three nadir spatial resolutions: 0.25 km, 0.5 km, and 1 km and is calibrated on- orbit by a set of
Geoscience and Remote Sensing IEEE International Symposium, 2005
The Moderate Resolution Imaging Spectroradiometer (MODIS) makes observations using 36 spectral ba... more The Moderate Resolution Imaging Spectroradiometer (MODIS) makes observations using 36 spectral bands with wavelengths from 0.41 to 14.4µm and nadir spatial resolutions of 0.25km, 0.5km, and 1km. It is currently operating onboard the NASA Earth Observing System (EOS) Terra and Aqua satellites, launched in December 1999 and May 2002, respectively. The MODIS Level 1B (L1B) program converts the sensor's on-orbit
ABSTRACT The Moderate Resolution Imaging Spectroradiometer (MODIS) has 36 spectral bands that are... more ABSTRACT The Moderate Resolution Imaging Spectroradiometer (MODIS) has 36 spectral bands that are distributed, according to their wavelengths, on four focal plane assemblies (FPAs): visible (VIS), near infrared (NIR), short- and mid-wave infrared (SMIR), and long-wave infrared (LWIR). One of the MODIS on-board calibrators, the spectro-radiometric calibration assembly (SRCA), is used to track the sensor's on-orbit spatial characterization. It is also capable of performing instrument radiometric stability monitoring and spectral characterization (measurements of the center wavelengths and bandwidths). This paper focuses on the SRCA's spatial characterization function and presents the results (on-orbit performance) derived from the observations made by the Terra MODIS since its launch in December 1999. The SRCA spectral characterization results of Terra MODIS over the same five-year period are covered in another paper in these proceedings (Xiong et. al.). The MODIS on-orbit spatial characterization discussed in this paper includes measurements of the detector-to-detector registration (DDR) in the along-scan direction, the band-to-band registration (BBR) in both along-scan and along track directions, and the focal plane-to-focal plane registration (FFR) in both directions. These measurements are typically performed bi-monthly. The results will show that the overall along-scan BBR performance of the Terra MODIS has been satisfactory (less than 0.16km), meeting the specification of 0.20km. Except for a few bands of slightly over 0.20km, the along-track BBR values are also within the specification.
2010 IEEE International Geoscience and Remote Sensing Symposium, 2010
ABSTRACT Since launch, Terra and Aqua MODIS have successfully operated for more than 10 years and... more ABSTRACT Since launch, Terra and Aqua MODIS have successfully operated for more than 10 years and 8 years, respectively. Data products derived from MODIS observations have been widely distributed to the science and user community, enabling a broad range of applications. MODIS collects data in 36 spectral bands, covering wavelengths from visible (VIS) to long-wave infrared (LWIR). They are calibrated on-orbit by a set of on-board calibrators (OBC). This paper provides an overview of instrument operation, calibration, and performance, including lessons learned. Though having exceeded their design lifetime of 6 years, both Terra and Aqua MODIS continue to perform well, collect useful data, and support Earth remote sensing applications.
IEEE International Geoscience and Remote Sensing Symposium, 2002
Information from the Moderate Resolution Imaging Spectroradiometer (MODIS), launched on the Terra... more Information from the Moderate Resolution Imaging Spectroradiometer (MODIS), launched on the Terra satellite in December 1999, is considered a powerful means to improve global snow cover maps and to generate a fractional snow cover product. Estimates of snow fraction are viewed as useful for atmospheric and hydrologic snowmelt runoff modeling, monitoring changes in snow coverage and energy fluxes, as well
IGARSS 2001. Scanning the Present and Resolving the Future. Proceedings. IEEE 2001 International Geoscience and Remote Sensing Symposium (Cat. No.01CH37217), 2001
Moderate Resolution Imaging Spectroradiometer (MODIS) snow-cover maps have been available since S... more Moderate Resolution Imaging Spectroradiometer (MODIS) snow-cover maps have been available since September 13, 2000. These products, at 500-m spatial resolution, are available through the National Snow and Ice Data Center Distributed Active Archive Center in Boulder, Colorado. By the 2001-02 winter, 5-km climate-modeling grid (CMG) products will be available for presentation of global views of snow cover and for use
2007 IEEE International Geoscience and Remote Sensing Symposium, 2007
Since launch the NASA EOS Terra MODIS has been in operation for more than seven years and the Aqu... more Since launch the NASA EOS Terra MODIS has been in operation for more than seven years and the Aqua MODIS for nearly five years. Each MODIS has 20 reflective solar bands and 16 thermal emissive bands. It makes observations at three nadir spatial resolutions: 0.25 km, 0.5 km, and 1 km and is calibrated on- orbit by a set of
Geoscience and Remote Sensing IEEE International Symposium, 2005
The Moderate Resolution Imaging Spectroradiometer (MODIS) makes observations using 36 spectral ba... more The Moderate Resolution Imaging Spectroradiometer (MODIS) makes observations using 36 spectral bands with wavelengths from 0.41 to 14.4µm and nadir spatial resolutions of 0.25km, 0.5km, and 1km. It is currently operating onboard the NASA Earth Observing System (EOS) Terra and Aqua satellites, launched in December 1999 and May 2002, respectively. The MODIS Level 1B (L1B) program converts the sensor's on-orbit
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