|
|
ICESat First Light Release:
…
| Title |
ICESat First Light Release: Antarctica, from Coast to Coast |
| Abstract |
ICESat's first topographic profiles across the continent reveal the textured surfaces of Antarctic ice sheets in unprecedented detail. The following profile spans the entire Antarctic continent from coast to coast. The transect begins near Wrigley Gulf, crosses the Ross Ice Shelf and central Antarctica, finally tapering off at the Amery Ice Shelf. The high flat area in the center of the continent is called the East Antarctic plateau. |
| Completed |
2003-05-23 |
|
ICESat First Light Release:
…
| Title |
ICESat First Light Release: Antarctica, from Coast to Coast |
| Abstract |
ICESat's first topographic profiles across the continent reveal the textured surfaces of Antarctic ice sheets in unprecedented detail. The following profile spans the entire Antarctic continent from coast to coast. The transect begins near Wrigley Gulf, crosses the Ross Ice Shelf and central Antarctica, finally tapering off at the Amery Ice Shelf. The high flat area in the center of the continent is called the East Antarctic plateau. |
| Completed |
2003-05-23 |
|
ICESat First Light Release:
…
| Title |
ICESat First Light Release: Antarctica, from Coast to Coast |
| Abstract |
ICESat's first topographic profiles across the continent reveal the textured surfaces of Antarctic ice sheets in unprecedented detail. The following profile spans the entire Antarctic continent from coast to coast. The transect begins near Wrigley Gulf, crosses the Ross Ice Shelf and central Antarctica, finally tapering off at the Amery Ice Shelf. The high flat area in the center of the continent is called the East Antarctic plateau. |
| Completed |
2003-05-23 |
|
ICESat First Light Release:
…
| Title |
ICESat First Light Release: Antarctica, from Coast to Coast |
| Abstract |
ICESat's first topographic profiles across the continent reveal the textured surfaces of Antarctic ice sheets in unprecedented detail. The following profile spans the entire Antarctic continent from coast to coast. The transect begins near Wrigley Gulf, crosses the Ross Ice Shelf and central Antarctica, finally tapering off at the Amery Ice Shelf. The high flat area in the center of the continent is called the East Antarctic plateau. |
| Completed |
2003-05-23 |
|
ICESat First Light Release:
…
| Title |
ICESat First Light Release: Antarctica, from Coast to Coast |
| Abstract |
ICESat's first topographic profiles across the continent reveal the textured surfaces of Antarctic ice sheets in unprecedented detail. The following profile spans the entire Antarctic continent from coast to coast. The transect begins near Wrigley Gulf, crosses the Ross Ice Shelf and central Antarctica, finally tapering off at the Amery Ice Shelf. The high flat area in the center of the continent is called the East Antarctic plateau. |
| Completed |
2003-05-23 |
|
ICESat First Light Release:
…
| Title |
ICESat First Light Release: Antarctica, from Coast to Coast |
| Abstract |
ICESat's first topographic profiles across the continent reveal the textured surfaces of Antarctic ice sheets in unprecedented detail. The following profile spans the entire Antarctic continent from coast to coast. The transect begins near Wrigley Gulf, crosses the Ross Ice Shelf and central Antarctica, finally tapering off at the Amery Ice Shelf. The high flat area in the center of the continent is called the East Antarctic plateau. |
| Completed |
2003-05-23 |
|
ICESat First Light Release:
…
| Title |
ICESat First Light Release: Antarctica, from Coast to Coast |
| Abstract |
ICESat's first topographic profiles across the continent reveal the textured surfaces of Antarctic ice sheets in unprecedented detail. The following profile spans the entire Antarctic continent from coast to coast. The transect begins near Wrigley Gulf, crosses the Ross Ice Shelf and central Antarctica, finally tapering off at the Amery Ice Shelf. The high flat area in the center of the continent is called the East Antarctic plateau. |
| Completed |
2003-05-23 |
|
ICESat First Light Release:
…
| Title |
ICESat First Light Release: A Closer View of the Coast |
| Abstract |
Elevation data from ICESat's GLAS instrument is quite detailed, as can be seen in this close-up view of a profile that passes near the Banzare Coast in Antarctica. (The green elevation profile in this animation is exaggerated vertically by a factor of 10x for aesthetic purposes.) |
| Completed |
2003-05-23 |
|
ICESat First Light Release:
…
| Title |
ICESat First Light Release: A Closer View of the Coast |
| Abstract |
Elevation data from ICESat's GLAS instrument is quite detailed, as can be seen in this close-up view of a profile that passes near the Banzare Coast in Antarctica. (The green elevation profile in this animation is exaggerated vertically by a factor of 10x for aesthetic purposes.) |
| Completed |
2003-05-23 |
|
ICESat First Light Release:
…
| Title |
ICESat First Light Release: A Closer View of the Coast |
| Abstract |
Elevation data from ICESat's GLAS instrument is quite detailed, as can be seen in this close-up view of a profile that passes near the Banzare Coast in Antarctica. (The green elevation profile in this animation is exaggerated vertically by a factor of 10x for aesthetic purposes.) |
| Completed |
2003-05-23 |
|
Pine Island Iceberg Formatio
…
| Title |
Pine Island Iceberg Formation |
| Abstract |
This animation is a sequence showing the formation of the Pine Island iceberg and the glacial seaward flow upstream from the crack. It is a series of MISR images from the Terra satellite on top of the continental Radarsat view of Antarctica. The Pine Island Glacier is the largest discharger of ice in Antarctica and the continent's fastest moving glacier. Even so, when a large crack formed across the glacier in mid 2000, it was surprising how fast the crack expanded, 15 meters per day, and how soon the resulting iceberg broke off, mid-November, 2001. This iceberg, called B-21, is 42 kilometers by 17 kilometers and contains seven years of glacier outflow released to the sea in a single event. |
| Completed |
2002-01-15 |
|
Pine Island Iceberg Formatio
…
| Title |
Pine Island Iceberg Formation |
| Abstract |
This animation is a sequence showing the formation of the Pine Island iceberg and the glacial seaward flow upstream from the crack. It is a series of MISR images from the Terra satellite on top of the continental Radarsat view of Antarctica. The Pine Island Glacier is the largest discharger of ice in Antarctica and the continent's fastest moving glacier. Even so, when a large crack formed across the glacier in mid 2000, it was surprising how fast the crack expanded, 15 meters per day, and how soon the resulting iceberg broke off, mid-November, 2001. This iceberg, called B-21, is 42 kilometers by 17 kilometers and contains seven years of glacier outflow released to the sea in a single event. |
| Completed |
2002-01-15 |
|
Pine Island Iceberg Formatio
…
| Title |
Pine Island Iceberg Formation |
| Abstract |
This animation is a sequence showing the formation of the Pine Island iceberg and the glacial seaward flow upstream from the crack. It is a series of MISR images from the Terra satellite on top of the continental Radarsat view of Antarctica. The Pine Island Glacier is the largest discharger of ice in Antarctica and the continent's fastest moving glacier. Even so, when a large crack formed across the glacier in mid 2000, it was surprising how fast the crack expanded, 15 meters per day, and how soon the resulting iceberg broke off, mid-November, 2001. This iceberg, called B-21, is 42 kilometers by 17 kilometers and contains seven years of glacier outflow released to the sea in a single event. |
| Completed |
2002-01-15 |
|
Pine Island Iceberg Formatio
…
| Title |
Pine Island Iceberg Formation |
| Abstract |
This animation is a sequence showing the formation of the Pine Island iceberg and the glacial seaward flow upstream from the crack. It is a series of MISR images from the Terra satellite on top of the continental Radarsat view of Antarctica. The Pine Island Glacier is the largest discharger of ice in Antarctica and the continent's fastest moving glacier. Even so, when a large crack formed across the glacier in mid 2000, it was surprising how fast the crack expanded, 15 meters per day, and how soon the resulting iceberg broke off, mid-November, 2001. This iceberg, called B-21, is 42 kilometers by 17 kilometers and contains seven years of glacier outflow released to the sea in a single event. |
| Completed |
2002-01-15 |
|
Pine Island Iceberg Formatio
…
| Title |
Pine Island Iceberg Formation |
| Abstract |
This animation is a sequence showing the formation of the Pine Island iceberg and the glacial seaward flow upstream from the crack. It is a series of MISR images from the Terra satellite on top of the continental Radarsat view of Antarctica. The Pine Island Glacier is the largest discharger of ice in Antarctica and the continent's fastest moving glacier. Even so, when a large crack formed across the glacier in mid 2000, it was surprising how fast the crack expanded, 15 meters per day, and how soon the resulting iceberg broke off, mid-November, 2001. This iceberg, called B-21, is 42 kilometers by 17 kilometers and contains seven years of glacier outflow released to the sea in a single event. |
| Completed |
2002-01-15 |
|
Pine Island Iceberg Formatio
…
| Title |
Pine Island Iceberg Formation |
| Abstract |
This animation is a sequence showing the formation of the Pine Island iceberg and the glacial seaward flow upstream from the crack. It is a series of MISR images from the Terra satellite on top of the continental Radarsat view of Antarctica. The Pine Island Glacier is the largest discharger of ice in Antarctica and the continent's fastest moving glacier. Even so, when a large crack formed across the glacier in mid 2000, it was surprising how fast the crack expanded, 15 meters per day, and how soon the resulting iceberg broke off, mid-November, 2001. This iceberg, called B-21, is 42 kilometers by 17 kilometers and contains seven years of glacier outflow released to the sea in a single event. |
| Completed |
2002-01-15 |
|
Pine Island Iceberg Formatio
…
| Title |
Pine Island Iceberg Formation |
| Abstract |
This animation is a sequence showing the formation of the Pine Island iceberg and the glacial seaward flow upstream from the crack. It is a series of MISR images from the Terra satellite on top of the continental Radarsat view of Antarctica. The Pine Island Glacier is the largest discharger of ice in Antarctica and the continent's fastest moving glacier. Even so, when a large crack formed across the glacier in mid 2000, it was surprising how fast the crack expanded, 15 meters per day, and how soon the resulting iceberg broke off, mid-November, 2001. This iceberg, called B-21, is 42 kilometers by 17 kilometers and contains seven years of glacier outflow released to the sea in a single event. |
| Completed |
2002-01-15 |
|
Pine Island Iceberg Formatio
…
| Title |
Pine Island Iceberg Formation |
| Abstract |
This animation is a sequence showing the formation of the Pine Island iceberg and the glacial seaward flow upstream from the crack. It is a series of MISR images from the Terra satellite on top of the continental Radarsat view of Antarctica. The Pine Island Glacier is the largest discharger of ice in Antarctica and the continent's fastest moving glacier. Even so, when a large crack formed across the glacier in mid 2000, it was surprising how fast the crack expanded, 15 meters per day, and how soon the resulting iceberg broke off, mid-November, 2001. This iceberg, called B-21, is 42 kilometers by 17 kilometers and contains seven years of glacier outflow released to the sea in a single event. |
| Completed |
2002-01-15 |
|
Pine Island Iceberg Formatio
…
| Title |
Pine Island Iceberg Formation |
| Abstract |
This animation is a sequence showing the formation of the Pine Island iceberg and the glacial seaward flow upstream from the crack. It is a series of MISR images from the Terra satellite on top of the continental Radarsat view of Antarctica. The Pine Island Glacier is the largest discharger of ice in Antarctica and the continent's fastest moving glacier. Even so, when a large crack formed across the glacier in mid 2000, it was surprising how fast the crack expanded, 15 meters per day, and how soon the resulting iceberg broke off, mid-November, 2001. This iceberg, called B-21, is 42 kilometers by 17 kilometers and contains seven years of glacier outflow released to the sea in a single event. |
| Completed |
2002-01-15 |
|
ICESat First Light Release:
…
| Title |
ICESat First Light Release: A Continuous View of Clouds |
| Abstract |
The GLAS laser system on ICESat is making unique measurements of the heights of clouds and their global distribution. In addition, ICESat can 'see' the distributions of aerosols from sources such as dust storms and forest fires. This animation shows the distribution of cloud layers as seens from the bird's eye perspective of the ICESat spacecraft. |
| Completed |
2003-05-15 |
|
ICESat First Light Release:
…
| Title |
ICESat First Light Release: A Continuous View of Clouds |
| Abstract |
The GLAS laser system on ICESat is making unique measurements of the heights of clouds and their global distribution. In addition, ICESat can 'see' the distributions of aerosols from sources such as dust storms and forest fires. This animation shows the distribution of cloud layers as seens from the bird's eye perspective of the ICESat spacecraft. |
| Completed |
2003-05-15 |
|
ICESat First Light Release:
…
| Title |
ICESat First Light Release: A Continuous View of Clouds |
| Abstract |
The GLAS laser system on ICESat is making unique measurements of the heights of clouds and their global distribution. In addition, ICESat can 'see' the distributions of aerosols from sources such as dust storms and forest fires. This animation shows the distribution of cloud layers as seens from the bird's eye perspective of the ICESat spacecraft. |
| Completed |
2003-05-15 |
|
ICESat First Light Release:
…
| Title |
ICESat First Light Release: Antarctica in Three Dimensions |
| Abstract |
ICESat's orbit was designed to maximize coverage over the great polar ice sheets, where ground tracks overlap to create an intricate grid of data points. The accumulation of these data points in the Southern Hemisphere results in a new three-dimensional elevation model of Antarctica. ICESat repeats its orbital pattern every eight days, allowing the GLAS instrument to measure changes over time in the same location. In order to measure ice sheet mass balance, the satellite's advanced technology is providing data on the critically important third dimension, elevation. |
| Completed |
2003-05-15 |
|
ICESat First Light Release:
…
| Title |
ICESat First Light Release: Antarctica in Three Dimensions |
| Abstract |
ICESat's orbit was designed to maximize coverage over the great polar ice sheets, where ground tracks overlap to create an intricate grid of data points. The accumulation of these data points in the Southern Hemisphere results in a new three-dimensional elevation model of Antarctica. ICESat repeats its orbital pattern every eight days, allowing the GLAS instrument to measure changes over time in the same location. In order to measure ice sheet mass balance, the satellite's advanced technology is providing data on the critically important third dimension, elevation. |
| Completed |
2003-05-15 |
|
ICESat First Light Release:
…
| Title |
ICESat First Light Release: A Global Perspective |
| Abstract |
Criss-crossing the world below at nearly 17,000 miles per hour, ICESat is measuring the Earth from space with unprecedented accuracy. ICESAT measures the Earth by shining pulses of green and infrared light from one of its three onboard lasers. Although the major goal of ICESAT's mission is to observe ice near the poles, the satellite takes measurements continuously around the entire globe, providing valuable information about our planet's clouds, oceans, mountains, forests, and fields. |
| Completed |
2003-05-15 |
|
ICESat First Light Release:
…
| Title |
ICESat First Light Release: A Global Perspective |
| Abstract |
Criss-crossing the world below at nearly 17,000 miles per hour, ICESat is measuring the Earth from space with unprecedented accuracy. ICESAT measures the Earth by shining pulses of green and infrared light from one of its three onboard lasers. Although the major goal of ICESAT's mission is to observe ice near the poles, the satellite takes measurements continuously around the entire globe, providing valuable information about our planet's clouds, oceans, mountains, forests, and fields. |
| Completed |
2003-05-15 |
|
ICESat First Light Release:
…
| Title |
ICESat First Light Release: A Global Perspective |
| Abstract |
Criss-crossing the world below at nearly 17,000 miles per hour, ICESat is measuring the Earth from space with unprecedented accuracy. ICESAT measures the Earth by shining pulses of green and infrared light from one of its three onboard lasers. Although the major goal of ICESAT's mission is to observe ice near the poles, the satellite takes measurements continuously around the entire globe, providing valuable information about our planet's clouds, oceans, mountains, forests, and fields. |
| Completed |
2003-05-15 |
|
ICESat First Light Release:
…
| Title |
ICESat First Light Release: Following ICESat |
| Abstract |
In this visualization we ride along with the ICESat spacecraft as its laser measures detailed changes in surface topography. This was produced in support of the ICESat first light release. |
| Completed |
2003-05-15 |
|
ICESat First Light Release:
…
| Title |
ICESat First Light Release: Following ICESat |
| Abstract |
In this visualization we ride along with the ICESat spacecraft as its laser measures detailed changes in surface topography. This was produced in support of the ICESat first light release. |
| Completed |
2003-05-15 |
|
ICESat First Light Release:
…
| Title |
ICESat First Light Release: From Sea Ice to Ice Streams |
| Abstract |
The following profile shows the dramatic change in elevation from coastal Antarctica, which is covered in sea ice for most of the year, to the center of the continent. It starts near the Amundsen Sea and travels inward, ending over the West Antarctic Ice Streams where we get a look at this dynamic portion of the polar landscape. (The green elevation profile in this animation is exaggerated vertically by a factor of 10x.) |
| Completed |
2003-05-23 |
|
ICESat First Light Release:
…
| Title |
ICESat First Light Release: From Sea Ice to Ice Streams |
| Abstract |
The following profile shows the dramatic change in elevation from coastal Antarctica, which is covered in sea ice for most of the year, to the center of the continent. It starts near the Amundsen Sea and travels inward, ending over the West Antarctic Ice Streams where we get a look at this dynamic portion of the polar landscape. (The green elevation profile in this animation is exaggerated vertically by a factor of 10x.) |
| Completed |
2003-05-23 |
|
ICESat First Light Release:
…
| Title |
ICESat First Light Release: From Sea Ice to Ice Streams |
| Abstract |
The following profile shows the dramatic change in elevation from coastal Antarctica, which is covered in sea ice for most of the year, to the center of the continent. It starts near the Amundsen Sea and travels inward, ending over the West Antarctic Ice Streams where we get a look at this dynamic portion of the polar landscape. (The green elevation profile in this animation is exaggerated vertically by a factor of 10x.) |
| Completed |
2003-05-23 |
|
Ice Types in the Beaufort Se
…
| Title |
Ice Types in the Beaufort Sea, Alaska |
| Description |
browse image, of orbit 6663 (420 KB JPEG) Determining the amount and type of sea ice in the polar oceans is crucial to improving our knowledge and understanding of polar weather and long term climate fluctuations. These views from two satellite remote sensing instruments, the synthetic aperture radar (SAR) on board the RADARSAT satellite and the Multi-angle Imaging SpectroRadiometer (MISR), illustrate different methods that may be used to assess sea ice type. Sea ice in the Beaufort Sea off the north coast of Alaska was classified and mapped in these concurrent images acquired March 19, 2001 and mapped to the same geographic area. To identify sea ice types, the National Oceanic and Atmospheric Administration (NOAA) National Ice Center constructs ice charts using several data sources including RADARSAT SAR images such as the one shown at left. SAR classifies sea ice types primarily by how the surface and subsurface roughness influence radar backscatter. In the SAR image, white lines delineate different sea ice zones as identified by the National Ice Center. Regions of mostly multiyear ice (A) are separated from regions with large amounts of first year and younger ice (B-D), and the dashed white line at bottom marks the coastline. In general, sea ice types that exhibit increased radar backscatter appear bright in SAR and are identified as rougher, older ice types. Younger, smoother ice types appear dark to SAR. Near the top of the SAR image, however, red arrows point to bright areas in which large, crystalline "frost flowers" have formed on young, thin ice, causing this young ice type to exhibit an increased radar backscatter. Frost flowers are strongly backscattering at radar wavelengths (cm) due to both surface roughness and the high salinity of frost flowers, which causes them to be highly reflective to radar energy. Surface roughness is also registered by MISR, although the roughness observed is at a different spatial scale. Older, rougher ice areas are predominantly backward scattering to the MISR cameras, whereas younger, smoother ice types are predominantly forward scattering. The MISR map at right was generated using a statistical classification routine (called ISODATA) and analyzed using ice charts from the National Ice Center. Five classes of sea ice were found based upon the classification of MISR angular data. These are described, based on interpretation of the SAR image, by the image key. Very smooth ice areas that are predominantly forward scattering are colored red. Frost flowers are largely smooth to the MISR visible band sensor and are mapped as forward scattering. Areas mapped as blue are predominantly backward scattering, and the other three classes have statistically distinct angular signatures and fall within the middle of the forward/backward scattering continuum. Some areas that may be first year or younger ice between the multi year ice floes are not discernible to SAR, illustrating how MISR potentially can make a unique contribution, to sea ice mapping. The Multi-angle Imaging SpectroRadiometer observes the daylit Earth continuously and every 9 days views the entire globe between 82 degrees north and 82 degrees south latitude. The MISR Browse Image Viewer [ http://earthobservatory.nasa.gov/cgi-bin/redirect?http://eosweb.larc.nasa.gov/MISRBR/ ] provides access to low-resolution true-color versions of these images. This data product was generated from a portion of the imagery acquired during Terra orbit 6663. The MISR image has been cropped to include an area that is 200 kilometers wide, and utilizes data from blocks 30 to 33 within World Reference System-2 path 71. Image courtesy NASA/GSFC/LaRC/JPL, MISR Team. [ http://earthobservatory.nasa.gov/cgi-bin/redirect?http://www-misr.jpl.nasa.gov/ ] RADARSAT image courtesy NOAA Satellite Active Archive. Figure reprinted courtesy of IEEE. |
|
Ice Types in the Beaufort Se
…
| Title |
Ice Types in the Beaufort Sea, Alaska |
| Description |
browse image, of orbit 6663 (420 KB JPEG) Determining the amount and type of sea ice in the polar oceans is crucial to improving our knowledge and understanding of polar weather and long term climate fluctuations. These views from two satellite remote sensing instruments, the synthetic aperture radar (SAR) on board the RADARSAT satellite and the Multi-angle Imaging SpectroRadiometer (MISR), illustrate different methods that may be used to assess sea ice type. Sea ice in the Beaufort Sea off the north coast of Alaska was classified and mapped in these concurrent images acquired March 19, 2001 and mapped to the same geographic area. To identify sea ice types, the National Oceanic and Atmospheric Administration (NOAA) National Ice Center constructs ice charts using several data sources including RADARSAT SAR images such as the one shown at left. SAR classifies sea ice types primarily by how the surface and subsurface roughness influence radar backscatter. In the SAR image, white lines delineate different sea ice zones as identified by the National Ice Center. Regions of mostly multiyear ice (A) are separated from regions with large amounts of first year and younger ice (B-D), and the dashed white line at bottom marks the coastline. In general, sea ice types that exhibit increased radar backscatter appear bright in SAR and are identified as rougher, older ice types. Younger, smoother ice types appear dark to SAR. Near the top of the SAR image, however, red arrows point to bright areas in which large, crystalline "frost flowers" have formed on young, thin ice, causing this young ice type to exhibit an increased radar backscatter. Frost flowers are strongly backscattering at radar wavelengths (cm) due to both surface roughness and the high salinity of frost flowers, which causes them to be highly reflective to radar energy. Surface roughness is also registered by MISR, although the roughness observed is at a different spatial scale. Older, rougher ice areas are predominantly backward scattering to the MISR cameras, whereas younger, smoother ice types are predominantly forward scattering. The MISR map at right was generated using a statistical classification routine (called ISODATA) and analyzed using ice charts from the National Ice Center. Five classes of sea ice were found based upon the classification of MISR angular data. These are described, based on interpretation of the SAR image, by the image key. Very smooth ice areas that are predominantly forward scattering are colored red. Frost flowers are largely smooth to the MISR visible band sensor and are mapped as forward scattering. Areas mapped as blue are predominantly backward scattering, and the other three classes have statistically distinct angular signatures and fall within the middle of the forward/backward scattering continuum. Some areas that may be first year or younger ice between the multi year ice floes are not discernible to SAR, illustrating how MISR potentially can make a unique contribution, to sea ice mapping. The Multi-angle Imaging SpectroRadiometer observes the daylit Earth continuously and every 9 days views the entire globe between 82 degrees north and 82 degrees south latitude. The MISR Browse Image Viewer [ http://earthobservatory.nasa.gov/cgi-bin/redirect?http://eosweb.larc.nasa.gov/MISRBR/ ] provides access to low-resolution true-color versions of these images. This data product was generated from a portion of the imagery acquired during Terra orbit 6663. The MISR image has been cropped to include an area that is 200 kilometers wide, and utilizes data from blocks 30 to 33 within World Reference System-2 path 71. Image courtesy NASA/GSFC/LaRC/JPL, MISR Team. [ http://earthobservatory.nasa.gov/cgi-bin/redirect?http://www-misr.jpl.nasa.gov/ ] RADARSAT image courtesy NOAA Satellite Active Archive. Figure reprinted courtesy of IEEE. |
|
Twin Blue Marbles: Image of
…
nasa, nasaimageofthedaygalle
…
A day's clouds. The shape an
…
ipcc_bluemarble
| mediatype |
IMAGE |
| mediatype |
image |
| date |
2001-09-06 |
| creator |
NASA -- NASA images by Reto Stöckli, based on data from NASA and NOAA. |
| identifier |
ipcc_bluemarble |
|
Ward Hunt Ice Shelf: Image o
…
nasa, nasaimageofthedaygalle
…
* eoimages.gsfc.nasa.gov/ima
…
Ellesmere.A2002219.2035
| mediatype |
IMAGE |
| mediatype |
image |
| date |
2002-08-07 |
| creator |
NASA -- Images courtesy Jacques Descloitres, rapidfire.sci.gsfc.nasa.gov MODIS Rapid Response Team at NASA GSFC. Image interpretation provided by Derek Mueller and Warwick Vincent, Centre d'Etudes nordiques, Universite Laval in Quebec, Canada and Martin Jeffries, Geophysical Institute, University of Alaska Fairbanks in Fairbanks, Alaska. |
| identifier |
Ellesmere.A2002219.2035 |
|
Wet-Season Floods Along the
…
nasa, nasaimageofthedaygalle
…
August is often a critical t
…
Mekong_RST_2006240
| mediatype |
IMAGE |
| mediatype |
image |
| date |
2006-03-13 |
| creator |
NASA -- Image product by www.hatfieldgroup.com Hatfield Consultants Ltd. RADARSAT-1 images copyright the Canadian Space Agency |
| identifier |
Mekong_RST_2006240 |
|
Oil Spill near Guimaras Isla
…
nasa, nasaimageofthedaygalle
…
Strong winds and high waves
…
guimaras_ast_2006241
| mediatype |
IMAGE |
| mediatype |
image |
| date |
2006-08-29 |
| creator |
NASA -- NASA image created by Jesse Allen, Earth Observatory, using data provided courtesy of the NASA/GSFC/MITI/ERSDAC/JAROS, and U.S./Japan asterweb.jpl.nasa.gov/ ASTER Science Team. |
| identifier |
guimaras_ast_2006241 |
|
Ice Types in the Beaufort Se
…
PIA04300
Sol (our sun)
Multi-angle Imaging SpectroR
…
| Title |
Ice Types in the Beaufort Sea, Alaska |
| Original Caption Released with Image |
Determining the amount and type of sea ice in the polar oceans is crucial to improving our knowledge and understanding of polar weather and long term climate fluctuations. These views from two satellite remote sensing instruments, the synthetic aperture radar (SAR) on board the RADARSAT satellite and the Multi-angle Imaging SpectroRadiometer (MISR), illustrate different methods that may be used to assess sea ice type. Sea ice in the Beaufort Sea off the north coast of Alaska was classified and mapped in these concurrent images acquired March 19, 2001 and mapped to the same geographic area. To identify sea ice types, the National Oceanic and Atmospheric Administration (NOAA) National Ice Center constructs ice charts using several data sources including RADARSAT SAR images such as the one shown at left. SAR classifies sea ice types primarily by how the surface and subsurface roughness influence radar backscatter. In the SAR image, white lines delineate different sea ice zones as identified by the National Ice Center. Regions of mostly multi-year ice (A) are separated from regions with large amounts of first year and younger ice (B-D), and the dashed white line at bottom marks the coastline. In general, sea ice types that exhibit increased radar backscatter appear bright in SAR and are identified as rougher, older ice types. Younger, smoother ice types appear dark to SAR. Near the top of the SAR image, however, red arrows point to bright areas in which large, crystalline "frost flowers" have formed on young, thin ice, causing this young ice type to exhibit an increased radar backscatter. Frost flowers are strongly backscattering at radar wavelengths (cm) due to both surface roughness and the high salinity of frost flowers, which causes them to be highly reflective to radar energy. Surface roughness is also registered by MISR, although the roughness observed is at a different spatial scale. Older, rougher ice areas are predominantly backward scattering to the MISR cameras, whereas younger, smoother ice types are predominantly forward scattering. The MISR map at right was generated using a statistical classification routine (called ISODATA) and analyzed using ice charts from the National Ice Center. Five classes of sea ice were found based upon the classification of MISR angular data. These are described, based on interpretation of the SAR image, by the image key. Very smooth ice areas that are predominantly forward scattering are colored red. Frost flowers are largely smooth to the MISR visible band sensor and are mapped as forward scattering. Areas mapped as blue are predominantly backward scattering, and the other three classes have statistically distinct angular signatures and fall within the middle of the forward/backward scattering continuum. Some areas that may be first year or younger ice between the multi year ice floes are not discernible to SAR, illustrating how MISR potentially can make a unique contribution to sea ice mapping. The, Multi-angle Imaging SpectroRadiometer observes the daylit Earth continuously and every 9 days views the entire globe between 82 degrees north and 82 degrees south latitude. This data product was generated from a portion of the imagery acquired during Terra orbit 6663. The MISR image has been cropped to include an area that is 200 kilometers wide, and utilizes data from blocks 30 to 33 within World Reference System-2 path 71. MISR was built and is managed by NASA's Jet Propulsion Laboratory,Pasadena, CA, for NASA's Office of Earth Science, Washington, DC. The Terra satellite is managed by NASA's Goddard Space Flight Center,Greenbelt, MD. JPL is a division of the California Institute ofTechnology. |
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