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Digital elevation model and orthophotographs of Greenland based on aerial photographs from 1978-1987.

Korsgaard NJ, Nuth C, Khan SA, Kjeldsen KK, Bjørk AA, Schomacker A, Kjær KH - Sci Data (2016)

Bottom Line: Supporting data consist of a reliability mask and a photo footprint coverage with recording dates.Through one internal and two external validation tests, this DEM shows an accuracy better than 10 m horizontally and 6 m vertically while the precision is better than 4 m.This dataset proved successful for topographical mapping and geodetic mass balance.

View Article: PubMed Central - PubMed

Affiliation: Centre for GeoGenetics, Natural History Museum, University of Copenhagen, 1350 Copenhagen, Denmark.

ABSTRACT
Digital Elevation Models (DEMs) play a prominent role in glaciological studies for the mass balance of glaciers and ice sheets. By providing a time snapshot of glacier geometry, DEMs are crucial for most glacier evolution modelling studies, but are also important for cryospheric modelling in general. We present a historical medium-resolution DEM and orthophotographs that consistently cover the entire surroundings and margins of the Greenland Ice Sheet 1978-1987. About 3,500 aerial photographs of Greenland are combined with field surveyed geodetic ground control to produce a 25 m gridded DEM and a 2 m black-and-white digital orthophotograph. Supporting data consist of a reliability mask and a photo footprint coverage with recording dates. Through one internal and two external validation tests, this DEM shows an accuracy better than 10 m horizontally and 6 m vertically while the precision is better than 4 m. This dataset proved successful for topographical mapping and geodetic mass balance. Other uses include control and calibration of remotely sensed data such as imagery or InSAR velocity maps.

No MeSH data available.


Related in: MedlinePlus

Magnitude and direction of the co-registration.There is some spatial consistency of the vertical adjustments between the aerophotogrammetric DEM and ICESat, which is likely to be related to the density of the original input ground control that is used to constrain the aerotriangulation during the adjustment of the photogrammetric model.
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f7: Magnitude and direction of the co-registration.There is some spatial consistency of the vertical adjustments between the aerophotogrammetric DEM and ICESat, which is likely to be related to the density of the original input ground control that is used to constrain the aerotriangulation during the adjustment of the photogrammetric model.

Mentions: We plot the direction and magnitude of the co-registration vectors in Fig. 7. Vectors greater than 25 m plot along the coast or the ice margin, and are characterized by small sample sizes. Regional systematic error is apparent everywhere, but smaller and far less pronounced in the west and the south, where the ground control has the highest density. As density decrease, the ground control becomes more sensitive to the ability to identify them in the photographs and error on the coordinates, resulting in the larger magnitude and more regionalized pattern.


Digital elevation model and orthophotographs of Greenland based on aerial photographs from 1978-1987.

Korsgaard NJ, Nuth C, Khan SA, Kjeldsen KK, Bjørk AA, Schomacker A, Kjær KH - Sci Data (2016)

Magnitude and direction of the co-registration.There is some spatial consistency of the vertical adjustments between the aerophotogrammetric DEM and ICESat, which is likely to be related to the density of the original input ground control that is used to constrain the aerotriangulation during the adjustment of the photogrammetric model.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4862325&req=5

f7: Magnitude and direction of the co-registration.There is some spatial consistency of the vertical adjustments between the aerophotogrammetric DEM and ICESat, which is likely to be related to the density of the original input ground control that is used to constrain the aerotriangulation during the adjustment of the photogrammetric model.
Mentions: We plot the direction and magnitude of the co-registration vectors in Fig. 7. Vectors greater than 25 m plot along the coast or the ice margin, and are characterized by small sample sizes. Regional systematic error is apparent everywhere, but smaller and far less pronounced in the west and the south, where the ground control has the highest density. As density decrease, the ground control becomes more sensitive to the ability to identify them in the photographs and error on the coordinates, resulting in the larger magnitude and more regionalized pattern.

Bottom Line: Supporting data consist of a reliability mask and a photo footprint coverage with recording dates.Through one internal and two external validation tests, this DEM shows an accuracy better than 10 m horizontally and 6 m vertically while the precision is better than 4 m.This dataset proved successful for topographical mapping and geodetic mass balance.

View Article: PubMed Central - PubMed

Affiliation: Centre for GeoGenetics, Natural History Museum, University of Copenhagen, 1350 Copenhagen, Denmark.

ABSTRACT
Digital Elevation Models (DEMs) play a prominent role in glaciological studies for the mass balance of glaciers and ice sheets. By providing a time snapshot of glacier geometry, DEMs are crucial for most glacier evolution modelling studies, but are also important for cryospheric modelling in general. We present a historical medium-resolution DEM and orthophotographs that consistently cover the entire surroundings and margins of the Greenland Ice Sheet 1978-1987. About 3,500 aerial photographs of Greenland are combined with field surveyed geodetic ground control to produce a 25 m gridded DEM and a 2 m black-and-white digital orthophotograph. Supporting data consist of a reliability mask and a photo footprint coverage with recording dates. Through one internal and two external validation tests, this DEM shows an accuracy better than 10 m horizontally and 6 m vertically while the precision is better than 4 m. This dataset proved successful for topographical mapping and geodetic mass balance. Other uses include control and calibration of remotely sensed data such as imagery or InSAR velocity maps.

No MeSH data available.


Related in: MedlinePlus