Zobrazeno 1 - 10
of 27
pro vyhledávání: '"J. Karvo"'
Publikováno v:
The Cryosphere, Vol 16, Pp 1821-1844 (2022)
We present a method to combine CryoSat-2 (CS2) radar altimeter and Sentinel-1 synthetic aperture radar (SAR) data to obtain sea ice thickness (SIT) estimates for the Barents and Kara seas. From the viewpoint of tactical navigation, along-track altime
Externí odkaz:
https://doaj.org/article/8683410ac8ca475c8f50f838f0827d19
Autor:
J. Karvonen
Publikováno v:
The Cryosphere, Vol 12, Pp 2595-2607 (2018)
Here a method for estimating the land-fast ice (LFI) extent from dual-polarized Sentinel-1 SAR mosaics of an Arctic study area over the Kara and Barents seas is presented. The method is based on temporal cross-correlation between adjacent daily SA
Externí odkaz:
https://doaj.org/article/b3d92d915265445c9c956e158baeff4e
Publikováno v:
The Cryosphere, Vol 12, Pp 343-364 (2018)
For ship navigation in the Baltic Sea ice, parameters such as ice edge, ice concentration, ice thickness and degree of ridging are usually reported daily in manually prepared ice charts. These charts provide icebreakers with essential information
Externí odkaz:
https://doaj.org/article/7147eae9dab54f0a83fa90164cef49c8
Autor:
J. Karvonen
Publikováno v:
The Cryosphere, Vol 10, Iss 1, Pp 29-42 (2016)
Here we present an algorithm for continuous ice drift estimation based on coastal and ship radar data. The ice drift is estimated for automatically selected ice targets in the images. These targets are here called virtual buoys (VBs) and are tracked
Externí odkaz:
https://doaj.org/article/f35b051fc9cb440b876c70f481f0e33d
Publikováno v:
The Cryosphere, Vol 9, Iss 1, Pp 357-366 (2015)
Pairs of consecutive C-band synthetic-aperture radar (SAR) images are routinely used for sea ice motion estimation. The L-band radar has a fundamentally different character, as its longer wavelength penetrates deeper into sea ice. L-band SAR provides
Externí odkaz:
https://doaj.org/article/af09bb62953f4e93819b464417c982da
Autor:
J. Karvonen
Publikováno v:
Horticultural Science, Vol 41, Iss 3, Pp 147-151 (2014)
Of the grapevines grown in the Nordic countries, cv. Zilga, bred in Latvia, has proven to be very winter resistant and fast-maturing, and produces abundant harvests. In Finland, it is grown as horticultural and agricultural plant unprotected on open
Externí odkaz:
https://doaj.org/article/2fba3fbc651a426982649bf06bf1554c
Autor:
J. Karvonen
Publikováno v:
The Cryosphere, Vol 8, Iss 5, Pp 1639-1650 (2014)
We have studied the possibility of combining the high-resolution synthetic aperture radar (SAR) segmentation and ice concentration estimated by radiometer brightness temperatures. Here we present an algorithm for mapping a radiometer-based concent
Externí odkaz:
https://doaj.org/article/4a1f64593114442991b0c57b9ddbb87a
Publikováno v:
The Cryosphere, Vol 6, Iss 6, Pp 1507-1526 (2012)
An analysis of ice thickness distribution is a challenge, particularly in a seasonal sea ice zone with a strongly dynamic ice motion field, such as the Gulf of St. Lawrence off Canada. We present a novel automated method for ice concentration and thi
Externí odkaz:
https://doaj.org/article/6d24fe97a8a747a888b07c1930c10f6e
Autor:
J. Karvonen
Publikováno v:
Ocean Science, Vol 8, Iss 4, Pp 473-483 (2012)
An algorithm for computing ice drift from pairs of synthetic aperture radar (SAR) images covering a common area has been developed at FMI. The algorithm has been developed based on the C-band SAR data over the Baltic Sea. It is based on phase correla
Externí odkaz:
https://doaj.org/article/30c2eb462e0c4ff1981bfaf5a60ad3af
Autor:
M. R. Julien, M. Piekkari, T. Lépine, J. Saukkoriipi, P. Lavoie, E. Masengo, J. Karvo, J. Nousiainen
Publikováno v:
Sustainable and Safe Dams Around the World ISBN: 9780429319778
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f3115ff321dcbaf0535830b3ee2c0d85
https://doi.org/10.1201/9780429319778-306
https://doi.org/10.1201/9780429319778-306
