Aleksey Sharov

Joanneum Research Forschungsgesellschaft mbH · DIGITAL – Institute for Information and Communication Technologies

Fifteen years ago we carried out dGPS field surveys and mapped surface changes in the Hornbreen-Hambergbreen (H-H) icy isthmus, also known as Mendeleev Plain in South Spitsbergen, Svalbard, using satellite interferometry (ERS-1/2) and altimetry (ICESat) data. Local vertical movements with amplitudes of a few cm per day, measured on the flat and smo...

The present paper proposes an advanced observation technology for the airport runway monitoring service (RMS) based on the complementary use of interferometric SAR data from Sentinel-1-A/B satellites, hydrometeorological observations and ground geotechnical surveys. We investigate the suitability and technical feasibility of using satellite dual-se...

The availability and quality of relevant hydrometeorological data remains a decisive factor for estimating, forecasting and compensating weather-related errors in the satellite interferometric monitoring of slow ground deformations with typical rates of several mm/a. Modern airports with paved runways are supplied with thorough meteorological infor...

Random variations of local weather represent the main limiting factor for practical applications of persistent scatterer interferometry (PSI) at the sub-regional level. 190 Sentinel-1 IW SAR scenes taken over European airfields of Vienna, Bratislava, Graz and Longyearbyen, and timely data recorded at airport meteorological stations were used for th...

Three-year-long Sentinel-1-A/B IW SAR time series and timely data recorded at airport meteorological stations were used for the sub-regional analysis of weather-related impacts on the performance of persistent scatterer SAR interferometry (PSI) in European airfields of Longyearbyen, Vienna, Bratislava and Graz. An original correction technique of “...

Meltdown of Ice Bridges and Emergence of New Islands in the Barents-Kara Region Observed by Sentinel-1 INSAR Aleksey Sharov1, Dmitry Nikolskiy2 1JOANNEUM RESEARCH, Austria; 2Sovzond, Russian Federation Natural ice bridges formed by glaciers stretching across water bodies and connecting isolated tracts of land to the mainland belong to relatively un...

The present investigation was aimed at studying spatial variability and directional dynamics of inland ice/snow fields in relation to lateral variations of surface gravity at the sub-regional scale of tens to hundreds of kilometres. The main goal was to evidence, both theoretically and empirically, the existence and significance of gravitational im...

ERS, TDX and S1A SAR interferometric models calibrated with ICESat and CryoSat-2 altimetry data were successfully applied to mapping and quantifying recent breakup of the Matusevich Ice Shelf in Severnaya Zemlya. The assessment of the mapped changes showed that the ice shelf lost 123±2.5 km² or two thirds of its area and 9±0.3 km³ of its volume in...

Algorithmic variations to the glacier motion estimation from differential SAR interferometry are discussed in the present paper. Two efficient albeit relatively simple algorithms for modelling glacier dynamics using spaceborne INSAR data have been devised and tested as alternatives to the conventional DINSAR approach. Neither of the algorithms invo...

Mass balance of Russia's northernmost ice caps is poorly known and scarcely mapped. Thorough information about glacier fluctuations in the outer periphery of Russian shelf seas is both lacking and highly desired since it may constitute the relevant benchmark for judging and projecting climate change impacts in the entire Arctic. The present study i...

All known glaciological models describing the evolution of Arctic land- and sea-ice masses in changing climate treat the Earth's gravity as horizontally constant, but it isn't. In the High Arctic, the strength of the gravitational field varies considerably across even short distances under the influence of a density gradient, and the magnitude of f...

Dear readers, friends and colleagues, the booklet you hold in your hands is the result of longterm efforts, thoughts and aspirations. It is the combined work of a group of nine scientists, six Austrians and three Russians, some young and some older, men and women, all engaged in the study of glacioclimatic variations and their influence on mankind....

The overall mapping of glacier elevation changes, the integral geodetic estimation of mass balance and the factor analysis of mutual variations in land and sea ice cover in the Barents-Kara region (BKR), Eurasian Arctic addressed in this paper were performed using a synergetic combination of differential interferometry and altimetry. Careful statis...

Within the frame of project ICEAGE (Modeling snow-ice cover evolution and associated gravitational effects with GOCE constraints) a numerical approach to gravity forward modeling has been designed and applied to investigate the impact of glacier changes on the local gravity field. Furthermore, the contribution and applicability of GOCE gravity grad...

The main objective of the research project ICEAGE is to determine, interprete and map the present state of snow and ice cover as well as its variations in the Eurasian Arctic Sector about 31° to 81° East and 73° to 82° North. The investigations are based on terrestrial, space-borne interferometric, altimetric, and gravity field data. Special emphas...

In the 1950s, the total area of glaciers occupying separate islands and archipelagos of the Barents and Kara seas exceeded 92,300 km² (Atlas of the Arctic 1985). The overall glacier volume reached 20,140 km³ and the average ice thickness was given as 218 m. Our recent remote sensing studies and mass-balance estimates using spaceborne ASTER and LAND...

The aim of the project ICEAGE is determining, interpreting and mapping the present state and fluctuations of snow and ice resources in the Eurasian Arctic Sector about 31° to 81° east and 73° to 82° north, based on terrestrial, space-borne interferometric, altimetric, and gravity field data. Special emphasis shall be given to estimating the impact...

Offset fields between pairs of JERS-1 satellite SAR data acquired in winter with 44 days time interval were employed for the estimation of Arctic glacier motion over Svalbard, Novaya Zemlya and Franz-Josef Land. The displacement maps show that the ice caps are divided into a number of clearly defined fast-flowing units with displacement larger than...

A combination of satellite interferometry and altimetry was used for generating and upgrading elevation and evolution models of the Northern Glacial Complex in Novaya Zemlya, measuring heights of ice divides and ice coasts, detecting, measuring, interpreting and mapping glacier changes in linear, areal and volumetric terms, and estimating glacier m...

You will not find the name Hornsundet in existing maps. This invented toponym refers to a hypothetical sub-glacial strait between Torell and Sörkapp lands in South Spitsbergen, Norwegian High Arctic. A relatively low and flat ice isthmus formed by Hornbreen and Hambergbreen tidewater glaciers is currently bridging the two lands. In the narrowest pa...

L-band SAR interferometry and offset tracking were applied for the estimation of arctic glacier motion over Franz Josef Land, Novaya Zemlya and Svalbard using SAR data acquired by the JERS-1 satellite with 44 days time interval. Our SAR interferometric results indicate a generally good coherence with well preserved fringes over the slow moving glac...

An original approach to geocoding and interpreting glacier interferograms with altimetric and photogrammetric constraints was designed and tested. New results demonstrating considerable glacier changes in South Svalbard were obtained through the joint analysis of ERS-1/2-SAR interferograms, ICESat-GLAS altimetry data and ASTER-VNIR imagery obtained...

The present extent of European ice coasts, their spatial changes in the past 50years and the velocities of ice flow in marginal parts of tidewater glaciers were determined and mapped at a regional scale using space-borne image data, both optical and radar. The methods of satellite photogrammetry and radar interferometry provided efficient solutions...

The theory of elastic deformation and the energy conservation principle were applied to simplified rheological modelling of large European tidewater glaciers using the interferometric and altimetric data obtained from the European ERS and American ICESat satellites. Several questions concerning the co-registration, joint interpretation and physical...

This paper proposes an original concept for the complementary use of satellite interferometry and altimetry aimed at generating, geocoding and mosaicking equivalent morphological and rheological models of large European tidewater glaciers (TWGs). Basic methodological aspects and potential glaciological applications, including glacier change detecti...

Methodological design and technical performance of an original phase gradient approach to glacier rheological modelling and mapping will be discussed and several practical examples of utilising multi-pass ERS-1/2 SAR interferograms in different European glacial environments will be given.

This paper describes the development and testing of an original gradient approach (GINSAR) to the reconstruction of glacial morphology and ice motion estimation from the interferometric phase gradient that does not involve the procedure of interferometric phase unwrapping, thus excluding areal error propagation and improving the modelling accuracy....

An original phase gradient approach to glacier rheological modelling and mapping from repeat pass SAR interferograms was devised, programmed, tested and validated in different glacier environments. The underlying concept, basic algorithms, processional singularities and the information contents of our value-added interferometric products were analy...

Satellite radar interferometry (INSAR) offers a particularly potent means for conducting glaciologi-cal studies in polar regions. We successfully used ERS-1/2 INSAR data obtained in winter 1996 for studying glacier dynamics in the high-latitudinal archipelago of Nova ya Zemlya. Two efficient albeit relatively simple algorithms for modeling glacier...

Several approaches to spaceborne interferometric data analysis including interferogram differencing technique and joint processing of ERS-1/2 interferometric data and spaceborne stereoscopic photographs have been investigated and practically applied for topographic modeling of several high-latitudinal islands in the Russian High Arctic. Some specif...

The cost-efficiency of photogrammetric mapping by means of spaceborne stereophotographs heavily depends on the geometric quality of the image. Geometric properties are usually inhomogeneous over the image area and very often only a part of the satellite image is used for practical cartography. In many cases digital image processing under large magn...

Multitemporal spaceborne and aerial image data as well as cartographic and historical materials about Franz Josef Land archipelago published since 1874 were acquired and jointly analyzed. Complex of photogrammetric and cartographic investigations was carried out being based on remote sensing data and supported by field direct measurements in test a...

Multitemporal spaceborne and aerial image data as well as cartographic and historical materials about Franz Josef Land archipelago published since 1874 were acquired and jointly analyzed. Complex of photogrammetric and cartographic investigations was carried out being based on remote sensing data and supported by field direct measurements in test a...

In this paper, the ability of GOCE gravity gradient observations for refining regional geoid solutions is investigated for a restricted area of interest using Least Squares Collocation (LSC). GOCE data from November 2009, reflecting the medium wavelength signal part of the gravity field, are combined with terrestrial gravity anomalies simulated fro...

The overall mapping of glacier elevation changes, the integral geodetic estimation of mass balance and the factor analysis of mutual variations in land and sea ice cover in the Barents-Kara region (BKR), Eurasian Arctic addressed in this paper were performed using a synergetic combination of differential interferometry and altimetry. Careful statis...

The combination of satellite differential radar interferometry (DINSAR) and altimetry was successfully applied to the overall geometric modelling of glacier elevation changes in Severnaya Zemlya in the period from the 1980s to the 2000s. The 2-pass DINSAR orthomosaic composed of 12 ascending ERS-1/2 tandem SAR interferograms covering the entire arc...

Two original alternative techniques have been offered for the precise modelling of ice shores and the ice-motion estimation for large outlet glaciers in the Western Russian Arctic using tide-coordinated ERS-1/2-INSAR data. Speed and simplicity of implementation are important features of the proposed techniques, which make use of single interferogra...

Ice mass and glacier changes are often observed using geometrical methods. In this paper, a different approach is presented: by investigating the gravitational effects linked to such muss changes, satellite gravity missions like GOCE can be seen as global monitoring instruments for the cryosphere. This work compares synthetic gravity fields of Nova...