Tracing dynamics of relative volumetric soil moisture content using SAR data

Avetisyan, Daniela; Velizarova, Emiliya; Nedkov, Roumen

doi:10.1117/12.2277506

Cited by 6 publications

(5 citation statements)

References 13 publications

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“…Only where there is a strong change in the territories, values up to 1 unit or the places colored in red can be seen. From the images thus made the strongest dynamics are observed in the region of Plovdiv and Pernik, where NDGI has the most values around +1 (one) 30,31 . The index can be used to analyze urbanized and non-urbanized areas.…”

Section: Resultsmentioning

confidence: 96%

Assessment of heat islands in different economic regions of Bulgaria for the needs of digital twins

Spasova

2023

Remote Sensing Technologies and Applications in Urban Environments VIII

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Section: Resultsmentioning

confidence: 96%

Assessment of heat islands in different economic regions of Bulgaria for the needs of digital twins

Spasova

2023

Remote Sensing Technologies and Applications in Urban Environments VIII

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“…The same profiles are transferred to the Merge image (figure 9). Transforming the SAR image into dB has already proven its effectiveness (figure 10), since dB is a logarithmic quantity with particularly high accuracy and clear values for surfaces 36 , but after removing speckle.…”

Section: Resultsmentioning

confidence: 99%

Assessment of monitoring and security on the Black Sea coast by remote sensing and open data

Spasova

2022

Remote Sensing of the Ocean, Sea Ice, Coastal Waters, and Large Water Regions 2022

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Interoperability of data from different sources is the main purpose of this study. The survey covers the waters of the Black Sea in Bulgaria. Our country has a maritime border of 378 km, of strategic importance and is close to military conflicts (e.g. Ukraine). The use of different satellite and in situ data in hybrid models makes it possible to obtain much more information from one point or area of interest. Different satellite data have been used, which are collated with registers of open and spatial data from the Bulgarian Open Data Portal. Much of the ground information is extremely rich in detailed information on the chemical, environmental and climate status of the specific point or area of interest. The survey uses Copernicus data, Landsat, the Open Data Portal, the Black Sea Basin Directorate and Innovative Techniques and Methods for Reducing Marine Litter in the Black Sea Coastal Areas -(BSB552 RedMarLitter and etc. These interoperable data will be useful for coastal protection and security, environmental monitoring and adequate decisionmaking in the administration, business and various other groups of data users. The methodology aims to support work on Digital Twins of the Earth. Information from so many sources will at one point lead to a much more effective and efficient management of territories in the event of environmental disasters (e.g. plastic and oil pollution), various military conflicts and their consequences, as well as annual monitoring of tourist areas and many others.

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“…,where σ is the microwave reflectance coefficient for time instant t1 (satellite image of earlier date ) and for time instant (satellite image of later date ), i, j are the row and column numbers of pixels in a given SAR image, and r is the relative soil moisture content reported for the corresponding period between two images of one polarization. This mathematical approach was used between four images over a period of about a month, showing promising results in identifying areas of moderate and high change in vegetation, wet snow, ice, and water 13 . The values above 2 register serious changes in the reflectance of a given object in selected areas, and low values below 1.0 indicate little or no change in an object's reflectance.…”

Section: Modifiedmentioning

confidence: 99%

“…The availability of ground-based data in addition allows effective and cost-effective monitoring of climate change in remote areas using SAR data. The SAR C-band enables the effective study of various objects [5][6][7][8][9][10][11][12][13][14][15] and especially wet snow and ice 3,4,[16][17][18][19] . Using SAR data, we studied the type of changes in the digital value of the reflected signal (Q) from various objects, including water in different phase states.…”

Section: Introductionmentioning

confidence: 99%

A synchronized remote sensing monitoring approach in the Livingstone island region of Antarctica

Spasova,

Avetisyan

2023

Ninth International Conference on Remote Sensing and Geoinformation of the Environment (RSCy2023)

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Data-driven innovations bring significant benefits to societies directly affected by global warming, as they underpin Global and European climate change policy. The application of a synchronous approach and interoperability of data from different sources for environmental monitoring in one of the most vulnerable to climate change regions in the World is the aim of this research. The research was conducted at Hannah Point peninsula, near the Bulgarian Antarctic base "St. Kliment Ohridski" on Livingstone Island, South Shetland Islands, Antarctica. The study area has high ecological importance for tracking the dynamics of processes not only on a local but also on a global scale. Various research sites with different groups of objects serving as environmental benchmarks were selected to be studied. The study objects include snow cover, wet snow, water, ice (including sea ice), herbaceous vegetation, lichens, mosses, soils, and sand. For each of the objects, ground GPS points were defined and in situ spectrometric measurements were performed. Data from an innovative automatic recording weather station (AWG), as well as various indicators and indices based on the spectral reflectance characteristics of the investigated objects in the optical and microwave range, were used. For their generation were used satellite images from Sentinel-1 and Sentinel-2 sensors of European Space Agency. Multiple optical indices were used to demonstrate the changes in the state of the objects for the summer season of 2022-2023. The data obtained and models used will serve the Bulgarian initiative for the construction of the Digital Twins, which is being on pilot developed in the Department of Aerospace Information (SRTI-BAS) and could be used by a wide range of scientists in the field of polar research as well as for climate change education. Open Data were used in this study, to promote the Open science policy and FAIR principles as much as possible.

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Tracing dynamics of relative volumetric soil moisture content using SAR data

Cited by 6 publications

References 13 publications

Assessment of heat islands in different economic regions of Bulgaria for the needs of digital twins

Assessment of heat islands in different economic regions of Bulgaria for the needs of digital twins

Assessment of monitoring and security on the Black Sea coast by remote sensing and open data

A synchronized remote sensing monitoring approach in the Livingstone island region of Antarctica

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