Analysis Of Satellite Imagery Data Research Articles

Characterization of the deformation of the Jurassic-Cretaceous deposits of the Toulouk sector (Tim Mersoï basin, North Niger), relation with the uranium mineralizations

The Toulouk sector, located in the Tim Mersoï basin, is a particular area due to the presence of a Horst structure within the vast expanses of the Irhazer mudstones. This structure has shown sub-surface uranium mineralization. This raises the problem of understanding the deformation of this sector as well as the mechanisms that favoured the establishment of these mineralizations. Thus, the approach implemented consisted in: · Filed work, analysis of satellite imagery data, cartographic and logging data, · A correlation of geological and logging data, This approach allowed the establishment of a local lithostratigraphic framework and the visualization of the uranium distribution and copper mineralization in this sector. It appears from this work that the Toulouk sector would be subjected to an extensive synsedimentary phase that would have favored a structuring in horst and half-graben. The latter would have favored the development of several tectonic structures. These served as drains for the mineralizing fluids.

Pemetaan Daerah Potensi Longsor Menggunakan Analisis Fault Fracture Density Pada Data DEMNAS Di Wilayah Cisarua, Kabupaten Bandung Barat, Jawa Barat

The Cisarua area is located in the northern part of Bandung City and is one of the sub-districts in West Bandung Regency and has steep topography in several locations, giving rise to the potential for landslides. The eastern region is part of the Lembang Fault which is still active in the North Bandung area. The potential for landslides related to the geological structure in this area can be identified by looking at the lineament patterns of the valleys, the presence of lithological offsets and others. The geological structure that developed in the Cisarua area was identified based on the results of analysis of satellite imagery data and the National Digital Elevation Model (DEMNAS) to identify the presence of geological structures and determine the direction of the dominant force. This study aims to determine the distribution of potential landslides in the Cisarua area using the Fault Fracture Density (FFD) method. Linearity analysis is estimated using the Fault Fracture Density (FFD) method. This method produces an analysis based on the straightness of the ridges and valleys around Cisarua which is then processed using a rosette diagram and interpreted as the dominant lineament trending west-east and northeast- southwest, this dominant lineament corresponds to the direction of the Lembang Fault. The lineament density level value describes a weak zone in the rock which creates the potential for landslide hazard. The weak zone in red indicates that the study area has a high landslide hazard potential, which is red, and the light green color indicates that the study area has a low landslide hazard potential. The potential for landslides in the study area is spread more in areas close to regional geological structures such as faults when compared to other areas. This pattern indicates that the presence of geological structures has an influence on the occurrence of landslides in potential areas.

Estimation of the level of eutrophication of coastal waters of the Baltic Sea on the basis of Earth remote sensing data

One of the serious environmental problems is the eutrophication of water bodies, so monitoring of this process is necessary. The purpose of the study is to assess the level of eutrophication of coastal waters based on the analysis of satellite imagery data using NDVI. The NDVI value and the water area where NDVI is greater than zero were used as indicators of eutrophication. The study was carried out in the Gdansk and Kaliningrad bays of the Baltic Sea. Computer processing of images in .tif (NDVI) and .png (RGB images) formats from satellites of the Sentinel-2 and Landsat family for 2013-2021 was performed. As a result of the study, it was found that the calculation of the NVDI index and the area where this index is greater than zero is an adequate method for monitoring eutrophication, since it demonstrates areas of the water area where a high level of vegetation is observed. Compared to the calculation of chlorophyll content indices (which are very difficult to establish standard values), the calculation of NDVI is easier to interpret. The study shows that the level of eutrophication in the bays of the Baltic Sea depends on seasonality, it usually increases from May to August, and decreases in September. Annual fluctuations are also observed, in particular, a decrease in eutrophication in 2020-2021 due to the decline in economic activity and anthropogenic pollution. Sharp and rapid increases in the level of eutrophication were found, but in the study period, the ecosystems of the bays were capable of self-healing.

ANALISIS BANJIR BANDANG DENGAN MENGGUNAKAN DATA CITRA SATELIT DI KABUPATEN LUWU UTARA (STUDI KASUS 13 JULI 2020)

Flash floods that hit parts of South Sulawesi on July 13, 2020, left 36 people dead, 18 people lost, 40 people missing, 58 injured, and a total of 14,483 people were affected. Around 14,000 people were evacuated to safer locations due to not having a home to live in. The disaster was caused by heavy rains. One of the areas affected was North Luwu. This phenomenon needs to be done research so that people can overcome the possibility of disasters that might occur. Air pressure and air temperature for 2 days before the occurrence of flash floods have the same relative patterns and anomalies occurred on the day of the incident. This research uses satellite image data interpretation method by processing the Himawari-8 infrared channel data and compared with rainfall data from the Andi Jemma meteorological station in North Luwu Regency on July 13, 2020. Interpretation and analysis of satellite imagery data shows the growth of strong convective clouds has the potential to cause rain in North Luwu around 07.00 UTC. So it was concluded that during a flash flood, unstable atmospheric conditions and the presence of Cumulonimbus (CB) cloud cover in the North Luwu region.

Tracking Changes in Mining Object Topology on Rectangular and Hexagonal Grids

The Earth remote sensing technologies (ERS) in exploration largely determine their effectiveness. Therefore, development of a new methodological support for the use of remote sensing data in predicting mining and geological conditions is a key priority area. The studies are based on the analysis of the assessment of information, social, and economic efficiency of remote sensing data application at mineral deposits. The role of application of new technologies (including remote ones) in the process of optimizing initial exploration stages is noted. The possibilities of using remote sensing data to assess general nature, direction, and extent of environmental changes due to mining activities are shown. A technique is proposed that can be used in the process of tracking changes in the topology of objects in the course of mining. The differences in the results obtained using the proposed technique for processing satellite images on rectangular and hexagonal grids (rasters) are considered. The advantages of using the hexagonal grid for tracking the boundaries of objects and formation of signs are shown. Practical examples - a number of open source satellite images processed using the proposed method - are presented. The study findings allow applying intelligent analysis of satellite imagery data with the subsequent identification of the earth's surface objects of interest. An example of using the obtained results together with specialized software tools (such as GIS INTEGRO geographic information system capable of solving geological problems, or the foreign ArcGIS system) for constructing contour maps of the territory and obtaining its description based on topological relations and metric information is shown.

Analysis of Impact of Tropical Cyclone Blance on Rainfall at Kupang Region Based on Atmospheric Condition and Satellite Imagery

The Tropical Depression previously identified on March 3, 2017, at Arafuru Sea has grown to Tropical Cyclone Blance on March 5, 2017. The existence of Tropical Cyclone Blance gave impacts like increasing rainfall for some regions in Indonesia until March 7, 2017, such as Kupang. The increase of rainfall cannot be separated from the atmospheric dynamics related to convection processes and the formation of clouds. Analysis of weather parameters is made such as vorticity to observe vertical motion over the study area, vertical velocity to see the speed of lift force in the atmosphere, wind to see patterns of air mass distribution and rainfall to see the increase of rainfall compared to several days before the cyclone. Analysis of satellite imagery data is used as supporting analysis to see clouds imagery and movement direction of the cyclone. The results of weather parameters analysis show strong vorticity and lift force of air mass support the growth of Cumulonimbus clouds, cyclonic patterns on wind streamline and significant increase of rainfall compared to previous days. The results of satellite imagery analysis show the convective clouds over Kupang and surrounding areas when this phenomena and cyclone pattern moved down from Arafuru Sea towards the western part of Australia.

Impacts and Adaptation to Climate Change: A Case Study of Coastal Inundation at Proboliunggo, East-Java

The vulnerability of communities in coastal areas continues to increase in the face of climate change. The increasing rainfall in one place and droughts elsewhere, high waves and strong ocean winds are real phenomena indicative of climate change. Increasing symptoms of climate change at the same time as a high tide can cause widespread coastal inundation. This can interfere with food security, livelihoods and environmental sustainability (including bio-diversity), and threaten coastal infrastructure. The purpose of this study was to study the impact of climate change and the adaptation and mitigation done by coastal communities in the face of it. The method of this study is the analysis of satellite imagery data, interviews and analysis of the productive land. The results of this study show the occurrence of irregularities such as increased rainfall in 2010, during the period 2002-2011; how flood tides in coastal areas can damage productive land (fish ponds), and submerge residences, public facilities and infrastructure. In Kalibuntu there was flooding to an average water depth of 110 cm over 87.84 Ha for 4-4.5 hours. Coastal communities adapted by raising the ground floor of their houses about 0.5-1 meters and switching to other kinds of job. Flood mitigation involved building a seawall of stacked stone in a trapezoidal shape with groins extending in to the sea. This design has strong resistance and has proven durable. In addition to physical prevention efforts, biological precautions, especially mangrove reforestation, are necessary.

Exploration Applications of Satellite Imagery in Mature Basins--A Summation

A series of examples supported by surface and subsurface controls illustrates procedures used to integrate satellite imagery interpretation into a conventional exploration program, and the potential contribution of such an approach to the recognition of new hydrocarbon plays in mature basins. Integrated analysis of satellite imagery data consists of four major steps. The first step focuses on the recognition of style, trend, and timing of deformation of exposed structures located at the basin interior or around its margins. This information is obtained through an integrated analysis of satellite imagery data, stereo aerial photography, surface geological mapping, and field observations. The second step consists of integrating the satellite imagery with gravity and magnetic data to recognize obscured and/or buried structures. The third step involves the analysis of available seismic data which is specifically processes to enhance subtle basement topography in order to determine influences on reservoir quality. In the fourth step, subsurface structure, isopach, show, and pool maps derived from available well information are integrated into the structural interpretation. These four analytical steps are demonstrated with examples form the Powder River basin, Western Canada basin, Paris basin, and Central basin platform of west Texas. In all of these highly mature basins,more » it is easy to demonstrate that (1) hydrocarbon migration and accumulation was largely controlled by subtle basement structures, and (2) these structures can be detected through the integrated analysis of satellite imagery.« less