What is the correlation of lineaments with landslides?4 answersLineaments have a correlation with landslides, as indicated by multiple studies. The presence of lineaments is associated with higher frequency of landslides in general. Lineament analysis can be used to assess the control of lineaments on landslide occurrences and to analyze the tectonics of a terrain. Areas near lineaments tend to experience a higher density of landslides. However, it is important to note that lineaments are not the only factor influencing landslide density. Other parameters such as slope and lithology also play a role in determining the spatial distribution of landslides. The intersection of lineaments and landslides has been observed in various studies, indicating a direct association between the two. The density of lineaments can be used to quantify their influence on landslide occurrences, with higher lineament density corresponding to a higher number of landslides.
How to detect sand mining through Remote Sensing?4 answersSand mining can be detected through remote sensing using various methods. One approach is to utilize multi-spectral images to identify the spectral signature of river sandbank regions, which are characterized by the association with a river stream and the abundance of minerals. Another method involves using high-resolution remote sensing, such as the Sentinel-1 mission, to monitor sand mining in fluvial systems. This system can detect sand mining by barges almost in real-time with satisfactory accuracy. Additionally, the integration of unmanned aerial vehicle (UAV) remote sensing technology with modern survey instruments like differential global positioning system (DGPS) can provide a more efficient and cost-effective way to monitor sand quarry sites and calculate the volume of sand extracted. These remote sensing techniques enable the detection and monitoring of sand mining activities, contributing to the assessment of their impact on the environment and infrastructure.
What is lineaments?5 answersLineaments are linear structures on the Earth's surface that represent various geological features such as fault zones, fracture zones, lithological contacts, tectonic boundaries, and Quaternary structures. They can be identified through lineament interpretation, which is the first step in assessing the structure of a crystalline bedrock setting. Lineaments can be extracted using remote sensing techniques and software tools like ArcGIS and Rockworks. They are important for scientific research and can be used to accurately determine the location of geological features. Lineament extraction can also aid in decision-making for the implantation of boreholes and drilling in basement zones. The orientation and density of lineaments can be analyzed and mapped using software tools like Excel, ARMAP, and PCI Geomatica. Lineaments extracted from satellite data can provide valuable information for geological and mining prospecting.
How can remote sensing be used to detect drought conditions in arid regions?5 answersRemote sensing techniques can be used to detect drought conditions in arid regions. These techniques involve the use of satellite images and remote sensing indicators to monitor and assess drought. The indicators commonly used include the Normalized Difference Vegetation Index (NDVI), Vegetation Condition Index (VCI), Temperature Condition Index (TCI), and Vegetation Health Index (VHI). By analyzing these indicators, researchers can identify areas experiencing drought and track changes in drought severity over time. Additionally, remote sensing can be combined with geographic information systems (GIS) to monitor and detect droughts in specific regions, such as steppe regions. The application of remote sensing in drought monitoring has been demonstrated in various countries, including Iran, Bulgaria, and Jordan. Overall, remote sensing provides a valuable tool for detecting and monitoring drought conditions in arid regions, contributing to effective drought management and planning.
How satellite images be used to detect faults in geology?5 answersSatellite images can be used to detect faults in geology by analyzing the data collected from these images. One approach is to use remote sensing monitoring to detect exogenous processes such as landslides and collapses. Another method is to apply satellite radar interferometry to detect co-seismic deformations and pre-earthquake deformations. Additionally, satellite thermal infra-red data can be used to identify thermal anomalies on the Earth's surface prior to earthquakes. Furthermore, satellite gravimetry has shown impressive results in detecting ground movement associated with earthquakes. These various satellite methods provide valuable information for fault detection in geology and contribute to our understanding of seismic activity.
How to process sentinenl1 for lineaments extraction?5 answersSentinel-1 data can be processed for lineament extraction using various methods. One approach is to use an improved segment tracing algorithm (STA) to interpret lineaments from remote sensing data (DEM). Another method involves automatically extracting lineaments by detecting linear changes in gradation on a picture and making the sensitivity of detection dependent on direction. Additionally, a line segment extracting method can be used, which involves projecting light onto an object, obtaining a data point set, preprocessing the data points, classifying and fitting the data points, and determining valid results. Image processing techniques applied to Landsat ETM+, ERS-2 SAR, and DEM data have also been used to extract and map geological lineaments. Finally, a laser line stripe edge extraction method has been developed, which involves positioning the upper and lower edges of each column through acquiring the larger value of the position corresponding to each column of masks in an enhanced image.