جستجوی مقالات مرتبط با کلیدواژه « سنجش از دور » در نشریات گروه « میان رشته ای »

The Surmaq region on the northeastern margin of the Zagros Orogenic Belt, which was chosen as the research area, includes a significant expansion of fractures and important mines, which seems to be related. Structurally, the Surmaq region is located in the central part of the Sanandaj-Sirjan zone and close to the Main Zagros Thrust. The use of remote sensing techniques, including 1-various false color combinations in order to highlight the lineaments as well as possible and identify the fault patterns and 2-false color combinations along with band ratios in addition to analysis the principle components in order to identify different alteration zones for manganese deposits identifications, provide valuable information about the relation between the alteration zones and the fault patterns. Study of the fault patterns using satellite images as well as their control in field studies showed four general directions. The map of faults density and structural nodes were prepared for identifying mineralization. Based on the Fry analysis of structural nodes, the convergence direction was obtained about NE-SW (040-220). Comparing the pattern of fault density, mineralization, and alteration zones with each other helped to identify areas with mineralization grades. In places where extensional faults intersect with other faults, especially longitudinal basement faults, more suitable places have been formed for mineralization and mineral replacement. Mineral indices with high density and richness are mostly concentrated in the fractured area of the faults and mostly in connection with the Abadeh and Surmaq faults and the junction with the N-S-trending Gashar Fault.

Finding the best possible scheduling to maximize observations and transfer them to the ground station is very important as a function of satellite characteristics, orbital mechanics, attitude control system, field of view and observational objectives. The combination of the agility of the satellite with regard to the ability to quick maneuver along the three axes of roll, pitch and yaw, with a suitable software can significantly improve the response rate, revisit time and satellite coverage. In this regard, the design of a comprehensive scheduling that automatically creates an optimal operational sequence for the maximum utilization of agile Earth observation satellites during a certain period of time in order to respond to the needs and priorities of the users and to satisfy the operational limitations of the satellites. Therefore, in this article, the design of an automatic software for scheduling Earth observation satellites is presented, which after receiving observation targets from the user and assigning observation priority to each task, the ability to implement and execute observation tasks is checked by the attitude control subsystem to satisfy the attitude maneuver limit around the roll and pitch axes and orbital mechanics subsystem to satisfy the target access time window limit. With the help of supervisory control, constraints are applied to the transfer system to add specific features and requirements to the mission., With the help of an optimal search algorithm based on the Bellman-Ford method, the optimal program sequence is obtained for the maximum use of the satellite while meeting the operational limitations of the mission. Finally, A remote sensing mission is simulated to demonstrate the planned verification.

The study area in this research is located in the Central Iran and south of Bayazeh village. Using remote sensing and field studies, the pattern of distribution and evolution of brittle and ductile structures in this part of Central Iran were studied. During remote sensing studies, using different filters, the fracture scattering pattern was investigated. In the field studies section, in order to control and study the faults and folds, structural measurements were performed from different parts of the study area. In the study of folded units, two folding with almost different geometric characteristics were identified that evolved under the influence of NW-SE and E-W convergence directions. Remote sensing and field measurement studies on faults showed three directions of NE-SW, NW-SE and N-S orientations for the main faults in the region. The paleostress field obtained from these studies identified several directions for maximum stress, which with the direction of northwest, northeast, south and east and low to horizontal plunge shows the compressional mechanism prevailing in the region. Hajiabad and Bayazeh faults as the main faults along with minor faults were compared with Riddle fracture pattern and despite the great impact on the spread of faults and folds in the region, it was found that they have not yet reached their structural maturity.

Existence of seismic activity history and high rate of tectonic activity in the region, which indicates that the study area is releasing energy in the pre-seismic stage and as a result in some points of stress accumulation, which will lead to high seismic potential in the future. For this purpose, the active faults of the study area have been drawn and the scatter map of the relative tectonic activity level has been evaluated with instrumental seismic data. Finally, the maximum seismic acceleration of the area has been calculated and the area lines have been obtained by PCA method. After examining the area lines, it was found that lines L1, L2, L3, L4, L5 do not have a counterpart in the aerial magnetic map and therefore are a surface fault. L6 has good compatibility with F-9 magnetic line and surface lines L2, L3, L4, L5 do not have any compatibility with any of the faults exposed in the geological map and magnetic line and their faulting needs to be investigated. It has a desert.

The leaf water content is a specific index for the assessment of the physiological status of the plant based on the water content of the vegetation. This research provides an appropriate model based on the reflectance spectra between 400 and 2500 nm to estimate the leaf water content. We examined 53 different species of the well-known Leaf Optical Properties Experiment and a total of 263 spectral curves were employed in a supervised modelling procedure. In doing so, three different linear models were proposed based on the two different indices and their combination. The first index refers to the ratio of reflectance value in two wavelengths and the second one is the ratio of the derivative of the spectral curve slop in two wavelengths. The experimental results indicate the dependence between the water absorption bands and leaf water content. Finally determination of coefficient for hybrid linear model, which is used both indices, resulted to be 87 percent, indicating a very good fit. Also, the 0.06 relative root mean square error represents the aceptable accuracy in the wáter content modelling.

Considering that the relationship between active tectonics and geomorphology has not been studied in the study area so far; It seems necessary to study the tectonic morphological characteristics in order to identify the impact of active tectonics on the area. In order to study the active tectonics in the study area, the morphometric indices of the catchment such as integral index and meta-measurement curves, catchment asymmetry index, transverse topographic asymmetry index, waterway slope index, mountain front maze index and The elongation ratio is used. In order to establish the relationship between structural elements such as lines, faults and morphometric indices, remote sensing studies such as automatic extraction of lines and fractures and density map of lines have been performed. The study of the risk of surface rupture in Pardis shows that the bed of this city hosts important faults that in the initial studies of this city, geological conditions and construction studies have not been considered. According to the results of the study of relatively active tectonics in the study area, it can be concluded that most of the total area under study is in the category of high tectonic activity due to the performance of faults in the area. Comparison of the density map of the ridges with morphometric indices indicates that the high density areas correspond to the active fronts and the density map of the ridges is a confirmation of the high tectonic activity in these areas.

The study area is located in sheet 1: 100,000 Ghaenat, 15 km east of Ghaen, South Khorasan province. Interpretation of aerial magnetic data and extraction of magnetic lines along with processing of satellite data indicate the orientation of fractures and major structures in three important directions NS NW-SE, and NE-SW in the region, respectively. The The purpose of this study is to investigate the structural elements in the region such as faults, joints, veins, dikes and to determine the characteristics of faults in the region by emphasizing the mineralization potential of faults and to identify promising areas for copper exploration in the region. The application of a compressive-shear regime creates a tensile space followed by the infiltration of mineralized hydrothermal solutions and extensive alterations. With the development of green schist facies in the area, silica and carbonate are released and the cavities are replaced by malachite (copper oxide), which has led to the formation of malachite nodules within andesitic units. The junction of joints and faults in the study area (faults with northwest-southeast direction and joints with northeast-southwest direction) has high grade mineralization.

The study of the fracture systems and their spatial extensions can help in developing oilfields, reducting the costs of exploration and improving overall understanding of the hydrocarbon reservoir systems. In this study, using different tools such as Landsat OLI-8 satellite imagery, remote sensing techniques, by Geomatica and Rockwork softwares, the structural lineaments map of the Bibi Hakimeh oil field (Surface fractures of the field in Aghajari Formation), is prepare and compared by the data obtained from FMI logs (In Asmari Formation). According to the circular diagram, in Bibi Hakimeh oil field the shear fractures (SO1) and surface axial parallel fractures (SX) have the highest percentages. According to the density map, the highest lineation densities have been seen in the middle belt of the fold from the east to the west, adjacent to the axis of the fold, that are related to the tensile joints in the axis. According to studies on the density map, extraction oil wells in the Bibi Hakimeh oilfield, mainly found in the areas with the highest fracture density. Comparison between the results of the fracture process of FMI 4 logs related to Bibi Hakimeh oilfield with the results of structural studies in this study shows that the trend of fractures in FMI data in the East part are completely compatible with the results of remote sensing studies,Therefore, studies are proposed to develop extraction wells and location for the exploration of new exploratory wells in the east and in sections with high fracture density obtained in this study.

The study area is located in central part of the Urumieh-Dokhtar magmatic arc and the southeast Ardestan area. Eocene volcanic rocks units with a combination of andesite and basaltic andesite constitute the most extensive rock units in the study area. These units are host to Ag-Cu and Au mineralization and alteration zones. Utilization of remote sensing methods especially composite pseudo color and Filters helped us to obtain valuable information on alteration zones, existing brittle structures and the role of Zafarghand fault in controlling alteration zone. The distribution pattern of the faults on processed satellite images, shows three generally orientations, changing in fault orientations, the density of faults in the north of the area and positive flower structure. Two different patterns of alteration zones are observed including propylitic alteration and zones of secondary iron oxides with large distributions around copper veins and argillic-sericitic alteration zones with limited and linear distributions around quartz veins. Comparison of the pattern of faults, mineralization and alteration zones indicate a decrease in the degree of mineralization and increase the extent of alterations along with reducing the density of faults from north to south of the region. The Zafarghand fault has an effective role in the creation and development of alteration in the study area. In this way, alteration is only seen toward the northern parts of this fault. The flower structure has created a tenstion and suitable location for mineralization and confluence of alteration zone in the south of the area.

The Saqqez area, situated in NW of Sanandaj-Sirjan metamorphic zone, was affected by several deformation stages which exhibit as forming of different faulting stages in Ductile to Brittle environments. The development of faults plays an import role in establishment of structural framework and deformation of this area. In this research, the outcropped rock units and main lineaments were extracted by using of remote sensing and GIS techniques. Then, the main and minor faults were defined and measured (their characteristics) in field surveys. The results of Kinematic and Geometrical analysis show that three stages of faulting were happened. The arrangement of faulting primacy is: the first stage faulting (with N130-140 trend) has deformations in ductile circumstance (in western part). Then, this stage was cut by second order of faulting (N60-70) in ductile to ductile-brittle condition. Finally, all of faulting were ruptured and offset by third order faults with N10-20 trend in brittle condition. These three stages of faulting formed the curve-shape of structures and rock unit patterns.

For assessment of validity of extracted lineaments by Remote Sensing techniques, these structures compared with other structures which either prepared & proven by field surveying or extracted from available geological maps. Therefore, the Northwestern part of Sanandaj-Sirjan zone, which has structures with different sizes, is selected as a case study. In this research, firstly, the lineaments were extracted by compilation of semi-automate Remote Sensing Techniques. In follow, the surveyed faults were prepared by field investigations and then, the other type of faults were extracted & digitized from available geological maps and finally entered as fracture vector layers in GIS environment. These layers were overlaid by using of GIS capability and then the visional comparison was carried out for investigation and assessment of validity of extracted lineaments by Remote Sensing techniques. The results of this research shown that only main and major extracted lineaments were valid and trustable, whereas, the small lineaments have no this validity, and these outputs will be must check & calibrate by carefully field investigations.

Abstract In this study, fracture systems of Akhlamad area was drawn using remote sensing methods and satellite data processing. Then their fractal pattern examined. Based on the regional fault related morphologies, different techniques were utilized to detect fault lines and fractures. To study the region, data of SPOT5, LandsatETM+ and ASTER were used. The resulting image of Landsat ETM+ merged with Panchromatic band for increasing the spatial resolution. Then the data were analyzed for detection of tectonic lineaments, lithological interruption and displacements due to faulting in ER-Mapper, ENVI and ArcGIS softwares. Also, Sunshading method was used on the DEM for detecting roughness caused by faults. Finally, the structural map of region was constructed using the fractures detected by the above mentioned techniques. Then, the fractal pattern of the structural fracture zone have done by Box-counting algorithm. For this purpose, the study area is divided into 94 separate areas and each area was analyzed separately. Based on the results, the fractal dimension is more in the direction NS, NNW-SSE and EW. Because the D value increases in these directions that has reached to 1.6. In other words, the directions have been developed further during the structural transformation. Given the certainty of these three direction, reactivation this area undertaken along these three.