This study was conducted to devise an integrated methodology for retrieval of surface soilmoisture(SSM)using Landsat 8 TIRS data.For this purpose,Landsat 8 images of 15 May 2021(pre-monsoon)and 20 November 2021(post-m...This study was conducted to devise an integrated methodology for retrieval of surface soilmoisture(SSM)using Landsat 8 TIRS data.For this purpose,Landsat 8 images of 15 May 2021(pre-monsoon)and 20 November 2021(post-monsoon)were processed for retrieval of soil moisture index(SMI)based on land surface temperature(LST).Moreover,field-based SM in the laboratory was also determined and correlated with satellite-based SMI.A moderate correlation between field-based SM and satellite-based SMI with R2=0.60 was obtained.Based on this relationship,SSM maps of Tehsil Faisalabad Saddar for the pre-and post-monsoon seasons of 2021 were developed.Significant variations in the spatial distribution of SSM of Tehsil Faisalabad Saddar(total area of 1492.45 km^(2))for pre-and postmonsoon seasons were observed.In the pre-monsoon season,68.1% of the area of Faisalabad Saddar showed SSM contents ranging from 10.37%to 15.40%.Only 8.7%of the total area of Faisalabad Saddar exhibited SSM in the range of 15.41%-22.82%in the pre-monsoon season.It was astonishing to notice that no area in Faisalabad Saddar was detected with SSMabove 22.82% in the pre-monsoon season.However,in the post-monsoon season,only 0.11%of the total study area exhibited SSM in the range of 0.0%to 26.97%.The maximum area(52.29%of the total area)in post-monsoon season exhibited SSMranging from 36.18%to 40.02%,followed by 32.02%-36.17%(34.3% of the total area).The study concluded that satellite-based retrieval of surface soil moisture realistically monitored the variations in soil moisture due to the onset of the monsoon season.The novel methodology developed in this study could be helpful for policy making regarding groundwater recharge and its sustainable use in an area,as well as for estimating surface soilmoisture to provide irrigation scheduling and crop management guidelines.展开更多
Northeastern Morocco is made up of several units belonging to the Alpine belt and its foreland. Miocene to plio-quaternary volcanic rocks with variable mineralogy and geochemistry dominate the geology of this region. ...Northeastern Morocco is made up of several units belonging to the Alpine belt and its foreland. Miocene to plio-quaternary volcanic rocks with variable mineralogy and geochemistry dominate the geology of this region. The presence of active faults in different directions explains the high tectonic instability and the high frequency of earthquakes. This study contributes to the effort of understanding the geothermal potential of the Northeast of Morocco. Heat source and permeability are both key factors in the geothermal process. Indeed, lineaments analysis constrains the structures and their directions and indicates severely faulted zones, which are the most promising areas for geothermal exploration. For this purpose, we used Landsat data combined with geological and structural maps available in this region. Different image processing techniques were applied including band ratio (6/2) and directional filters. To validate the results, we conducted a comparative study between linear structures, available geological data, and previous studies. Results of the automatic extraction method of lineaments from Landsat 8 OLI/TIRS indicate three main lineament systems: 1) a NE-SW system ranging from N40 to N70;2) an N-S system ranging from N10 to N45;3) an EW to WNW-ESE systems ranging from N80 to N120. Most of lineaments extracted are localized in Kebdana, Amejjaou, Nador and Melilla regions. Compared to previous studies, the NE-SW system is consistent with an extensive period (Tortonian to Pliocene);the NW-SE system is consistent with the last compressive episode (Pliocene);the N-S system is consistent with the first compressive period (Late/End Tortonian).展开更多
This paper offers a Derivation of Urban Heat Island (UHI) for Landsat-8 TIR on the application of urban climatology in Riyadh city. GIS and remote sensing are provided to determine the possibility of consolidation acr...This paper offers a Derivation of Urban Heat Island (UHI) for Landsat-8 TIR on the application of urban climatology in Riyadh city. GIS and remote sensing are provided to determine the possibility of consolidation across the heat island in Riyadh. The primary aim of this work is deviation in temperature and makes up an urban heat island (UHI). To create the database required for the study, using satellite images in monitoring thermal emission peaks for the surface of the earth (UHI), we used band ten and band eleven that represented the thermal band, which depended to extract the temperature of the surface (TOAr). The first step was Conversion DN to Radiance;the second was Radiance into degrees Kelvin and the third was Convert degrees Kelvin into degrees Celsius. In the final Produced Urban Heat Island (UHI), maps help to find out the thermal peaks clearly that affect urban climatology by elevating the temperature of the (UHI) and (UHI) peaks of the surrounding regions and the extent of its impact on the occupants of nearby countries. The paper concluded by the study area contains 10 Urban Heat Islands (UHI). Its presence has been associated with the types of land-utilization and requires intervention by the municipality of the city to hold the (UHI) and dilute the impact and types of land usage. Most impact is negative including increased energy consumption, elevated emissions of air pollutants and greenhouse gases compromised to human health and impaired water quality.展开更多
文摘This study was conducted to devise an integrated methodology for retrieval of surface soilmoisture(SSM)using Landsat 8 TIRS data.For this purpose,Landsat 8 images of 15 May 2021(pre-monsoon)and 20 November 2021(post-monsoon)were processed for retrieval of soil moisture index(SMI)based on land surface temperature(LST).Moreover,field-based SM in the laboratory was also determined and correlated with satellite-based SMI.A moderate correlation between field-based SM and satellite-based SMI with R2=0.60 was obtained.Based on this relationship,SSM maps of Tehsil Faisalabad Saddar for the pre-and post-monsoon seasons of 2021 were developed.Significant variations in the spatial distribution of SSM of Tehsil Faisalabad Saddar(total area of 1492.45 km^(2))for pre-and postmonsoon seasons were observed.In the pre-monsoon season,68.1% of the area of Faisalabad Saddar showed SSM contents ranging from 10.37%to 15.40%.Only 8.7%of the total area of Faisalabad Saddar exhibited SSM in the range of 15.41%-22.82%in the pre-monsoon season.It was astonishing to notice that no area in Faisalabad Saddar was detected with SSMabove 22.82% in the pre-monsoon season.However,in the post-monsoon season,only 0.11%of the total study area exhibited SSM in the range of 0.0%to 26.97%.The maximum area(52.29%of the total area)in post-monsoon season exhibited SSMranging from 36.18%to 40.02%,followed by 32.02%-36.17%(34.3% of the total area).The study concluded that satellite-based retrieval of surface soil moisture realistically monitored the variations in soil moisture due to the onset of the monsoon season.The novel methodology developed in this study could be helpful for policy making regarding groundwater recharge and its sustainable use in an area,as well as for estimating surface soilmoisture to provide irrigation scheduling and crop management guidelines.
文摘Northeastern Morocco is made up of several units belonging to the Alpine belt and its foreland. Miocene to plio-quaternary volcanic rocks with variable mineralogy and geochemistry dominate the geology of this region. The presence of active faults in different directions explains the high tectonic instability and the high frequency of earthquakes. This study contributes to the effort of understanding the geothermal potential of the Northeast of Morocco. Heat source and permeability are both key factors in the geothermal process. Indeed, lineaments analysis constrains the structures and their directions and indicates severely faulted zones, which are the most promising areas for geothermal exploration. For this purpose, we used Landsat data combined with geological and structural maps available in this region. Different image processing techniques were applied including band ratio (6/2) and directional filters. To validate the results, we conducted a comparative study between linear structures, available geological data, and previous studies. Results of the automatic extraction method of lineaments from Landsat 8 OLI/TIRS indicate three main lineament systems: 1) a NE-SW system ranging from N40 to N70;2) an N-S system ranging from N10 to N45;3) an EW to WNW-ESE systems ranging from N80 to N120. Most of lineaments extracted are localized in Kebdana, Amejjaou, Nador and Melilla regions. Compared to previous studies, the NE-SW system is consistent with an extensive period (Tortonian to Pliocene);the NW-SE system is consistent with the last compressive episode (Pliocene);the N-S system is consistent with the first compressive period (Late/End Tortonian).
文摘This paper offers a Derivation of Urban Heat Island (UHI) for Landsat-8 TIR on the application of urban climatology in Riyadh city. GIS and remote sensing are provided to determine the possibility of consolidation across the heat island in Riyadh. The primary aim of this work is deviation in temperature and makes up an urban heat island (UHI). To create the database required for the study, using satellite images in monitoring thermal emission peaks for the surface of the earth (UHI), we used band ten and band eleven that represented the thermal band, which depended to extract the temperature of the surface (TOAr). The first step was Conversion DN to Radiance;the second was Radiance into degrees Kelvin and the third was Convert degrees Kelvin into degrees Celsius. In the final Produced Urban Heat Island (UHI), maps help to find out the thermal peaks clearly that affect urban climatology by elevating the temperature of the (UHI) and (UHI) peaks of the surrounding regions and the extent of its impact on the occupants of nearby countries. The paper concluded by the study area contains 10 Urban Heat Islands (UHI). Its presence has been associated with the types of land-utilization and requires intervention by the municipality of the city to hold the (UHI) and dilute the impact and types of land usage. Most impact is negative including increased energy consumption, elevated emissions of air pollutants and greenhouse gases compromised to human health and impaired water quality.
