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Remote Sensing

Introduction:
RemoteSensingRemote sensing is a process to obtain information on certain phenomenal characteristics and record them in a recording device that is not in direct contact with the phenomena in question. In essence it is a data-collection operation through the range of ultraviolet waves to the radio band. The technology of remote sensing has considerable application in fields such as exploration of natural resources. The importance of remote sensing of all types, aerial photos, satellite pictures and radar and others, is manifested in the fact that it backs the constant monitoring of the earth and its resources with the provision of a wealth of information. The major uses of remote sensing can be summed up in the following:
• Geology: remote sensors detect mineral and petroleum raw materials and processed photos are used in mining based on the fact that each type of rocks or minerals has its own absorption spectrum. There are attempts to use satellite photos in the field of oil though such attempts remain of a research nature knowing that satellite photos address the surface phenomena while the oil industry is focused on the subsurface ones. Another geological use is related to the observation of the earth movements, earthquakes and volcanoes.
• Water: the movement of rivers, lands and lakes drought, dealing with floods forecasted through images taken at intervals. It is rather possible to look for groundwater under the deserts through the radar pictures.
• Agriculture: the inventory of agricultural crops, detection of plants pests, identification of the state of the earth and study of the specific distribution of lands and soil.
• Disasters and hazards: prevention of floods and earthquakes, following up the survivors along with the nuclear bombs and their impact on the surrounding areas and the forest fires.
• Engineering works: study of the construction projects and urban planning of cities, villages and mega projects.
• Astronomy: space surveillance.
RemoteSensing-1In recognition of the importance of remote sensing, the Board's leadership established the Remote Sensing Department within the hierarchy of the General Authority of Geological Survey back in 1997 to undertake the following missions:
• Participating in the implementation of the feasibility study for the creation of the National Center for Remote Sensing.
• A preliminary study on the Gabbro mass in Ataq area in Shabwa.
• Development of Yemen's digital mosaic.
• Study of the mineralization of Al-Hariqa area and the surrounding areas.
• Completing the three-part spectral reference guide of sedimentary rocks.
• Study of the Badbada area mineralization in Mareb.
• Study of the iron deposits in Al-Thanya and Banat Al-Mathoul area in Mareb.
• Finalizing the first phase of Yemen's metallogenic map.
• Finalizing thematic maps of Al-Mukalla, Al-Shihr, Ghail Bawazeer and Beer Ali.
• Furnishing the Ministry of Industry and Commerce with satellite videos of Aden, Hadramawt and Al-Hodeida.
• Furnishing the UN representative with some videos on Yemen's volcanic areas,
• Providing Sana'a University with some satellite footage.
• The Spectral Guide of Reference of Yemen's exposed rocks containing an atlas of the spectral characteristics of sedimentary rocks, an atlas of the spectral characteristics of volcanic rocks and igneous intrusions in addition to the igneous rocks and the metamorphic rocks spectral characteristics.

This guide is a documented and systematic reference as it spectrally identifies the satellite footage of any component of the lithosphere in a precise and smooth manner. The benefits of the spectral guide are various, such  as supporting of the geological studies in mineral prospecting, environment and hydrogeology…etc.

Several exploratory studies have been made using the remote sensing technology to select the sites of new human settlements in Yemen with modern city components provided. A study has been completed for Ras Al-Arah in Lahj with the creation of a digital geometric information base by interpreting the spatial footage and using the available geological and topographic data and then producing specific thematic maps and entering these in an appropriate GIS.
RemoteSensing-2
مرئية فضائية تبين منطقة رأس العاره – محافظة لحج
Remote Sensing