Gün geçtikçe kentsel alanlar kullanıcılar için riskli alanlar haline gelmektedir. Özellikle son d... more Gün geçtikçe kentsel alanlar kullanıcılar için riskli alanlar haline gelmektedir. Özellikle son dönemde Dünya’yı tehdit eden küresel iklim değişikliği sonucu kentlerde doğa kaynaklı veya insan etkisiyle oluşan afetler sıkça yaşanmaktadır. Son yıllarda kentlerde yaşanan afetlere çözüm bulmak ve kentleri daha yaşanabilir kılmak için birçok farklı kavram ve yaklaşım geliştirilmiştir. Bu kavram ve yaklaşımların amacı; artan afetlere karşı kentlerin baş etme kapasitesini artırmaktır. Bunlardan bazıları; afet direnci, kentsel direnç, iklim değişikliğine dirençli şehirler vb. Bu çalışmanın amacı; doğal-insan etkisiyle oluşan afet riski yüksek olan Van ili Erciş ilçesi için çoklu tehlike analizi yapılarak afetler bakımından riskli alanlarının belirlenmesi ve bu tehlikelere karşı kentsel dirençliliğinin sağlanması için ilgili koruma ve planlama araçları kapsamında önerilerin geliştirilmesidir. Çalışma alanında elde edilen afet verileri dikkate alınarak alanda yaşanmış ve yaşanma ihtimali yük...
Erisilebilirlik kullanici tarafindan bakildiginda, amaclanan bir nokta veya bir konuma ulasabilme... more Erisilebilirlik kullanici tarafindan bakildiginda, amaclanan bir nokta veya bir konuma ulasabilme kolayligini yansitan bir gosterge, bir urun, cihaz, hizmet veya ortam yonunden bakildiginda ise ilgilenilen olguyu kullanabilir insan miktarini gosteren bir derece olarak tanimlanabilir. Bu anlamda, gunumuz mekânsal planlama ve bolgesel kalkinma alanin onemli bir karakteristigini olusturmaktadir. En basit ifadeyle, kente dair tum mekansal planlama ve karar alma sureclerinde erisilebilirligin goz onunde bulundurulmamasi, ister engelli olsun ister engelsiz tum kullanicilarin kent yasamlarinda topyekun bir engelin olusmasi durumunu dogurmaktadir. Konuya acil durum yonetimi acisindan bakildiginda, acil saglik birimlerinin erisilebilirligi, gerek bireysel gerekse toplumsal acil durumlar icin hayati oneme sahiptir ve acil durum yonetim asamalari olan hazirlik, zarar azaltma, mudahale ve iyilestirme asamalarinin tumunde etkin acil mudahale yonetiminin olusturulabilmesi icin saglanmasi gerekli...
Earthquakes of 23 October 2011 and 9 November 2013 caused significant destruction on existing bui... more Earthquakes of 23 October 2011 and 9 November 2013 caused significant destruction on existing built-up areas of Van City, Turkey and had led to great loss of life and property. With the aim of identifying the effects of these two high-destructive earthquakes on spatial transformation process of the city, as well as to evaluate applied urban transformation strategies concerning to remove and mitigate the unfavourable effects of these earthquakes, maximum likelihood classification (MLC) is applied on related RapidEye satellite images to find out the urban macro-form changes, the change detection outputs by means of MLC results of the RapidEye satellite images dated before and after earthquakes which indicate that the overall accuracies are computed over 80%. The general results also reveal that the accuracies obtained are very promising to analyse spatial effect of the earthquakes on spatial transformation of the city. The identified findings of this analysis provide useful inputs to forthcoming researches aiming to evaluate the success of those kinds of urban transformation processes that may occur after similar natural disaster cases.
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A conceptual framework is proposed that defines the most appropriate 3D visualisations for differ... more A conceptual framework is proposed that defines the most appropriate 3D visualisations for different types of natural disasters in urban environments. Based on the disaster type, the needed level of detail for a 3D model is derived, which is then linked to the time needed to process the data and obtain this level of detail. The levels of detail are compliant with the 3D international standard CityGML. The framework is designed to serve risk managers and to help them make a better selection of 3D model representations to perform their tasks. After a brief introduction on the relations between types of disasters, data needed to manage the disasters and different users involved in the risk management process, the paper elaborates on the parameters according to which types of hazards are classified. The framework is demonstrated for an earthquake case in Eskisehir, Turkey. The paper concludes with a discussion of the advantages and disadvantages of the given framework, as well as an out...
Urban 3D visualization hardly considers an integrated manner for the data visualization in disast... more Urban 3D visualization hardly considers an integrated manner for the data visualization in disaster management. Generally, it should use interoperable approaches and data to reduce duplication of efforts and reduce costs. To achieve such interoperability, it is important to investigate the link between types of hazards and the required 3D model. Since a specific hazard may affect different urban features, it is believed that such a link can be described by a set of criteria. The criteria depend on the type of disaster and the urban 3D model. This paper presets a rule-based approach to derive the relation disaster/hazard type and the corresponding 3D model. The urban 3D features (and the spatial resolution) considered in our approach are compliant with level of detail (LoD) definitions as specified in CityGML. 1.
Visualization is the graphical presentation of information, with the goal of improving the viewer... more Visualization is the graphical presentation of information, with the goal of improving the viewer’s understanding of the information contents. As today’s world is getting richer in information, visualization of the information is important for effective communication and decision making. In this study, generation of a 3D city model in CAD environment and its use in a spatial decision support system for earthquake risk in an urban area is presented. As CAD products’ quality is more enhanced than the other tools the 3D city model is generated in CAD environment. In CAD environment, a 2D building foot print vector layer is used. After extrude operations, real building textures are obtained by taking pictures from the study area. Texture mapping tools are used to cover extruded buildings with acquired building texture images. The 3D city model is used to visualize each building’s earthquake risk level. The model also serves for querying and scenario analyses in a spatial decision suppor...
Urban 3D visualisation rarely considers integrated data visualisation in disaster management. In ... more Urban 3D visualisation rarely considers integrated data visualisation in disaster management. In general, such methods should incorporate interoperable approaches and data to avoid duplicating efforts and to reduce costs. To achieve such interoperability, it is important to investigate the link between the types of potential hazards and the needs of the appropriate 3D model. Then again, risk communication is one of the key components for managing tsunami risk. 3-D Visualization of the tsunami inundation has paramount potential for being an effective visual risk communication tool. This paper presents the application of the rule-based approach to derive the relation between the hazard type and the level of detail, for 3D dynamic inundation visualization model for tsunami in Fethiye Bay of Turkish Southern Coast. The 3D urban model features (and the spatial resolution) considered in this approach are compliant with the level of detail (LoD) definitions specified in CityGML.
Gün geçtikçe kentsel alanlar kullanıcılar için riskli alanlar haline gelmektedir. Özellikle son d... more Gün geçtikçe kentsel alanlar kullanıcılar için riskli alanlar haline gelmektedir. Özellikle son dönemde Dünya’yı tehdit eden küresel iklim değişikliği sonucu kentlerde doğa kaynaklı veya insan etkisiyle oluşan afetler sıkça yaşanmaktadır. Son yıllarda kentlerde yaşanan afetlere çözüm bulmak ve kentleri daha yaşanabilir kılmak için birçok farklı kavram ve yaklaşım geliştirilmiştir. Bu kavram ve yaklaşımların amacı; artan afetlere karşı kentlerin baş etme kapasitesini artırmaktır. Bunlardan bazıları; afet direnci, kentsel direnç, iklim değişikliğine dirençli şehirler vb. Bu çalışmanın amacı; doğal-insan etkisiyle oluşan afet riski yüksek olan Van ili Erciş ilçesi için çoklu tehlike analizi yapılarak afetler bakımından riskli alanlarının belirlenmesi ve bu tehlikelere karşı kentsel dirençliliğinin sağlanması için ilgili koruma ve planlama araçları kapsamında önerilerin geliştirilmesidir. Çalışma alanında elde edilen afet verileri dikkate alınarak alanda yaşanmış ve yaşanma ihtimali yük...
Erisilebilirlik kullanici tarafindan bakildiginda, amaclanan bir nokta veya bir konuma ulasabilme... more Erisilebilirlik kullanici tarafindan bakildiginda, amaclanan bir nokta veya bir konuma ulasabilme kolayligini yansitan bir gosterge, bir urun, cihaz, hizmet veya ortam yonunden bakildiginda ise ilgilenilen olguyu kullanabilir insan miktarini gosteren bir derece olarak tanimlanabilir. Bu anlamda, gunumuz mekânsal planlama ve bolgesel kalkinma alanin onemli bir karakteristigini olusturmaktadir. En basit ifadeyle, kente dair tum mekansal planlama ve karar alma sureclerinde erisilebilirligin goz onunde bulundurulmamasi, ister engelli olsun ister engelsiz tum kullanicilarin kent yasamlarinda topyekun bir engelin olusmasi durumunu dogurmaktadir. Konuya acil durum yonetimi acisindan bakildiginda, acil saglik birimlerinin erisilebilirligi, gerek bireysel gerekse toplumsal acil durumlar icin hayati oneme sahiptir ve acil durum yonetim asamalari olan hazirlik, zarar azaltma, mudahale ve iyilestirme asamalarinin tumunde etkin acil mudahale yonetiminin olusturulabilmesi icin saglanmasi gerekli...
Earthquakes of 23 October 2011 and 9 November 2013 caused significant destruction on existing bui... more Earthquakes of 23 October 2011 and 9 November 2013 caused significant destruction on existing built-up areas of Van City, Turkey and had led to great loss of life and property. With the aim of identifying the effects of these two high-destructive earthquakes on spatial transformation process of the city, as well as to evaluate applied urban transformation strategies concerning to remove and mitigate the unfavourable effects of these earthquakes, maximum likelihood classification (MLC) is applied on related RapidEye satellite images to find out the urban macro-form changes, the change detection outputs by means of MLC results of the RapidEye satellite images dated before and after earthquakes which indicate that the overall accuracies are computed over 80%. The general results also reveal that the accuracies obtained are very promising to analyse spatial effect of the earthquakes on spatial transformation of the city. The identified findings of this analysis provide useful inputs to forthcoming researches aiming to evaluate the success of those kinds of urban transformation processes that may occur after similar natural disaster cases.
E%>$.(CD(K-#:$;-#$=-+.(%$%";G(&+.#-,"%#(-.="/%$=",(,$=$(K-#:$;-#$=-+.(-.(,... more E%>$.(CD(K-#:$;-#$=-+.(%$%";G(&+.#-,"%#(-.="/%$=",(,$=$(K-#:$;-#$=-+.(-.(,-#$#="%(J$.$/"J".=L(
A conceptual framework is proposed that defines the most appropriate 3D visualisations for differ... more A conceptual framework is proposed that defines the most appropriate 3D visualisations for different types of natural disasters in urban environments. Based on the disaster type, the needed level of detail for a 3D model is derived, which is then linked to the time needed to process the data and obtain this level of detail. The levels of detail are compliant with the 3D international standard CityGML. The framework is designed to serve risk managers and to help them make a better selection of 3D model representations to perform their tasks. After a brief introduction on the relations between types of disasters, data needed to manage the disasters and different users involved in the risk management process, the paper elaborates on the parameters according to which types of hazards are classified. The framework is demonstrated for an earthquake case in Eskisehir, Turkey. The paper concludes with a discussion of the advantages and disadvantages of the given framework, as well as an out...
Urban 3D visualization hardly considers an integrated manner for the data visualization in disast... more Urban 3D visualization hardly considers an integrated manner for the data visualization in disaster management. Generally, it should use interoperable approaches and data to reduce duplication of efforts and reduce costs. To achieve such interoperability, it is important to investigate the link between types of hazards and the required 3D model. Since a specific hazard may affect different urban features, it is believed that such a link can be described by a set of criteria. The criteria depend on the type of disaster and the urban 3D model. This paper presets a rule-based approach to derive the relation disaster/hazard type and the corresponding 3D model. The urban 3D features (and the spatial resolution) considered in our approach are compliant with level of detail (LoD) definitions as specified in CityGML. 1.
Visualization is the graphical presentation of information, with the goal of improving the viewer... more Visualization is the graphical presentation of information, with the goal of improving the viewer’s understanding of the information contents. As today’s world is getting richer in information, visualization of the information is important for effective communication and decision making. In this study, generation of a 3D city model in CAD environment and its use in a spatial decision support system for earthquake risk in an urban area is presented. As CAD products’ quality is more enhanced than the other tools the 3D city model is generated in CAD environment. In CAD environment, a 2D building foot print vector layer is used. After extrude operations, real building textures are obtained by taking pictures from the study area. Texture mapping tools are used to cover extruded buildings with acquired building texture images. The 3D city model is used to visualize each building’s earthquake risk level. The model also serves for querying and scenario analyses in a spatial decision suppor...
Urban 3D visualisation rarely considers integrated data visualisation in disaster management. In ... more Urban 3D visualisation rarely considers integrated data visualisation in disaster management. In general, such methods should incorporate interoperable approaches and data to avoid duplicating efforts and to reduce costs. To achieve such interoperability, it is important to investigate the link between the types of potential hazards and the needs of the appropriate 3D model. Then again, risk communication is one of the key components for managing tsunami risk. 3-D Visualization of the tsunami inundation has paramount potential for being an effective visual risk communication tool. This paper presents the application of the rule-based approach to derive the relation between the hazard type and the level of detail, for 3D dynamic inundation visualization model for tsunami in Fethiye Bay of Turkish Southern Coast. The 3D urban model features (and the spatial resolution) considered in this approach are compliant with the level of detail (LoD) definitions specified in CityGML.
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