Civil Engineering
Dalyot

Sagi Dalyot

, Dr.
Assistant Professor

Participatory mapping, Volunteered Geographic Information (VGI) and Geographic Information Systems (GIS).

Crowdsourcing and citizen science on usability aspects of GIS, Spatial Data Infrastructure (SDI) and environmental information.

Navigation and Location based Services (LBS).

Spatial data integration, interpretation and modeling.

Mapping-, Imagery- and Geo- metadata standards.

Theses

M.Sc. thesis, 2000, The Footprint Network as a Solution to the Representation Problem in Monitoring Deformations. Supervisor: Associate Prof. Haim Papo.

Ph.D dissertation, 2010, Hierarchal Modeling and Integration of Topographic Databases: Algorithm Development and Geo-Spatial Analysis Capabilities. Supervisor: Prof. Yerach Doytsher.

 

Books

  1. The Surveyor’s Contribution to Monitoring, Mitigating, and adapting to Climate Change, 2014. FIG Climate Change Task Force. Contributors:  Isaac Boateng, Sagi Dalyot, John Hannah, David Mitchell, Paul van der Molen, Martinus Vranken. FIG Publication No. 65, ISBN 978-87-92853-26-4 (76 pages).
  2. New Trends in Spatial Information: Geospatial Crowdsourcing and VGI – Possible Uses within the Surveying, Mapping and Geo-Science Communities. Research study by FIG Commission 3. Contributors: Yerach Doytsher, Hartmut Muller, Sagi Dalyot, Muki Haklay, Chryssy Potsiou, Babis Ioannidis (booklet to be published during 2016).

 

Fully Refereed Papers in Journals

  1. Jody Sultan, Gev Ben-Haim, Jan-Henrik Haunert and Sagi Dalyot. Extracting spatial patterns in bicycle routes from crowdsourced data. Transactions in GIS (accepted).
  2. Shay Sosko and Sagi Dalyot, 2017. Crowdsourcing User-Generated Mobile Sensor Weather Data for Densifying Static Geosensor Networks. International Journal of Geo-Information, 6(3): 61.
  3. David N. Siriba and Sagi Dalyot, 2017. Adoption of Volunteered Geographic Information into the Formal Land Administration System in Kenya. Land Use Policy, 63: 279-287.
  4. Ido Massad and Sagi Dalyot, 2015. Towards the Production of Digital Terrain Models from Volunteered GPS Trajectories. Survey Review, 47(344), 325-332.
  5. 11. Talia Dror, Yerach Doytsher, and Sagi Dalyot, 2015. A Quantitative Evaluation of Volunteered Geographic Information Paradigms: Social Location Based Services Case Study. Survey Review,  47(344): 349 – 362.
  6. Sagi Dalyot, 2015.  Landform Monitoring and Warning Framework Based on Time Series Modeling of Topographic Databases. Geosciences, Vol. 5: 177-202.
  7. 9. Gev Ben-Haim, Sagi Dalyot and Yerach Doytsher, 2014. Triangulation-Based Topology Approach for 2D Point Sets Registration. Survey Review, Vol. 46(338): 355-365.
  8. 8.David N. Siriba, Jasper N. Mwenda, and Sagi Dalyot, 2013. Time-Enabled Two-Dimensional Digital Cadastre: Case of the Kenyan Cadastre. South-Eastern European Journal of Earth Observation and Geomatics, Vol. 3(1): 109-121.
  9. Sagi Dalyot, Tobias Dahinden, Malte Jan Schulze, Joachim Boljen, and Monika Sester, 2013.Integrating Road Networks of Different Structural Geometric Primitives. Survey Review, Vol. 45(333): 428-440.
  10. Sagi Dalyot and Yerach Doytsher, 2013. Multi-Temporal Time-Dependent Terrain Visualization through Localized Spatial Correspondence Parameterization. ISPRS International Journal of Geo-Information, 2(2):456-479.
  11. Tobias Dahinden, Joachim Boljen, Nicole Ruhe, Sagi Dalyot, Malte Jan Schulze, and Monika Sester, 2013. Geodatenintegration – Semantischer und Geometrischer Abgleich von Vektordaten. Zeitschrift fur Geodasie, Geoinformation und Landmanagement (ZFV), Vol. 138(1): 85-94.
  12. Caroline Onyancha, Sagi Dalyot, David Siriba, and Monika Sester, 2012. Modelling of Spatial and Temporal Variations in Groundwater Rest Levels In Nairobi City Using Geographic Information System. Nile Water Science and Engineering Journal, Vol. 5(1): 26-33..
  13. David Siriba, Sagi Dalyot, 2012. Automatic Georeferencing of non-Geospatially References Provisional Cadastral Maps. Survey Review, Vol. 44(325): 142-152.
  14. David Siriba, Sagi Dalyot, and Monika Sester, 2012. A Novel Approach for Geometric Quality Enhancement of Legacy Graphical Cadastral Datasets. Survey Review, Vol. 44(325): 91-101(11).
  15. Sagi Dalyot, Eran Keinan, and Yerach Doytsher, 2008. Landslide Morphology Analysis Model Based on LIDAR and Spatial Topographic Datasets Comparison. Surveying and Land Information Science (SaLIS), Vol. 68(3): 155-170.

 

Refereed Book Chapters

  1. Monika Sester and Sagi Dalyot, 2015. Enriching Navigation Instructions to Support the Formation of Mental Maps. In: Advances in Spatial Data Handling and Analysis (Select Papers from the 6th IGU Spatial Data Handling Symposium, Toronto, Canada). Harvey, F.; Leung, Y. (Eds.). Series: Advances in Geographic Information Science, Springer, pp. 15-33, ISBN: 978-3-319-19949-8.
  2. Gev Ben-Haim, Sagi Dalyot, and Yerach Doytsher, 2015. Polygonal Quality-Dependent Approach for Digital Terrain Models Accuracy Computation. In: Advances in Spatial Data Handling and Analysis (Select Papers from the 6th IGU Spatial Data Handling Symposium, Toronto, Canada). Harvey, F.; Leung, Y. (Eds.). Series: Advances in Geographic Information Science, Springer, pp. 209-225, ISBN: 978-3-319-19949-8.
  3. Liguan Zhang, Sagi Dalyot, and, Monika Sester, 2013. Travel-Mode Classification for Optimizing Vehicular Travel Route Planning. In: Progress in Location-Based Services (9th Symposium on Location Based Services, Munich, Germany). Krisp, Jukka M. (Ed.). Series: Lecture Notes in Geoinformation and Cartography, Springer, pp. 277-296, ISBN: 978-3-642-34202-8.
  4. Sagi Dalyot, Ariel Gershkovich, and Yerach Doytsher, 2012. Hierarchical Approach for an Accuracy-Based Conflation of Multi-Topographic Databases. In: Advances in Geo-Spatial Information Science, International Society for Photogrammetry and Remote Sensing (ISPRS) Book Series, Taylor & Francis, CRC Press, pp. 155-174, ISBN: 978-0-415-62093-2.
  5. Yerach Doytsher, Sagi Dalyot, and Yaron Katzil, 2009. Digital Terrain Models: A Tool for Establishing Reliable and Qualitative Environmental Control Processes. In: GeoSpatial Visual Analytics, NATO Science for Peace and Security Series C: Environmental Security, Springer Science and Business Media, pp. 215-234, ISBN: 978-90-481-2898-3.
  6. Sagi Dalyot, Yerach Doytsher, 2009. A Hierarchical Approach Toward 3-D Geospatial Data Set Merging. In: Representing, Modelling and Visualizing the Natural Environment: Innovations in GIS 13, CRC Press, pp. 195-220, ISBN: 978-1-4200-5549-8.
  7. Sagi Dalyot, Yerach Doytsher, 2009. Hierarchical Modelling of Multi-Geospatial Databases as Basis for Geo-Oriented 3D Analysis Capabilities. In: Lecture Notes in Geoinformation and Cartography, Springer, pp. 301-318, ISBN: 978-3-540-87394-5.

 

Fully Refereed Publications

  1. Ruba Jaljolie, Peter Van Oosterom, and Sagi Dalyot, 2016. Systematic Analysis of Functionalities for the Israeli 3D Cadastre. 5th International Workshop on 3D Cadastres, pp. 447-471.
  2. Noa Binski, Lojuan Zhang and Sagi Dalyot, 2016. Wikipedia Entries as a Source of Car Navigation Landmarks. ISPRS XXIII Congress, Prague, Czech Republic. ISPRS Annals of Photogrammetry, Remote Sensing and Spatial Information Science, Volume III-2, 2016, pp.45-52.
  3. Shai Sosko and Sagi Dalyot, 2015. Towards the Use of Crowdsourced Volunteered Meteorological Data for Forest Fire Monitoring. Geoprocessing 2015, The 7th International Conference on Advance Geographic Information Systems, Applications, and Services, Lisbon, Portugal. Best Paper Award.
  4. Gev Ben-Haim, Sagi Dalyot, and Yerach Doytsher, 2014. Polygonal Quality-Dependent Approach for Digital Terrain Models Accuracy Computation. Joint ISPRS/IGU International Conference on Geospatial Theory, Processing, Modelling and Applications, Toronto, Canada.
  5. Monika Sester and Sagi Dalyot, 2014. Enriching Navigation Instructions to Support the Formation of Mental Maps. Joint ISPRS/IGU International Conference on Geospatial Theory, Processing, Modelling and Applications, Toronto, Canada.
  6. Gev Ben-Haim, Sagi Dalyot, and Yerach Doytsher, 2013. 2D Point Sets Registration: Aggregative Triangle-based Voting Algorithm. International Conference SDI and SIM 2013, Skopje, Macedonia.
  7. Gev Ben-Haim, Sagi Dalyot, and Yerach Doytsher, 2013. Geostatistical Approach for Computating Absolute Vertical Accuracy of Digital Terrain Models. 2013 Fourth International Conference on Computing for Geospatial Research and Application (COM.Geo), p. 32 – 39.
  8. Gev Ben-Haim, Sagi Dalyot, and Yerach Doytsher, 2012. Localized Accuracy Assessment of Topographic Databases: ASTER Case Study. 15th International Symposium on Spatial Data Handling, Bonn, Germany.
  9. Sagi Dalyot, Tobias Dahinden, Malte Jan Schulze, Joachim Boljen, andMonika Sester, 2012. Geometric adjustment Towards the Alignment of Vector Databases. ISPRS Annals of Photogrammetry, Remote Sensing and Spatial Information Sciences, vol. I-4, p. 13–18.
  10. Sagi Dalyot, Daniel Eggert, 2012. Octree-Based SIMD Strategy for ICP Registration and Alignment of 3D point clouds. ISPRS Annals of Photogrammetry, Remote Sensing and Spatial Information Sciences, vol. I-3, p. 105-110.
  11. David Siriba, Sagi Dalyot, 2011. Automatic Geo-referencing of Provisional Cadastral Maps: Towards a Survey-accurate Cadastral Database for a National Spatial Data Infrastructure. FIG Commission 3 Workshop, Paris, France. Best Paper Award.
  12. Sagi Dalyot, Yerach Doytsher, 2011. A Hierarchical Approach toward Time-Dependent Topographic Visualization, 14th AGILE Conference on Geographic Information Science, 18-21 April, Utrecht, The Netherlands.
  13. Caroline Onyancha, David Siriba, Sagi Dalyot, and Monika Sester, 2011. Spatial Modeling of Groundwater Conditions in Nairobi City using Geographic Information System, 15th International Conference for Women Engineers and Scientists (ICWES15), 19-22 July, Adelaide, Australia.
  14. Sagi Dalyot, Ariel Gershkovich, and Yerach Doytsher, 2010. A Hierarchical Quality-Dependent Approach toward Establishing a Seamless Nationwide Topographic Database, Joint International Conference on Theory, Data Handling and Modelling in GeoSpatial Information Science, May 26-28, Hong Kong, China.
  15. Sagi Dalyot, Yerach Doytsher, 2007. A New Concept for Dynamic Handling of Localized Georegistration Parameters between Two Geospatial Datasets, in proc. International Conference on Information Reuse and Integration, IRI 2007, IEEE, 13-15 Aug., pp. 429-435, ISBN: 1-4244-1500-4, Las Vegas, NV, USA.

 

Papers in Conference Proceedings (Abstract Refereed)

  1. David N. Siriba and Sagi Dalyot, 2015. Should Volunteered Geographic Information be Formalized or used alongside Formal Systems in Land Administration Systems? FIG Commission 3 Workshop, 2015, St. Julius, Malta.
  2. Ido Massad and Sagi Dalyot, 2015. Quality Analysis of Digital Terrain Models Produced from Crowdsourced Volunteered GPS Trajectories. 34th Geoinformation Conference, Tel-Aviv, Israel (in Hebrew).
  3. Talia Dror, Yerach Doytsher, and Sagi Dalyot, 2015. Crowdsourcing and Wisdom of the Crowd: Showcase of Social Location Based Services. 34th Geoinformation Conference, Tel-Aviv, Israel (in Hebrew).
  4. Yechezkel Sarid, Yerach Doytsher, and Sagi Dalyot, 2015. First Results of Hybrid Undulation Model for Israel. 34th Geoinformation Conference, Tel-Aviv, Israel (in Hebrew).
  5. Gev Ben-Haim, Sagi Dalyot, and Yerach Doytsher, 2014. Triangulation-based Voting Algorithm for Point Sets Registration. In proc. 33nd Geoinformation Conference – Modern Tools for Practice, March 27, Tel-Aviv, Israel (in Hebrew).
  6. Sagi Dalyot, 2013. Crowdsourced GPS routes – on the Location and Time Infrastructure Extraction. in proc. Geodesy, Mapping and Geographic Information, March 14, Tel-Aviv, Israel (in Hebrew).
  7. Liguan Zhang, Sagi Dalyot, Daniel Eggert, and, Monika Sester, 2011. Multi-Stage Approach To Travel-Mode Segmentation And Classification Of GPS Traces, ISPRS Archives – Volume XXXVIII-4/W25, Geospatial Data Infrastructure: from data acquisition and updating to smarter services, Eds.: J. Jiang and Q. Wang, 20–21 October, Guilin, China, pp. 87-93.
  8. Yerach Doytsher, Sagi Dalyot, 2009. Producing Seamless Multi-Source Quality-Dependent Digital Terrain Models, in proc. 7th FIG Regional Conference, October 19-22, Hanoi, Vietnam.
  9. Sagi Dalyot, Ariel Gershkovich, and Yerach Doytsher, 2009. Novel Real-Time Coordinate Transformations based on N-Dimensional Geo-Registration Parameters’ Matrices, in proc. 2009 FIG Annual Conference, May 3-8, Eilat, Israel.
  10. Sagi Dalyot, Eran Keinan, and Yerach Doytsher, 2008. Toward Continuous and Updated 3D Geospatial Terrain Modelling Based on DTM and LiDAR Data, in proc. ISPRS 2008, July 2-11, Beijing, China.
  11. Sagi Dalyot, Eran Keinan, and Yerach Doytsher, 2008. Continuous and Updated Geospatial Modelling of Surface Relief: DTM and LiDAR, in proc. Geodesy, Mapping and Geographic Information, February 14, Tel-Aviv, Israel.
  12. Sagi Dalyot, Yerach Doytsher, 2007. Geospatial Terrain Modeling: Hierarchical Approach toward Merging Topographic Models, in proc. Geodesy, Mapping and Geographic Information, March 8, Tel-Aviv, Israel (in Hebrew).
  13. Sagi Dalyot, Yerach Doytsher, 2006. A Hierarchical Approach toward 3D Geo-Spatial Terrain Merging, ISPRS Int. Archives, Commission IV Symposium, September 25-30, Goa, India, Volume XXXVI part 4. Second Best Paper Award.
  14. Sagi Dalyot, Yerach Doytsher, 2006. Pyramidal Approach toward Merging Topographic Data from Different DTM Datasets, in proc. ASPRS 2006 Annual Conference, Reno, Nevada, USA, May 1-5.
  15. Sagi Dalyot, Yerach Doytsher, 2006. A Pyramidal Approach for Merging Topographic Datasets, in proc. GISRUK 2006, April 5-7, The University ofNottingham, UK.

 

KEYWORDS

Environment, Cartography, Geometry, Internet/Web, LIDAR, Surveying, Geospatial, Databases, Geodesy, Geomorphology, Geography, GIS, Data mining, Integration, Matching, Adjustment, Change detection, 2D/3D Modelling, Visualization, Classification, Monitoring, Transformation, Registration, Simulation, Surface, Spatial infrastructures, Digital Elevation/Terrain/Surface Model, GPS/INS, Metadata, Georeferencing, Accuracy, Hierarchical, Temporal, Location Based Services (LBS), Crowdsourcing, Volunteered Geographic Information (VGI).

ACADEMIC DEGREES

2010, PhD Mapping and Geo-Information, Faculty of Civil and Environmental Engineering, Technion – Israel Institute of Technology, Israel.

2000, M.Sc. Geodetic Engineering (Cum Laude), Faculty of Civil and Environmental Engineering, Technion – Israel Institute of Technology, Israel.

1997, B.Sc. Geodetic Engineering (Cum Laude), Faculty of Civil and Environmental Engineering, Technion – Israel Institute of Technology, Israel.

 

ACADEMIC APPOINTMENTS

2016-  Asst. Prof.,  Transportation and Geo-Information Engineering, Faculty of Civil and Environmental Engineering, Technion – Israel Institute of Technology

2013–2016, Lecturer, Transportation and Geo-Information Engineering, Faculty of Civil and Environmental Engineering, Technion – Israel Institute of Technology.

2010-2013, Postdoctoral research fellow, Institute for Cartography and Geoinformatics (IKG), Leibniz University of Hannover, Germany.

2010-2012, Adjunct lecturer, Institute of Water Resources Management, Hydrology and Agricultural Hydraulic Engineering, Leibniz University of Hannover, Germany.

2007-2010, Adjunct lecturer, Urban and Regional Planning, Faculty of Architecture and Town Planning, Technion – Israel Institute of Technology.

2009, Adjunct lecturer, Mapping and Geo-Information Engineering program, Faculty of Civil and Environmental Engineering, Technion – Israel Institute of Technology.

 

PROFESSIONAL AND SCIENTIFIC EXPERIENCE AND ACTIVITIES

2015-2018, Chair of Working Group 3.4 on Crowdsourcing and VGI, FIG (International Federation of Surveyors) Commission 3 – Spatial Information Management.

2011-2014, Vice Chair of Administration, FIG (International Federation of Surveyors) Commission 3 – Spatial Information Management, scientific and organizing committees

2010-2012, Institute for Cartography and Geoinformatics (IKG), Leibniz University of Hannover, Germany.

2009-2010, Committee Consultant – GIS, The Standards Institution of Israel (SII)

2007-2010, Professional Consultant, Taldor

2000-2004, Project Manager and System Analyst, Taldor

2000, The Department of Geophysics and Planetary Sciences, Tel-Aviv University, Israel.

 

RESEARCH GRANTS

  • 2016-2017, Establishing a National Undulation Model for Israel2016-2018, Information System for Management of Multi-Dimensional Land Registration (Cadastre), PIs: Y. Doytsher, S. Dalyot, Funding: Survey of Israel, $50,000
  • PI: S. Dalyot, Funding: Survey of Israel, $40,000
  • 2016-2017, Crowdsourcing Assisted-GPS Sensor Ground Observations of Modern Smartphones for the Creation of Digital Terrain Models, PI: S. Dalyot, Funding: Mafat – Administration for the Development of Weapons and Technological Infrastructure, $50,000
  • 2015-2018, Topographic Models Integration and Geostatistical Analysis, PIs: Y. Doytsher, S. Dalyot, Funding: Rafael – Advanced Defense System Ltd., $200,000
  • 2015-2016, CIVITAS 2move2: Innovative Intermodal Transport Modes (8.04), PIs: D. Mahalel, S. Bechor, Funding: The European Union, $20,000 (in cooperation with Tel-Aviv Municipality and Transportation Research Institute, Technion, Israel)
  • 2015-2016, Julia and Joshua Ruch Exchange Grant, PIs: S. Dalyot, S. Azenkot, Funding: The Jacobs Technion-Cornell Institute, $7,000
  • 2013-2016, Applying Volunteered Geographic Information (VGI) for Analyzing Travel Behavior in Built Environments, PI: S. Dalyot, Funding: Technion Internal Research Fund, $6,000
  • 2015-2016, Evaluation of Automatic and Semi-Automatic Technology for Classification of General Land Cover and Vegetation, PIs: S. Dalyot, Funding: The Survey of Israel, $50,000 (in cooperation with Hetz Hazafon, Israel)
  • 2015-2016, CITIVAS 2move2: Innovative Intermodal Transport Modes (8.04), PIs: D. Mahalel, S. Bechor, Funding: The European Union, $15,000 (in cooperation with Tel-Aviv Municipality and Transportation Research Institute, Technion, Israel)
  • 2015-2018, Topographic Models Integration and Geostatistical Analysis, PIs: Y. Doytsher, S. Dalyot, Funding: Rafael – Advanced Defense System Ltd., $145,000
  • 2014-2016, Formation of Hybrid Geoid Undulation Model in Israel, PIs: Y. Doytsher, S. Dalyot, Funding: The Survey of Israel, $45,000
  • 2013-2015, Applying Volunteered Geographic Information (VGI) for Analyzing Travel Behavior in Built Environments,PI: S. Dalyot, Funding: New-York/Metropolin Research Fund, $1,500
  • 2014-2015, Optimal Fusion of Topographic Models from Various Sources, PIs: S. Dalyot, Y. Doytsher, Funding: The Center for Security Science and Technology, $32,000
  • 2014, 5DMuPLIS – 5D Multi-Purpose Land Information System, PIs: Y. Doytsher, S. Dalyot, Funding: Chief Scientist – Ministry of Industry, Trade and Labor, $180,000 (Greece-Israel collaboration, in cooperation with Sivan Design, Israel

Environmental Crowdsourcing Lab (ECsL)

http://ecsl.net.technion.ac.il/

RADUATE STUDENTS

Post-Doc

  • Dr. Lijuan Zhang, 2015-2017, Enriching Maps for Pedestrian and Bicycle Navigation Using Crowdsourced Volunteered Geographic Information, Supervisor: Sagi Dalyot.
  • Dr. Gev Ben-Haim, 2016, Algorithms Development for Managing Geospatial and Social Information in Environmental Crises, Supervisors: Sagi Dalyot, Shlomo Bekhor.

 

Ph.D Theses

Completed

  • Gev Ben-Haim, Local Accuracy Analysis of 3D Topographic Databases. Supervisors: Yerach Doytsher, Sagi Dalyot.

 

in Progress

  • Yechezkel Sarid, Hybrid Geoid in Israel. Supervisor: Sagi Dalyot.
  • Talia Dror, Crowdsourcing Geospatial Information: Developing Tools for Temporal-Based Accuracy Analyses, Supervisors: Yerach Doytsher, Sagi Dalyot.
  • Ido Massad, Fusion of Topographic Models, Supervisor: Sagi Dalyot
  • Matan Mor, Automatic Computation of Touristic Routes based on WWW Geotagged Photos. Supervisor: Sagi Dalyot
  • Ruba Jaljolie, Topology Data Structure and Functionalities in Support of Information System for Management of Multi-Dimensional Land Registration, Supervisors: Sagi Dalyot, Yerach Doytsher.

 

M.Sc. Theses

Completed

  • Dagmara Wziątek (Germany, 2013), Multi-Temporal Cliff Erosion Analysis Using Airborne Laser Scanning Survey: Rügen Island Case Study, Supervisor: Sagi Dalyot.
  • Ido Massad, 2015, Applying Kalman Filter in Modeling Digital Terrain Models from Crowdsourced-based GPS Observations, Supervisor: Sagi Dalyot.
  • Shai Sosko, 2016, Densifying Static Geosensor Weather Networks via Crowdsourcing of Mobile Sensor Observations, Supervisor: Sagi Dalyot.
  • Liat Mashiach, 2016, Statistical-Based Method for Parking Search on the Way to Destination, Supervisors: Joshua Greenfeld, Sagi Dalyot.
  • Shay Benaim, 2016, Hierarchical Approach for Extracting Road Network from Crowdsourced Data, Supervisor: Sagi Dalyot.
  • Jody Sultan, Extracting Spatial and Temporal Patterns of Bicycle Rides from Crowdsourced Data, Supervisor: Sagi Dalyot.
  • Noa Binski, Wikipedia as a Source of Landmarks for Enriching Car Navigation, Supervisor: Sagi Dalyot.

 

in Progress

  • Achituv Cohen, Building a Weighted Graph based on OpenStreetMap Data for Routing Algorithms for Blind Pedestrians, Supervisors: Sagi Dalyot, Shiri Azenkot.
  • Eliana Bshouty, Creation of LoD1 Buildings Using Volunteered Photographs and OpenStreetMap Vector Data, Supervisor: Sagi Dalyot
© All rights reserved to Civil Engineering
Web Development Web Development
Accessibility by WAH