3D Modelling of Kathmandu University

The 3D model of Kathmandu University is the first ever complete three dimensional model of an educational institution in Nepal that shows both landscape as well as building in 3D environment. The 3D model has been prepared adopting multisource data integration technique where different datasets from different sources were combined .The founders of NAXA are the students of Kathmandu University and they carried out this project as a part of their Engineering study in 2013.

Title      : 3D Modelling of Kathmandu University

Client Name      : University Project

Status        : Completed

 

The 3D model of Kathmandu University is the first ever complete three dimensional model of an educational institution in Nepal that shows both landscape as well as building in 3D environment. The 3D model has been prepared adopting  multisource data integration technique where different datasets from different sources were combined to prepare the final 3D model.

Kathmandu University is an non – government institution dedicated to maintain high standards of academic excellence in Nepal. The Geomatics Engineering Program at Kathmandu University is an unique program that focuses on building the manpower who can make use of both traditional and modern technologies for developing the geospatial domain in Nepal. As a part of the academic programs , the students are supposed to carry out Engineering projects every year. The founders of NAXA are the students of Kathmandu University and they carried out the GIS based 3D modelling project as a part of their Engineering study.A 3D surface model is a digital representation of features, either real or hypothetical, in three-dimensional space. A 3D surface is usually derived, or calculated, using specially designed algorithms that sample point, line, or polygon data and convert it into a digital 3D surface. ArcGIS can create and store three types of surface models: raster, TIN, and terrain data set.

The project made use of three major datasets : Land survey point datasets of the topography from Survey office , Banepa, AutoCAD design on individual buildings and Spatial datasets digitized from Google Earth. All these datasets were brought together into GIS platforms following certain data transformations.

The project incorporated following detailed steps to prepare the final 3D model.

 

  • Auto CAD plan of the University was converted to  a Geo-database in the Arc Map environment.
  • For accurate positioning of the features multipurpose cadastre data of the area was used and the Geo-database features were georeferenced as well.
  • Man made features like buildings,garage,bus park ,playground ground e.t.c were modeled using Google Sketch Up version 8,
  • Auto CAD plans of the buildings were used in most of the cases while for features without CAD plan photographs and 2D footprints  were used for preparing photorealisitic  models.
  • New type of feature class called as multipatch feature class( Multipatch has a unique geometry type in  Arc GIS as it can contain 3D models with vertical and overhanging faces) were prepared in GIS environment to support those 3D features.
  • 3D features built in Sketch Up were exported to COLLADA file formats. COLLADA which stands for Collaborative Design Activity—is an open-standard XML format for storing 3D models. Exporting multipatch features to COLLADA allows the sharing of complex analysis results with others and also provides a mechanism for updating textured 3D GIS data, such as buildings.
  • Features were now georeferenced over the 3D terrain which have been built in the Arc Scene environment.To make the terrain look more  realistic, editing was done using the  TIN editing toolbar which is available in arc GIS newer versions.
  • After completion of the 3D mapping activity now an animation was created in the Arc scene and this animation was finally uploaded on Youtube http://www.youtube.com/watch?v=yR_QqbpgLSM.

The use of three dimensional virtual models has expanded into many application fields. It has been popular to model city centers or other urban areas including buildings, roads, road structures like traffic lights and traffic signs, and vegetation.The 3D model generated this way can server as a Virtual Tour of the university thus allowing anyone interested to visit the university remotely, view the environment and existing infrastructures. The university can make use of the animation on its website and can also make upcoming batches of Engineering students engage in updating and refining the model as per the addition of new ground infrastructures.