GIS & Remote Sensing Services

We offer services to meet both GIS , LIDAR and Remote Sensing needs. We have strong knowledge in both areas, which is our strong asset. GIS/RS are main fields where we have built our expertise at international standard. It is noteworthy that the pioneering professionals of GIS & RS in Australia are the core resource personnel of our organization and its resource personnel has participated in most of the large GIS projects in Australia. Our expertise and experiences in the GIS & RS field include i) spatial (map) data conversion & building GIS databases, ii) image processing iii) development of spatial tools and iv) development of customized integrated GIS /AM software and or GIS analytical and mapping outputs. Our professional consists of GIS engineers, geographers, GIS programmers and technicians are capable of undertaking any complex GIS /CAD conversion related projects.

Our services:

Vector and Raster Mapping 

Necessity of the reliable and up-to-date data/information, for the purpose of efficient planning and management, is unavoidable. Vector maps are the representation of topographic mapping features consisting of point, line and area. It consists of preparing vector or topographic data from stereo aerial/RS images based on specification that usually used as an input for both public and private administrative tasks and construction projects right from the planning phase until the project terminates. Specification for mapping of topographic and thematic features depends on the clients requirements that vary with individual countries and projects.

Overallvision has an extensive experience in vector mapping where projects are undertaken at all scales for national mapping and large scale engineering design applications meeting all national and international specifications. Our highly trained staffs with a thorough knowledge of mapping specifications and with the availability of high standard software and hardware enables us to organize a large production in a quick and efficient manner .

Fig: Previous and impervious area from LiDAR

Feature Extraction- for building, Tree Canopy, Edge of Pavement & Road Centrelines Feature extraction via synergestic approach that uses LiDAR height and/or infra-red aerial photography/satellite imagery/Thermal Image.

We analyses edge-detected road edge shapes until approximately 98% “structural” certainty is gained. It then generates shapes approximating the logical physical limits of these road areas and the shapes are converted into a polygon shape file or user specified format for deliverables.

Fig: Building footprints are those roof portions which are exclusive of garages or sheds. Building footprints along with height attribute are decisive for flood inundation modelling. 

Counting individual plants with an RGB analysis. Converting this raster (left) to a contour shapefile and selecting the polygons with the signature of the plants provides a means of rapidly counting plants within a known area. 

Fig: Feature Extraction of road edges from aerial or satellite orthoimagery. Road edges have been utilized for pavement management, impervious areas, generating centerlines and for LiDAR breaklines.

Elevation & Height Modelling (DTM/DSM/DEM) LiDAR elevation and height modelling services.

A Digital Elevation Model (DEM) is a digital model or three dimensional (3D) representation of a terrains surface created from elevation data. The term DEM was introduced in the 1970s with the purpose of distinguishing the simplest form of terrain relief modelling from more complex types of digital surface representation. Originally the term DEM was exclusively used for raster representations (thus elevation values given at the intersection nodes of a regular grid). 

Digital Terrain Model (DTM) is a DEM of the shape of the ground surface. Digital Surface Model (DSM) is a DEM of the shape of the surface, including vegetation, infrastructures etc (See Figure 1). Both a DTM and DSM can be a DEM and, moreover, elevation” would not have to relate to terrain but could relate to some subsurface layer such as groundwater layers, soil layers or the ocean floor. 

Fig: DTM are a common way of representing elevation where every grid cell is given an elevation value. This allows for very rapid processing and supports a widearray of analysis.

Fig: DSMs are a common way of representing building and tree Spatial Data Integration

GIS data integration services. We can define Geospatial Data Integration as geometrically combining two or more different sources of geospatial content to facilitate visualization, analysis, fusion and simulation products.

Fig: interested in differentiating traditional approaches of geospatial data integration with those techniques that allow on-demand integration

Flood modelling: By making full use of high-resolution LiDAR elevation model, flood extents were derived at 10cm interval to visualise the inundation areas.

Fig: Flooding Hot spots processing from LiDAR

Hydrology modelling, flow analysis, drainage paths:

Overland flow paths are typically associated with gullies and depressions where surface water flows and collect. Overland flow paths pose considerable flood risk to the greater community. Flooding associated with overland flow paths has the potential to damage property and possessions, as well as posing a risk to life. This is especially true within the urban context given the highly developed urbanised areas and dense population.

Fig: Overland Flow Path from LIDAR

This determined the feasibility of hazard stratification based on the biometric characteristics of understorey and overstorey vegetation layers using LiDAR (Light Detection and Ranging) technology and analysis. Using a multi-criteria analysis with variables like hazard classes, riparian buffers, vegetation index, forest height classes, and relative presence of understorey/overstorey produced a single layer providing details to create a fuel hazard assessment of the project area. This project represented a significant progression in the practical application of LiDAR data to fuel load assessment at the landscape level. The methodology could be applied across neighbouring tenures, allowing for more comprehensive assessment of bushfire risk and providing information in determining the best treatment options to protect critical infrastructure assets.

Fig:Tree density map from LiDAR (tree cover, crown diameter, connectivity)

Fig: Tree Density and Ecological Application

GIS database design and QC tool:

FiG: stone wall data collection from LiDAR

Mobile mapping:

GIS and Asset Management Integration:

Our spatially-enabled asset management framework is a modern, user-friendly, open source information system created to help organizations inventory and manage virtually any kind of asset or resource. The framework is ready out-of-the-box and just needs to “plug-in”to your backend GIS, database, mapping technology or workflow. Unique functionality includes semantic ontology, graph database, fast elastic search, mobile data collection,built-in mechanisms to enforce data standards and full GIS / mapping functionality.

Our GIS asset management system combine powerful mapping and spatial analysis with a comprehensive system for organizing information on strategic assets for utilities, energy, government, transportation and many other industries. This includes information about the asset as well as location, proximity, adjacency and history. For example storm water mains repair can be mapped to street traffic and parking restriction signs to determine maintenance scheduling.

Who It’s Designed For

  • Water, treatment, storm & Gas & electric utilities
  • Streets & highway maintenance, rehabilitation or replacement
  • Building, equipment & facilities maintenance
  • Customer service & work order management

Fig: GIS data integration with Asset management system Automated & Remote Thermal Imaging

Designed with advanced maintenance-free electronics and industrial protective packaging, the Thermal Spection system offers a high degree of accuracy for demanding electric power utility’s while accurately measuring asset temperature without contact in even the most adverse environments. Thermal Section includes software that controls, captures and stores fully radiometric (thermal) images continuously into an SQL archive that supports alerts and retrospective analysis.

Source: 3D city model

There is an increasing need for the 3D models of urban areas for applications like town planning, microclimate analysis or transmitter placement in telecommunication. 3D city model plays a very prominent role now a day’s that is well suited for presenting even very complex problems in an easily accessible manner. This realistic visualization provides an easy and comprehensive overview of major construction projects, urban design, development and other high level urban investments.

3D-visualisation concept for city environment is a professional basis for planning, simulation, renovation and development. It gives a provision to the decision makers to make a realistic assessment of all consequences of a decision.

Decode is well equipped to produce 3D City model in a variable degree of detail (also called LoD, Level of Detail) which makes the tool usable for users with their professional focus and level of expertise.

Fig: 3D city model

Drone to map: Drone for Map tools create for professional imagery products from drone-captured still imagery for visualization and analysis in ArcGIS.

Fig:Land AnalysisDrones provide an affordable means of capturing images of natural andman-made land-based features and areas that may be difficult to access or fully cover because ofsize or terrain.

Infrastructure Inspection

Inspection of critical infrastructure using drones is a growing practice that improves the ability to inspect fixed assets, including those that span vast areas.


Drones are perfectly suited for monitoring scheduled events, environmental changes, and the impact of natural disasters.

Software Development: (outsource in India/Bangladesh)

We are proud of building a very innovative team of geo-information software developers, where currently a group of analyst, programmer, tester and technical documenting specialist are dedicated for undertaking any challenging information system and software development assignments.


  • Object oriented software design and implementation
  • Program coding, debugging/testing using developed solutions & algorithms
  • GIS and database application design, development and implementation
  • Documentation and preparing interactive help systems for the applications
  • Turnkey implementation of complete software development projects
  • Turnkey client/server systems design, integration and performance testing
  • Maintenance and technical support for the implemented software
  • Reengineering of legacy software applications
  • Provide programmers, systems integration and administrators support for both short and long term contract basis

Web-GIS Development (outsource in India/Bangladesh)

GIS data visualisation and presentation through internet/intranet services.