Projects Section
Aerial Triangulation
Project Name: Restigouche
Project Inputs: 337 UltracamVexcelD photos with a GSD of 20cm, covering an area of 214 Km², Camera calibration report, Control Points, GPS / IMU data, Flight plan Index diagram
Project Scope:
The project required to Aero Triangulate the given project area with the help of GPS / IMU & Ground Control Points provided, within specified accuracy parameters. The AT deliverables were as following:
Digital Terrain Model (DTM)
Project Name: City of Cornwall
Project Inputs:
Aerial Images, External Orientation Parameters (EO File), Camera Calibration Report, Tile Index with Area of Interest, Technical Specification Document, Tile naming scheme.
Total Area: 62 Km²
Total Area: 62 Km²
Project Duration: 3 weeks
The project consisted of capturing the Digital Terrain Model (DTM) including mass points, soft & hard breaklines in the area of interest located in the City of Cornwall and further tiled using the provided tile index.
Orthophoto
Project Name: City of Cornwall
Aerial Imagery, RGB (40cm resolution for 406 townships & 10cm resolution for 14 towns & residential sub-divisions)
# of Photos with 10cm GSD: 259
# of photos with 40cm GSD: 4184
External Orientation Parameters (EO File), Camera Calibration Report, Tile Index with Area of Interest, Technical Specification Document, tile naming scheme, Project Shape files & client provided DTM
Project Duration: 5 weeks
The project consisted of producing 10cm & 40cm GSD Orthophotos and mosaics of the coverage area located in the Province of Alberta, Canada. The client provided inputs including DTM were used in the orthorectification of the images and tiled using the provided tile index.
3D City Modelling
Client : Various councils, infrastructure developers etc. across Australia & Europe.
Input : Raw aerial images, camera report, ground control points & flight data.
Deliverable : 3D City Model
Aerial Triangulation (AT) is performed to geographically reference the images and to supplement the ground control points. This AT result is then used for photogrammetry stereo model setup. Detailed building roof lines and DTM is captured in stereo. The DTM data is used for Orthophoto generation& rectification which is mosaicked and colour balanced.
The 3D building roof polylines and the terrain data is imported into 3D Max studio software. The building polylines are draped to ground level and the roof textures are mapped from the aerial photos. The side textures are mapped out from a terrestrial photograph for higher level of details.
These 3D terrain & textured buildings are then imported to our clients' 3D urban simulation software for a state of the art solution that enables users to build and simulate any actual or conceptual world environment in highly accurate photo realistic interactive 3D.
The simulator can simulate any location given a source of terrain photography and a source of height data. CAD models can be imported into the simulated environment and realistic elements can be replicated such as vegetation, infrastructure, utilities, vehicles etc. lit with accurate solar lighting and casting shadows.
2D & 3D Topographical mapping
Project Name : NL Topo Mapping - Avondale
Project Inputs Raw aerial images, camera report, ground control points & flight data.
Project Scope:
The project consisted of digital data collection and creation of topographic map using the stereo plotting equipment. According to the specifications provided, the mapping must show all topographic details visible on the photography (with the exception of street hardware) that can be shown clearly at a scale of 1:2500 photographs. It had been required to take particular care to show all fences, cut lines, and other evidence of land occupation. Features such as quarries, gravel pits, open pit mines, log piles, coal, sand and slag piles etc. were shown by areas (polygons).
HORIZONTAL ACCURACY:
95% of all well-defined features, as viewed in the stereo model, must be recorded in the digital data set within 30cm of the same position read on the best stereo model.
VERTICAL ACCURACY:
95% of all spot heights shall be accurate to 50 cm of the same position read on the best stereo model.
95% of all contours shall be accurate to one metre in height of their true elevation.
The accuracies specified above pertained to the ground not sufficiently obscured by vegetation cover.
LiDAR
Project Name : SPDA LiDAR
Project Inputs: LiDAR .LAS Tiles & .PTC file, Trajectory & Shape files, Tile Index with Area of Interest, Tile naming scheme & Technical Specification Document.
Project Duration: 12 weeks.
The project aimed at LiDAR bare earth classification, contour & grid generation of the coverage area and further tiled using the provided tile index. The final deliverables comprised of 1.0m Bare earth GRD, 1.0m Full feature GRDs with TAB format, Minor contours at 0.25m interval &Major contours at 1.0m interval.
Golf Course Mapping
Project Name : Over 3000 Golf Courses across USA & other locations.
Inputs: Raw aerial images, camera report, ground control points & flight data.
Deliverable: Mosaicked Orthophoto &the attributed vector data
Aerial Triangulation (AT) is performed to geographically reference the images and to supplement the ground control points. This AT input is then used to generate and edit an automatic terrain model according to project specifications. The obtained terrain data terrain data is used to generate the Orthophotos & mosaic into a single, seamless file. This mosaicked Orthophoto is then used for data digitizing according to the project specifications. Attributes are added to indicate, size / acreage of golf course, size of greens, tee distances, location of hazards, address of the golf course etc. This comprehensive GIS solution helps in the management of the golf course.