Abstract
In order to achieve or complete the 1: 1.000 scale situation plan and the digital terrain model for the Timişoara - Sibiu highway section, and given the difficult access conditions in the project area, it was decided to use photogrammetric techniques for extraction of spatial information needed for mapping. In order to achieve the mapping requirements at a scale of 1: 1.000, the following activities were performed: Realization of the geodetic support network; Realization of the aerial photography project; Making pre-marking points in areas without clear details or other location possibilities; Simultaneous aerial photography of sub-blocks at different flight heights to ensure a 12 cm pixel and simultaneous laser scanning with LiDAR system; Identification of marking and pre-marking points on the subblock frames; Performing GPS measurements to determine the coordinates of landmarks and photogrammetric pre-marking; LIDAR data processing using permanent GPS stations to obtain coordinates in the ETRS89 system and transform them into the STEREO70 system and Black Sea reference plan 75; Calibration of LIDAR data; Filtering LIDAR data; Realization of aerotriangulation on subblocks or bands; Stereo restitution of planimetric and altimetric details for 1: 1.000 scale (3D mode); Transforming 3D plans into 2D plans; Editing and elaborating topographic plans.
Highlights
The acquisition of topo - geodetic data using modern geomatic technologies such as LiDAR [1] and global navigation satellite system (GNSS) is increasingly used due to the rapid evolution of positioning and measurement technologies [2]
In order to achieve and / or complete the 1: 1000 scale situation plan and the digital terrain model – DTM - for the Timisoara - Sibiu highway section, and given the difficult access conditions in the project area, it was decided to use photogrammetric techniques for extraction of spatial information needed for mapping
The photogrammetric method produces a greater coverage of the proposed area, which allows the designer to have an overview of the design area and choose optimal solutions
Summary
The acquisition of topo - geodetic data using modern geomatic technologies such as LiDAR [1] and GNSS is increasingly used due to the rapid evolution of positioning and measurement technologies [2]. The following equipment was used to perform the photogrammetric activities: Diamond DA42 MPP model LMS Q560 Based on these considerations, an aerial photograph was taken (fig.1) of the projected route with an average pixel resolution of 12-14 cm to ensure the accuracy required for the 1: 1000 plan (a graphic precision for writing the plans of 0.2 mm is ground for plans at a scale of 1: 1000 a resolution requirement of 20cm). An additional GPS station near Faget operated during the flight, which was used to verify the accuracy in case the permanent station in Faget was malfunctioning
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