Remote sensing technologies are revolutionizing the land surveying industry by allowing for safe and efficient data collection even in the most difficult environments. Thew Associates continues to invest in the latest technologies to provide greater value to our clients. Our in-house data processing team has the capability to deliver data collected from terrestrial laser scanning or sensors mounted on sUAS platforms in multiple formats.

Terrestrial Laser Scanning

With our RIEGL VZ-400 3D Terrestrial Laser Scanner, Thew Associates can provide static 3D laser scanning services for our clients. We can complete high-definition survey scans of most sites providing comprehensive three-dimensional spatial and elevation data with decreased data collection time and increased cost efficiencies.
  • Interior and exterior structure scanning for renovation and restoration
  • As-built surveying and mapping
  • Topographic surveying and mapping
  • Structural deformation monitoring
  • 3D point cloud data with RGB assigned color values
  • True 3D mapping with digital terrain modeling
  • Traditional 2D mapping with elevation data
  • Point cloud viewer application capable of extracting measurements


The RIEGL miniVUX-1 LiDAR sensor that Thew Associates’ utilizes is equipped with a RGB camera which allows us to provide a high density colorized point cloud to clients. The general output of a LiDAR sensor is a .LAS file. This file contains vector data for every point within the cloud. Therefore, many different “Layers” of data can be extracted from the .LAS file. These layers can be translated to different types of GIS formats such as 3D Face, 3D Mesh, vectors, TIN’s, DSM’s, DTM’s, break lines, planimetric lines, etc.
  • Raw Point Cloud – Attributes include: XYZ, Intensity, Return #
  • Classified Point Cloud – Attributes include everything from Raw Point Cloud plus unique classification of buildings, vegetation, powerlines, utility poles, ect.
  • Extracted features – Buildings, trees, etc.
  • Rasters – Digital Elevation Models, Digital Surface Models, and Intensity rasters.
  • Contours (GIS or CAD formats)
  • AutoCAD breaklines and feature

UAV Photogrammetry

With the LiDAR sensor integrated with the RGB camera, Thew Associates can deliver high-quality imagery data of a client’s project site. Thew Associates’ UAV pilots can also capture video in areas that are not safely or easily accessible otherwise.
  • Orthomosaic
  • RGB point cloud
  • Digital Surface Model (DSM)
  • Digital Terrain Model (DTM)
  • Planimetrics

Airborne LiDAR and Photogrammetry

Thew Associates is committed to managing all aspects of a client’s geospatial requirements to include LiDAR and photogrammetry surveying and mapping of larger project sites. We have longstanding relationships with aerial mapping firms whom we partner with to collect the LiDAR and aerial imagery and then manage the data processing in-house.

Michael P. Merithew, PLS

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