TWM offers a highly skilled team of professionals who measure and map water bodies and accompanying shorelines to provide high resolution 3D images accurately and safely.


Our hydrographic surveying services include measuring depths for dredging, locating, and mapping debris fields or submerged obstructions, and preparing for underwater construction. Using high frequency single-beam sonar systems, TWM performs hydrographic surveys that capture full coverage of a project area and all necessary data.

Read More

Our Work & Projects

Explore some of TWM’s hydrographic surveying projects that demonstrate our design expertise, technical knowledge, and comprehensive range of capabilities.

Read More

Measuring & Mapping Data for Water-Dependent Projects

We provide a full range of services to governmental agencies, public institutions, and private companies to support waterfront development, dredge surveys, environmental remediation, and other water dependent engineering projects. Our surveying team is highly skilled in completing complex hydrographic surveys using the latest technology and processing techniques to produce bathymetric mapping datasets. This experience ranges from inland waters and rivers to ports and offshore environments.

  • Measures depth of bed and shorelines of water bodies

  • Determines navigation routes and nautical charts

  • Locates sewer fall by measuring direct currents

  • Establishes mean sea level and observation of tides

  • Identifies scouring, silting, and bed irregularities

  • Calculates area and volume of subaqueous floors

  • Computes discharge of rivers and streams

  • Aids in planning of structures such as bridges, dam harbors, reservoirs, port facilities, and pier construction


  • Flood control and capacity studies

  • Mobile vessel laser scanning

  • Geodetic control surveys

  • Bathymetric surveys and cross-sections

  • Geophysical surveying and geotechnical investigation

  • Environmental monitoring

  • Port management

  • Dredge studies and permitting


TWM separates itself from the competition by using state-of-the-art technology for data collection. Besides traditional surveying methods, we own, operate, and test reality capture tools daily, including UAVs, mobile/terrestrial LiDAR units, and the accompanying software.

We have the resources to provide multiple, fully-equipped survey crews matched to a project’s needs. Our expertise includes boundary, ALTA, right-of-way, construction, and engineering surveys.

This reality capture data tool uses an advanced high definition laser scanner to collect millions of data points in a fraction of the time of conventional methods.

An innovative mapping solution, this reality capture technology completes data collection five times faster by collecting survey-quality point data measurements, simply by walking or driving at highway speeds.

UAVs are equipped with sensors and cameras for scanning data. Our drone team, who are licensed remote pilots, gather this visual data of job sites to create accurate 3D models for planning and design.

Combining visual features with supporting databases, this digital mapping method is used to maintain utilities, monitor transportation conditions, and other activities.

TWM employs various detecting equipment to survey and map underground utilities and log utility depth and offset. Data is easily exportable to GIS, CAD, and other applications.

Also known as construction staking, TWM’s services use robotic total stations, 3D laser scanners, and digital levels to provide accurate construction plan data.


That’s our company mission and our promise to you. Our success is built upon a solid reputation for getting the job done right. One thing we are particularly proud of is approximately 95% of TWM’s work comes from repeat business. We believe our resolution of challenges sets us apart, and based on our level of repeat business, we think our clients will agree.