TOPOGRAPHIC & HYDROGRAPHIC SURVEY
Scope Of Services:All kinds of topographic survey for construction project;
Structural Deformation Monitoring;
Marine construction positioning:
- We were and are doing many projects using RTK (Real Time Kinematic) technology for onshore and offshore area. This is a modern technology, combined dual frequency Topcon GPS receivers (Japan) with echo sounder Odom (USA) and professional software HypackMax (Coastal Oceanographics, Inc. - USA) (for offshore surveying).
- Motion sensor and Sound velocimeter are also used in the bathymetric survey to improve the accuracy.
- Besides, we have applied remote sensing (using satellite images) in the topographic survey to hasten the progress and save cost.
TOPOGRAPHIC SURVEY EQUIPMENT
Portcoast have many kinds of modern and high technique equipment (cetificated testing periodly and satisfy all survey requirements of various projects).
Have 8 dual frequency Topcon GPS receivers (Japan) GB-1000, GB-500, LegacyH & HiperGD, Hiper Ga/Gb, Hiper+ and 2 single frequency GPS receiver Promark2.
Includes a dual frequency echo sounder Odom Echotrac MKIII and a single frequency echo sounder Odom Hydrotrac.
Multibeam echo sounder:
Is the machine designed to increase bathymetric productivity and can survey small detail (≥ 2cm) rely on 480 transmit beams. Multibeam (and RTK system) is used to check the bathymetric result.
Montion sensor DMS-05:
Is important equipment to exactly correct echo sounder's data. In the sea/river survey, the result is affacted much on the stableness of survey means (boat, ship). When the survey boat is oscillated by wave, wind, currnet, the result has a big error.
Sound Velocimeter DigibarPro:
Is also an important equipment to correct echo sounder's data too. The velocity measurement is made from water surface to the bottom and reverse. The mean velocity value is used as sound velocity to process bathymetric data.
Side scan sonar:
Side scan sonar offers a high-resolution tool that provides a general depictive map on both sides of a survey vessel's path.
Sub-bottom EdgeTech 3200-XS (Mỹ):
The EdgeTech Topside Processor with it's DISCOVER software servers as the control ad data acquistion sub-system for dislay, storage and printing of sonar data from EdgeTech's family of Sub-Bottom Profilers and Side Scan Sonars.
A magnetic gradiometer measures magnetic gradient in one dimension by subtracking the difference between two independent magnetic sensors. Marine Magnetics offers each of these gradiometer configurations. In addition, all SeaSPY magnetometers are compatible, enabling existing SeaSPY customers to upgrade thir magnetometer to the gradiometer configuration of their choice, as they need to.
Has 4 sets of Topcon (Japan) with high precision.
Includes a Topcon AT-G3, a AT-g2 and two Leica NA2 with 2 sets of micrometer & Inva rods
Has a Garmin Map 2010, a Garmin 76CS, two Garmin 60CSx and a Garmin 12XL.
And orther instruments, tools as well as professional softwares such as: HypackMax, Topsurvey, Pinnacle, Toptools, Cidala, CivilCad,...
RTK (Real Time Kinematic) technique is used to eatablish the bathymetric map. This is a modern survey method that has a high accuracy, user 2 dual frequency GPS receivers Topcon with the dual frequency echo sounder Odom and Montion sensor.
Motion sensor can record motions of survey boat (such as shake, rotate and swing) thataffected by wave,wind,... With motion sensor, bathymetric result is much better.