Hydrographic surveying in lakes and canal regions has not been an easy job in the past. Due to a lack of professional and portable surveying equipment and mobile platforms, the precision and accuracy are not always reliable enough. The process is also complicated and time-consuming. A real unmanned surface vehicle (USV) survey project took place in a lake in Thailand and aHi-Target hydrographic USVsuccessfully collected dependable results. It helped to calculate the volume data much more accurately and in less time.
地理
Pathumthani Province位于昭拍河的低冲积，流经泰国首都。它是该国最具人群的省份之一。该地区有很多运河和湖泊，将水分配给当地农业和渔业行业。
Project Task
Human beings are becoming more and more ambitious — they want more space for development purposes. Therefore, the relationship between humans and waterways, canals and lakes is under increasing pressure. For example, in the land reclamation project described in this article, after an environmental evaluation the local authority planned to fill in a small lake for commercial use. It was therefore necessary to carry out marine mapping to calculate the precise amount of earth needed for the project.
Challenges
紧迫的截止日期
建筑工地必须在一个月内准备好，对效率进行高要求。
安全风险
由于该地区曾经是一个大型沼泽区域并且充满泥泞的冲积，因此很难保证测量师的安全性，因为削减水，以完成海洋测绘。此外，软湖床和未知的场合提高了事故的风险。
Limited budget
This was the most vital factor to consider. The project manager had to prepare enough earth to fill in the lake without redundancy in order to save costs and reduce waste. Reliable information about the lake’s depth and width achieved by the USV survey, which is not easily distorted by incorrect signals, could help him estimate the amount of earth needed more accurately.
Hi-Target BS Series USV
Equipped with a slim body, modularized parts and a safety guidance system (autopilot), the Hi-Target USV is a convenient mobile platform of a professional survey system with stable performance for hydrographic surveying. The onboard echosounder is an exclusive design for theBS系列船, with high reliability preserved, as shown in the workflow below.
Workflow
- 环境调查。确保水面上没有明显的障碍物或隐藏物体，在水中可能对船造成风险。然后标记卫星映射和真实场景之间的不同点，然后相应地找到适当的部署点。
- 在推出水面之前，在岸上和船上设置船上的沟通。
- Deploy the boat on the water. Guide it along the border and then design the survey lane in the safe zone.
Make the boat sail and survey in autopilot mode, and switch to manual mode if necessary.
更正USV调查后处理过程中的深度数据。在该项目中将结果作为示例，图像中所示的绿线和小蓝色气泡是由回声处理器识别的原始深度数据，而红波是从湖底显示真实信号反馈的转向值。为了减少错误识别的深度信息并获得更接近现实的结果，测量师必须读取转向值以对准原始深度数据。否则，结果将不可靠。
重点福利
高效率
The small surveying equipment is agile enough to turn around swiftly and go for shorter distancing survey lanes to provide more real data. It allows surveyors to finish the bathymetry work of the hydrographic survey within less time.
Reliable Results
在专业后处理软件的帮助下，原始深度覆盖在回声图上，并且可以通过减小错误信号来对准真实深度。
安全保证
USV调查有助于测量师消除风险，因为他们可以在船上运营船上而不是冒险进入水上映射的水中。
Results
Hi-Target Hi-Max软件处理了深度数据并将轮廓填充为地形预览。
“This project is very important for my team. We want to get a result as accurate as we can while reducing the cost at the same time. TheHi-Target USV专业的软件系统真正给了我对现场的信心。我相信，高级USV调查创建的可靠的土方结果将有助于降低卡车装载和土壤的成本。“- 这个项目的经理
关于高目标
成立于1999年，Hi-Targetis the first professional high-precision surveying and mapping instrument brand to be successfully listed in China. Hi-Target provides a wide range of surveying equipment including GNSS receivers, CORS stations, total stations, 3D laser scanners, GIS data collectors, UAV/UAS, and hydrographic products to offer complete commercial solutions for various industries.
As the leading brand in the geospatial industry, Hi-Target invests heavily in research and development, on top of collaborating with more than 100 universities globally to bring the latest positioning technology and innovations for product development.
For over 20 years, Hi-Target has approximately 3,300 employees worldwide, with an established network of 64 subsidiaries, 28 branches and more than 200 partners in over 60 countries to service and support our customers.