Protecting the Netherlands against floods with mobile mapping technology

Author:Arno Kijzerwaard

荷兰59％的领土容易受到洪水的影响，而26％的领土低于海平面。对于这个西欧国家而言，防止和保护海水水平上升至关重要 - 在1953年的北海洪水中，荷兰证明了加强肋骨防御能力的重要性。由于其低且平坦的地理位置，该国包含大量堤防 - 准确地说是17,691公里。

该国的堤防由沃特板管理。在荷兰中部，有MAAS，WAAL和NEDERRIJN河流美丽而脆弱的地区 - 由于气候变化，海平面正在上升，导致河流洪水泛滥。为了确保公民安全，该地区的堤防每两年检查一次，并每六年对其进行一次调查，以确保他们保持高高和足够的稳固。

Kempkes Landmeten, a company specialised in translating data within the broad spectrum of geodesy,surveyed 19 kilometres of dike along the Waal river, in the area of Waterboard Rivierenland. To give an idea of scale, this is 10% of the width of the Netherlands. In the past, dikes were surveyed with traditional survey methods involving a great deal of levelling. Over time, airborne methods, such as laser scanning from a helicopter were applied. Even when surveying from the air is far more efficient than traditional surveying, several rules, accuracies and safety measures must be applied.

Choosing next-generation mobile mapping

Kempkes Landmeten discussed with Waterboard Rivierenland a new method to survey the safety of the dike. They proposed to use next-generation mobile mapping technology, theLeica Pegasus:Two Mobile Sensor Platform, to deliver the task with the quality requested.

整个区域的传统调查将花费数月才能完成 -19-kilometre trajectory was done in two dayswith the mobile mapping solution mounted on a normal car, scanning from the road. Using the Pegasus:Two on different vehicles to survey off-road, the whole project was then scanned in only a few days. This included a double run, processing the mobile mapping data and generating the results. The traditional surveyor now only had to capture point clouds and “holes” in the data that could not be captured via mobile mapping.

对于这个项目，Pegasus的灵活性：两个用于最大值。紧凑型移动映射解决方案用于汽车和四方，到达普通汽车会卡住的越野位置。

“ Leica Pegasus：两个可以安装在汽车，船上或其他任何其他车辆上。从车辆迁移时，不必重新校准该系统，我们可以灵活，轻松地捕获毫米范围内的现实，”Kempkes Landmeten的所有者Rob Kempkes说。“Because the survey is quicker, and no safety measures have to be taken, considerable costs can be saved.”

“I have worked on this project with great pleasure. Where we used to do a traditional survey, surveyors could now drive off-road with a quad instead. They, of course, loved this,”said Erwin Perik, responsible for development.“The whole workflow was very efficient. What we captured was immediately checked – we never left the site without knowing our data was good.”

From data to a Digital Terrain Model

珀加索斯:两个几百字节包含ing point cloud data and photos were acquired for this project. The data was processed with Leica Pegasus:AutoP software, checked on quality via a multi-pass. This means the trajectory is mapped twice with the Pegasus:Two mounted on a car with opposite scanner rotation. This double-run gives a check on position quality, and reduces blind spots and unwanted traffic in the data. The resulting coloured point cloud is related to 50 ground control points and natural benchmark points.

To adjust and do quality control the data was checked on absolute position, height, completeness, spread and colouring with Leica Pegasus:Viewer and a home-made software from Kempkes Landmeten. Independent survey methods such as levelling and surveying profiles were used to doublecheck the quality.

扫描未覆盖的少数部分，例如建筑物的背面或排水管等物体，使用Leica Total Station和GNSS接收器对传统方法进行了调查。亚博5分钟快三如果在Pegasus的照片上看不到：两个。

The postprocessed data, combined with traditional surveys was then used to generate the end product for the customer – acomplete 3D Digital Terrain Model with GIS metadata。

Besides the end result that was mandatory for the assignment, Waterboard Rivierenland is now also able to use all extra gathered data, like the 360-degrees sphere photos collected with the Pegasus:Two. Thanks to the amazing source of extra information, there is no need to go outside. Where in the past the surveyor had to go back into the field, an extra cross profile can be easily generated on a location. This is quicker, safer and a perfect basis to make easier and better-informed decisions in daily processes.

Daring to disrupt

“Next-generation mobile-mapping suits Kempkes Landmeten. With both legs firmly in the river clay we are a forerunner in applying innovative techniques,”肯普斯说。“当我们做某事时，它必须是当前的，可靠的和完整的。”

使用Pegasus：事实证明，两个人更加灵活，安全，更快，可扩展性，使Kempkes Landmeten在该项目和其他项目的竞争中成为关键优势。像Leica BLK360成像激光扫描亚博ag真人规律仪和Jetstream一样，对新的现实捕获和处理解决方案进行投资，使共享点云数据更加有效。