测量英格兰的最高峰

作者：职员

Many keen mountaineers in Great Britain are familiar with the famous “Three Peaks” – the highest in Scotland, Wales and England:

1.本尼维斯
2.斯诺登
3. Scafell Pike

In recent times, the summits of Snowdon and Ben Nevis have been re-measured by Ordnance Survey Great Britain (OS) to validate their heights using the latest techniques.

随着2016年大不列颠三角剖分80周年，重新衡量其余元素的时候是正确的。坎布里亚郡的Scafell Pike - 英格兰的最高峰。

伸手去星星

作为ITV系列Countrywise的一部分，该节目进行了军械调查，以帮助主持人本·福格（Ben Fogle）重新衡量Scafell Pike的高度。军械调查转向Leica Geosystems的专业设备和解决方案，以帮助交付这一激动人心的项目。新的自我学习Leica GS16 GNSS智能接收器被认为是工作的最佳工具。

Scafell Pike在军械调查地图上发表的高度源自1937年在大不列颠三角剖分期间进行的测量。当前高度舍入978米。当然需要重新测量这座山。

The aim of the project was to re-measure the mountain using the latest GNSS technology. As well as giving an accurate measurement of the true height of England’s highest peak, the undertaking also validated the previous measurements taken about 79 years ago.

Fogle和外部广播团队与军械调查的一组测量师团队一起从Wasdale Head到Scafell Pike出发。他们随身携带了最新的Leica Geosystems GNSS技术，这是一种新发布的Leica GS16智能接收器，Leica CS35崎and的平板电脑以及水平和人员。这种紧凑的轻量级解决方案与这些年前原始调查中所携带的定理物相去甚远。

由于山顶的远程位置充满挑战，并且没有手机信号，因此无法使用网络RTK校正。由于距离山谷中的已知点和遮盖地形的距离，也无法通过无线电获得基地和漫游者RTK解决方案。对于最高级别的准确性，静态会话的后处理将确定计算新的高度。但是，通过使用Leica GS16接收器，也可以通过使用Leica GeoSystems提供的SmartLink服务来快速价值来计算新的高度至几厘米之内的新高度。

什么是SmartLink？

SmartLink is a Precise Point Positioning (PPP) service that enables the GNSS user to实现全球实时厘米精确定位，在全球偏远地区工作时非常理想。SmartLink不需要本地RTK基站或网络RTK基础架构来操作含义较低的设备资本投资，并且简单地使用SmartLink兼容接收器访问该站点的便利是唯一的必要条件。

How does SmartLink work?

SmartLink基于购买力平价tec尝试和测试hnique, originally developed in the early 1990s for off-shore positioning such as in the oil and gas industries where operations are usually remote – consequently away from reference stations and communications links. SmartLink includes a global network of GNSS reference stations, communications links and diverse network control centres, all with redundancy for guaranteed availability of service for critical operations.

SmartLink纠正或型号GNSS错误来源，例如电离层和对流层延迟以及卫星轨道和时钟。然后，将校正信号计算并上行到一系列七个地静止卫星，并广播到兼容的GNSS接收器，例如Scafell Pike上使用的Leica GS16。通过通过卫星提供GNSS校正，可以克服网络RTK的常见弱点（手机网络）。

Leica Geosystems的持续创新最近将使用SmartLink使用SmartLink的好处带到了土地调查社区。使用的积极副作用如果RTK数据链接中断，则智能链接特别感兴趣的常规RTK用户，例如由于移动网络繁忙或掩盖无线电链接的地形，然后SmartLink无缝弥合差距以保持不间断的百分点定位消除等待数据链接的停机时间的挫败感要恢复。

达到表现的顶峰

At the summit, the Leica GS16 was mounted on the summit trig pillar to observe satellite signals and calculate the height of the trig pillar. The versatility of the Leica GS16 also allowed the raw observations to be recorded for definitive static post-processing back at the office.

The Bernese scientific software was used for this ratification of SmartLink using precise ephemeris data, the OS Net v2009 coordinate reference frame and OSTN15/ OSGM15 transformation and geoid model. Interestingly, and to prove the quality of real-time SmartLink obtained height, the post-processing calculated height differed by only 2-4 cm.

OS Head of Multi-Media, Andy Steggall, who took part in the expedition says, “it was remarkable that the OS surveyors of yesteryear were so accurate. What was such a major physical effort then has been replaced with the precision accuracy provided by state of the art equipment now. But it shows that the tradition of dedication and commitment to getting it right burns brightly. We’re sure the story will make compelling TV. We can reveal that the new height calculated for the highest point in England is 978.072 metres Above Ordnance Datum (AOD) in accordance with the current geoid model, OSGM15.”