2002 The Marine Conservation Society - Seasearch, Various locations in Dorset, Diver observations and detailed survey records

Seasearch survey of Dorset using mostly amateur recorders. Records subsequently validated by an expert post-survey assessor and biotopes assigned according to the MNCR 04.05 key.
Seasearch is a marine habitat and species recording project for recreational SCUBA divers in the UK. The main aim of these surveys is to gather information on the marine habitats and species surrounding the UK coast, which will assist with their known extent and distribution, and ultimately contribute towards their conservation. Seasearch is co-ordinated nationally by the Marine Conservation Society. Dorset Seasearch has been active since 1995. Original survey sheets are held by Dorset Wildlife Trust, with copies held at Dorset Environmental Records Centre.
Please note: All of these Seasearch records were originally input into the old Dorset database and were converted over to Marine Recorder v2 in April 2003. The old Dorset database only stored locations as Eastings and Northings values despite entries being made as Lat/Longs. The result is that all these Seasearch records have a Coordinate system of OS ref by default, even though the original paperwork recorded them as Lat/Longs. No accuracy has been lost for the OSGB36 Lat/Longs, as these allegedly translate directly. However, the surveys that used WGS84 Lat/Longs will have a small associated error, so where possible these locations have been re-entered with their original Lat/Longs. Where the Lat/Long datum has not been stated, these records have not been changed as the small error arising from the conversion is believed to be less than the error (~100m) between todays difference between OSGB36 and WGS84 Lat/Longs and the ~100m accuracy error before selective availability was turned off. Please use the Derived from field on the survey event screen to clarify how the location was recorded in the field.

Dorset 地区Seasearch 调查主要采用业余录音员的记录。随后由专家评估员在调查后对记录进行验证，并根据MNCR 04.05 标准对生境进行分类。Seasearch 是一项针对英国休闲潜水员的海洋栖息地及物种记录项目。这些调查的主要目的是收集有关英国海岸周围海洋栖息地和物种的信息，以协助确定其已知范围和分布，并最终促进其保护。Seasearch 由海洋保护协会在全国范围内协调。Dorset Seasearch 自1995年起活跃至今。原始调查表格由Dorset 野生动物信托基金会保存，副本存放在Dorset 环境记录中心。

请注意：所有这些Seasearch记录最初输入到旧的Dorset数据库中，并于2003年4月转换为Marine Recorder v2。旧的Dorset数据库仅存储位置为东西向和南北向的数值，尽管记录时使用的是经纬度。因此，所有这些Seasearch记录默认坐标系统为OS参考，尽管原始文件记录的是经纬度。对于OSGB36的经纬度，没有丢失精度，因为这些据说可以直接转换。然而，使用WGS84经纬度的调查将存在微小的相关误差，因此尽可能地将这些位置重新输入其原始的经纬度。对于未声明纬度基准的记录，由于转换产生的微小误差被认为小于OSGB36和WGS84经纬度之间的差异（约100米）以及选择性可用性关闭前的约100米精度误差，因此这些记录未作更改。请在调查事件屏幕上的“来源自”字段中澄清如何在现场记录位置。