1995-2002 The Marine Conservation Society - Seasearch, Various locations in Dorset, Diver observations and detailed survey records

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.
The Event Ref codes for these 1995-2002 Dorset Seasearch records are a combination of the siteID from the old Dorset marine database, and the record number from the paper form (where stated) i.e. Old Dorset ID/Seasearch Form number.
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.

Seasearch是一项针对英国休闲水肺潜水员的海洋栖息地和物种记录项目。该调查的主要目的是收集有关英国海岸周边海洋栖息地和物种的信息，以协助了解其已知范围和分布，并最终为它们的保护作出贡献。Seasearch由国家海洋保护协会统筹协调。多塞特Seasearch自1995年起活跃至今。原始调查表格由多塞特野生动物信托基金会保存，副本存放在多塞特环境记录中心。1995年至2002年多塞特Seasearch记录的事件参考代码是旧多塞特海洋数据库中的siteID与纸质表格中的记录号码的组合（如所述），即旧多塞特ID/Seasearch表格号码。请注意：所有这些Seasearch记录最初均输入到旧多塞特数据库中，并于2003年4月转换为Marine Recorder v2。旧多塞特数据库仅存储为东经和北纬值的地理位置，尽管记录是以经纬度形式进行的。结果是，所有这些Seasearch记录默认具有OS参考坐标系统，尽管原始文件记录的是经纬度。对于OSGB36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，因此尽可能将这些位置重新输入其原始经纬度。当未说明经纬度基准时，这些记录未作更改，因为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。请在调查事件屏幕上的“派生自”字段中澄清如何记录现场位置。