Grey-headed Flying-fox Camp Boundaries

This dataset contains information on grey-headed and black flying-fox camp boundaries for coastal New South Wales. The data represents locations that have been used by grey-headed flying-foxes or black flying-foxes since 1990. Flying-foxes change their use of these areas from season to season and year to year. Few sites will be occupied continuously, and some may only be used every few years. The use of sites by flying-foxes will generally reflect the availability of native food (pollen and fruits of native trees). It is intended to be indicative of the location of such camps and is not exact. ;\r\n;\r\nThe majority of camp locations were documented during range-wide surveys of grey-headed flying-foxes conducted from 1998 to 2004. The dataset provides presence/absence data only, ie. it does not include abundance estimates. ;\r\n;\r\nThe flying-fox camp database is an Excel spreadsheet which contains AMG Zone 56 Eastings and Northings. The spreadsheet has been converted to a point locality GIS layer (ESRI shapefile) via these coordinates but then reprojected to GDA GCS. The AMG coordinates in the table have also been converted to MGA coordinates. ;\r\n;\r\nA polygon shapefile which is described here is also provided for camp boundaries. Camp boundaries are only present if the coverage of the camp is known. There was no set cut off size however all boundaries would be >10x10m. Camp dimensions and boundaries vary through time with changing population size and movement of animals around the site. The boundaries provided are the greatest extent documented and are not static.;\r\n;\r\nIn 2006/7 DEC engaged a contractor to update the Grey-headed Flying-fox (GHFF) and the Black Flying-fox (BFF) database for NSW. The current dataset contains information on the locations of camps known to be used by grey-headed flying-foxes as of April 2008.

本数据集涵盖新南威尔士州沿海地区灰头狐蝠（grey-headed flying-fox）与黑狐蝠（black flying-fox）的营地边界信息。数据收录了1990年以来灰头狐蝠或黑狐蝠曾使用过的场地位置。狐蝠会随季节与年度变化调整对这些区域的利用模式：极少有场地会被持续占用，部分场地可能仅每隔数年才会被使用。狐蝠对场地的利用通常与本土食物（本土树木的花粉与果实）的可获得性密切相关。本数据集仅用于指示此类营地的大致位置，并非精确坐标。

多数营地位置是通过1998年至2004年间开展的灰头狐蝠全分布范围调查所记录的。本数据集仅包含存在/不存在数据，即未提供种群丰度估算信息。

本狐蝠营地数据库为Excel电子表格，其中包含澳大利亚制图格网（AMG）56区的东向与北向坐标。该表格已通过上述坐标转换为点位地理信息系统（GIS）图层（ESRI形状文件），随后又被重投影至澳大利亚大地测量坐标系（GDA GCS）。表格中的AMG坐标也已转换为墨卡托澳大利亚格网（MGA）坐标。

本数据集同时附带本说明所述的多边形形状文件，用于表示营地边界。仅当营地覆盖范围已知时，才会生成对应的边界多边形。虽未设定统一的尺寸阈值，但所有营地边界的面积均大于10×10米。营地的尺寸与边界会随种群规模变化以及动物在场地内的移动而随时间改变，本次提供的边界为已记录的最大覆盖范围，并非固定不变的范围。

2006至2007年间，DEC聘请承包商更新了新南威尔士州灰头狐蝠（Grey-headed Flying-fox, GHFF）与黑狐蝠（Black Flying-fox, BFF）的数据库。当前数据集收录了截至2008年4月已知的灰头狐蝠与黑狐蝠营地位置信息。