Red Crab Migration Infrastructure - Crab Crossings & Gates – 2012

Information on the location of red crab crossing grids and migration gates were provided to Geoscience Australia by Christmas Island National Park in July 2012 as shapefiles. The only changes made to the data were to move eight grid points to line up with the orthophotography. For these edited points, the ‘x’ and ‘y’ fields were updated using the Field Calculator in Quantum GIS. Attributes include; road name, fence name, type of infrastructure and x and y coordinates. Accuracy is high as the layer was based on the 2011 orthophotography. [Disclaimer]( https://www.infrastructure.gov.au/utilities/disclaimer.aspx)2012年7月，圣诞岛国家公园（Christmas Island National Park）向澳大利亚地球科学局（Geoscience Australia）提供了红蟹穿越网格及迁徙通道的空间位置信息，数据以形状文件（shapefiles）格式交付。对该数据集仅作出一项修改：调整8个网格点位以与正射影像（orthophotography）对齐。针对这些经编辑的点位，工作人员通过量子地理信息系统（Quantum GIS）中的字段计算器更新了其"x"与"y"坐标字段。数据集的属性信息包含道路名称、围栏名称、基础设施类型以及x、y坐标。 由于该空间图层基于2011年正射影像制作，因此定位精度较高。 [免责声明](https://www.infrastructure.gov.au/utilities/disclaimer.aspx)