North West Shelf Joint Environmental Management Study:InVitro Inputs - Bathymetry

The Auslig 250k series 1 Topograpic data (Geoscience Australia 2000) was used along with a North West Shelf coastline contour to generate a 0.008 degree grid using the ArcInfo topogrid command. This was merged with the AGSO bathymetric 30 second grid (Geoscience Australia) to form a complete bathymetric and topographic grid at 0.008 degree resolution for the complete North West Shelf study area. Finally this grid was projected to a Lambert Conformal Conic projection for use by the model. Conformal projections, ensure that scale is invariant in all directions locally, but large grids/areas will be distorted because of differential 'stretching' of areas across large scales.

本研究采用澳大利亚地质调查局（Geoscience Australia）2000年发布的Auslig 250k序列1地形数据，结合西北大陆架海岸线等高线，通过ArcInfo地形网格命令（ArcInfo topogrid）生成0.008度分辨率的网格。随后将该网格与AGSO水深30秒网格（AGSO bathymetric 30-second grid，澳大利亚地质调查局）融合，得到覆盖完整西北大陆架研究区、分辨率为0.008度的综合地形-水深网格。最后将该网格投影至兰勃特等角圆锥投影（Lambert Conformal Conic projection）以适配模型使用。等角投影可确保局部范围内各方向的比例尺保持恒定，但由于大尺度下区域会发生差异化“拉伸”，大型网格或大范围区域将出现投影变形。