Extant natural vegetation for Cobbadah, Manilla and Tamworth VIS_ID 3796

Extant natural vegetation is mapped to local scale plant community level in the Cobbadah, Manilla and Tamworth 1 : 100 000 mapsheets. The mapsheets fall within the Namoi and Border Rivers/Gwydir Catchment Management Areas. Extant (or existing) vegetation includes, unlike potential vegetation, derived grassland communities and human impact of urbanisation and cropping.;\r\n;\r\nThe mapping methodology involved: (i) using full floristic data to derive a plant community classification, (ii) deriving numerous environmental spatial layers, (iii) combining floristics and environmental layers in a statistical model i.e. generalized dissimilarity model (GDM), (iv) constraining model results with aerial photograph interpretation (API) linework and a constraints matrix, and (v) combining individual community probability layers into one natural vegetation map based on the highest probability per grid cell. Mapping was conducted at a 25m grid cell resolution.

本数据集针对科巴达（Cobbadah）、马尼拉（Manilla）与塔姆沃思（Tamworth）三张1:10万比例尺地形图幅，将现存自然植被精细制图至局域尺度植物群落级别。上述地形图幅隶属于纳莫伊（Namoi）、边境河流/古迪尔（Border Rivers/Gwydir）流域管理区。与潜在植被不同，现存（或现有）植被涵盖次生草地群落，以及受城市化与农耕活动干扰的植被类型。

本次制图方法如下：(i) 利用完整的植物区系数据推导植物群落分类体系；(ii) 生成多环境空间图层；(iii) 将区系数据与环境图层整合至广义相异模型（generalized dissimilarity model, GDM）这一统计模型中；(iv) 借助航空相片解译（API）线划图与约束矩阵对模型结果进行约束；(v) 基于每个网格单元的最高概率值，将各植物群落概率图层合并为单张自然植被分布图。本次制图采用25米的网格单元分辨率。