Extant natural vegetation for Ashford, Bingara, Inverell and Yallaroi VIS_ID 3794

Extant natural vegetation is mapped to local scale plant community level in the Ashford (NSW portion), Bingara, Inverell and Yallaroi 1 : 100 000 mapsheets. The mapsheets fall within the Border Rivers/Gwydir Catchment Management Area. Extant (or existing) vegetation includes, unlike potential vegetation, derived grassland communities and human impact of urbanisation and cropping. The 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.

本数据集针对阿什福德（新南威尔士州片区）、宾加拉、因弗雷尔及亚拉罗伊的1:10万地形图幅开展现存自然植被制图，制图精度达到局域尺度植物群落级。上述地形图幅均隶属于边境河流/格威迪尔流域管理区。与潜在植被不同，现存（或现有）植被涵盖衍生草地群落以及受城市化与农耕活动人为干扰的植被类型。本次制图的技术流程如下：(i) 基于完整植物区系数据构建植物群落分类体系；(ii) 生成多环境空间图层；(iii) 将植物区系数据与环境图层相结合，构建广义相异模型（generalized dissimilarity model, GDM）这一统计模型；(iv) 借助航空摄影解译（aerial photograph interpretation, API）线稿与约束矩阵对模型结果进行约束；(v) 依据每个网格单元的最高概率值，将各群落概率图层合并为单幅自然植被分布图。本次制图采用25米的网格单元分辨率。