Greater Hunter Native Vegetation Mapping with Classification for Mapping

## **Abstract** \n\nThe dataset was derived by the Bioregional Assessment Programme.This dataset is derived from Greater Hunter Native Vegetation Mapping supplied by NSW Office of Water on 19/12/2014. You can find a link to the parent datasets in the Lineage Field in this metadata statement. The History Field in this metadata statement describes how this dataset was derived.\n\n\n\nThis is essentially the same as the original dataset (see History) except an additional field (Map _Class) has been added to the polygon attribute table where the source vegetation classes have been collapsed into fewer more generic classes to facilitate the production of report map image.\n\n\n\nAdditionally there is a 50m rasterised version of the re-classified data (HUN_GHM_Veg_50m) derved from the Map_Class field of the polygon features. This was generated to facilitate timely redrawing of the feature layer in the report map MXD.\n\n## **Dataset History** \n\nThe GHM geodatabase builds on a wealth of information and previous mapping from the Hunter region. Existing field data, mapping, classification and remote sensing interpretation \n\nwere augmented with new survey data to produce the vegetation community classification used in this project. The classification used a series of well documented analyses as well as \n\nexpert review to achieve its end-point. This document contains descriptions of the 252 native vegetation communities resulting from the data analysis and classification process. \n\nThe GHM geodatabase contains two principal vegetation layers. The GHM Vegetation Type layer and the Canopy Cover (v2) layer (individual tree crowns or clumps of tree crowns). The \n\nGHM also contains field plot localities, associated species information and plot-specific photographs. Data specific to each polygon (e.g. crown cover) and to each native vegetation \n\ncommunity type (e.g. common name, scientific name) are included. \n\nPolygons, the fundamental spatial units, are built from computer-based feature recognition which delineates landscapes patterns. The GHM Vegetation Type map is built by attributing \n\nindividual polygons with vegetation type from the GHM floristic classification through a multi-stage process. The process includes visual interpretation of SPOT 5 and ADS40 imagery as \n\nwell as species distribution modelling and expert review. \n\nThe project included a review of existing mapping and classification and established equivalences between these and the GHM Classification. This was done for two main \n\nreasons; to allow the mapping team to draw the maximum benefit from existing mapping and, to ensure that mapping currently in common use has a recorded and explicit \n\nrelationship with the current products. This is important considering that much of this existing mapping is at a very fine scale and may represent sub-classes of the GHM Classification. \n\nThis document provides users with a description of 'standard' products and also provides examples of how more advanced use may be made of the GHM.\n\n\n\nIn addition to the source polygon data, a 50m rasterised version of the Map Class has been included to facilitate fast re-draw for the large scale report map production.\n\n\n\nA comprehensive account of the lineage of this data is give in the accompanying document GHM_v4p0_Geodatabase_Guide_070812.pdf included in this dataset.\n\n## **Dataset Citation** \n\nBioregional Assessment Programme (2014) Greater Hunter Native Vegetation Mapping with Classification for Mapping. Bioregional Assessment Derived Dataset. Viewed 13 March 2019, http://data.bioregionalassessments.gov.au/dataset/73abc2f6-1b8a-43a0-b458-c67ee4275edc.\n\n## **Dataset Ancestors** \n\n* **Derived From** [Greater Hunter Native Vegetation Mapping](https://data.gov.au/data/dataset/8f575981-3730-4989-84ce-c90204158406)\n\n

**摘要**
本数据集由生物区域评估计划（Bioregional Assessment Programme）编制，其源数据为2014年12月19日由新南威尔士州水资源办公室（NSW Office of Water）提供的《大亨特原生植被制图（Greater Hunter Native Vegetation Mapping）》。您可在本元数据声明（metadata statement）的谱系字段（Lineage Field）中找到父数据集的链接，元数据声明中的历史字段（History Field）则说明了本数据集的衍生过程。

本数据集与原始数据集（详见历史字段）基本一致，仅在多边形属性表中新增了“地图类别（Map_Class）”字段：将源植被类别合并为更少的通用类别，以辅助生成报告用地图图像。

此外，还基于多边形要素的Map_Class字段生成了重分类后数据的50米栅格版本（HUN_GHM_Veg_50m），以实现报告地图MXD中要素图层的及时重绘。

**数据集历史**
GHM地理数据库（geodatabase）依托亨特地区丰富的历史资料与既往制图成果构建。本项目所用的植被群落分类体系（vegetation community classification），是在现有野外调查数据、制图成果、分类方案及遥感解译（remote sensing interpretation）结果的基础上，补充新的实测调查数据后形成的。该分类体系通过一系列有据可依的分析流程与专家评审，最终确定了252种原生植被群落，本文件即对这些群落进行了详细说明。

GHM地理数据库包含两类核心植被图层：GHM植被类型图层与冠层覆盖度（Canopy Cover，v2）图层（分别对应单棵树冠或树冠簇）。此外，数据库还收录了样地位置、关联物种信息及样地专属照片。每一个多边形的专属数据（如冠层覆盖度）及每一类原生植被群落的专属数据（如通用名、学名）均已收录。

作为基础空间单元（spatial units）的多边形，通过基于计算机的要素识别（feature recognition）技术勾勒景观格局生成。GHM植被类型图的制作则通过多阶段流程，为每个多边形赋予GHM植物区系分类体系中的植被类型属性。该流程涵盖SPOT 5与ADS40影像的目视解译（visual interpretation）、物种分布建模（species distribution modelling）及专家评审。

本项目对现有制图与分类体系进行了梳理，并建立了其与GHM分类体系的对应关系。此举主要出于两个目的：一是让制图团队最大限度利用现有制图成果，二是确保当前通用的制图数据与本项目产出的成果之间存在可追溯且明确的关联。鉴于多数现有制图的分辨率极高，可能仅对应GHM分类体系中的子类，因此这一步骤至关重要。

本文件既为用户提供了“标准”产品的说明，也展示了GHM数据库的高级应用场景。

除源多边形数据外，本数据集还收录了Map_Class字段对应的50米栅格版本，以加快大型报告地图制作时的图层重绘速度。

本数据集附带的《GHM_v4p0_Geodatabase_Guide_070812.pdf》文件中，对本数据的完整谱系进行了详细说明。

**数据集引用**
生物区域评估计划（Bioregional Assessment Programme）（2014）《带分类体系的大亨特原生植被制图（Greater Hunter Native Vegetation Mapping with Classification for Mapping）》，生物区域评估衍生数据集，2019年3月13日查阅，http://data.bioregionalassessments.gov.au/dataset/73abc2f6-1b8a-43a0-b458-c67ee4275edc。

**数据集父源**
* **源自** [大亨特原生植被制图（Greater Hunter Native Vegetation Mapping）](https://data.gov.au/data/dataset/8f575981-3730-4989-84ce-c90204158406)