Bioregional_Assessment_Programme_GIP - Catchment Scale Land Use of Australia 2014 for the Gippsland Basin bioregion

## **Abstract** \n\nThis dataset was derived by the Bioregional Assessment Programme from the Catchment Scale Land Use of Australia - 2014 dataset (GUID: 6f72f73c-8a61-4ae9-b8b5-3f67ec918826). 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 dataset includes:\n\n1. A clip of the dataset 'Catchment Scale Land Use of Australia - 2014' to the Gippsland Basin bioregion boundary\n\n2. Two tables showing land use statistics for the Gippsland Basin bioregion (primary and secondary land use classification)\n\n## **Dataset History** \n\nThe Catchment Scale Land Use of Australia - 2014 (https://data.bioregionalassessments.gov.au/datastore/dataset/6f72f73c-8a61-4ae9-b8b5-3f67ec918826) was clipped by the Gippsland Basin bioregion project boundary (https://data.bioregionalassessments.gov.au/dataset/e8a2d577-c5c5-4e2c-b0fa-53e4b2d4a034) in ArcMap using 'Extract by Mask'. \n\n\n\nStatistics for each land use type were derived from the clipped dataset by:\n\n1. Using the 'Summary Statistics (Analysis)' tool in ArcMap with the follwing inputs: Statistics Field = 'COUNT', Statistic Type = SUM. The tool was run twice, once for the Primary classification and once for Secondary, producing two output tables.\n\n2. In each table a new field 'AREA_SQ_KM' was added and the area calculated in the Field Calculator using the following equation \\[SUM_COUNT\\]\\*0.0025 (because the SUM_COUNT field indicates the number of 50mx50m grid cells).\n\n3. The percentage of total Gippsland Basin Bioregion area covered by each land use type was then calculated in a new field (AREA_PERC) using (\\[AREA_SQ_KM\\]/14607.81)\\*100 in the field calculator.\n\n## **Dataset Citation** \n\nBioregional Assessment Programme (2014) Bioregional_Assessment_Programme_GIP - Catchment Scale Land Use of Australia 2014 for the Gippsland Basin bioregion. Bioregional Assessment Derived Dataset. Viewed 21 December 2017, http://data.bioregionalassessments.gov.au/dataset/ea977ea8-24e5-48fb-a71d-f4a9021bf871.\n\n## **Dataset Ancestors** \n\n* **Derived From** [Victoria - Seamless Geology 2014](https://data.gov.au/data/dataset/2872d02e-66cb-42b6-9e5a-63abc8ad871b)\n\n* **Derived From** [Gippsland Project boundary](https://data.gov.au/data/dataset/27413de5-d13a-4231-ac79-fc77f4cbb5f7)\n\n* **Derived From** [Bioregional_Assessment_Programme_Catchment Scale Land Use of Australia - 2014](https://data.gov.au/data/dataset/6f72f73c-8a61-4ae9-b8b5-3f67ec918826)\n\n* **Derived From** [GEODATA TOPO 250K Series 3](https://data.gov.au/data/dataset/a0650f18-518a-4b99-a553-44f82f28bb5f)\n\n

## **摘要**

本数据集由生物区域评估计划（Bioregional Assessment Programme）从《澳大利亚集水区尺度土地利用——2014》数据集（GUID：6f72f73c-8a61-4ae9-b8b5-3f67ec918826）衍生而来。您可在本元数据声明的谱系字段（Lineage Field）中找到父数据集的链接，历史字段（History Field）则描述了本数据集的衍生过程。

本数据集包含：

1. 《澳大利亚集水区尺度土地利用——2014》数据集针对吉普斯兰盆地（Gippsland Basin）生物区域边界的裁剪版

2. 两张表格，展示吉普斯兰盆地生物区域的土地利用统计数据（含一级和二级土地利用分类）

## **数据集历史**

《澳大利亚集水区尺度土地利用——2014》数据集（链接：https://data.bioregionalassessments.gov.au/datastore/dataset/6f72f73c-8a61-4ae9-b8b5-3f67ec918826）通过ArcMap软件的“按掩膜提取”（Extract by Mask）工具，以吉普斯兰盆地生物区域项目边界（链接：https://data.bioregionalassessments.gov.au/dataset/e8a2d577-c5c5-4e2c-b0fa-53e4b2d4a034）为掩膜进行裁剪。

每种土地利用类型的统计数据从裁剪后的数据集衍生而来，步骤如下：

1. 使用ArcMap中的“汇总统计（分析）”（Summary Statistics (Analysis)）工具，统计字段为“COUNT”，统计类型为“SUM”。该工具运行两次，分别针对一级分类和二级分类，生成两张输出表格。

2. 在每张表格中添加新字段“AREA_SQ_KM”，并通过字段计算器使用公式[SUM_COUNT]×0.0025计算面积（因SUM_COUNT字段表示50米×50米网格单元的数量）。

3. 随后在新字段（AREA_PERC）中通过字段计算器使用公式（[AREA_SQ_KM]/14607.81）×100，计算每种土地利用类型占吉普斯兰盆地生物区域总面积的百分比。

## **数据集引用**

生物区域评估计划（2014）。Bioregional_Assessment_Programme_GIP——2014年澳大利亚吉普斯兰盆地生物区域集水区尺度土地利用数据集。生物区域评估衍生数据集。查阅日期：2017年12月21日，http://data.bioregionalassessments.gov.au/dataset/ea977ea8-24e5-48fb-a71d-f4a9021bf871。

## **数据集祖先**

* **衍生自** [维多利亚州——2014年无缝地质数据集](https://data.gov.au/data/dataset/2872d02e-66cb-42b6-9e5a-63abc8ad871b)

* **衍生自** [吉普斯兰项目边界](https://data.gov.au/data/dataset/27413de5-d13a-4231-ac79-fc77f4cbb5f7)

* **衍生自** [生物区域评估计划——澳大利亚集水区尺度土地利用2014](https://data.gov.au/data/dataset/6f72f73c-8a61-4ae9-b8b5-3f67ec918826)

* **衍生自** [GEODATA TOPO 250K Series 3](https://data.gov.au/data/dataset/a0650f18-518a-4b99-a553-44f82f28bb5f)