National Exposure Information System (NEXIS) Residential Dwelling Density Exposure V15

National Exposure Information System (NEXIS) Residential Dwelling Density is a set of four raster layers representing the density of residential dwellings across Australia at different scales and resolutions. A dwelling is defined as self-contained suites of rooms including cooking and bathing facilities and intended for long-term residential use. Such dwelling units include houses-detached buildings used for long-term residential purposes-and other dwellings including flats. NEXIS collates the best publicly-available information, statistics, spatial and survey data into comprehensive and nationally-consistent exposure information datasets. Where data is limited, models are used to apply statistics based on similar areas. Exposure Information products are created at the national, state or local level to understand the elements at risk during an event or as a key input for analysis in risk assessments. NEXIS products are not intended for operational purposes at the building or individual feature level. Its strength is to provide consistent aggregated exposure information for individual event footprints or at standard community, local, state and national geographies such as the Australian Bureau of Statistics (ABS) Statistical Areas (SA) or Local Government Areas (LGA). NEXIS Building exposure information consists of Residential, Commercial and Industrial buildings. This information can be used to understand the type, use, age and structural characteristics such as number of storeys, roof type and wall type of the building stock nationally. Building exposure information can also be used to estimate population attributes such as the number of occupants, household income and other demographic indicators, as well as economic impacts based on building construction and replacement costs. The NEXIS Residential Dwelling Density is a national grid-based representation derived from the number and distribution of dwellings produced from the NEXIS residential buildings data. Dwelling density is available as a web service displaying the aggregate number of dwellings, at four different raster scales and resolutions, to show the distribution and density of residential dwellings across Australia. Resolutions include 100m, 500m, 1km and 2km rasters.Resolutions:1. Number of residential dwellings per 100sqm. Visible at zoom scales 1:250,000 minimum with no maximum. 2. Number of residential dwellings per 500sqm. Visible at zoom scales 1:700,000 minimum with 1:250,001 maximum.3. Number of residential dwellings per 1km square. Visible at zoom scales 1:3,000,000 minimum with 1:700,001 maximum. 4. Number of residential dwellings per 2km square. Visible at zoom scales with no minimum and 1:3,000,001 maximum This product is based on NEXIS version 15 (2024) data.

国家暴露信息系统（National Exposure Information System, NEXIS）住宅建筑密度数据集包含4组栅格图层，用以表征澳大利亚全境不同尺度与分辨率下的住宅单元密度。住宅单元的定义为：配备烹饪与洗浴设施、可供长期居住的独立成套房间组合；此类住宅单元包括用于长期居住的独立住宅房屋，以及公寓等其他住宅类型。
NEXIS整合最优的公开可用信息、统计数据、空间数据与调查数据，构建全面且全国统一的暴露信息数据集。当数据存在局限时，将基于相似区域的统计数据通过模型进行补全。
暴露信息产品可按国家、州或地方层级生成，用于识别事件发生时的风险承灾要素，或作为风险评估分析的核心输入项。NEXIS产品不适用于建筑物或单体要素级别的业务操作，其核心价值在于为单次事件影响范围，或标准社区、地方、州及全国级地理单元（如澳大利亚统计局（Australian Bureau of Statistics, ABS）统计区域（Statistical Areas, SA）或地方政府区域（Local Government Areas, LGA））提供统一的聚合暴露信息。
NEXIS建筑暴露信息涵盖住宅、商业与工业建筑。该信息可用于分析全国建筑存量的类型、用途、使用年限及结构特征（如楼层数、屋顶类型与墙体类型）。建筑暴露信息还可用于估算人口属性指标（如居住人数、家庭收入及其他人口统计指标），并基于建筑建造成本与重置成本评估经济影响。
本NEXIS住宅建筑密度数据集为基于全国网格的呈现形式，其数据源自NEXIS住宅建筑数据生成的住宅单元数量与分布情况。住宅密度数据以Web服务形式提供，可展示4种不同栅格尺度与分辨率下的住宅单元聚合数量，用以呈现澳大利亚全境住宅单元的分布与密度情况，分辨率分别为100米、500米、1千米与2千米栅格。
分辨率详情如下：
1. 每100平方米住宅单元数量：最小缩放比例为1:250000，无最大缩放限制；
2. 每500平方米住宅单元数量：最小缩放比例为1:700000，最大缩放比例为1:250001；
3. 每1平方千米住宅单元数量：最小缩放比例为1:3000000，最大缩放比例为1:700001；
4. 每2平方千米住宅单元数量：无最小缩放限制，最大缩放比例为1:3000001。
本数据集基于NEXIS 15版（2024年）数据构建。