Northland's Erosion and Sediment Risk - property scale
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This raster represents a continuous composite susceptibility surface based on two SPAL indicators: MADZ-derived regolith activity (i.e. landscape structural instability indicating geological risk) and the OLF (indicating sediment runoff) index. Equal weighting was applied to both inputs: Composite Score = 0.5 × Activity + 0.5 × OLF The resulting surface was scaled from approximately 1.32 to 4.95 (higher values = higher susceptibility), yielding a continuous measure of erosion susceptibility across the landscape. This supports prioritisation and interpretation at fine spatial resolution. For details see the Land & Water Science report (Gunn and Rissmann 2025) - Northland Erosion and Sediment Risk Map - Metadata Report LWS 2026.pdf Author: Dr Clint Rissmann (Land & Water Science) Extent: Whole Northland Projection: NZTM (EPSG:2193) Version: Version 2.0 Date Created: July 2025 Date Modified: N/A NRC Team (if applicable): Natural Resources Science Team Subject Matter Expert: Clint Rissmann – Landscape Scientist File Size: 1.91 GB Raster Metadata Summary: CRS: NZGD2000 / New Zealand Transverse Mercator (EPSG:2193) Pixel Size: 5 m × 5 m Raster Dimensions: 35,661 (width) × 44,551 (height) Extent: 1567222.5000, 5971572.5000 to 1745527.5000, 6194327.5000 GDAL Driver: GTiff (GeoTIFF) Compression: LZW Statistics: Min = 1.3167, Max = 4.9504, Mean = 4.0059, StdDev = 0.1441 Valid Data Coverage: 31.27%
本栅格数据为基于两项SPAL指标构建的连续复合易感性表面：其一为源自MADZ的表土活动度（即表征地质风险的地表结构不稳定性），其二为表征沉积物径流的OLF指数。两项输入指标采用等权重赋值：复合得分=0.5×活动度+0.5×OLF指数。所得表面的数值范围约为1.32至4.95（数值越高则侵蚀易感性越强），由此得到覆盖全区域的侵蚀易感性连续度量结果。该数据可支持高空间分辨率下的优先级划分与解译工作。 详细信息请参阅Land & Water Science报告（Gunn与Rissmann，2025）——Northland Erosion and Sediment Risk Map - Metadata Report LWS 2026.pdf。 作者：Clint Rissmann博士（Land & Water Science） 覆盖范围：全域Northland地区 投影方式：NZTM（EPSG:2193） 版本：2.0版 创建日期：2025年7月 修改日期：无 NRC团队（如适用）：自然资源科学团队 主题专家：Clint Rissmann——景观科学家 文件大小：1.91 GB 栅格元数据摘要： 坐标参考系（CRS）：NZGD2000 / 新西兰横墨卡托投影（EPSG:2193） 像素尺寸：5米×5米 栅格维度：35661（宽）×44551（高） 覆盖范围：1567222.5000, 5971572.5000 至 1745527.5000, 6194327.5000 GDAL驱动：GTiff（GeoTIFF） 压缩方式：LZW 统计信息：最小值=1.3167，最大值=4.9504，平均值=4.0059，标准差=0.1441 有效数据覆盖率：31.27%
