The only complete inventory of New Zealand glaciers was based on aerial photography starting in 1978. While there have been partial updates using 2002 and 2009 satellite data, most glaciers are still represented by the 1978 outlines in contemporary global glacier databases. The objective of this project is to establish an updated glacier inventory for New Zealand. We have used Landsat 8 OLI satellite imagery from February and March 2016 for delineating clean glaciers using a semi-automatic band ratio method and debris-covered glaciers using a maximum likelihood classification. The outlines have been checked against Sentinel-2 MSI data, which have a higher resolution. Manual post processing was necessary due to misclassifications (e.g. lakes, clouds), mapping in shadowed areas, and combining the clean and debris-covered parts into single glaciers. New Zealand glaciers cover an area of 794 ± 34 km2 in 2016 with a debris-covered area of 10%. Of the 2918 glaciers, seven glaciers are >10 km2 while 71% is <0.1 km2. The debris cover on those largest glaciers is >40%. Only 15 glaciers are located on the North Island. For a selection of glaciers, we were able to calculate the area reduction between the 1978 and 2016 inventories.

中文翻译：

---

根据 2016 年卫星图像更新了新西兰冰川冰的清单

新西兰冰川的唯一完整清单是基于 1978 年开始的航空摄影。虽然使用 2002 年和 2009 年的卫星数据进行了部分更新，但大多数冰川仍以 1978 年当代全球冰川数据库的轮廓为代表。该项目的目标是为新西兰建立一个更新的冰川清单。我们使用了 2016 年 2 月和 3 月的 Landsat 8 OLI 卫星图像，使用半自动波段比法描绘清洁冰川，使用最大似然分类描绘碎片覆盖的冰川。轮廓已根据 Sentinel-2 MSI 数据进行了检查，这些数据具有更高的分辨率。由于分类错误（例如湖泊、云）、阴影区域的映射以及将清洁和碎片覆盖的部分组合成单个冰川，手动后处理是必要的。22016 年，碎片覆盖面积为 10%。在 2918 条冰川中，有 7 条冰川大于 10 公里2而 71% 是 <0.1 公里2. 那些最大的冰川上的碎片覆盖率 > 40%。北岛只有 15 座冰川。对于选择的冰川，我们能够计算 1978 年和 2016 年清单之间的面积减少。