Land resource map – AR50 Series

AR50 is a nationwide data set that shows the main types of land resources adapted to use in scales from 1:20 000 to 1:100 000. The dataset consists of the following properties that can be used to produce map layers with predefined presentation rules (sld files): land type (ARTYPE), agriculture (ARJORDUS), tree species (ARTRESLAG), forestry (ARSKOGBON) and snaumark (ARVEGET). The AR50 is produced by a generalisation of FKB-AR5 under the tree line and the interpretation of satellite images across the tree line. For classification of tree species, N50 forest has been used without registered tree species where there is no AR5. Figures that are less than 15 acres do not appear on the map but are merged with adjacent areas. The AR50 is therefore not suitable for spatial analysis or production of land-use statistics. The AR50 has been updated approximately every three years with the latest annual version of FKB-AR5. Production is fully automated and based on a complex rule-based production trail for compiling the datasets. The most recent version of the AR50 was published in May 2022 with data from AR5 and N50 from 31.12.2021, as well as the new AR-FJELL2. The satellite images are from the period 2020 and 2022 (Sentinel 2 satellite). The production loop was then rewritten with new code. The code is adjusted to changes in input data sets. The generalised figures will therefore differ slightly from previous versions. In addition, there is topological correction including smoothing of the figures. Data is downloaded as county or municipal files. The first version of the AR50-year version 2010 was produced by AR5 and N50 as of 31.12.2010, as well as AR-FJELL with satellite imagery (IMAGE2000) from the period 1994 and 2006. It has since made annual versions 2013 (AR5 and N50 as of 31.12.2013) and annual versions 2016 (AR5 and N50 as of 31.12.2016). AR-FJELL has not been updated since 2010. The latest update of the first version of the AR50 has data from 31.12.2016.AR50是一套全国性数据集，可适配1:20000至1:100000比例尺，展示主要土地资源类型。 该数据集包含以下可用于生成带有预定义样式规则的地图图层（sld文件）的属性字段：土地类型（ARTYPE）、农业用地（ARJORDUS）、树木种类（ARTRESLAG）、林业用地（ARSKOGBON）以及无树草原（ARVEGET）。AR50通过对林线以下的FKB-AR5进行综合概括，以及对林线以上区域的卫星影像解译生成。在树木种类分类中，对于无AR5数据的区域，采用了N50森林数据但未标注具体树种。面积小于15英亩的图斑不会在地图中显示，而是与相邻区域合并，因此AR50不适用于空间分析或土地利用统计数据的生产。 AR50约每三年更新一次，采用最新年度版FKB-AR5数据。其生产流程完全自动化，依托一套复杂的基于规则的数据集编制生产链路。最新版AR50于2022年5月发布，所用数据包含2021年12月31日的AR5与N50数据集，以及新增的AR-FJELL2。所用卫星影像取自2020年至2022年的哨兵2号卫星（Sentinel 2）。此次生产流程采用全新代码重写，并针对输入数据集的变化进行了调整，因此经综合概括后的图斑与过往版本存在细微差异。此外，还包含拓扑校正，包括图斑边界平滑处理。 数据可按县或市为单位下载为单独文件。 AR50的首个版本——2010年版，基于2010年12月31日的AR5与N50数据，以及搭载1994年至2006年卫星影像（IMAGE2000）的AR-FJELL数据制作。此后陆续推出2013年度版（基于2013年12月31日的AR5与N50数据）与2016年度版（基于2016年12月31日的AR5与N50数据）。AR-FJELL自2010年起未再进行更新，AR50首个版本的最新更新数据截至2016年12月31日。