Data from: UAS imagery protocols to map vegetation are transferable between dryland sites across an elevational gradient

This dataset consists of point intercept data, sampled with a point frame, from three 1 ha sites along an elevation and precipitation gradient within Reynolds Creek Experimental Watershed collected between late May and mid July, 2019. The lowest elevation site ('wbs1', 1,425 m) was vegetated by shrub steppe dominated Wyoming big sage (Artemisia tridentata ssp. wyomingensis). Vegetation at the middle elevation site ('los1', 1,680 m) was shrub steppe dominated by low sage (Artemisia arbuscula). Shrub steppe at the highest elevation site ('mbs1', 2,110 m) was dominated by mountain big sage (Artemisia tridentata ssp. vaseyana) and Utah snowberry (Symphoricarpos oreophilus utahensis). At each site 30 randomly located square 1 m^2 plots were sampled. The plots were oriented with one axis randomly chosen from 45, 90, 135, 180, 225, 270, 315 and 360 degrees north azimuth. A point frame of 20 pins was orientated perpendicular to the azimuth and each pin was lowered through the canopy and each contact was recorded to species or other plant material category. Whether the contacted material was photosynthetic (coded as a '+') or non-photosynthetic (coded as '-') was also recorded. Last seasons senesced plant material that is alive but not photosynthetic is coded as '.'. There may be 0, 1, 2 or more canopy hits for each pin (numbered 1 through n with 1 being the top-most canopy hit). A final basal hit is recorded for each pin and coded as hit 0. The point frame was moved so that a total of 5 rows were recorded for a total of 100 pins for each plot. The plant species codes used follow the USDA Plants Database.

该数据集包含2019年5月下旬至7月中旬在雷诺兹溪实验流域（Reynolds Creek Experimental Watershed）内沿海拔与降水梯度分布的三个1公顷站点的点截数据（point intercept data），数据通过点框（point frame）采样获取。海拔最低的站点（'wbs1'，1425米）植被为灌木草原（shrub steppe），以怀俄明大蒿（Artemisia tridentata ssp. wyomingensis）为主；海拔中等的站点（'los1'，1680米）植被为灌木草原，以矮蒿（Artemisia arbuscula）为主；海拔最高的站点（'mbs1'，2110米）的灌木草原则以山地大蒿（Artemisia tridentata ssp. vaseyana）和犹他雪果（Symphoricarpos oreophilus utahensis）为主。每个站点随机设置30个1平方米的方形样方进行采样，样方的一个轴方向从北方位角45°、90°、135°、180°、225°、270°、315°和360°中随机选择。将包含20根针的点框垂直于方位角放置，每根针穿过冠层（canopy）时，记录其接触到的物种或其他植物材料类别，同时记录接触材料是否为光合型（编码为“+”）或非光合型（编码为“-”）。上一季衰老但仍存活的非光合植物材料编码为“.”。每根针可能有0、1、2次或更多次冠层接触（编号从1到n，1表示最顶层的冠层接触），还记录最终的基部接触，编码为接触0。移动点框，每个样方共记录5行，总计100根针的数据。所用植物物种编码遵循美国农业部植物数据库（USDA Plants Database）。