Digital terrain models derived from UAV overflights of the fifteen NPP study sites at Jornada Basin LTER in 2019

This data package contains digital terrain models (DTMs) of each of
the 15 NPP study sites at the Jornada Basin LTER in southern New
Mexico, USA. The models were derived from raw images collected
during uncrewed aerial vehicle (UAV) overflight missions conducted
in late summer and early autumn of 2019 (1 overflight day per site).
For each site one or two missions were flown during an afternoon
using a DJI Phantom 4 UAV, and between 450 and 1300 12.4 megapixel
RGB images were captured. A subset of images captured at each site
were loaded into Agisoft Metashape software to derive DTMs using a
structure from motion method. These models do not include the
elevations of aboveground features such as vegetation and large
rocks. The raw images are not provided but can be made available via
project PIs. This data package includes one centimeter resolution
DTMs of all 15 sites as geotiff raster files. Other derived products
from these UAV missions, including orthomosaic photos, digital
elevation models, and sparse point clouds, are available in other
EDI data packages (knb-lter-jrn.210543001, knb-lter-jrn.210543002,
and knb-lter-jrn.210543004, respectively). This study is complete.

本数据包涵盖美国新墨西哥州南部霍纳达盆地长期生态研究站（Jornada Basin LTER）15个净初级生产力（Net Primary Productivity, NPP）研究样地的数字地形模型（digital terrain models, DTMs）。上述模型的原始影像采集自2019年夏末至初秋开展的无人驾驶航空器（uncrewed aerial vehicle, UAV）低空飞越任务，每个样地对应1次飞越任务。每个样地于当日下午开展1至2次飞行任务，使用DJI精灵4无人驾驶航空器（DJI Phantom 4 UAV），共采集450至1300幅1240万像素的RGB影像。将每个样地采集的部分影像导入Agisoft Metashape软件，通过运动恢复结构（structure from motion, SfM）方法生成数字地形模型。此类模型不包含植被、大型岩石等地表上方地物的高程信息。原始影像未随本数据包提供，但可通过项目首席研究员（Principal Investigators, PIs）申请获取。本数据包包含所有15个样地的1厘米分辨率数字地形模型，格式为GeoTIFF栅格文件。本次无人机飞越任务衍生的其他成果，包括正射镶嵌影像、数字高程模型以及稀疏点云，分别收录于编号为knb-lter-jrn.210543001、knb-lter-jrn.210543002及knb-lter-jrn.210543004的生态数据倡议（Environmental Data Initiative, EDI）数据包中。本研究已全部完成。