LiPheStream - A 16-month spatiotemporal point cloud time series of Boreal trees from Hyytiälä, Finland

The LiPheStream dataset is a 16-month-long point cloud time series comprising LiDAR point cloud data at 92 time points for 458 individual trees of three boreal species (silver birch (Betula pendula Roth.), Scots pine (Pinus sylvestris L.) and Norway spruce (Picea abies H. Karst.)). The dataset was collected using the Finnish Geospatial Institute (FGI) Lidar Phenology station (LiPhe) between April 2020 and September 2021, excluding January and February in 2021 due to the rigorous winter-weather conditions in Finland. The dataset is comprised of georeferenced individual tree point clouds containing 3D georeferenced coordinates (EPSG: 3067 – ETRS89/ TM35FIN), points return number (scalar from 1 to 15), number of returns (scalar from 1 to 15), intensity as amplitude, scan angles (theta and phi in degrees), reflectance (dB), return pulse deviation (measure of pulse shape distortion) and range (m).

LiPheStream includes the single tree time series as compressed to one zip file per tree, ordered after species (scots_pine (1), norway_spruce (2), silver_birch (3), and unidentified (4)) and quality class of the majority of time points per tree (ranging from 0-bad to 4-good). The zip-filename denotes the tree id. The single tree point cloud filenames include date and time (YYMMDD_HHMMSS) , treeID and Quality class : 'YYMMDD_HHMMSS_treeID_Species_Quality.laz'.

The LiPheStream dataset also includes additional data:
- 2 full scan area point clouds :
- Full_resampled_pointclouds includes two preprocessed resampled point clouds; one from 06.04.20 ("leaf off") and one from 15.07.20 ("leaf on")
- TreeAttributes.csv: Tree attributes and location estimated from the first point cloud in the timeseries on 06.04.20

For further information about the processing steps, please refer to LiPheKit: https://gitlab.com/fgi_nls/public/liphekit

LiPheKit SampleData includes (provided in folders that can directly be used to run LiPheKit:
- LiPhe_polygon.gpkg: A polygon covering the whole area of LiPheStream tree locations
- DTM_20cm.las: Digital Terrain Model for the LiPhe area
- 200406_100502_Sample.laz: Low resolution small area scan from 06.04.20 at 10:05 EET

LiPheStream_Catalog:
- single tree geojson files collecting the full single tree timeseries metadata, for initial queries.