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Datetime of change: November 15, 2021 - 13:39

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Description:

Vegetation Phenology in Finland

by Kristin Böttcher

Datasets present the yearly maps of the start of vegetation active period (VAP) in coniferous forests and deciduous vegetation during 2001-2019 in Finland. The start of the vegetation active period is defined as the day when coniferous trees start to photosynthesize and for deciduous vegetation as the day when trees unfold new leaves in spring. The datasets were derived from satellite observations of the Moderate Resolution Imaging Spectroradiome ...

Last update: November 15, 2021 - 13:39

Data: netCDF (303.17kB)
Metadata: ACDD (JSON) | EML (XML)

BorealGreen-upPhenologyVegetationStart of season

General information
EBV attributes

Title * The title of the dataset.

Date of creation * The date on which this version of the data was created in YYYY-MM-DD format.

Summary * A paragraph describing the dataset.

References Provide the DOI number of the dataset and/or associated publications.

https://doi.org/

Provenance * The method of production of the original data. At the minimum if it was model-generated, should name the model and its version. If it is observational, it should characterize it. A complete description would detail the multiple steps needed to generate the data. For each step it should give type of step (dataset, code, software or description of protocol), access (open or restricted) and link to code and/or publications (DOI or URL or Github).

Moderate Resolution Imaging Spectrometer (MODIS) Terra Level 1B (1 km, 500 m) were manually selected from the Level-1 and Atmosphere Archive and Distribution System (LAADS DAAC). From 2009 onwards data were obtained from the satellite receiving station of the Finnish Meteorological Institute (FMI) in Sodankylä, Finland and gap-filled with data from LAADS DAAC. MODIS Level 1B data were calibrated to top-of-atmosphere reflectances and projected to a geographic latitude/longitude grid (datum WGS-84) using the software envimon by Technical Research Centre of Finland (VTT). Fractional Snow Cover (FSC) and the Normalized Difference Water Index (NDWI) were calculated from MODIS top-of-atmosphere reflectances. Cloud covered observations were removed using an automatic cloud masking algorithm by the Finnish Environment Institute.
 For the extraction of the start of the VAP in coniferous forest, FSC was averaged at a spatial resolution of 0.05 x 0.05 degrees for the MODIS pixels with dominant coverage of coniferous forest. A sigmoid function was fitted to the averaged FSC-time series and the start of the VAP was determined based on a threshold value. For the extraction of the VAP in deciduous vegetation, daily NDWI time series were averaged for MODIS pixels with vegetation cover into the same spatial grid (0.05 x 0.05 degrees). The day of the VAP was determined from NDWI time series based on a threshold value. The yearly maps of the VAP were smoothed with a median filter to remove spurious outliers and fill spatial gaps. Open water areas were masked.

Coverage Content Type * The coverage content type describes the general content type of the resource.

Processing Level A textual description of the processing (or quality control) level of the data.

Project Name The name of the Project.

Project URL The URL to the Project (Webpage/GitHub etc.)

Creator Name * The name of the person or other creator type principally responsible for creating this data.

Creator Email The email of the person or other creator type principally responsible for creating this data.

Creator Institution *

Co-creators The names of the co-creators responsible for creating this data.

License * Select between Creative Commons (CC) or Non-CC license.

Vegetation Phenology in Finland

Essential Biodiversity Variables

Biological entity

Metric

Scenario

Spatial domain

Temporal domain

Environmental domain *