CGLS-LC100m

From Wiki-WindPRO
Jump to: navigation, search

Introduction

Example: Roughness Lines in windPRO based on CGLS-LC100m 2015
The CGLS-LC100 is a dynamic land cover map at 100m resolution and a part of the product portfolio for the Copernicus Global Land Service (CGLS) [1]. It has the target to deliver a yearly, global land cover map which primarily will be based based on PROBA-V – and later to be merged and replaced by Sentinel-2 satellite sources. Currently (2018), a demonstration map covering the continent of Africa has been released. This map was derived from PROBA-V time series combined with local land cover training datasets as well as ancillary datasets.

Spatial and Temporal Coverage

Coverage for the demonstration dataset is the continent of Africa for the year of 2015.
Later the coverage will become global and be at a yearly release schedule. It is based on a 100 m x 100 m grid.

Roadmap

Demonstration dataset for Africa was released in ultimo 2017.
In 2018, adaption of the retrieval methodology to Sentinel-2 data is planned and release of the dataset with global coverage.

Validation

The product user manual [2] holds data from the product validation – and compares towards other available global land cover maps. Based on data from 3887 reference points, the CGLS-LS100 data come out with the best overall agreement to the ‘ground truth’ data. The overall agreement is as follows:

Table: Validation of CGLS-LS100m
Dataset Name GlobCover 2009 LC-CCI 2010 MODIS 2010 Globeland 2010 CGLS-LC100
Agreement [%] 50.8 55.5 63.0 57.2 66.0

Legends

The legend is based on the UN LCCS (United Nations Land Cover Classification System).
For the CGLS-LS100 main land cover product, it holds 18 classes, see the sample map image for Tenerife above.

Table: CGLS-LC100 with Roughness Classification Data by EMD
ID Land Cover Type EMD Roughness Length Definition UN LCSS
0 No data z0=NA NA
20 Shrubs z0=0.700 These are woody perennial plants with persistent and woody stems and without any defined main stem being less than 5 m tall. The shrub foliage can be either evergreen or deciduous.
30 Herbaceous vegetation z0=0.500 Plants without persistent stem or shoots above ground and lacking definite firm structure. Tree and shrub cover is less than 10%.
40 Cropland z0=0.100 Lands covered with temporary crops followed by harvest and a bare soil period (e.g., single and multiple cropping systems). Note that perennial woody crops will be classified as the appropriate forest or shrub land cover type.
50 Urban / built up z0=0.400 Land covered by buildings and other man-made structures.
60 Bare/sparse vegetation z0=0.020 Lands with exposed soil, sand, or rocks and never has more than 10% vegetated cover during any time of the year.
70 Snow and ice z0=0.001 Lands under snow or ice cover throughout the year.
80 Water bodies - permanent z0=0.0002 Lakes, reservoirs, and rivers. Can be either fresh or salt-water bodies.
81 Water bodies - temporary z0=0.030
90 Wetland - herbaceous z0=0.100 Lands with a permanent mixture of water and herbaceous or woody vegetation. The vegetation can be present in either salt, brackish, or fresh water.
111 Forest, closed, evergreen needle leaf z0=0.500 Tree canopy >70%, almost all needle leaf trees remain green all year. Canopy is never without green foliage.
112 Forest, closed, evergreen, broad leaf z0=0.500 Tree canopy >70%, almost all broadleaf trees remain green year round. Canopy is never without green foliage.
113 Forest, closed, deciduous, needle leaf z0=0.500 Tree canopy >70%, consists of seasonal needle leaf tree communities with an annual cycle of leaf-on and leaf-off periods
114 Forest, closed, deciduous, broad leaf z0=0.500 Tree canopy >70%, consists of seasonal broadleaf tree communities with an annual cycle of leaf-on and leaf-off periods
121 Forest, open, evergreen, needle leaf z0=0.400 Top layer- trees 15-70% and second layer- mixed of shrubs and grassland, almost all needle leaf trees remain green all year. Canopy is never without green foliage.
122 Forest, open, evergreen, broad leaf z0=0.400 Top layer- trees 15-70% and second layer- mixed of shrubs and grassland, almost all broadleaf trees remain green year round. Canopy is never without green foliage.
123 Forest, open, deciduous, needle leaf z0=0.400 Top layer- trees 15-70% and second layer- mixed of shrubs and grassland, consists of seasonal needle leaf tree communities with an annual cycle of leaf-on and leaf-off periods.
124 Forest, open, deciduous, broad leaf z0=0.400 Top layer- trees 15-70% and second layer- mixed of shrubs and grassland, consists of seasonal needle leaf tree communities with an annual cycle of leaf-on and leaf-off periods.
200 Open Sea z0=0.000 Oceans, seas. Can be either fresh or salt-water bodies.
255 Not classified z0=NA NA

Data License

Data from the Global Land Service is subjected to the free and open access policy from the European Union’s Copernicus Regulation (see here: http://www.copernicus.eu/library/detail/248).
Please use one of these attributions when using the CGLS-LC100 data.

  1. Contains modified Copernicus Service information [2018]
  2. This product was generated by the Global Land Service of Copernicus, the Earth Observation programme of the European Commission. The research leading to the current version of the product has received funding from various European Commission Research and Technical Development programs. The product is based on PROBA-V data provided by ESA and distributed by VITO.

Acknowledgement

  1. The European Commission and the Copernicus team are acknowledged for the development and release of the free and open Copernicus data.
  2. Developement of this dataset was supported through the InnoWind project (www.innowind.dk), which is co-funded by the Danish Innovation Fund

References

  1. Copernicus Global Land Service, available at: https://land.copernicus.eu
  2. Copernicus Global Land Operations “Vegetation and Energy” – Product User Manual – Moderate Dynamic Land Cover 100m, Version I1.00, 2017-09-28
  3. InnoWind project, http://www.innowind.dk