Land Cover Map 2007

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Product Description:

The Land Cover Map 2007 (LCM2007) was released in July 2011 and is the CEH’s third land cover map in the series.  Similar to LCM2000, the dataset covers the whole of the UK, and provides land cover classifications based on UK Biodiversity Action Plan (BAP) Broad Habitats.  Also similar to LCM2000, the data has been produced using a parcel-based mapping technique, but with an enhanced classification methodology.  Whereas LCM2000 used only image segments to define objects, LCM2007 parcels were primarily sourced from generalised digital cartography (OS MasterMap topography layer for GB and Land & Property Services (previously OSNI) large-scale vector for NI), and then refined with image segments and other spatial datasets (e.g. DEM’s, soil data, and census boundaries).  Deriving objects from digital cartography increases the accuracy since the cartographic boundaries accurately delineate real-world land cover objects, improving the spatial accuracy.  It also helps clarify the spectral properties of the land surface and subsequently improves thematic accuracy.

 

The land cover classifications are defined by a hierarchical nomenclature with 23 main classes which are based on the UK Biodiversity Action Plan (BAP) Broad Habitats.  Where suitable based on their spectral signatures, Broad Habitats can be reliably divided further, for example ‘Built-up Areas and Gardens’ is subdivided into ‘Urban’ and ‘Suburban’ subclasses.

Three hierarchical tiers (levels) of classifications have been defined, leading to a range of varying datasets:

 Level 1

 Aggregate classes (x10)

 Level 2

 Broad Habitat classes (x23)

 Level 3

 Broad Habitat Subclasses (x58)

 Vector product  Y  Y
 Raster, 25m  Y
 Raster, 1km  Y  Y

 

Datasets Available:

The LCM2007 product is provided in a range of different data formats, spatial and thematic resolutions, in order to support a wide range of potential applications:

LCM2007 Vector Format

The vector product is the most detailed, containing 8.6 million land parcel polygons for GB and 0.9 million for NI.  Each topologically structured polygon has 10 attributes describing land cover class and metadata regarding how the classes were derived, from the original image acquisition dates and sensor type to pixel count statistics.  The vector dataset defines both the Broad Habitat land cover class (level 2), and the Broad Habitat Subclass (level 3), where applicable.

LCM2007 Raster Formats

The raster products have been derived by simplifying the vector product, and are provided at two different spatial resolutions:

  • LCM2007 raster 25m resolution

This is the ‘standard’ full resolution raster dataset, and was created by converting the vector land parcels dataset into a 25m raster grid.  This dataset provides one single raster layer of data, with each 25m x 25m pixel being assigned to the most dominant one of the 23 LCM2007 Broad Habitat land cover classes.

  • LCM2007 raster 1km resolution ‘Summary Products’

Derived from the 25m raster, more generalised 1km resolution datasets are also available.  The aggregation from 25m to 1km was undertaken by two different methods:

  • Dominant Value Rasters

Similar to the 25m data, this dataset provides one single raster layer of data, with each 1km x 1km pixel being assigned to one land cover class.  The assignment is based on which class is most dominant within the 1km pixel extent, aggregated from the 1,600 (40×40) 25m pixels within each 1km pixel.  This data is available at two different thematic resolutions:

  • LCM2007 raster 1km, dominant cover for LCM2007 Aggregated (10) land cover classes (level 1)
  • LCM2007 raster 1km, dominant cover for LCM2007 Broad Habitat (23) land cover classes (level 2)

 

  • Percentage Value Rasters

Since larger pixels are more likely to include a wider range of land cover types, this dataset provides separate raster layers for each of the land cover classes.  Within each layer, the pixel values represent the percentage of that 1km pixel designated as being of a particular land cover type.  For example, a 1km pixel is comprised of 1,600 25m pixels in the original data.  If 320 of these 1,600 pixels were of land cover type ‘marsh/rough grass’, then the layer for this class would have a value of 20 (%) for this 1km pixel.  This data is available at two different thematic resolutions:

 

  • LCM2007 raster 1km, percentage cover for LCM2007 Aggregated (10) land cover classes (level 1)
  • LCM2007 raster 1km, percentage cover for LCM2007 Broad Habitat (23) land cover classes (level 2)

 

Please note that all LCM2007 dataset versions are supplied in two parts: a GB dataset in British National Grid projection, and an NI dataset in Irish National Grid projection.

 

Summary of LCM2007 datasets available:

 

 Data Structure  Land cover classes  Raster Resolution  Raster Layers  Value Type  Data Types
 Vector  58 Broad Habitat Subclasses (level 3)  N/A  N/A  Dominant  Vector (polygons)
 Raster  23 Broad Habitat Class (level 2)  25m  1  Dominant  Raster grid
 Raster  10 Aggregated Class (level 1)  1km  1  Dominant  Raster grid
 Raster  10 Aggregated Class (level 1)  1km  10  Percentage  Raster grid
 Raster  23 Broad Habitat Class (level 2)  1km  1  Dominant  Raster grid
 Raster  23 Broad Habitat Class (level 2)  1km  23  Percentage  Raster grid

 

Dataset Thumbnail:

 

Dataset Specification:

Product Name

Land Cover Map 2007 (LCM2007)

Data Provider

Centre for Ecology & Hydrology (CEH)

Scale

Minimum mappable unit of 0.5ha, 25m or 1km pixel resolution

Coverage

United Kingdom (complete)

Data Structure

  • Vector (polygons)
  • Raster

Format(s)

  • Vector: Esri Shapefile, Esri File GeoDatabase, MapInfo TAB, MID/MIF, Autodesk DWG, DXF, OGC KML, OGC GML, CSV (attribute data only)
  • Raster: GeoTIFF

Uses

Licencing

CEH Licence

Update Frequency

Not updated

 

Dataset Resources:

LCM2007 Product site
LCM2007 Vector attributes and metadata
LCM2007 Raster 25m metadata
LCM2007 Raster 1km metadata
LCM2007 Classification Guide
LCM2007 Sample Data (zip)
LCM2007 Final Report (pdf)
LCM2007 Dataset Documentation (pdf)