Land Cover Map 2007: technical information

Table 1: Description of the attributes of the LCM2007 vector dataset

AttributeDescription
Parcel_IDUnique parcel identifier for each parcel, which includes the image the polygon was derived from. Follows the format: 11853977:c20 where 11853977 is the parcel id and c20 means the polygon came from composite image c20. Image numbers may also begin with an i, eg i76, which signifies a single-date image. All images are documented in appendix 2.
BHDominant land cover at Broad Habitat level eg Coniferous Woodland
BHSubBroad Habitat sub-class
FieldCodeShort text string giving field codes. Note field codes are used in the creation of LCM2007, but the accuracy of the product at this level is not assessed. The LCM2007 team recommends that these codes are not used eg Wl (water lake). The codes are included primarily to give users the opportunity to apply bespoke KBEs.
KBE

Knowledge-based Enhancement (KBE). Descriptor detailing the processing history of each segment including the complete list of KBEs applied and the change instigated by the KBE. The KBE notation follows a standard format of two or three letters followed by a comma followed by original class and then the new class. For example,

  • SL, Gr->Bg signifies soil correction (SL) changing Rough Grassland to Bog. This would occur when the polygon was on a bog soil, with no, or only slight slope.
  • ALT, Sd->Gr signifies an altitude based correction (ALT) changing sand dune to rough grassland. The change to rough grassland would be based on the next spectral class in the probability listing, as long as it was not a coastal class.

KBE identifiers:

MC - manual correction

SL - soil correction

CM - coastal mask

OM - offshore mask

UR - urban mask

ALT - altitude correction

ProbList

The probability of the polygon belonging to a spectral variant class. The attribute lists the five spectral classes that closest match the spectral signature of the polygon

eg Gr_d,0.87:Gr_u,0.09:Hga_d,0.04:Gi_n,0.00:Gi_e,0.00

CorePixelsTotal number of pixels within the core area of the segment used to perform the maximum likelihood classification.
Construct

History of the construction of the polygon.

  • OSMM - OS Master Map polygon
  • OSMM:SEG - OS Master Map polygon as basis with segmentation
  • OSMM:AGC:SEG - OS Master Map polygon with agricultural payment boundary vectors and segmentation
TotPixelsTotal number of pixels in polygon

Table 2: Habitats, LCM2007 classes and Broad Habitat sub-classes for LCM2007

LCM2007 classLCM2007 class numberBroad Habitat sub-classBroad Habitat sub-class code
Broadleaved woodland1DeciduousD
Recent (<10yrs)Dn
MixedM
ScrubSc
Coniferous woodland2ConiferC
LarchCl
Recent (<10yrs)Cn
EvergreenE
FelledFd
Arable and Horticulture3Arable bareAba
Arable unknownAun
Unknown non-cerealAun
OrchardO
Arable barleyAba
Arable wheatAw
Arable stubbleAst
Improved Grassland4Improved grasslandGi
LeyGl
HayGh
Rough Grassland5Rough / unmanaged grasslandGr
Neutral Grassland6NeutralGn
Calcareous Grassland7CalcareousGc
Acid Grassland8AcidGa
BrackenBr
Fen, Marsh and Swamp9Fen / swampF
Heather10Heather & dwarf shrubH
Burnt heatherHb
GorseHg
Dry heathHd
Heather grassland11Heather grassHga
Bog12BogBo
Blanket bogBb
Bog (Grass dom.)Bg
Bog (Heather dom.)Bh
Montane habitats13Montane habitatsZ
Inland Rock14Inland rocklb
Despoiled landUd
Salt water15Water seaWs
Water estuaryWe
Freshwater16Water floodedWf
Water lakeWl
Water riverWr
Supra-littoral Rock17Supra littoral rocksSr
Supra-littoral Sediment18Sand duneSd
Sand dune with shrubsSds
ShingleSh
Shingle vegetatedShv
Littoral Rock19Littoral rockLr
Littoral rock / algaeLra
Littoral Sediment20Littoral mudLm
Littoral mud / algaeLma
Littoral sandLs
Saltmarsh21SaltmarshSm
Saltmarsh grazingSmg
Urban22BareBa
UrbanU
Urban industrialUi
Suburban23Urban suburbanUs

Table 3: Metadata information for the LCM2007 25m raster dataset

 Great BritainNorthern Ireland
Columns / width (pixels)280007800
Rows / height (pixels)520006200
Lower left easting (m)0*180000*
Lower left northing (m)0*280000*
Pixel size (m)2525
Data typeUnsigned 8-bitUnsigned 8-bit
Coordinate systemBritish National GridIrish National Grid
ProjectionTransverse MercatorTransverse Mercator
SpheroidAiryAiry Modified 1849
DatumOSGB 1936Ireland 1965

Table 4: Metadata information for the LCM2007 1km raster dataset

 Great BritainNorthern Ireland
Columns / width (pixels)700200
Rows / height (pixels)1300220
Lower left easting (m)0*180000
Lower left northing (m)0*280000
Pixel size (m)10001000
Coordinate systemBritish National GridIrish National Grid
ProjectionTransverse MercatorTransverse Mercator
SpheroidAiryAiry Modified 1849
DatumOSGB 1936Ireland 1965

 

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