The following protected areas data are used in the analysis:

Priority Habitats – good quality semi-improved grassland

The priority habitats are described here.

These codes are coordinated across England and Wales. They are used as the DN value when rasterising the data. England and Wales have been rasterised and merged into priority_habitats_england_and_wales.tif

Wales does not distinguish between ‘Lowland Fens’ and ‘Reedbeds’ and has them in the same category (10), whereas England distinguishes between the two ‘Lowland Fens’ (10) and ‘Reedbeds’ (37).

Habitat codes for England
Habitat codes for Wales
Category Hectares Legend
0 41237427.500000
1 275836 Blanket Bog
2 273 Blanket Bog or Lowland Raised Bog
3 648 Calaminarian Grasslands
4 28789.750000 Coastal saltmarsh
5 16328.250000 Coastal Sand Dunes
6 65 Inland Rock Outcrop and Scree Habitats
7 1729.750000 Inland Rock Outcrop and scree Habitats
8 1282.750000 Limestone pavement
9 63886 Lowland Calcareous Grassland
10 27299.500000 Lowland Fens and Reedbeds
11 71757.750000 Lowland Heathland
12 23486.750000 Lowland Meadows
13 9816.750000 Lowland Raised Bog
14 15669.250000 Maritime Cliff and Slopes
15 1601.500000 May support Lowland Meadows
16 2368 Mosaic of BAP habitats
17 510.250000 Part Coastal Vegetated Shingle
18 2647.250000 Part Open Mosaic Habitats of Previously Developed
19 39052.750000 Purple Moor Grass and Rush Pastures
20 16076.750000 Traditional orchards
21 10022.250000 Upland Calcareous Grassland
22 23744.250000 Upland Flushes, Fens and Swamps
23 305922.500000 Upland Heathland
24 148.500000 Wet Woodland
25 489.250000 Wet Woodland (scrub component)
27 219432 Coastal and floodplain grazing marsh
28 3782.750000 Coastal vegetated shingle
29 736405.750000 Diciduous woodland
30 8907.750000 Fragmented heath
31 74154.750000 Good quality semi-improved grassland
32 146674.250000 Grass moorland
33 48812.500000 Lowland dry acid grassland
34 1406 Mountain heaths and willow scrub
35 3010.250000 Mudflats
36 133847.500000 No main habitat but additional habitats present
37 3185.500000 Reedbeds
38 968.250000 Saline lagoons
39 2533.500000 Upland hay meadow

Attribution:  © Natural England copyright. Contains Ordnance Survey data © Crown copyright and database right [year].

Special Protected Areas

SPAs are designated under the Wildlife & Countryside Act 1981 and Conservation Regulations 2010 to protect rare and vulnerable birds

Special Areas of Conservation

SACs are designated under the Conservation of Habitats and Species Regulations 2017 (see also the RSPB IBAs)

[Important Bird & Biodiversity Areas]


Ramsar Sites

Ramsar Sites are designated under the Ramsar Convention for the protection of internationally important wetlands.

Sites of Special Scientific Interest

Biological SSSIs are areas of special interest “by reason of any of its flora, fauna, or geological or physiographic features”.

Persistent Non-vegetation / Urban Areas

Built up areas are obviously excluded from opportunity woodland. There are two sources of information for this exclusion zone:

  • Persistent non-vegetated areas from the CROME analysis
  • Ordnance Survey Buildings

Persistent Water

National Nature Reserves

Local Nature Reserves

Moor Line


Green Belt

Represented as a binary mask.

National Parks

1The Broads
4Lake District
5New Forest
7North York Moors
8Peak District
9Yorkshire Dales
10South Downs
22Pembrokeshire Coast
23Brecon Beacons

Areas of Outstanding Natural Beauty