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Level 1	Level 2	Level 3	CLC_Code
1. Artificial surfaces	1.1. Urban fabric	1.1.1. Continuous urban fabric	111
1.1.2. Discontinuous urban fabric			112
1.2. Industrial, commercial and transport units		1.2.1. Industrial or commercial units	121
1.2.2. Road and rail networks and associated land			122
1.2.3. Port areas			123
1.2.4. Airports			124
1.3. Mine, dump and construction sites		1.3.1. Mineral extraction sites	131
1.3.2. Dump sites			132
1.3.3. Construction sites			133
1.4. Artificial non-agricultural vegetated areas		1.4.1. Green urban areas	141
1.4.2. Sport and leisure facilities			142
2. Agricultural areas	2.1.Arable land	2.1.1. Non-irrigated arable land	211
2.1.2. Permanently irrigated land			212
2.1.3. Rice fields			213
2.2. Permanent crops		2.2.1. Vineyards	221
2.2.2. Fruit trees and berry plantations			222
2.2.3. Olive groves			223
2.3. Pastures		2.3.1. Pastures	231
2.4. Heterogeneous agricultural areas		2.4.1. Annual crops associated with permanent crops	241
2.4.2. Complex cultivation			242
2.4.3. Land principally occupied by agriculture, with significant areas of natural vegetation			243
2.4.4. Agro-forestry areas			244
3. Forests and semi-natural areas	3.1. Forests	3.1.1. Broad-leaved forest	311
3.1.2. Coniferous forest			312
3.1.3. Mixed forest			313
3.2. Shrub and/or herbaceous		3.2.1. Natural grassland vegetation association	321
3.2.2. Moors and heathland			322
3.2.3. Sclerophyllous vegetation			323
3.2.4. Transitional woodland shrub			324
3.3. Open spaces with littleor no vegetation		3.3.1. Beaches, dunes, and sand plains	331
3.3.2. Bare rock			332
3.3.3. Sparsely vegetated areas			333
3.3.4. Burnt areas			334
3.3.5. Glaciers and perpetual snow			335
4. Wetlands	4.1. Inland wetlands	4.1.1. Inland marshes	411
4.1.2.Peatbogs			412
4.2. Coastal wetlands		4.2.1. Salt marshes	421
4.2.2. Salines			422
4.2.3. Intertidal flats			423
5. Water bodies	5.1 Inland waters	5.1.1 Water courses	511
5.1.2 Water bodies			512
5.2 Marine waters		5.2.1 Coastal lagoons	521
5.2.2 Estuaries			522
5.2.3 Sea and ocean			523

So if we want to use

• the first level we'll select the first character from the CLC_CODE
  
• the second level : the first and the second character
  

Regroupement des codes pour le traitement :
11 classes

Name	Levels in CLC
Artificial surfaces	1.1 Urban fabric
1.2 Industrial, commercial and transport units
1.3 Mine, dump and construction sites
Artificial vegetated	1.4 Artificial non-agriculutural vegetated areas
Arable land	2.1 Arable land
Permanent crops	2.2 Permanent crops
Pastures	2.3 Pastures
Heterogeneous agricultural 2.4 Heterogeneous agricultural areas
Forest	3.1 Forests
Natural	3.2 Shrub and/or herbaceous
3.3 Open spaces with littleor no vegetation
Wetlands	4.1 Inland wetlands
4.2 Coastal wetlands
Inland waterbodies	5.1 Inland waters
Marine water	5.2 Marine waters