stratification process using sigpac plot … · ´direct investigation over the plots

PROCESO DE ESTRATIFICACION DEL TERRITORIO UTILIZANDO COMO INFORMACION DE BASE EL PARCELARIO SIGPAC

MINISTERIO DE AGRICULTURA, PESCA Y ALIMENTACIONSECRETARIA GENERAL TECNICA

Subdirección General de Estadísticas Agroalimentarias

STRATIFICATION PROCESS USING SIGPAC PLOT LAYOUT

Mars annual meeting Madrid Nov 2007

Mars Meeting November 2007 Madrid

SECRETARIA GENERAL TECNICASubdirección General de Estadísticas Agroalimentarias

Crop area determinationOther land cover area determination

Grass landShrub landForest landOther interesting agriculture related areas

Crop yield estimationFruit trees orchards characterizationIrrigated and Greenhouse areas determinationCrop methodsConsistent results at regional level



Field work May/JuneAdditional visits for crop yield estimation, second crop detection, fruit tree and fresh vegetables additional investigation...

Direct investigation over the plotsMore than 10.000 sample units (49 ha each) investigated

No need to ask farmersGeo referred data obtainedAgriculture Ministry direct contract and Regional Agriculture Statics Authorities collaboration



700

m



Pilot survey 1990

Area(000 ha)

1990 CASTILLA Y LEÓN 9.401 9.401 18,62MADRID 803CASTILLA LA MANCHA 7.923

1992 ANDALUCIA 8.736 26.863 53,21ARAGÓN 4.767EXTREMADURA 4.160LA RIOJA 504C.VALENCIANA 2.326R.MURCIA 1.132GALICIA 2.948NAVARRA 1.039

1996 BALEARES 494 44.233 87,611997 CATALUÑA 3.195 47.428 93,941998 CANARIAS 748 48.176 95,42

P.DE ASTURIAS 1056CANTABRIA 532

2000 PAIS VASCO 725 50.489 100,00

42.700 84,57

49.764 98,57

1991

1993

1994

1999

1995

18.127 35,90

35.790 70,89

39.752 78,74

YearRegion Area (acumulative)

Nombre 000 ha% National

Area



Area frame surveyPolygonal units1 x 1 km gridWhole territory stratifiedBasic field work unit 700x700 m square unitSystematic sample (conglomerate technique)General sample 3%Reinforced areas up to 15%



Reduce sample needsObtain more accurate resultsEnhance possibilities for specific investigations (multi proposal design)

Fruit treesIrrigation areasFresh vegetables productionsGreenhouses



Stratification unit: 10 x 10 km square, named blockStratification basis: survey dataStrata strategy: Strata designed upon crop productions value.Weakness:

Stratification units too bigLow resolution on base information



Stratification unit= Basic unit 1x1 km squareStratification base: Corine Land Cover 1990 and National Irrigation Plan (1997)Strata strategy: Crop index

Permanent irrigated crops 6Non permanent irrigated crops 4Permanent not irrigated crops 2Non permanent not irrigated crops 1Grassland 0,7



Stratification unit= Basic unit 1x1 km squareStratification base: SIGPAC and Corine land Cover 2000Strata strategy: Crop Index

Permanent irrigated crops 8Non permanent irrigated crops 6Non permanent not irrigated crops 2Permanent not irrigated crops 1Vineyard 1Olive trees 1



Plot layoutPlot classificationIrrigation %

Weakness: Irrigation information not available for all regions

Solution adopted Use of Corine Land Cover for irrigation information

Vineyard and olive tree register relation



Not all regions have irrigation information in SIGPAC databaseIrrigation is very important for territory classification in SpainCorine Land Cover has been overlaid with SIGPAC in order to identify irrigated areas

Codes 212, 213, 2222, 2212, 2232



In Valencia region Citric Fruit Tree Register database has been used to increase classification accuracy for Citric Fruit Tree OrchardsCitric Fruit Tree plots have been overlaid with Sigpac plots and the area classified accordantly.



StrategyNo crop (N)Vineyards+Olive Trees+Almonds (P)Cropland not irrigated (E)Irrigated agricultural land (I)



Code Description Recode Recode DescAG Inland Water NA No agricultureAR Rice HR Irrigated croplandCA Roads, paths and tracks NA No agricultureCI Citric fruit trees FR Permanent crop irrigatedCO Olive trees (surrounding) FS Permanent crop not irrigatedED Built areas NA No agricultureFO Forest areas FM ForestFY Fruit trees FR Irrigated fruit treesIM Not productive NA No agricultureIV Greenhouses HR Irrigated croplandOF Olive trees+Fruit Trees FS Permanent crop not irrigatedOV Olive trees FS Permanent crop not irrigatedPA Grassland sparse tree PS GrasslandPR Grassland + Sparse shurb PS GrasslandPS Grassland PS GrasslandTA Cropland HS Not irrigated croplandTH Kitchengarden HR Irrigated croplandVF Vineyard+fruit tree FS Permanent crop not irrigatedVI Vineyard FS Permanent crop not irrigatedVO Vineyard+ Olive Tree FS Permanent crop not irrigatedZC Excluded NA No agricultureZU Urban NA No agriculture



Class Index A Index BIrrigated Fruit Trees 8 8Irrigated cropland 6 6Not irrigated cropland 1 2Not irrigated fruit trees 2 1No crop 0 0Vineyards 2 1Olive trees 2 1



4 grids, one per utm zoneCell centre criteria for cell geographic attributionCell subdivision 500 and 700 m



+ Canary



c5 c6

c7c1 c2

c3 c4

1.00

0 m

700 m

500

m

Cell Components1 x 1 km

c1+c2+c3+c4+c5+c6+c7

700 x 700 m c1+c2+c3+c4+c5500 x 500 m (a) c1500 x 500 m (b) c2+c7500 x 500 m (c) c3+c5500 x 500 m (d) c4+c6



Class %Irrigated Fruit Trees 30,2811Irrigated cropland 3,2381Not irrigated cropland 0,9032Not irrigated fruit trees 3,4458No crop 62,1321

SIGPAC

CORINE



Class % Index Crop IndexIrrigated Fruit Trees 30,2811 8 242,2488Irrigated cropland 3,2381 6 19,4285Not irrigated cropland 0,9032 2 1,8064Not irrigated fruit trees 3,4458 1 3,4458No crop 62,1321 0 0,0000TOTAL 100,0000 266,9295

Strategy (A)



StrategyNo crop (N)Vineyards+Olive Trees+Almonds (P)Cropland not irrigated (E)Irrigated agricultural land (I)



CELL CROP INDEX %CI %NICL %ICL %IFT %NIFT %VI %OT-------------- -------------- -------------- -------------- -------------- -------------- -------------- -------------- --------------6744213 207,39751 64,96 9,25 91,75 92,67 10,45 13,82 19,556384157 207,364714 64,97 9,26 91,78 92,67 10,45 13,82 19,556364210 207,202929 64,98 9,26 91,81 92,67 10,47 13,82 19,555784228 206,876418 65 9,29 91,84 92,67 10,47 13,82 19,55STRATA CHANGE6104147 206,701857 65,01 9,3 91,84 92,7 10,47 13,82 19,566604283 206,630449 65,02 9,33 91,86 92,7 10,48 13,82 19,575834216 206,460184 65,04 9,36 91,89 92,7 10,49 13,82 19,576634229 206,31649 65,05 9,37 91,89 92,72 10,51 13,82 19,59-------------- -------------- -------------- -------------- -------------- -------------- -------------- -------------- --------------6274204 92,706214 88,37 69,24 98,68 98,67 55,63 86,93 72,156144229 92,684622 88,37 69,25 98,68 98,67 55,66 86,93 72,166484261 92,678827 88,38 69,27 98,68 98,67 55,67 86,94 72,25884205 92,675367 88,38 69,3 98,68 98,67 55,68 86,94 72,2STRATA CHANGE5944210 92,604939 88,39 69,32 98,68 98,67 55,71 86,95 72,225684226 92,55148 88,4 69,35 98,68 98,67 55,71 86,95 72,226034221 92,518929 88,4 69,36 98,68 98,67 55,75 86,95 72,22-------------- -------------- -------------- -------------- -------------- -------------- -------------- -------------- --------------6404196 0,000633 100 100 100 100 100 100 1006994164 0,000092 100 100 100 100 100 100 1006484250 0,000041 100 100 100 100 100 100 100STRATA CHANGE5594213 0 100 100 100 100 100 100 1005604212 0 100 100 100 100 100 100 100-------------- -------------- -------------- -------------- -------------- -------------- -------------- -------------- --------------



I E P N Total2.305 2.753 4.904 1.481 11.443

Population

Conglomerate I E P N Total26 18 27 56 17 11832 24 27 45 17 11367 22 23 55 14 11419 22 2274 22 2293 30 3001 27 2788 29 2951 23 2345 23 2395 19 1930 21 21Total 280 77 156 48 561

Sample



Coeficientes de extrapolación

Strata I E P N 6% 9%32,83 32,28 31,40 34,76 16,74 11,27

Extrapolación 49ha (9%) por CCAASTRATAI E P N

Code Extrapolada Sigpac Extrapolada Sigpac Extrapolada Sigpac Extrapolada SigpacMar 177 539 1.153 2.172 28.304 24.621 29.458 27.509Arroz 18.836 18.348 392 378 35 112 55 19.263 18.893Citricos 97 83 18 14 115 98Contorno olivar 200 182 1.171 1.153 783 1.068 3 2.153 2.406Corrientes y Superfi 5.567 7.285 12.228 7.434 17.024 14.824 8.831 9.753 43.650 39.296Edificaciones 71 93 119 127 88 114 1 11 280 345Forestal 10.019 11.268 78.091 92.052 532.386 519.644 460.125 455.882 1.080.621 1.078.846Frutales regad¡o 45.854 45.332 2.475 3.213 114 719 33 48.443 49.297Frutales secano 6.338 8.991 61.879 53.838 38.105 43.344 346 106.322 106.519Huerta 5.542 4.162 2.383 2.444 1.350 1.605 93 9.275 8.304Improductivos 10.152 11.227 13.038 15.320 13.054 15.352 3.052 4.175 39.296 46.074Invern. y Cultivos b 844 575 122 303 88 215 11 1.055 1.104Olivar 7.757 7.567 74.622 67.397 37.357 44.115 194 119.737 119.273Olivar-Frutal 102 75 969 757 424 392 1.495 1.224Pastizal 2.185 2.336 7.211 5.496 21.785 21.028 7.321 9.200 38.502 38.059Pasto arbustivo 21.184 20.600 86.667 90.248 315.022 302.873 277.548 281.632 700.421 695.353Pasto con arbolado 1.588 2.235 20.888 20.141 100.325 90.664 57.859 52.643 180.660 165.682Sin base 972 513 761 2.738 3.252 16.622 18.761 20.332 23.288Tierras arables rega 110.992 107.239 5.844 7.618 907 2.515 180 117.743 117.551Tierras arables seca 67.880 69.589 236.454 229.699 85.246 101.153 2.016 389.580 402.458Viales 9.334 9.149 16.647 16.534 20.383 21.239 4.690 5.519 51.054 52.441Viñedo 1.825 1.845 32.426 35.817 17.491 17.883 79 51.742 55.624Viñedo-Frutal 8 52 84 308 123 0 360 216Viñedo-Olivar 0 11 36 13 36 24Zona concentr. no in 212 724 2.611 454 0 4.001Zona urbana 10.821 9.070 20.850 22.458 68.562 67.748 42.872 41.570 143.104 140.846Total general 338.158 338.163 674.548 674.562 1.274.766 1.274.777 907.226 907.228 3.194.697 3.194.730

Area (ha) Total extrapolada

(ha)

Superficie SIGPAC

(ha)



Strata FR FS LR LS NN OL VI Total generalN 0,24% 0,00% 0,05% 0,71% 42,37% 0,07% 0,00% 24,91%P 11,53% 30,27% 7,31% 27,84% 44,48% 7,92% 6,54% 33,09%E 25,52% 66,65% 20,28% 64,46% 10,40% 88,65% 85,06% 35,01%I 62,71% 3,08% 72,35% 6,99% 2,75% 3,36% 8,40% 7,00%Total general 100,00% 100,00% 100,00% 100,00% 100,00% 100,00% 100,00% 100,00%

Andalucía


Castilla y León


C. Valenciana



Crop/Land Cover No irrigated Irrigated Greenhouses TotalCereals 5.519.984 852.115 6.372.098Legumes 231.142 12.305 45 243.492Tubers for Human Compsuption 14.441 49.193 63.634Industry crops 624.881 183.057 807.938Fodder crops 650.025 280.876 930.901Fresh vegetables 21.656 199.075 27.576 248.307Fallow land 3.557.370 106.255 3.663.625Citric Fruit Trees 18.717 314.079 332.796Not citric fruit trees 770.819 254.737 3.974 1.029.530Vineyard 806.704 351.039 110 1.157.853Olive trees 1.900.123 613.296 2.513.419Other permanent crops 49.487 3.049 52.536Nurserys 3.284 12.347 1.020 16.651Empty greenhouses 33.130 33.130Kitchengardens 45.972 63.261 242 109.476Grassland 7.530.561 37.956 7.568.517Shurbland 7.612.371 7.612.371Forest 18.792.753 38.510 18.831.264Other 6.560.393 6.560.393Spain 47.098.311 3.371.151 66.097 50.535.560



Year 2006 60.798 ha Cotton

Year Area(ha) Year Area(ha) Year Area(ha)

2005 82.379 2004 84.445 2003 94.127DESTINATION IN 2006 DESTINATION IN 2005 DESTINATION IN 2004

% CROPS % CROPS % CROPS19 Cotton 25 Cotton 24,3 Cotton16 Sunflower 20 Durum Wheat 24,2 Maize

13,9 Common Wheat 14,7 Maize 11,6 Durum Wheat13,5 Durum Wheat 11,6 Sugar Beet 11,2 Sugar Beet10,9 Sugar Beet 9 Sunflower 8,9 Sunflower9,6 Maize 4,5 Fallow Land 3,8 Fallow Land7,6 Fallow Land 3 Common Wheat 3,4 Common Wheat3 Potatoe 3 Potatoe 3,1 Potatoe1 Citric Fruit trees 1 Citric Fruit Trees 0,4 Citric Fruit



Soil management haTraditional tillage 1.106.441

Minimun tillage 2.011.113

Natural vegetal cover 751.208

Sown vegetal cover 30.932

Inert cover 50.589

Without maintenance 291.216

Zero tillage 347.449

Unkown 450.492

TOTAL 5.039.440

Permanent crops



Additional information can be found at:

http://www.mapa.es/es/estadistica/pags/encuestacultivos/resultados.htm

stratification process using sigpac plot … · ´direct investigation over the plots

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