Harmonization of Soil Information in the Alps Technical and Operational Procedures Swiss-Italian ECALP Pilot Area Stefano Brenna, Alberto Rocca ERSAF – Agency for Agriculture and Forests - Lombardy Ispra, 3-4 February 2005 Swiss-Italian ECALP pilot area Lombardy - “state of art” topics • cartographic issues • exchange format • first results • workplan Cartographic issues - Swiss-Italian Pilot Area ECALP GIS Layer: administrative boundaries and lakes Coordinate system: ETRS-LAEA Switzerland Italy, Lombardy geography surface distribution Unit Km [Xmin,Ymin] [4236, 2522] pixel Range X [4236-4256] area (km2) Range Y [2522-2542] area (%) Italy Switzerland border total 218 127 55 400 243.30 156.70 400 60.8 39,2 100 Projection to Lambert coordinate system ERSAF GIS Layers: soil and land use maps (scale 1:250.000) coordinate system: origin: Gauss-Boaga West destination: ETRS_LAEA DATUM transformation ED_1950 to WGS_1984_1 surface distribution pixel area (km2) area (%) Result of spatial overlay of ERSAF GIS layer with ECALP GIS layer: Italy Switzerland border total 200 (218) 125 (127) 75 (55) 400 237.51 162.49 400 area pro Italy 59.4 40.6 100 area not present in ECALP data area pro Switzerland Geometric incongruity of the maps at the Swiss-Italian border Possible situations for “shared” pixels 1 over information 2 lack of information 3 both over and lack of information 4 no information (in theory) Grid transformation in Gauss-Boaga West coordinate system ECALP GIS layer: alpine 1k grid coordinate system: origin: ETRS_LAEA destination: Gauss-Boaga West - grid is not perfectly squared - grid cells sides are segmented - grid cells area: 0,9992 km2 comparing the percentage of cell occupied by SMU in Lambert and Gauss-Boaga West coordinate system: • difference between the two cases fits a Gaussian distribution: mean value 0,08 km2 and standard deviation 6,4 km2; • no perfect equivalence: error is often relevant (up to 16 %) Exchange format ver. 6.2 comments and remarks AGRI-USE Which uses are considered agricultural uses? AGLM1.AGLM2 Other limitations, often more relevant for agriculture, can occur, such as slope gradient, slope shape, climate, … AGLM could be identify as “pedological limitation to agricultural use”. TEXT-TOP-SEC In the Lombardy soil database: • only modal attributes of STU are usually formalised: secondary information is not available. • texture classes proposed are rather wide: soils having so different textures belong to different STU. Exchange format ver. 6.2 WM1, WM2 Information not available because it is not an attribute of STU (information more related to “land” than to “soil”) PX-OBS PX-NPROF profiles other field observations Information accuracy in the pixel depends on the scale of the soil survey carried out in the area and not on the number of soil observations. First results Source of data: land use map (DUSAF) SUR-BARE, SUR-URB, W-Body, STU-TOT soil map (scale 1:250.000) other parameters Swiss-Italian Pilot area Soil Regions Switzerland (total/dominant) Prealps Lombardy (total/dominant) (Po Plain and) Morainic hills Lakes First results Land Use WRB Soil Reference Groups lakes CM - Cambisols seeding LP - Leptosols pasture-land LU - Luvisols forest (conifers, broadleaf) PH - Phaeozems urban UM – Umbrisols Lakes Support tools • provided: method to identify the dominant STU occurring in the pixels by means of Microsoft Access database query • under construction: web utility to get the possibility to see “grid maps” and data stored in the pixel method to identify the dominant STU pixel ID SMU ID area SMU ID STU ID STU/SMU 4236_2522 113 0,766 113 33 89 % 4236_2522 91 0,118 113 34 11 % 4236_2522 121 0,116 91 189 48 % 91 130 29 % 91 13 23 % 121 36 100 % pixel ID SMU ID SMU area STU ID % STU/SMU STU area 4236_2522 113 0.766 33 89 % 0.682 4236_2522 113 0.766 34 11 % 0.084 4236_2522 91 0.118 189 48 % 0.057 4236_2522 91 0,118 130 29 % 0.034 4236_2522 91 0,118 13 23 % 0.027 4236_2522 121 0,116 36 100 % 0.116 dominant STU Work plan Next steps – ECALP Pilot Area • Integrating Swiss experience and contribution • Assessing geometric incongruity at the border • Identifying rules for shared pixels • Filling the database • Field excursion: 17-18th of February (to be confirmed) For the future: • INTERREG project (?) Thanks for your attention!