From land use to land cover: evapotraspiration assessment in a metropolitan region, di Paolo La Greca, Daniele La Rosa, Francesco Martinico, Riccardo Privitera
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From land use to land cover: evapotraspiration assessment in a metropolitan region, di Paolo La Greca, Daniele La Rosa, Francesco Martinico, Riccardo Privitera

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Sesta Conferenza Nazionale in Informatica e Pianificazione Urbana e Territoriale

Sesta Conferenza Nazionale in Informatica e Pianificazione Urbana e Territoriale

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From land use to land cover: evapotraspiration assessment in a metropolitan region, di Paolo La Greca, Daniele La Rosa, Francesco Martinico, Riccardo Privitera From land use to land cover: evapotraspiration assessment in a metropolitan region, di Paolo La Greca, Daniele La Rosa, Francesco Martinico, Riccardo Privitera Presentation Transcript

  • Daniele La Rosa [email_address] From land use to land cover: evapotranspiration assessment in a metropolitan region Università di Catania Dipartimento di Architettura e Urbanistica LA boratorio per la P rogettazione del T erritorio e dell’ A mbiente www.lapta.dau.unict.it Sesta Conferenza Nazionale in Informatica e Pianificazione Urbana e Territoriale – INPUT 2010 Potenza 13 - 15 Settembre 2010
  • Summary
    • Non Urbanised Areas (NUA) for urban planning (climate changes minimisation strategies)
    • Study area
      • Catania Metropolitan area
      • Municipality of Mascalucia
    • Land cover analysis of NUA (method and results)
    • Uses of Land Cover for land use suitability model
  • Non Urbanised Areas for climate changes minimisation strategies Role of Non Urbanised Areas as fundamental issue to achieving high levels of urban quality together with adaptation to climate changes Climate changes as new challenge to urban and regional planning Loss of evapotranspiring surfaces and vegetated soils is one of the main consequences of urban sprawl processes.
  • Land cover analysis for Non Urbanised Areas (1) Land cover analysis for evapotranspiration How much evapotranspiring and permeable are the different land use types? Each patch of land uses characterized by different land cover types buildings impervious grass cultivated trees shrubs herbaceous vegetation bare soil
  • B = Buildings G = Grass T = Trees I = Impervious BS = Bare soil C = Cultivated HV = Herbaceous vegetation S = Shrubs Example of land cover types extraction Land cover analysis for Non Urbanised Areas (2)
  • The study area (1) Catania Metropolitan Area 27 Municipalities Area: ~ 950 Km 2 Pop: 581413
  • The study area (2) Metropolitan area population dynamics (1961 – 2008)
    • Grows more than 27%
    • Main city (Catania) looses 16%, other 26 municipalities increase of 107%
    • In 2008, about 60% of total population live outside the main city
    ~ 1600% growth in 80 years Metropolitan area urban growth (1936 – 2008) * Catania Metropolitan Area * Catania not included
  • The study area (3) Mascalucia Municipality
    • Population almost doubled twice since 1936 ( 27482 inhabitants)
    • Three land use master plans from 1960s
    • Agriculture oriented economy, mainly based on wine production, completely swiped out, first, by holiday houses developments in the 1960 -1970s. In the following 20 years these houses became stable dwellings .
    One of the small agricultural towns on the volcano slopes absorbed into the expanding metropolis Expanding metropolis
  • The study area (4) Land Use Residential Areas Farmlands Abandoned Farmlands Woods and Shrubs
    • Sources:
    • vector cartography (1:10,000) regional authorities
    • municipal vector cartography (1:2000)
    • recent high resolution ortophotos (2007-2008)
    • Field surveys (for most recent changes)
  • The study area (5) Mascalucia Municipality
    • Residential land covers almost half of the municipality
    • Farmland (cultivated and abandoned) more than 21%
    • wood and shrubs (20,5 %).
    • Roads surfaces also sum up almost 10 % of the total .
    • Relevant amount of small patches of farmland, eroded by urban sprawl.
    • Farmland, shrubs and wooden patches, represent the Non Urbanized Areas scattered within the municipality.
    Land Use LAND COVER Land use type Area [ha] % Abandoned farmland 215,1 13,2% Farmland 135,7 8,3% Woods and shrubs 333,4 20,5% Parks and public gardens 24,5 1,5% Trading 8,7 0,5% Manufacturing 1,8 0,1% Services and utilities 38,0 2,3% Residential 704,4 43,2% Private gardens 13,5 0,8% Parkings 3,4 0,2% Roads 150,9 9,3% Total 1629,5 100%
  • The study area (6) Mascalucia Municipality
    • Urban land increased by more than 2000 % between 1928 and 2008 (from 35,7ha to 718,4 ha )
    Urban growth Built up area Area Area Ha % 1928 357481 35,7 4,74% 1964 476947 47,7 6,32% 1985 4543156 454,3 60,24% 2000 1737788 173,3 23,04% 2008 425903 42,1 5,65% TOT 7115372 753 100,00%
  • From Land Use to Land Cover Land use categories not able to provide indications about land cover features. Each patch of a single land use type composed by a (complex) mix of land covers Characterizing land uses type by different land covers becomes crucial for environmental planning (i.e. climate change adaptation strategies) Different percentages of evapotranspiring surfaces can be taken into account in deciding prospective land uses or safeguard measures . Why a Land Cover assessment of NUA? Land Cover Analysis (1)
  • Land Cover Analysis (2) Land Cover Types
  • A geographic sampling strategy
    • Overlay of 30 meters square grid over each land use type
    Need of a geographic sampling to assess land cover (mapping small land cover features is a time consuming task) Detached houses Woods and shrubs Land Cover Analysis (3)
  • A geographic sampling strategy 2. Random choose of cells for each grid
    • Each land use type sampled with different size samples with Cochran Formulas (Cochran, 1977 )
    • Confidence level and interval fixed at 85% and 5%
    Land Cover Analysis (4)
    • Sample cells randomly generated with the Random Selection ArcMap tool
  • A geographic sampling strategy 3. Aerial photo interpretation of the land cover types Inside every sampled cell, land cover surfaces manually digitalized by photo interpretation B=buildings I=impervious G=grass C=cultivated T=trees S=shrubs HV=herbaceous vegetation BS=bare soil Land Cover Analysis (5)
  • Results Composition of land cover surfaces for each land use type * * Residential land use type further divided in: historical compact urban settlements, multi-storey apartment residences, linear historical rural settlements and detached family houses.
    • Residential land use types show some of the highest proportion of trees cover surface.
    • Shrubs are higher in Abandoned Farmland (36%) than in Woods and Shrubs (33%). Woods and Shrubs land use type are more characterized by shrubs vegetation than by trees.
    Land Cover Analysis (6)
  • Results Diversifying land use types by the percentage of their evapotranspiring and impervious surfaces
    • evapotranspiring land cover types = Trees, Shrubs, Cultivated, Grass, Herbaceous Vegetation
    • impervious land cover types = Buildings and Impervious
    Land Cover Analysis (7) LAND USE TYPES % evapotranspiring surface % impervious surface Detached houses 62,1% 33,7% Historical urban areas 32,3% 67,1% Multi-storey apartment residences 27,6% 72,4% Linear historical rural settlements 49,4% 50,6% Private gardens 79,0% 19,0% Trading 12,2% 73,4% Manufacturing 8,3% 81,5% Services and utilities 35,9% 50,5% Farmland 83,1% 6,6% Abandoned farmland 77,8% 2,9% Urban greenspaces 92,2% 7,7% Woods and shrubs 72,1% 8,7%
  • Results Extraction of Non Urbanised Areas and their classification into 4 classes (equal interval) Land Cover Analysis (8)
  • Leisure Suitability Land Use Suitability Model of NUA Which land use strategies for the broken grid of NUA? Which strategies for climate change adaptation? Environmental protection New forms of agricultures Uses of Land Cover Analysis (1)
  • Uses of Land Cover Analysis (2) ENVIROMENTAL PROTECTION LEISURE LOCAL GREEN SERVICES URBAN AGRICULTURE Land Use Suitability Strategy Model
  • What we are currently working on Some important issues emerged with the work progress Land cover types provide the same contribution to evapotranspiration/ permeability Weighting each land cover type with a coefficient considering the different potential of evapotranspiration and permeability. Different results by Manual or Automatic Approaches? Testing on same study area Feature Analyst for land cover extraction
  • Thank you From land use to land cover: evapotranspiration assessment in a metropolitan region Daniele La Rosa [email_address] Università di Catania Dipartimento di Architettura e Urbanistica LA boratorio per la P rogettazione del T erritorio e dell’ A mbiente www.lapta.dau.unict.it Sesta Conferenza Nazionale in Informatica e Pianificazione Urbana e Territoriale – INPUT 2010 Potenza 13 - 15 Settembre 2010