Presentation is loading. Please wait.

Presentation is loading. Please wait.

Fuzzy Land Cover/Land Use Ontologies – GeoVoCamp 2011 Ola Ahlqvist, Department of Geography Fuzzy Land Cover/Land Use Ontologies Ola Ahlqvist, PhD Department.

Similar presentations


Presentation on theme: "Fuzzy Land Cover/Land Use Ontologies – GeoVoCamp 2011 Ola Ahlqvist, Department of Geography Fuzzy Land Cover/Land Use Ontologies Ola Ahlqvist, PhD Department."— Presentation transcript:

1 Fuzzy Land Cover/Land Use Ontologies – GeoVoCamp 2011 Ola Ahlqvist, Department of Geography Fuzzy Land Cover/Land Use Ontologies Ola Ahlqvist, PhD Department of Geography The Ohio State University ahlqvist.1@osu.edu

2 Fuzzy Land Cover/Land Use Ontologies – GeoVoCamp 2011 Ola Ahlqvist, Department of Geography Land use and land cover data Importance –climate modeling, urban planning, landscape change assessment, hydrological models, and unknown future issues –Demand that data can be re-purposed for a variety of end uses Initiatives –Standards: National Vegetation Classification Standard (Vegetation Subcommittee, 1997), the Nordic Landscape Monitoring Project (Groom, 2005), the CORINE Land Cover (CEC, 1995 and 1999; Bossard et al., 2000), the standard classification for land cover of South Africa (Thompson, 1996), GLC2000 (Bartholomé and Belward, 2005), UNEP/FAO Land Cover Classification System (LCCS) (Di Gregorio and Jansen, 2000)

3 Fuzzy Land Cover/Land Use Ontologies – GeoVoCamp 2011 Ola Ahlqvist, Department of Geography A traditional land cover taxonomy Easily translated to an ontology description language as class- subclass relations and class specific properties But no agreement on a unified taxonomy –CORINE –GlobCover –MODIS/IGBP Not even our own USGS system could stay the same from one time to the other –National Land Cover Data (NLCD) used slightly different classes in 1992 and 2001

4 Fuzzy Land Cover/Land Use Ontologies – GeoVoCamp 2011 Ola Ahlqvist, Department of Geography 11 Open Water 21 Developed, Open Space 22 Developed, Low Intensity 23 Developed, Medium Intensity 24 Developed, High Intensity 31 Barren Land (Rock/Sand/Clay) 41 Deciduous Forest 42 Evergreen Forest 43 Mixed Forest 81 Pasture/Hay 82 Cultivated Crops 90 Woody Wetlands 95 Emergent Herbaceous Wetlands National Land Cover Data (NLCD) change example Different classification systems create problems! ? ?

5 Fuzzy Land Cover/Land Use Ontologies – GeoVoCamp 2011 Ola Ahlqvist, Department of Geography 0 2 4 6 8 10 12 14 16 020406080100 Canopy cover (%) Tree height (m) Sudan UNESCO Tanzania Jamaica Zimbabwe Turkey United States Estonia China Same issues around global definitions of forest after Lund (2006) and Comber et al. (2006)

6 Fuzzy Land Cover/Land Use Ontologies – GeoVoCamp 2011 Ola Ahlqvist, Department of Geography Solutions? The FAO and UNEP Land Cover Classification System (LCCS) –multi-purpose classification system –capable of comparing land cover types across taxonomies –uses diagnostic criteria rather than pre-defined classes Now at v.3 - Land Cover Meta Language (LCML) –a predefined set of land cover basic objects are enriched on their semantic significance with external qualities and attributes –Use of UML and XML for formal description of an ontology –http://www.glcn.org/ont_2_en.jsp

7 Fuzzy Land Cover/Land Use Ontologies – GeoVoCamp 2011 Ola Ahlqvist, Department of Geography Example formalization of land cover definitions

8 Fuzzy Land Cover/Land Use Ontologies – GeoVoCamp 2011 Ola Ahlqvist, Department of Geography Parameterization using FAOs Land Cover Classification System v.2 Unnecessarily crude where detail is actually available

9 Fuzzy Land Cover/Land Use Ontologies – GeoVoCamp 2011 Ola Ahlqvist, Department of Geography With v.3 - Land Cover Meta Language (LCML) U.S. NLCD 1992 Low Intensity Residential

10 Fuzzy Land Cover/Land Use Ontologies – GeoVoCamp 2011 Ola Ahlqvist, Department of Geography Attributes values allow for evaluation of category semantics Two metrics of semantic relations –Distance –Overlap U.S. NLCD 1992 Low Intensity ResidentialU.S. NLCD 2001 Developed, Low Intensity

11 Fuzzy Land Cover/Land Use Ontologies – GeoVoCamp 2011 Ola Ahlqvist, Department of Geography Attributes values allow for evaluation of category semantics Overlap -1 Distance Very similar classes Similar but Disjoint classes Class/ subclass relationship Very different classes Two metrics of semantic relations –Distance –Overlap Bivariate color scheme –Different types of change

12 Fuzzy Land Cover/Land Use Ontologies – GeoVoCamp 2011 Ola Ahlqvist, Department of Geography But land cover/use concepts are rarely clear cut… Fuzzy set theory and fuzzy numbers allow for vagueness Closed Tree Cover Open Shrub Cover Sparse vegetation

13 Fuzzy Land Cover/Land Use Ontologies – GeoVoCamp 2011 Ola Ahlqvist, Department of Geography …and they typcially have many attribute dimensions Comparison in 16D can be summarized 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 U.S. NLCD 1992 Low Intensity ResidentialU.S. NLCD 2001 Developed, Low Intensity

14 Fuzzy Land Cover/Land Use Ontologies – GeoVoCamp 2011 Ola Ahlqvist, Department of Geography 1992 /11 1992 /21 1992 /22 1992 /23 1992 /32 1992 /33 1992 /41 1992 /42 1992 /43 1992 /81 1992 /82 1992 /85 1992 /91 1992 /92 2001 Open water5.6000.40.100.50.20.10.40.1000 Developed, Open Space0.351.60.84.80.30.519.9410.532.05.32.800.2 Developed, Low Intensity0.323.51.66.80.61.312.12.13.621.35.60.100.3 Developed, Med. Intensity0.39.31.79.41.31.13.50.40.55.92.7000.2 Developed, High Intensity0.11.90.64.70.70.40.500.10.90.7000 Barren Land (Rock/Sand/ Clay)0.12.800.3 7.81.72.14.10.8000.1 Deciduous Forest1.210.50.11.40.10.8408.78.222.673.93.802.41.3 Evergreen Forest0.11.400.1007.34.832.80.100 Mixed Forest00000000000000 Pasture/ Hay1.119.40.32.00.112.8114.526.240.8476.354.10.50.81.3 Cultivated Crops0.66.70.22.40.42.373.55.510.7169.359.60.10.61.1 Woody Wetlands1.21.600.60.1 19.91.41.35.20.601.70.7 Emergent Herbaceous Wetlands0.80.40 0.102.60.40.32.20.6000.3 1992 Open Water Low intensity residential High intensity residential Commercial/ Industrial/ Transportation Quarries/ Strip Mines/ Gravel Pits Transitional Deciduous Forest Evergreen Forest Mixed Forest Pasture/Hay Row Crops Urban/ Recreational Grasses Woody Wetlands Emergent Herbaceous Wetlands Semantic relations summarized in matrix form Overlap -1 Dissemblance

15 Fuzzy Land Cover/Land Use Ontologies – GeoVoCamp 2011 Ola Ahlqvist, Department of Geography Water Developed Barren Vegetated (Forest) Shrub land Non-natural woody Grasslands Herbaceous planted Wetlands National Land Cover Data MDS of class definitions 1992 2001 … with the semantic similarity metrics we can compare within and across conceptual spaces

16 Fuzzy Land Cover/Land Use Ontologies – GeoVoCamp 2011 Ola Ahlqvist, Department of Geography Semantic change image Summarize landscape change from a cognitive perspective An overall, spatially explicit evaluation of land cover change throughout the study area Nuanced assessments of graded changes even for heterogeneous, nominal land cover types

17 Fuzzy Land Cover/Land Use Ontologies – GeoVoCamp 2011 Ola Ahlqvist, Department of Geography Some references Ahlqvist, O., 2004, A parameterized representation of uncertain conceptual spaces, Transactions in GIS, 8(4), 493-514. Ahlqvist, O., 2008, Extending post classification change detection using semantic similarity metrics to overcome class heterogeneity: a study of 1992 and 2001 National land Cover Database changes, Remote Sensing of Environment, 112(3):1226-1241 Comber, A., Fisher, P., and Wadsworth, R., 2006, What is land cover?, Environment and Planning B, 32: 199-209 Gärdenfors, 2000, Conceptual Spaces: The geometry of thought, MIT press. Kaufman A and Gupta M M, 1985, Introduction to fuzzy arithmetic. New York, Van Nostrand Reinhold Company Lund, H.; Gyde (coord.) 2006. Definitions of Forest, Deforestation, Afforestation, and Reforestation. [Online] Gainesville, VA: Forest Information Services. http://home.comcast.net/~gyde/DEFpaper.htm. Global Land Cover Network (GLCN) - http://www.glcn.org/index_en.jsphttp://www.glcn.org/index_en.jsp - Land cover Ontology - http://www.glcn.org/ont_0_en.jsphttp://www.glcn.org/ont_0_en.jsp - ISO standard - Part 1 & 2 http://www.iso.org/iso/iso_catalogue/catalogue_tc/catalogue_detail.htm?csnumber=32562 http://www.iso.org/iso/iso_catalogue/catalogue_tc/catalogue_detail.htm?csnumber=32562 http://www.iso.org/iso/iso_catalogue/catalogue_tc/catalogue_detail.htm?csnumber=44342 U.S. National Land Cover Database - http://www.mrlc.gov/http://www.mrlc.gov/


Download ppt "Fuzzy Land Cover/Land Use Ontologies – GeoVoCamp 2011 Ola Ahlqvist, Department of Geography Fuzzy Land Cover/Land Use Ontologies Ola Ahlqvist, PhD Department."

Similar presentations


Ads by Google