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Melelli Laura* & Floris Mario**. *lmelelli@unipg.it Department of Earth Sciences, University of Perugia *mario.floris@unipd.it Department of Earth Sciences, University of Padova. A new Geodiversity Index

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slide1

Melelli Laura* & Floris Mario**

*lmelelli@unipg.it

Department of Earth Sciences, University of Perugia

*mario.floris@unipd.it

Department of Earth Sciences, University of Padova

A new

Geodiversity Index

as a quantitative indicator of abiotic parameters to improve landscape conservation:

an Italian case study

European Geosciences Union

General Assembly 2011

slide2

Geodiversity:definition

Geodiversity: definition

Study area

Data analysis

Geodiversity Index

Conclusion

Biodiversity

Naturaldiversity

GEODIVERSITY

GEODIVERSITY

“the natural range (diversity) ofgeological(rocks, minerals, fossils), geomorphological(landform, physical processes) andsoilfeatures” (Gray, 2004)

“… and also topographyand elements of hydrosphere…” (Serrano & Ruiz-Flano, 2007)

  • Intrinsicvalue: “refersto the ethicalbeliefthat some things (in this case geodiversity) are of values simplyforwhatthey are ratherthanwhatthey can beusedforbyhumans (utilitarianvalue)” (Gray, 2004).
  • Cultural and aesthetic values: assignedby a community forwhich a particular site playsanimportantrole in termsof cultural and historicalheritage.
  • Scientific and educationalvalue: the importanceof geodiversity as a topicofscientificresearch, teaching and dissemination.
  • Economicvalue: the geo-diversity can beaneconomicresource, sometimesof prime importancefor the areas in whichitisrecognized.
slide3

Geodiversity:definition

Geodiversity: definition

Study area

Data analysis

Geodiversity Index

Conclusion

slide4

Geodiversity:definition

Geodiversity: definition

Study area

Data analysis

Geodiversity Index

Conclusion

GEODIVERSITY INDEX

Geological f.

Geomorphological f.

Land cover f.

Topographic f.

Maps, fieldsurvey

Maps, fieldsurvey

Maps, Remote Sensed data

DigitalElevationModel

  • GEOLOGICAL FORMATIONS
  • Geologicalcomplex
  • Bedding
  • Soiltype
  • LANDFORMS
  • Landformsactivity
  • Morphogeneticprocesses
  • LANDUSE
  • Hierarchicalclassificationoflanduse
  • TOPOGRAPHIC PARAMETERS
  • Roughness
  • Slope
  • Aspect
  • Curvature
slide5

Geodiversity:definition

Study area

Study area

Data analysis

Geodiversity Index

Conclusion

Geosites in the Umbria Region

Regional and National Parks

slide6

Geodiversity:definition

Study area

Study area

Data analysis

Geodiversity Index

Conclusion

Geology

Fluvial Lacustrine Deposits

(Olocene-Pliocene)

Low slope values

Terrigenous Complex

(Miocene)

Medium slope values

Calcareous Complex

(Trias up. – Oligocene)

High slope values

SubasioRegional Park

slide7

Geodiversity:definition

Study area

Study area

Data analysis

Geodiversity Index

Conclusion

The Subasio Mountain Regional Park

Subasio Mt.

Subasio Mt. 1287m

slide8

Geodiversity:definition

Study area

Data analysis

Data analysis

Geodiversity Index

Conclusion

GEODIVERSITY INDEX

G.I.S.

GRID format

GI = Eg IR/lnS

Serrano & Ruiz-Flano, 2007

Vi = each abiotic factorthatcontributesto GI withmappingcharacteristicsofspatial CONTINUITY (geologicalsubstrate, soil cover, landuse).

Gmi = each abiotic factorcontributingto the geodiversity definitionwithmappingcharacteristicsofspatial DISCONTINUITY (morphogeneticprocesses).

Sa = "surface area”: a grid in which the cell values reflect the topographicsurface area withinthatcell.

Pa = "planimetric area”, the squareof the resolutionof the elevationmodel.

ln Sa = naturallogarithmof Sa

GI = Geodiversity Index

Eg = numberofdifferentelements in the studysquare (total diversity).

IR = roughnessparameter

ln = naturallogarithm

S = area of the square (ha)

slide9

Geodiversity:definition

Study area

Data analysis

Data analysis

Geodiversity Index

Conclusion

FocalFunctions

NeighborhoodStatics

Variety

Input layer

Cellsize – 25m

Low

Output layer

Medium

High

ArcGIS 9.3 SpatialAnalysttools – Neighboorhood - Focalstatistics - Variety

slide10

Geodiversity:definition

Study area

Data analysis

Data analysis

Geodiversity Index

Conclusion

Localfunctions

SUM

Mass wasting

MERGE

Input

layer

Fluvialprocess

MERGE

Overlay

layer

1

Output

layer

Anthropic

Karst

Mass wasting

Fluvial

Structural

  • ArcGIS 9.3 SpatialAnalysttools – Merge - Raster Calculator–-Sum(ingrid1, ingrid2, ingrid3…)
slide11

Geodiversity:definition

Study area

Data analysis

Data analysis

Geodiversity Index

Conclusion

Arithmeticoperators “+”

Geologicalvariety

Geomorphological variety

Landcovervariety

ArcGIS 9.x SpatialAnalysttools – Raster Calculator - Arithmeticoperators “+”

slide12

Geodiversity:definition

Study area

Data analysis

Data analysis

Geodiversity Index

Conclusion

Planimetric area

Surface area

Sa1 < Sa2 < Sa3

Model 1 IR = 1.1

Landscapemodelwhere the geomorphological processes are more active and withmuchvariability …

Model 2 IR = 2

Terrain roughness is a term used to describe how “irregular” an area is

ROUGHNESS INDEX

Sa Pa

Surface area / Planimetric Area

Terrain roughness is a term used to describe how “irregular” an area is

ROUGHNESS INDEX

Model 3 IR = 3

slide13

Geodiversity: definition

Study area

Data analysis

Data analysis

Geodiversity Index

Conclusion

  • Roughnessisdipendentonly on DEM, not on fields data.
  • - Roughness can becomeanimportantindicatorfor GI identification

Jenness, J. 2009.

Surface Area and Ratio for ArcGIS

(surface area.exe).

http://www.jennessent.com/arcgis/surfacearea.htm.

  • ArcGIS 9.x - Surface-area.ext
slide14

Geodiversity:definition

Study area

Data analysis

Geodiversity Index

Geodiversity Index

Conclusion

1) High values correspondingto geosites

44%

LowGI

19%

37%

High GI

Medium GI

slide15

Geodiversity:definition

Study area

Data analysis

Geodiversity Index

Geodiversity Index

Conclusion

2) High values correspondingto high topographicindex (roughness)

slide16

Geodiversity:definition

Study area

Data analysis

Geodiversity Index

Geodiversity Index

Conclusion

3) High values correspondingtoactive geomorphological processes

slide17

Geodiversità: definizione

Geodiversity:definition

Area di studio

Study area

Elementi di geodiversità

Data analysis

Analisi dei dati

Geodiversity Index

Indice quantitativo

Conclusion

Conclusion

Conclusioni

PRELIMINARY RESULTS

FUTURE PLANS

  • The advancementofknowledgeon the identificationof geodiversity for the developmentof the naturalheritage,
  • A quantitativeapproachto the geodiversity assessmentcomparable in differentareas,
  • A upgradabledigital database,
  • A tooltoidentifyareaswithpotentialvalueof the abiotic component,
  • An instrumentforeconomicdevelopment and conservation management “in order to predict future evolution, changes and impacts of different land uses, management and planning actions and climatic inputs”…
  • Repeate the process in severalareaswithdifferentmorphogenetic and geologicalcontext
  • The improvementof the topographic data role in the GI assessment
  • Repeate the processwithdifferentcellsizeresolutiontoobserve the differences in GI behaviour

Thanksforyourattention!