Dataset calculated using 3x3-cell moving window: Slope, aspect, aspect sine, aspect cosine, eastness, northness, roughness, terrain roughness index, vector ruggedness measure, topographic position index, topographic compound index (topographic wetness index), stream power index, convergence, profile/ tangential curvature, first/second order partial derivative and 10 geomorphological landform classes. Download sample: https://bit.ly/2vnsv1i G EOMORPHO90 M GLOBAL HIGH - RESOLUTION GEOMORPHOMETRY LAYERS FOR ENVIRONMENTAL MODELLING METHOD & TOPOGRAPHIC VARIABLES DEM DATA SOURCES Multi-Error-Removed Improved-Terrain (MERIT-DEM; 90m) Yamazaki, Dai, et al. "A high-accuracy map of global terrain elevations." Geophysical Research Letters 44.11 (2017): 5844-5853. USGS National Elevation Dataset (NED-DEM; 30m) Gesch, Dean, et al. "The national elevation dataset." Photogrammetric engineering and remote sensing 68.1 (2002): 5-32. OBJECTIVES o Create a suite of topographic complexity variables at 90m spatial grain for environmental modeling applications o Compare the results obtained from two digital elevation models COMPARISON: MERIT-VAR VS NED-VAR MERIT and NED DEMs and their correlations are depicted in plots a-c above. The others plots show the first order derivative (i.e., rate of change through space measured in degrees) of the difference between MERIT-derived vs NED-derived topographic variables. Giuseppe Amatulli 1 , Sami Domisch 2 , Daniel Mc-Inerney 3 , Tushar Sethi 4 , Peter Strobl 5 1 Yale University, School of Forestry & Environmental Studies - Center for Research Computing, New Haven, USA ; 2 Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Berlin, Germany; 4Spatial-Ecology, Meaderville House, Wheal Buller, Redruth, Cornwall, TR16 6ST, UK; Coillte, Irish State Forestry Board, Plassey Road, Castletroy, Limerick, Ireland; 5 European Commission, Joint Research Centre, Directorate for Sustainable Resources, Ispra, Italy Confusion matrix of geomorphic form MERIT-derived vs NED- derived variables. First order derivative mean values for each topographic variable - calculated from the difference between MERIT- derived vs NED-derived variables. The two lines represent values for two study areas (tiles: 6000x6000 3arc-sec cell) in the USA. Vertical lines represent half of the standard deviation for the tiles of the first order derivative of the topographic variables.

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Page 1: GEOMORPHO 90M GLOBAL HIGH RESOLUTION …

GEOMORPHO90M GLOBAL HIGH-RESOLUTION GEOMORPHOMETRY LAYERS FOR

ENVIRONMENTAL MODELLING

METHOD&TOPOGRAPHICVARIABLES

DEMDATASOURCES

Multi-Error-RemovedImproved-Terrain(MERIT-DEM;90m) Yamazaki,Dai,etal."Ahigh-accuracymapofglobalterrainelevations."GeophysicalResearchLetters44.11(2017):5844-5853.

USGSNationalElevationDataset(NED-DEM;30m) Gesch,Dean,etal."Thenationalelevationdataset."Photogrammetricengineeringandremotesensing68.1(2002):5-32.

OBJECTIVES

o  Createasuiteoftopographiccomplexityvariablesat90mspatialgrainforenvironmentalmodelingapplications

o  Comparetheresultsobtainedfromtwodigitalelevationmodels

COMPARISON:MERIT-VARVSNED-VAR

MERIT and NED DEMs and their correlations aredepictedinplotsa-cabove.Theothersplotsshowthefirstorderderivative(i.e.,rateofchangethroughspacemeasured in degrees) of the difference betweenMERIT-derivedvsNED-derivedtopographicvariables.

GiuseppeAmatulli1,SamiDomisch

2,DanielMc-Inerney

3,TusharSethi

4,PeterStrobl

1YaleUniversity,SchoolofForestry&EnvironmentalStudies-CenterforResearchComputing,NewHaven,USA;

2Leibniz-InstituteofFreshwaterEcologyandInlandFisheries,Berlin,Germany;

4Spatial-Ecology,MeadervilleHouse,WhealBuller,Redruth,Cornwall,TR166ST,UK;Coillte,IrishStateForestryBoard,PlasseyRoad,Castletroy,Limerick,Ireland; 5EuropeanCommission,JointResearchCentre,DirectorateforSustainableResources,Ispra,Italy

ConfusionmatrixofgeomorphicformMERIT-derivedvsNED-derivedvariables.

Firstorderderivativemeanvaluesforeachtopographicvariable-calculatedfromthedifferencebetweenMERIT-derivedvsNED-derivedvariables.Thetwolinesrepresentvaluesfortwostudyareas(tiles:6000x60003arc-seccell)intheUSA.Verticallines

representhalfofthestandarddeviationforthetilesofthefirstorderderivativeofthetopographicvariables.