Datasetcalculatedusing3x3-cellmovingwindow: Slope, aspect, aspect sine, aspect cosine, eastness,northness,roughness, terrainroughness index,vectorruggedness measure, topographic position index,topographic compound index (topographic wetnessindex), stream power index, convergence, profile/tangential curvature, first/second order partialderivativeand10geomorphologicallandformclasses. Downloadsample:https://bit.ly/2vnsv1i

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

5

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.