makePeak: Wrapper function that perform some morphometric Digital...
In gisma/perfectPeak: Calculates the perfect peaks

Description Usage Arguments Details Value Author(s) References Examples

Currently two different approaches are available. First a simple approach using a filtered DEM that is then analysed for local maxima (SAGA's minmax module) is used. Second a more sophisticaded approach that classify the landforms of a DEM is utilized and with a first estimation of prominence and dominance analysis fileterd. If you choose this approach names of external data like Hattys Bergliste or the OSM data are merged to the generic DEM peaks. Additionally external point data from several sources can be used to name these unknown peaks. For further information look in the reference section and the INI file.

1	makePeak(fname.DEM,iniparam,myenv)

fname.DEM

name of georeferenced DEM data in GDAL format

iniparam

the full set of params as provided initEnvironGIS(). please look into the INI file for further settings of the makePEak() mode and special settings. peak.mode

(1) minmax: extracts local maxima altitudes from an arbitrary Digital Elevation Model (DEM) (optionally you may filter the data)

(2) merged approach: extract peaks from a DEM by analyzing morphometry and landscape forms using the algorithm of Wood et others. The peak landforms are analyzed for MAximunm heights and this location is related to external peak data from Harrys peaklist or OSM

myenv

SAGA environment variables provided by initEnvironGIS()

coming soon

makepeak basically returns a list of coordinates altitudes (and names) that will be used to calculate the independence value.

Chris Reudenbach

Marburg Open Courseware Advanced GIS: http://moc.environmentalinformatics-marburg.de/doku.php?id=courses:msc:advanced-gis:description

Rasemann, S., (2004), Geomorphometrische Struktur eines mesoskaligen alpinen Geosystems, Asgard-Verlag, St. Augustin, Bonner Geographische Abhandlungen, Heft Nr. 111, URL: http://hss.ulb.uni-bonn.de/2003/0211/0211.htm

Wood, J.D., (1996), The geomorphological characterisation of digital elevation models. PhD Thesis, University of Leicester, UK

Schmidt, J, & A. Hewitt, (2004). Fuzzy land element classification from DTMs based on geometry and terrain position. Geoderma 121.3, S.243-256. URL: http://home.shirazu.ac.ir/~kompani/geomorphology/geomorphology-lec-papers-mehr88/schmidt-fuzzylandsurfaceclassifi-geoderma2004.pdf

Breitkreutz, H.: Gipfelliste. URL: http://www.tourenwelt.info/commons/download/bergliste-komplett.kmz.php

OSM natural: keys http://wiki.openstreetmap.org/wiki/Key:natural

  
 #### Example to makePeaks in a specified ROI and 
 #### create a dataframe containing coordinates, altitude and name and corresponding parameters
# assign file names
ini.demo=system.file("data","demo.ini", package="perfectPeak")
dem.demo=system.file("data","demo.asc", package="perfectPeak")

# get ini params and myenv
tmp<-initEnvironGIS(ini.demo,dem.edemo)
ini<-tmp$ini
myenv<-tmp$myenv
#define traget projection
target.projection<-'+proj=tmerc +lat_0=0 +lon_0=10.33333333333333 +k=1 +x_0=0 +y_0=-5000000 +ellps=bessel +towgs84=577.326,90.129,463.919,5.137,1.474,5.297,2.4232 +units=m +no_defs'
peak.list=makePeak(fname.DEM=dem.demo,iniparam=ini,myenv=myenv)
peak.list