R converting latitude and longitude point and shapefiles for ppp objects -


i trying use ppp function spatial point data in r. understand 1 needs euclidean distances rather latitude , longitude. wondering how take point data , shapefile area , convert them useable ppp object.

so used code below point data , have looks might reasonable. unfamiliar crs projections , not sure correctly defined things. instance can define proj4string longlat or conversion wgs84.

latlong<-asa[,304:305]  #not sure if doing think doing (converting lat/long format euclidean distance):  id.spp <- spatialpointsdataframe(coords = latlong, proj4string = crs("+proj=longlat +ellps=wgs84 +datum=wgs84 +no_defs"), data = asa)  #i tried using input lat long without second part. both give workable output, not sure if correct id.spp2 <- spatialpointsdataframe(coords = latlong, proj4string = crs("+proj=longlat "), data = asa)  #i converted both versions using code below: ppp<-as(as(id.spp, "spatialpoints"), "ppp")  plot(ppp)  plot(studyarea_gcs, add=t)  #appears reasonably surround points in anticipated way though did not type of conversion - in lat/long.   #the lat/long points, appear in same place ppp points.  points(latlong,pch=".")

thanks!


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