[R-sig-Geo] Rasterize point process using specific rule

[ASANTOS]

Dear members,

I've like to create a raster using my event coordinates and information 
about the size in this coordinates as a rule for my raster creation. 
First, I make:

library(raster)
library(spatstat)

#Points coordinates in UTM
xp<-c(371278.588,371250.722,371272.618,371328.421,371349.974,
371311.95,371296.265,371406.46,371411.551,371329.041,371338.081,
371334.182,371333.756,371299.818,371254.374,371193.673,371172.836,
371173.803,371153.73,371165.051,371140.417,371168.279,371166.367,
371180.575,371132.664,371129.791,371232.919,371208.502,371289.462,
371207.595,371219.008,371139.921,371133.215,371061.467,371053.69,
371099.897,371108.782,371112.52,371114.241,371176.236,371159.185,
371159.291,371158.552,370978.252,371120.03,371116.993)

yp<-c(8246507.94,8246493.176,8246465.974,8246464.413,8246403.465,
8246386.098,8246432.144,8246394.827,8246366.201,8246337.626,
8246311.125,8246300.039,8246299.594,8246298.072,8246379.351,
8246431.998,8246423.913,8246423.476,8246431.658,8246418.226,
8246400.161,8246396.891,8246394.225,8246400.391,8246370.244,
8246367.019,8246311.075,8246255.174,8246255.085,8246226.514,
8246215.847,8246337.316,8246330.197,8246311.197,8246304.183,
8246239.282,8246239.887,8246241.678,8246240.361,8246167.364,
8246171.581,8246171.803,8246169.807,8246293.57,8246183.194,8246189.926)

#Now I have the size of each nest in meters (marked process)

area<-c(117,30,4,341,15,160,35,280,108,168,63,143,2,48,182,42,
88,56,27,156,288,45,49,234,72,270,91,40,304,56,35,4,56.7,9,4.6,
105,133,135,23.92,190,12.9,15.2,192.78,104,255,24)

# Make a contour for the window creation
W <- convexhull.xy(xp,yp)

#Create ppm object
syn.ppp <- ppp(x=xp,y=yp,window=W, marks=area)

# Plot the point process
plot(syn.ppp)

#Definition of raster resolution - 1 meter square
ext <- as(extent(c(W$xrange,W$yrange)), "SpatialPolygons")
syn.ras.res<-rasterToPoints(raster(ext, resolution = 1), spatial = TRUE)

#Now Rasterize
syn.ras<- rasterize(syn.ras.res using coords, raster(syn.ras.res), *?????*)

I' ve like to create some kind of rule in *?????*, where pixel values in 
my final raster was 1 when inside de area (marks=area) and zero for 
outside de circular area given by points coordinates 
(syn.ras.res using coords) using 1 meter as resolution?

Any ideas, please

Thanks,

-- 
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Alexandre dos Santos
Prote??o Florestal
IFMT - Instituto Federal de Educa??o, Ci?ncia e Tecnologia de Mato Grosso
Campus C?ceres
Caixa Postal 244
Avenida dos Ramires, s/n
Bairro: Distrito Industrial
C?ceres - MT                      CEP: 78.200-000
Fone: (+55) 65 99686-6970 (VIVO) (+55) 65 3221-2674 (FIXO)

         alexandre.santos using cas.ifmt.edu.br
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