[R-sig-Geo] dataframe access from SpatialLinesDataFrame and psp line segment identification

[Julius Tesoro]

Hello again guys!

I wanted to extract an attribute on the data.frame from the SpatialLinesDataFrame nearest to the given points. I have a point pattern ("ppp") converted from a SpatialPointsDataFrame and I also have a line segment pattern("psp") converted from a SpatialLinesDataFrame. I used project2segment() to identify the distance from each point to the nearest line. 

I got the following results:

project2segment(rs2,faults.psp)

$Xproj
marked planar point pattern: 15 points 
marks are numeric, of type 'integer' 
window: rectangle = [2041800, 2055500] x [5483700, 5497500] units 

$mapXY
 [1] 454 454 452 454 454 454 452 452 452 452 452 452 452 452 452

$d
 [1] 33968.58 34510.82 34858.51 30815.14 38627.78 40485.38 40898.08 41335.99
 [9] 36471.86 32670.05 42284.76 42614.63 43422.89 30598.01 41518.95

$tp
 [1] 0.0000000 0.0000000 0.5489390 0.0000000 0.0000000 0.0000000 0.6827169
 [8] 0.6040709 0.4998253 0.5010383 0.6046778 0.6081116 0.6547277 0.4724737
[15] 0.5071538

How are these segments identified in a map? Are these numbers in $mapXY found from the original "SpatialLinesDataFrame" from which it was converted? 

Thanks.