Running R version 2.6.1 under Linux, I'm trying to use the maps and mapdata packages and the state database to produce a thematic map of the USA. My problem is that cracks (white spaces) appear between some states--e.g. between Colorado and Utah and between Michigan and Indiana. The resulting visual impression is that the country is breaking up. This occurs in all the projections I have tried: albers, mercator, sinusoidal. An example of a command producing this effect is the following: map("state", regions=names48, projection="albers", par=c(36, 53), fill=T, col=rgb(red, green, blue, maxColorValue=255)) Suggests for filling the cracks would be very welcome. -John -- John P. Burkett Department of Environmental and Natural Resource Economics and Department of Economics University of Rhode Island Kingston, RI 02881-0808 USA phone (401) 874-9195
The problem was solved by specifying resolution=0 in the map() function. Would that saving the union had always been so easy and bloodless. -John John P. Burkett wrote:> Running R version 2.6.1 under Linux, I'm trying to use the maps and > mapdata packages and the state database to produce a thematic map of the > USA. My problem is that cracks (white spaces) appear between some > states--e.g. between Colorado and Utah and between Michigan and Indiana. > The resulting visual impression is that the country is breaking up. This > occurs in all the projections I have tried: albers, mercator, > sinusoidal. An example of a command producing this effect is the > following: > map("state", regions=names48, projection="albers", par=c(36, 53), > fill=T, col=rgb(red, green, blue, maxColorValue=255)) > Suggests for filling the cracks would be very welcome. > -John >-- John P. Burkett Department of Environmental and Natural Resource Economics and Department of Economics University of Rhode Island Kingston, RI 02881-0808 USA phone (401) 874-9195