On 08/05/2012 05:09 AM, mjkatsaros wrote:
Hi there! I'm following an awesome guide to working with spatial data
(http://www.frankdavenport.com/blog/2012/6/19/notes-from-a-recent-spatial-r-class-i-gave.html)
and am running into an error that I can't figure out how to fix.
Disclaimer: I am very much an R n00b
Here is the r script I am running:
https://dl.dropbox.com/u/28231177/This%20Should%20Work.R
data: https://dl.dropbox.com/u/28231177/my_data.csv
shapefile: https://dl.dropbox.com/u/28231177/sfzipcodes.zip
I am getting two errors:
pds<- fortify(sf_map)
*Using OBJECTID to define regions.*
pds$OBJECTID<- as.integer(pds$OBJECTID)
*Error in `$<-.data.frame`(`*tmp*`, "OBJECTID", value = integer(0)) :
replacement has 0 rows, data has 16249*
## Make the map
p1<- ggplot(my_data, aes(map_id = zip))
p1<- p1 + geom_map(aes(fill=vol, map_id = zip), map = pds)
p1<- p1 + expand_limits(x = pds$lon, y = pds$lat) + coord_equal()
p1 + xlab("Basic Map with Default Elements")
*Error in unit(x, default.units) : 'x' and 'units' must have length> 0*
Anybody have any idea what is happening here or how to resolve this?
Hi mjkatsaros,
The data file doesn't have a column labelled "OBJECTID". I would try
renaming the "zip" column to "OBJECTID".
Jim
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