Hi all 

I am fairly new to GIS and R and am trying to download, reproject, mosaic and save MODIS NDVI and EVI data as a geotiff. I need tiles from across North America, so a lot of data and would prefer to find an automatic solution. I've come across modisDownload but can't seem to get it to work…I think the code below manages  to download the hdf files but I don't see the geotiff mosaic file that I expect (code based on tutorial found at http://r-gis.net/?q=ModisDownload):

I am using a mac and the MRT bin folder is stored in my "Applications" folder.
######### setwd("./MODIS") # set directory to location R script and where I want the output
mrtpath<-"/Applications/bin" # tell R where MRT is stored
source('ModisDownload.R') # run the R script from r-gis.net
library(RCurl) #raster package is already loaded
x=3 # Now as per the online tutorial which gives code to do the following
# Downloads selected tiles, and mosaic, reproject them in UTM_WGS84, zone 30 projection and convert all bands into Geotif format (the original HDF
will be deleted!)
ModisDownload(x=x,h=c(17,18),v=c(4,5),dates="2011.05.01",MRTpath=mrtpath,proj_type="UTM",utm_zone=30,datum="WGS84",pixel_size=1000) ######### 

Can anyone tell me what I'm doing wrong? The code seems to run but only produces four hdf files… I'm open to other suggestions as to how to get and process MODIS data…even the MRT tool seems to be giving me trouble so if there is a step-by-step tutorial for beginners out there for how to do this, I'd really appreciate a point in the right direction!

Thanks
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