file format : GeoTIFF File Format
file title  : shipping
last update : 30-March-2010
producer    : T. Hengl
lineage     : http://spatial-analyst.net/scripts/getNCEASData.R
data type   : Float32
gdal driver : GTiff
columns     : 7200
rows        : 3600
meas. scale : numeric
description : Shipping density (commercial)
proj4string : +proj=longlat +ellps=WGS84
ref. system : geographic
ref. units  : arcdegrees
unit dist.  : 1
min. X      : -180
max. X      : 180
min. Y      : -90
max. Y      : 90
pos'n error : 1000
resolution  : 0.05
min. value  : 0
max. value  : 1
display min : 0
display max : 1
value units : relative density index
value error : unspecified
flag value  : -1
flag def'n  : unavailable data
src. Eng    : A Global Map of Human Impacts to Marine Ecosystems 
src. URL    : http://www.nceas.ucsb.edu/globalmarine/impacts
src. scale  : 1 km
src. refs   : Halpern, B.S., et al. 2008. A Global Map of Human Impact on Marine Ecosystems. Science 319(5865):948-952. http://dx.doi.org/10.1126/science.1149345
src. date   : 2008
src. owner  : University of California, National Center for Ecological Analysis and Synthesis
legend cats : 0