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NGS eight heavy metals

Short title: 
NGS8HMC

This is a subset from the US National Geochemical Survey database (NGS), which contains 74,408 samples of 53(+286) attributes sampled over the period from (1979) 2003 to 2008. We focus on the following eight heavy metals: "As", "Cd", "Cr", "Cu", "Ni", "Zn", "As2", "Hg", "Pb". Please consider obtaining the original data directly from the NGS homepage.

Available layers: 
  • point map (74,408 locations) showing distribution of eight critical heavy metals;
Spatial structure: 
Formal class 'SpatialPointsDataFrame' [package "sp"] with 5 slots
  ..@ data       :'data.frame': 74408 obs. of  11 variables:
  .. ..$ AS_ICP40: num [1:74408] 5 5 5 15 5 5 5 5 5 5 ...
  .. ..$ CD_ICP40: num [1:74408] 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 ...
  .. ..$ CR_ICP40: num [1:74408] 120 63 160 130 120 120 43 300 100 70 ...
  .. ..$ CU_ICP40: num [1:74408] 49 32 51 60 45 41 28 94 57 52 ...
  .. ..$ NI_ICP40: num [1:74408] 60 29 69 93 45 40 22 86 67 45 ...
  .. ..$ ZN_ICP40: num [1:74408] 110 99 75 85 88 90 98 74 92 120 ...
  .. ..$ AS_AA   : num [1:74408] NA NA NA NA NA NA NA NA NA NA ...
  .. ..$ HG_AA   : num [1:74408] 0.01 0.01 0.01 0.08 0.01 0.01 0.01 0.01 0.08 0.01 ...
  .. ..$ PB_ICP40: num [1:74408] 11 12 4 2 5 5 11 2 2 5 ...
  .. ..$ CATEGORY: Factor w/ 6 levels "NURE","NURE SIEVED",..: 3 3 3 3 3 3 3 3 3 3 ...
  .. ..$ TYPEDESC: Factor w/ 16 levels "BEACH-SED","CANAL-SED",..: 10 10 10 10 10 10 10 10 10 10 ...
  ..@ coords.nrs : num(0)
  ..@ coords     : num [1:74408, 1:2] -1758399 -1757766 -1757551 -1757346 -1759941 ...
  .. ..- attr(*, "dimnames")=List of 2
  .. .. ..$ : NULL
  .. .. ..$ : chr [1:2] "coords.x1" "coords.x2"
  ..@ bbox       : num [1:2, 1:2] -10423650 277823 2255815 6536523
  .. ..- attr(*, "dimnames")=List of 2
  .. .. ..$ : chr [1:2] "coords.x1" "coords.x2"
  .. .. ..$ : chr [1:2] "min" "max"
  ..@ proj4string:Formal class 'CRS' [package "sp"] with 1 slots
  .. .. ..@ projargs: chr " +proj=aea +lat_1=29.5 +lat_2=45.5 +lat_0=23 +lon_0=-96 
+x_0=0 +y_0=0 +ellps=GRS80 +datum=NAD83 +units=m +no_defs +towgs84=0,0,"| __truncated__

proj4: 
+proj=aea +lat_1=29.5 +lat_2=45.5 +lat_0=23 +lon_0=-96 +x_0=0 +y_0=0 +ellps=GRS80 +datum=NAD83 +units=m +no_defs
Data owner: 

USGS / The National Geochemical Survey Team

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