## Geographic coordinates for STATSGO data

The geographic coordinates used for the 48 conterminous states are in
seconds of arc, with west longitude values denoted by negative numbers.
**NOTE that geographic coordinates are NOT a projection -- scales
vary with latitude and are substantially different in the x and y
directions, and the 30-arcsec grid cells are neither square nor equal in
area.**

The spheroid in terms of which the latitude and longitude are defined
has the following characteristics:

Datum: NAD27
Spheroid: CLARKE1866
Units: arcseconds

Relative to this cooordinate system, the polygon version of the dataset
has the following bounding coordinates: Xmin = -449054 (124°44'14" W)
Xmax = -241021 (66°57'01" W)
Ymin = 88365 (24°32'45" N)
Ymax = 177784 (49°23'04 N)

For the 30-arcsec grid version, the bounding coordinates were extended
outwards to an exact multiple of 1 arcminute, giving Xmin = -449100 (124°45' W)
Xmax = -241020 (66°57' W)
Ymin = 88320 (24°32' N)
Ymax = 177840 (49°24' N)
nrow = 2984
ncol = 6936
cellsize = 30

For most image processing software packages, the coordinates of the
**center** of the **upper left** (northwest)
cell should be entered as x = -449085, y = 177825

Last change: 22 Dec 1995,
R. A. White / raw@essc.psu.edu