The boundaries and dimensions of the box are as follows:
Dimensions
Min X Max X Max Y Min Y E-W N-S
Albers Equal -80000 290000 450000 60000 370000 390000
Area Projection (easting) (northing)
Approximate -79.0 -74.5 43.0 39.5 4.5 3.5
Lat/Long (longitude) (latitude)
The corners specified above should be used with GIS software packages such as Arc/Info. For gridded data used with image processing packages such as LAS or ERDAS, the coordinates of the upper left corner of the image specified by the LAS .ddr file or in the ERDAS header record refer to the CENTER of the upper left pixel; i.e., they are offset by one-half pixel from the corner of the bounding rectangle (the necessary adjustments are made automatically by Arc routines such as IMAGEGRID and GRIDIMAGE). To overlay data at different resolutions, therefore, the LAS/ERDAS upper left corner easting should be increased by one-half the grid cell size, and the northing decreased by one-half the grid cell size. For the lower right corner, the easting should be decreased by one-half the grid-cell size and the northing increased by the same amount. For the pixel (grid) dimensions commonly used for SRB data sets, this yields the pixel-center coordinates at the upper left and lower right corners and the image dimensions which are given below.
Pixel Size Image U. L. C. Image L. R. C. Image Size
(meters) Northing Easting Northing Easting (lines x pixels/line)
10000 445000 -75000 65000 285000 39 x 37
1000 449500 -79500 60500 289500 390 x 370
100 449950 -79950 60050 289950 3900 x 3700
Projection units: meters Spheroid: Clarke 1866 1st standard parallel: 40.0° N 2nd standard parallel: 42.0° N Central meridian: -78.0° (W) Latitude of origin: 39° N False easting: 0 False northing: 0