RADARSAT data set jan1797.bil and the accompanying text header (jan1797.hdr):
nrows 9104
ncols 7840
nbands 1
nbits 16
layout bil
skipbytes 0
ulxmap 286727
ulymap 8729940
xdim 6.25
ydim 6.25
and the ERMAPPER header file jan1797.ers, have been copied from the CDROM to the
d: hard drive directory d:\barron. (The header files only have also been copied to
c:\aacrse\505\radarsat.)
The RADARSAT jan1797.bil file was then renamed jan1797.img, and an
image .doc file prepared where the image is identified as integer binary and min. X =
286727, max. X = 286727 + (columns x the resolution 6.25), min Y = 8729940, and
max. Y = 8786840, e.g.

file title :
data type : integer
file type : binary
columns : 7840
rows : 9104
ref. system : plane
ref. units : m
unit dist. : 1
min. X : 286727
max. X : 286727 + 49000 = 335727
min. Y : 56900
max. Y : 8729940 + 56900 = 8786840
pos'n error : unknown
resolution : 6.25
min. value : 0
max. value : 255
value units : m
value error : unknown
flag value : none
flag def'n : none
legend cats : 0

Since the .bil file is in 16 bit byte integer format, the jam1797.img image file
was converted to an 8 bit byte binary file using the IDRISI REFORMAT-CONVERT
procedure. The file will be half the size of the original (71,375,360 bytes, small enough
to store on a 100Mb jiffy disk), and the related IDRISI .doc file will record that the file
is now byte binary. A copy of the converted .bil image is contained in d:\barron\ as
jan17bbi.img and the document file is jan17bbi.doc. The original RADARSAT image
on the CDROM can also be viewed in ERMAPPER and PCI. A stretched version
barrst.img can be produced using the limits of 10 and 77. Saving the file as byte packed
binary only increases the file size.
Use the adaptive box filter using std dev of 1.5 and threshold value of 0.

The usrguide.zip file in c:\aacrse\505\radarsat is a zipped acrobat file describing
RADARSAT, and the unzipped file is called usguide.pdf. Double click the latter to view
in ACROBAT.

A copy of the RADARSAT Geology Handbook is available from Dr. Church.

FIGURES

Figure 1. Plate Tectonics.

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