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GSF header format
I’m writing a program that outputs GSF files and I found an oddity in the header. The order of the numbers is south, west, north, east, width, height. The latitude comes first in the first two pairs, but the longitude first in the third. However, in the PDF that describes the format (currently at http://web.carlsonsw.com/files/knowledgebase/kbase_attach/716/Geoid%20Separation%20File%20Format.pdf), they are the first line, the second line, the third line, the fourth line, the fifth line, and the fourth line. I’m wondering if the guy who wrote the description exchanged the last two lines.
Here are the heads of the GSF files I have:
$ head *.gsf
==> avl150.gsf <==
34.2333334
275.7833333
36.9333333
279.0999999
199
162
0.00000
0.00000
0.00000
0.00000==> avl-clt150.gsf <==
33.8833333
275.7833333
36.9333333
280.8166667
302
183
0.00000
0.00000
0.00000
0.00000==> NCAsheville100M.gsf <==
35.0167
276.1000
36.9833
278.0667
118.0
118.0
-28.6088
-28.5944
-28.5813
-28.5606==> NCGreenHill150KM.gsf <==
34.5000
277.0500
36.3333
278.8833
110.0
110.0
-30.5497
-30.5496
-30.5468
-30.5428==> test.gsf <==
-2.0000000
358.0000000
2.0000000
2.0000000
4
4
-2.88708
-2.14380
-1.27551
-0.28223
The first two are produced by my program (the data are zero because I haven’t yet written the routine to fill the output geolattice with data from the input geolattice), the ones beginning NC are produced by Carlson, and the last one is test data used by my program. All the GSF files I’ve seen produced by Carlson have as many rows as columns. Can any of you confirm or deny that the fifth line is the width and the sixth the height?
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