Getting ETOPO1 to work with FT3

Byteninja · March 2014

So I'm trying to just start practicing with FT3 by using Earth. So I DL'd the ETOPO1 data and after some Googling, got it to sort of take. I was wondering if someone could look at the settings I'm using to see why its coming out like it is.

.HDR file:
NCOLS 21600
NROWS 10800
XLLCORNER -180.000000
YLLCORNER -90.000000
CELLSIZE 0.01666666667
NODATA_VALUE -32768
BYTEORDER LSBFIRST
NUMBERTYPE 2_BYTE_INTEGER
ZUNITS METERS
MIN_VALUE -10803
MAX_VALUE 8333

Byteninja · March 2014

And yeah, I just noticed I put Bottom as 90. Fixed that and produced this map. This is just the upper left corner. The blue at the bottom extend an equal amount as the map on top. And using 4 byte, integer, doubles the map and doesn't really have any detail.

jslayton · March 2014

According to http://forum.profantasy.com/comments.php?DiscussionID=2534, you need an extra sample in width and height (21601 and 10801, respectively). Also, using the I2 data set means that the line width should be 21601*2=43202 bytes.

Byteninja · March 2014

Ok, that fixed the doubling and the huge blue swath at the bottom.

Any thoughts on how I can take the 45 degree lean out? And thank you. I was racking my brain trying to get that working.

jslayton · March 2014

The 45 degree lean should have gone away when you made your Width=21601. It's possible, though, that the true width of that particular data set (I only use the floating-point one, remember) is 21600 and the bytes per line is therefore 43200.

Byteninja · March 2014

That was the problem. Thank you again!

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Getting ETOPO1 to work with FT3

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