Xyz2kdt

Popinet — Fri, 24 May 2013 04:53:48 GMT

/* Example 1: building a global terrain topography database using the ETOPO2 dataset */ updated header

Revision as of 04:53, 24 May 2013		Current revision
Line 36:		Line 36:

	% cat ETOPO2v2c_i2_LSB.hdr		% cat ETOPO2v2c_i2_LSB.hdr
		+
	NCOLS 10800		NCOLS 10800
	NROWS 5400		NROWS 5400
	XLLCORNER -180.000000		XLLCORNER -180.000000
	YLLCORNER -90.000000		YLLCORNER -90.000000
-	CELLSIZE 0.0333333333333333333	+	CELLSIZE 0.03333333333
-	NODATA_VALUE 999999	+	NODATA_VALUE -32768
	BYTEORDER LSBFIRST		BYTEORDER LSBFIRST
-	NUMBERTYPE 4_BYTE_FLOAT	+	NUMBERTYPE 2_BYTE_INTEGER
-	MIN_VALUE -10791.0	+	MIN_VALUE -10791
-	MAX_VALUE 8440.0	+	MAX_VALUE 8440

	We need to convert this binary file to a text file. We also want to use the database together with a cartographic projection defined using the [[Object_hierarchy#Map_module\|Map module]]. By definition this means that our ''x''-, ''y''- and ''z''-coordinates need to be the east-positive longitude, north-positive latitude and elevation in metres. We can easily get these coordinates in a text format suitable for input into <code>xyz2kdt</code> using the following C code:		We need to convert this binary file to a text file. We also want to use the database together with a cartographic projection defined using the [[Object_hierarchy#Map_module\|Map module]]. By definition this means that our ''x''-, ''y''- and ''z''-coordinates need to be the east-positive longitude, north-positive latitude and elevation in metres. We can easily get these coordinates in a text format suitable for input into <code>xyz2kdt</code> using the following C code:
Line 60:		Line 61:
	#define XLLCORNER -180.000000		#define XLLCORNER -180.000000
	#define YLLCORNER -90.000000		#define YLLCORNER -90.000000
-	#define CELLSIZE 0.0333333333333333333	+	#define CELLSIZE 0.03333333333
-	#define NODATA_VALUE 999999	+	#define NODATA_VALUE -32768
	#define BYTEORDER LSBFIRST		#define BYTEORDER LSBFIRST
-	#define NUMBERTYPE 4_BYTE_FLOAT	+	#define NUMBERTYPE 2_BYTE_INTEGER
-	#define MIN_VALUE -10791.0	+	#define MIN_VALUE -10791
-	#define MAX_VALUE 8440.0	+	#define MAX_VALUE 8440

	int main (int argc, char * argv[])		int main (int argc, char * argv[])

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Xyz2kdt