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How to filter out almost dupicate X Y (Easting Northing) coordinates?

 
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Top Forums UNIX for Dummies Questions & Answers How to filter out almost dupicate X Y (Easting Northing) coordinates?
# 8  
Old 09-22-2010
Gentlemen,

I thank you very much for your efforts in try to helping me with this code.

As I said, note that I am working in a Microsoft Windows XP command prompt window environment. Not sure if that will have any effect on the syntax.

I put your code into a command text file.
I can't seem to get the code to work without errors when listed vertically, so
I had to put it all on one line, and then type.....
mawk -v range=5 -f awk_commands.txt FileIn.txt

But......

All it does is print the complete contents of the input file (plus that extra "secret" column) to the screen, and does not create the duplicate and unique files.

The other strange behaviour is that no matter what value I use for range, a negative number, 0, or 1000000, I get the same output:

PointNumber_0000001 1000000.123456 1000000.123456 10000.123456 1000001.75
PointNumber_0000010 1000001.234567 1000002.234567 10345.234567 1000001.75
PointNumber_0000100 1000010.345678 1000020.456789 10030.987654 1000012.75
PointNumber_0001000 1000050.345678 1000050.456789 10030.987654 1000051.25
PointNumber_0010000 1000123.123456 1000456.123456 10789.123456 1000125.50
PointNumber_0100000 1000123.123456 1000456.123456 10789.123456 1000125.50
PointNumber_1000000 1000000.123456 1000000.123456 10000.123456 1000001.75
PointNumber_2000000 1000011.345678 1000021.456789 10030.987654 1000012.75
PointNumber_3000000 1000051.000678 1000049.999000 10030.987654 1000051.25[/SIZE][/SIZE]
 
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LEARN ABOUT DEBIAN

gdal_contour

gdal_contour(1) 					      General Commands Manual						   gdal_contour(1)

NAME

       gdal_contour - gdal_contour builds vector contour lines from a raster elevation model

SYNOPSIS

       Usage: gdal_contour [-b <band>] [-a <attribute_name>] [-3d] [-inodata]
			   [-snodata n] [-f <formatname>] [-i <interval>]
			   [-off <offset>] [-fl <level> <level>...]
			   [-nln <outlayername>]
			   <src_filename> <dst_filename>

DESCRIPTION

       This program generates a vector contour file from the input raster elevation model (DEM).

       Starting from version 1.7 the contour line-strings will be oriented consistently. The high side will be on the right, i.e. a line string
       goes clockwise around a top.

       -b band:
	   picks a particular band to get the DEM from. Defaults to band 1.

       -a name:
	   provides a name for the attribute in which to put the elevation. If not provided no elevation attribute is attached.

       -3d:
	   Force production of 3D vectors instead of 2D. Includes elevation at every vertex.

       -inodata:
	   Ignore any nodata value implied in the dataset - treat all values as valid.

       -snodata value:
	   Input pixel value to treat as 'nodata'.

       -f format:
	   create output in a particular format, default is shapefiles.

       -i interval:
	   elevation interval between contours.

       -off offset:
	   Offset from zero relative to which to interpret intervals.

       -fl level:
	   Name one or more 'fixed levels' to extract.

       -nln outlayername:
	   Provide a name for the output vector layer. Defaults to 'contour'.

EXAMPLE

       This would create 10meter contours from the DEM data in dem.tif and produce a shapefile in contour.shp/shx/dbf with the contour elevations
       in the 'elev' attribute.

       gdal_contour -a elev dem.tif contour.shp -i 10.0

AUTHORS

       Frank Warmerdam warmerdam@pobox.com, Silke Reimer silke@intevation.de

GDAL
								  Tue Sep 18 2012						   gdal_contour(1)