pkascii2img - Online in the Cloud

PROGRAM:

NAME

pkascii2img - program to create raster image based on ascii file

SYNOPSIS

pkascii2img [-i input] [-o output] [-ot type] [-of GDALformat] [-co NAME=VALUE] [-dx
value] [-dy value] [-ulx value] [-uly value] [-ct filename] [-a_srs
EPSG:number] [-d description]

DESCRIPTION

pkascii2img creates a raster dataset from an ASCII textfile. The textfile is in matrix
format (rows and columns). The dimensions in x and y are defined by the number of columns
and rows respectively. The georeferencing can be defined by providing the options for
cell size (-dx -dy), upper left position (-ulx -uly) and the projection (-a_srs). Some
dataset formats can also store a description (-d) and a color table (-ct).

OPTIONS

-i filename, --input filename
input ASCII file

-o filename, --output filename
Output image file

-ot type, --otype type
Data type for output image ({Byte / Int16 / UInt16 / UInt32 / Int32 / Float32 /
Float64 / CInt16 / CInt32 / CFloat32 / CFloat64}). Empty string: inherit type from
input image

-of GDALformat, --oformat GDALformat
Output image format (see also gdal_translate(1)). Empty string: inherit from input
image

-co NAME=VALUE, --co NAME=VALUE
Creation option for output file. Multiple options can be specified.

-ulx value, --ulx value
Upper left x value bounding box (in geocoordinates if georef is true)

-uly value, --uly value
Upper left y value bounding box (in geocoordinates if georef is true)

-dx value, --dx value
Output resolution in x (in meter)

-dy value, --dy value
Output resolution in y (in meter)

-ct filename, --ct filename
colour table in ASCII format having 5 columns: id R G B ALFA (0: transparent, 255:
solid)

-a_srs EPSG:number, --a_srs EPSG:number
Override the projection for the output file

-d description, --description description
Set image description

-v, --verbose
verbose

EXAMPLE

We create a 5x5 raster dataset containing all 0 values except for its center (value=1)

cat input.txt

0 0 0 0 0
0 0 0 0 0
0 0 1 0 0
0 0 0 0 0
0 0 0 0 0

We define a pixel size of 25 by 25 m and and a projected in the European projection system
ETS89/LAEA. The location of the upper left pixel is also set:

pkascii2img -i input.txt -o output.tif -of GTiff -a_srs epsg:3035 -dx 25 -dy 25 -ulx 1000000 -uly 1000000

We check the output GeoTIFF using gdalinfo:

gdalinfo output.tif

Driver: GTiff/GeoTIFF
Files: output.tif
Size is 5, 5
Coordinate System is:
PROJCS["ETRS89 / LAEA Europe",
GEOGCS["ETRS89",
DATUM["European_Terrestrial_Reference_System_1989",
SPHEROID["GRS 1980",6378137,298.2572221010042,
AUTHORITY["EPSG","7019"]],
TOWGS84[0,0,0,0,0,0,0],
AUTHORITY["EPSG","6258"]],
PRIMEM["Greenwich",0],
UNIT["degree",0.0174532925199433],
AUTHORITY["EPSG","4258"]],
PROJECTION["Lambert_Azimuthal_Equal_Area"],
PARAMETER["latitude_of_center",52],
PARAMETER["longitude_of_center",10],
PARAMETER["false_easting",4321000],
PARAMETER["false_northing",3210000],
UNIT["metre",1,
AUTHORITY["EPSG","9001"]],
AUTHORITY["EPSG","3035"]]
Origin = (1000000.000000000000000,1000000.000000000000000)
Pixel Size = (25.000000000000000,-25.000000000000000)
Metadata:
AREA_OR_POINT=Area
TIFFTAG_DATETIME=2014:11:08 11:33:52
TIFFTAG_DOCUMENTNAME=output.tif
TIFFTAG_SOFTWARE=pktools 2.5.4 by Pieter Kempeneers
Image Structure Metadata:
INTERLEAVE=BAND
Corner Coordinates:
Upper Left ( 1000000.000, 1000000.000) ( 23d13' 9.44"W, 25d30'21.01"N)
Lower Left ( 1000000.000, 999875.000) ( 23d13' 8.02"W, 25d30'17.24"N)
Upper Right ( 1000125.000, 1000000.000) ( 23d13' 5.27"W, 25d30'22.72"N)
Lower Right ( 1000125.000, 999875.000) ( 23d13' 3.85"W, 25d30'18.95"N)
Center ( 1000062.500, 999937.500) ( 23d13' 6.65"W, 25d30'19.98"N)
Band 1 Block=5x5 Type=Byte, ColorInterp=Gray
gdalinfo output.tif
Driver: GTiff/GeoTIFF
Files: output.tif
Size is 5, 5
Coordinate System is:
PROJCS["ETRS89 / LAEA Europe",
GEOGCS["ETRS89",
DATUM["European_Terrestrial_Reference_System_1989",
SPHEROID["GRS 1980",6378137,298.2572221010042,
AUTHORITY["EPSG","7019"]],
TOWGS84[0,0,0,0,0,0,0],
AUTHORITY["EPSG","6258"]],
PRIMEM["Greenwich",0],
UNIT["degree",0.0174532925199433],
AUTHORITY["EPSG","4258"]],
PROJECTION["Lambert_Azimuthal_Equal_Area"],
PARAMETER["latitude_of_center",52],
PARAMETER["longitude_of_center",10],
PARAMETER["false_easting",4321000],
PARAMETER["false_northing",3210000],
UNIT["metre",1,
AUTHORITY["EPSG","9001"]],
AUTHORITY["EPSG","3035"]]
Origin = (1000000.000000000000000,1000000.000000000000000)
Pixel Size = (25.000000000000000,-25.000000000000000)
Metadata:
AREA_OR_POINT=Area
TIFFTAG_DATETIME=2014:11:08 11:33:52
TIFFTAG_DOCUMENTNAME=output.tif
TIFFTAG_SOFTWARE=pktools 2.5.4 by Pieter Kempeneers
Image Structure Metadata:
INTERLEAVE=BAND
Corner Coordinates:
Upper Left ( 1000000.000, 1000000.000) ( 23d13' 9.44"W, 25d30'21.01"N)
Lower Left ( 1000000.000, 999875.000) ( 23d13' 8.02"W, 25d30'17.24"N)
Upper Right ( 1000125.000, 1000000.000) ( 23d13' 5.27"W, 25d30'22.72"N)
Lower Right ( 1000125.000, 999875.000) ( 23d13' 3.85"W, 25d30'18.95"N)
Center ( 1000062.500, 999937.500) ( 23d13' 6.65"W, 25d30'19.98"N)
Band 1 Block=5x5 Type=Byte, ColorInterp=Gray

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