IMPORTANT: this package is obsolete. Pixel functions provided by this package have been merged into GDAL.
A gdal plugin that provides a small set of "pixel functions" (see http://www.gdal.org/gdal_vrttut.html) that can be used to create derived raster bands.
The package provides:
- the implementation of a set of GDALDerivedPixelFunc(s) to be used with source raster band of virtual GDAL datasets
- a fake GDAL driver to register pixel functions
Note
using the plugin mechanism is a hack aimed to enable python users to use pixel functions without C++ coding
| "real": | extract real part from a single raster band (just a copy if the input is non-complex) |
|---|---|
| "imag": | extract imaginary part from a single raster band (0 for non-complex) |
| "complex": | make a complex band merging two bands used as real and imag values |
| "mod": | extract module from a single raster band (real or complex) |
| "phase": | extract phase from a single raster band (0 for non-complex) |
| "conj": | computes the complex conjugate of a single raster band (just a copy if the input is non-complex) |
| "sum": | sum 2 or more raster bands |
| "diff": | computes the difference between 2 raster bands (b1 - b2) |
| "mul": | multilpy 2 or more raster bands |
| "cmul": | multiply the first band for the complex conjugate of the second |
| "inv": | inverse (1./x). Note: no check is performed on zero division |
| "intensity": | computes the intensity Re(x*conj(x)) of a single raster band (real or complex) |
| "sqrt": | perform the square root of a single raster band (real only) |
| "log10": | compute the logarithm (base 10) of the abs of a single raster band (real or complex): log10( abs( x ) ) |
| "dB2amp": | perform scale conversion from logarithmic to linear (amplitude) (i.e. 10 ^ ( x / 20 ) ) of a single raster band (real only) |
| "dB2pow": | perform scale conversion from logarithmic to linear (power) (i.e. 10 ^ ( x / 10 ) ) of a single raster band (real only) |
The project home page is at https://github.com/avalentino/gdal-pixfun-plugin. A copy of the latest version of the sources can be obtained ising git:
$ git clone https://github.com/avalentino/gdal-pixfun-plugin.git
The gdal-pixfun-plugin can be built using the following command:
$ make
in the root folder of the source distribution. It assumes that GDAL is correctly installed on your system.
To run the unit test suite:
$ make check
To install the plugin just copy the generated shared object (gdal_PIXFUN.so) into the GDAL plugin directory (/usr/lib/gdalplugins/1.XX/ on unix).
The plugin can also be used without installing it. The user just needs to set the GDAL_DRIVER_PATH environment variable:
export GDAL_DRIVER_PATH=<PATH_TO_GDAL_PIXFUN_SO>:$GDAL_DRIVER_PATH
See the LICENSE.txt file.