On 16/08/16 19:56, William Hudspeth wrote:
Hello Nikos,
The link you provided documents how to use g.extension for installing
python scripts in GRASS 7.3. In particular, it uses the 'url=....'
argument to specify a link to a zip file. I am using the stable version
of GRASS 7.0 that is installed with Ubuntu 16.01. In that version, the
'url=...' argument is not available. Is there an alternative way to
install your extension in GRASS 7.0?
Download the extension to your machine, unzip it, go into the directory
and then run
make MODULE_TOPDIR=/path/to/your/grass/installation
You have to have the grass-dev package installed for it to work.
Moritz
Thanks much, William
On 08/13/2016 11:23 PM, Nikos Alexandris wrote:
William Hudspeth:
Hello,
Hello William,
I was wondering whether anyone has a workflow to pan sharpen Worldview-2
imagery (0.5 m pan, and 2.0 m MS) with 5 bands (panchromatic, red, blue,
green, NIR).
I am using grass 7.0.3 on ubuntu 16.01, but cannot find the
i.fusion.hbf command. I would also like information on any
pre-processing I might need to perform, such as converting digital
number to reflectance.
A simple workflow, would be to *first*, ortho-rectify your images
based on their own RPCs. You might want to read this à propos:
http://fwarmerdam.blogspot.ch/2013/09/exploring-rpcs.html
Next, you can create a Location based on the image's own reference
system, like:
grass70 -c WorldView2_Image.TIF /projects/grassdb/location_name
of course, you would (re-)name the above as it fits for you.
Now, inside GRASS,
1. import bands (pan and multispectral) in grass' data base using
`r.in.gdal` -- bands will
likely get a basename (the one given for `output=`, and a number as a
suffix if the number of bands is more than 3, I think).
2. optionally, rename for the imported multispectral bands their names
to easier
know which is which (like instead of ".1" , "blue" or whatsoever fits).
3. you may want to use
https://github.com/NikosAlexandris/i.worldview.toar to convert digital
numbers to radiance or reflectance. An example command:
i.worldview.toar
band=11APR03001446-M2AS_R1C1.Blue,11APR03001446-M2AS_R1C1.Green,11APR03001446-M2AS_R1C1.Red,11APR03001446-M2AS_R1C1.NIR
outputsuffix=Rad utc=2011-04-03T00:14:46.590888Z sea=44.1
4. Then you can use i.fusion.hpf to sharpen all multispectral bands in
one go like:
i.fusion.hpf pan=Panchromatic msx=msRed,msBlue,msGreen,msNIR
given, of course, the appropriate band names.
Any assistance is much appreciated...
Thanks
You might want to have a look at
https://grasswiki.osgeo.org/wiki/WorldView and assist in cleaning it up
and improving it.
Nikos
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