[GRASS-user] Pan sharpen Worldview-2 imagery
mlennert at club.worldonline.be
Wed Aug 17 04:33:24 PDT 2016
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
You have to have the grass-dev package installed for it to work.
> Thanks much, William
> On 08/13/2016 11:23 PM, Nikos Alexandris wrote:
>> William Hudspeth:
>> 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:
>> 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:
>> 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...
>> You might want to have a look at
>> https://grasswiki.osgeo.org/wiki/WorldView and assist in cleaning it up
>> and improving it.
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