[GRASS-dev] Update of r.surf.idw to FP

[Paul Kelly]

On Tue, 20 Mar 2007, Markus Neteler wrote:

> On Tue, Mar 20, 2007 at 06:24:09PM +0000, Glynn Clements wrote:
>>
>> Markus Neteler wrote:
>>
>>> I have tried to update r.surf.idw to floating point:
>>> http://mpa.itc.it/markus/tmp/rsurfidw.diff
>>>
>>> but I am not quite sure if this is efficient like this.
>>> Currently it doesn't compile due to some "extern" magic
>>> which I don't quite understand.
>>> I have been inspired by r.example.
>>
>> The problem is that you have renamed some (but not all) occurrences of
>> "cell" to "outrast", although the variable is still called "cell".
>
> I see.
> Thinking about it again: probably it is a waste of time.
>
> Proposal:
> - write a script to emulate r.surf.idw[2], calling
>   - r.to.vect
>   - v.surf.idw
> - retire r.surf.idw and r.surf.idw2, substitute them by this script.
>
> Since both r.surf.idw and r.surf.idw2 are half broken (r.surf.idw2 more
> than the other) and v.surf.idw works, this might be the least cost path
> for maintenance.

>From reading the manpage, it looks like r.surf.idw has some features that 
aren't present in v.surf.idw. E.g. correct calculation of distances in 
lat/long locations, error output. However r.surf.idw2 doesn't look very 
useful. It seems that the functionality of r.surf.idw2 would be better 
kept as a command-line option for r.surf.idw. Perhaps the author of 
r.surf.idw had in mind that this improved version would replace 
r.surf.idw2, but the GRASS developers at the time were hesitant and kept 
it on in case anybody needed it?

Paul