[GRASS-user] Using i.rectify and data type

[Markus Metz]

António Rocha:
> Hello Markus
> Are you sure? Because I have tried i.rectify (1st order, 2nd order and 3rd
> Order) with a CELL image and my output was also CELL.

Yes. The order (1st, 2nd, or 3rd) affects only coordinate
transformation. The resampling method determines how the new cell
value is calculated. This is the difference between the option order
and the option method. BTW, the option method has been introduced only
relatively recently, i.e. is not available in 6.4.1, I think, only
6.4.2.

> Markus Metz wrote:
>>
>> 2011/7/21 António Rocha <antonio.rocha at deimos.com.pt>:
>>
>>>
>>> Greetings
>>>
>>> I have one question regarding i.rectify's data type output: If I have my
>>> input is a CELL map, will my output will be also CELL? I mean, does it
>>> keep
>>> my data type?
>>>
>>
>> That depends on the resampling method. Only nearest neighbor preserves
>> the datatype, with all other resampling methods the output will be
>> DCELL. This is similar to r.proj, only that r.proj uses FCELL for
>> resampling methods other than nearest neighbor.
>>
>>
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>
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