Downscaling raster maps - Revision history

Neteler at 00:56, 6 September 2014

2014-09-06T00:56:12Z

← Older revision		Revision as of 00:56, 6 September 2014
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	(so you may need to use e.g. {{cmd\|r.fillnulls}} first), and it also requires that you		(so you may need to use e.g. {{cmd\|r.fillnulls}} first), and it also requires that you
	can fit the entire raster in memory (so it isn't suitable for very high resolution data).		can fit the entire raster in memory (so it isn't suitable for very high resolution data).

			See also [[Interpolation]]

	[[Category: FAQ]]		[[Category: FAQ]]
	[[Category: Raster]]		[[Category: Raster]]

⚠️NikosA: Category: Raster

2013-02-05T15:55:01Z

Category: Raster

← Older revision		Revision as of 15:55, 5 February 2013
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	[[Category: FAQ]]		[[Category: FAQ]]
			[[Category: Raster]]

⚠️NikosA: Retouched

2013-02-05T15:54:31Z

Retouched

← Older revision		Revision as of 15:54, 5 February 2013
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	'''Q:''' ~~What is be the recommended way to downsample a raster map?~~		'''Question'''

	'''A:''' The "best" way is subjective, but the main options are		What is be the recommended way to downsample a raster map?
	r.resamp.interp, r.resamp.stats, r.resamp.rst, r.mfilter.fp, or any
			'''Answer'''

			The "best" way is subjective, but the main options are
			{{cmd\|r.resamp.interp}}, {{cmd\|r.resamp.stats}}, {{cmd\|r.resamp.rst}}, {{cmd\|r.mfilter.fp}}, or any
	combination of those.		combination of those.

	Another option is to use i.fft followed by i.ifft with a ~~mask~~ applied.		Another option is to use {{cmd\|i.fft}} followed by {{cmd\|i.ifft}} with a MASK applied.
	However, that requires that your raster contains no null cells (so you		However, that requires that your raster contains no null cells
	may need to use e.g. r.fillnulls first), and it also requires that you		(so you may need to use e.g. {{cmd\|r.fillnulls}} first), and it also requires that you
	can fit the entire raster in memory (so it isn't suitable for very		can fit the entire raster in memory (so it isn't suitable for very high resolution data).
	high resolution data).

	[[Category: FAQ]]		[[Category: FAQ]]

Neteler: new FAQ

2008-06-20T19:43:14Z

new FAQ

New page

'''Q:''' What is be the recommended way to downsample a raster map?

'''A:''' The "best" way is subjective, but the main options are
r.resamp.interp, r.resamp.stats, r.resamp.rst, r.mfilter.fp, or any
combination of those.

Another option is to use i.fft followed by i.ifft with a mask applied.
However, that requires that your raster contains no null cells (so you
may need to use e.g. r.fillnulls first), and it also requires that you
can fit the entire raster in memory (so it isn't suitable for very
high resolution data).

[[Category: FAQ]]