[R-sig-Geo] rasterQuad 4d object

[Agustin Lobo]

We have levels of increasing complexity:

First, the positioning
1. Location in 2D (x,y)
2. Location in surface 3D (x,y,z), but only 1 z for each x,y pair (the
common case in geography and remote sensing)
3. Location in full 3D (x,y,z), with a vector of z for each (x,y) pair
(the common case in geology, oceanography, some biomedical imaging)

Then the measured variable at each location.
U. Univariate (i.e., veetation index)
M. Multivariate (i.e. reflectance along wavelength)

And finally the time
S. Single observation
R. Repeated observations

Obviously package raster cannot deal with all combinations, the
developers made their options.

For sure raster deals well with
1US
1UR
1MS

The specific case of the 2U of a DEM is dealt with as a 1US

The problem is the rest. In the specific case I have mentioned, I would need
3US

I think Pascal refers to
2UR or 3UR

A lot more complicated...

Agus

On Tue, Jan 13, 2015 at 10:34 AM, Pascal Oettli <kridox at ymail.com> wrote:
> It might be interesting to have this class to deal with [longitude x
> latitude x level x time]-type NetCDF files. And thus to avoid loops.
>
> Regards,
> Pascal
>
> On Tue, Jan 13, 2015 at 12:18 AM, Michael Sumner <mdsumner at gmail.com> wrote:
>> No, not afaik. What is your use case? The ones I know are
>> Visualization -compelling, but hard to do well
>>
>> Extraction - i e copying data to points/ lines in 4d, easy but not easy to
>> pre-can.
>>
>> It comes down to specifics.
>>
>> Cheers, Mike
>>
>> On Mon, 12 Jan 2015 20:39 Agustin Lobo <alobolistas at gmail.com> wrote:
>>
>>> Back in Apr 09, 2013; 8:53am
>>> Robert Hijmans wrote:
>>> "A RasterBrick is 3D. There is a 4D object RasterQuad designed to work with
>>> the type of data you have, but I have not implemented any methods for it,
>>> so it is currently of no use.../..."
>>>
>>> Has any further development been conducted on this RasterQuad object?
>>>
>>> Thanks
>>>
>>> Agus
>>>
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