[R] curvilinear grid
h.wickham at gmail.com
Thu Sep 27 05:55:54 CEST 2007
You might be able to do this with the ggplot2 package - see for
example http://had.co.nz/ggplot2/coord_map.html, which shows plots on
map coordinate systems. Because the design of ggplot2 means the
coordinate system and geom (eg. points vs tiles) operate
independently, you can draw image plots
(http://had.co.nz/ggplot2/geom_tile.html) in any coordinate system.
Can you provide more details about your curvilinear coordinate system?
On 9/26/07, Tom Sgouros <tomfool at as220.org> wrote:
> Hello all:
> A question from a new user. I have data on a geo-referenced curvilinear
> grid. This is a grid with 75 rows and 51 columns, is not aligned
> north-south, and the rows and columns are not straight. (And the
> coordinates are in meters.) I want to make image plots of this data,
> but where the grid is deformed according to the correct locations of the
> grid points, instead of coming out rectangular.
> I've found the sp package, which seems to be kind of close to what I'm
> after, but maybe I haven't figured out how to invoke it properly, or
> maybe there's another package I haven't found yet. Can anyone direct me
> to how to use R to map this kind of data? Is there an example someone
> might be able to share with me?
> Is there a collection of plots somewhere that someone might browse to
> answer questions like this?
> Many thanks,
> tomfool at as220 dot org
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