[GRASS-user] making fcell raster maps using climate data

[Thomas.Adams at noaa.gov]

Bulent,

Others will probably have different suggestions, but first you must get your data into GRASS. Both involve first using v.in.ascii to import (assuming you have latitude-longitude coordinates) the identifiers and locations (lat-long) into GRASS. Then you could, say, bring the climate data into a sqlite database and then connect your imported IDs and locations you previously imported into GRASS to the sqlite database.

Alternatinely, and probably easier is to use v.in.ascii with the station IDs, lat & long values and the 13 climate values for each station as attributes to the vector points. See the v.in.ascii documentation for examples.

The next step is to do the raster spatial interpolation from the vector point data — there are many ways to do this within GRASS, using something as simple as inverse distance weighting to splines with tension or to use R and gstat within GRASS and use kriging.

Regards,
Tom

----- Original Message -----
From: Bulent Arikan <bulent.arikan at gmail.com>
Date: Sunday, May 29, 2011 7:58 pm
Subject: [GRASS-user] making fcell raster maps using climate data
To: grass-user at lists.osgeo.org

> Dear List,
> 
> I have an Excel file that contains precipitation data in 13 columns (mean
> values for each month and annual average) from a region between certain
> years (in rows): eventually showing temporal changes in precipitation
> values. The data are taken at a weather station whose coordinates are 
> known.
> I want to use this file in order to make an fcell raster map in GRASS. 
> After
> some research I found few leads and mostly on interpolation of data.
> However, I am confused about the actual process turning the data in Excel
> into a raster map. I will greatly appreciate any suggestions as to which
> module to use and how to arrange the data.
> 
> Thank you,
> -- 
> BÜLENT
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