Re: st: using spmap and option "point"

[Maurizio Pisati <maurizio.pisati@unimib.it>]

Dear Ana,
your only chance is to add a variable that identifies regions to 
"file2.dta", and then use it in suboption -point()- to select only the 
stores located in regions B or C. To generate such variable, you might 
want to use a point-in-polygon algorithm -- an example of which, coded 
in Mata as function -sp_pips-, can be found in the -spgrid- Stata 
program (ssc install spgrid).
Best wishes,
Maurizio




Il 01/03/10 09.35, Vitorino, Maria Ana ha scritto:
> Dear statalist users,
>
> Is the following possible?
>
> I have 2 files:
>
> *file1 is something like:
>
> region populationsize  id
> A            ...                	  1
> B            ...              		  2
> C           ...               	  3
>
> (I also have a file with the region coordinates so that I can use spmap)
>
> *file 2 is something like:
>
> store_id  xcoord  ycoord
> 100          ...			...
> 201           ...		...
> 345          ...			...
> 411           ...		...
> 544          ...			...
>
>
>
> I would like to do a map with the stores superimposed on the map but only for the stores that are located in region B or C (note that I don't have that information on file2, otherwise it would be easy to do), excluding store 345 (irrespective of where it is located).
>
> If I do something like the following, the problem is that all the stores (even the ones that are not located in regions B or C) show up...and I only want the ones located in regions B or C.
>
> spmap populationsize if region=="B" | region=="C" using file1coord, id(id) point(data("file2.dta") xcoord(xcoord) ycoord(ycoord) fcolor(emerald) select(drop if store_id==345))
>
> How can I modify this command line to achieve what I'm looking for?
>
> Any help is appreciated.
> Thanks!
>
> Ana
>
>
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