Re: st: spmap to plot only points?

[Thomas Speidel <thomas@tmbx.com>]

Thank you Maurizio. Very helpful the tip to create a dummy map.

Thomas

On 2013-09-04 0:27, Maurizio Pisati wrote:

> Dear Thomas,
> you have two basic option:
>
> 1. Without -spmap-: Plot the points using -graph twoway scatter-.
>
> 2. With -spmap-: You need to create a dummy basemap that contains all
> the points, and then proceed as usual. Here's an example using the 
> point
> dataset "Italy-Capitals.dta" distributed with -spmap-:
>
> . * Open the point dataset of interest
> . use "Italy-Capitals.dta", clear
>
> . * Find the min and max values of the x- and y-coordinates of the
> points
> . summarize xcoord ycoord
>
> Variable | Obs Mean Std. Dev. Min Max
>
> -------------+--------------------------------------------------------
> xcoord | 103 758654.8 226063.8 368761.1 1279167
> ycoord | 103 4761314 288410.5 4101939 5151970
>
> . * Create a basemap dataset representing the (approximate) minimum
> bounding
> . * box for your set of points
>
> . clear
> . input _ID _X _Y
>
> _ID _X _Y
> 1. 1 . .
> 2. 1 350000 4000000
> 3. 1 350000 5200000
> 4. 1 1300000 5200000
> 5. 1 1300000 4000000
> 6. end
>
> . sort _ID, stable
> . save "mbb.dta", replace
> file mbb.dta saved
>
> . * Create a temporary master dataset containing just one location
> . clear
> . input id
>
> id
> 1. 1
> 2. end
>
> . * Draw the map setting the basemap outline color to "none"
> . spmap using "mbb.dta", id(id) ocolor(none)
> point(data("Italy-Capitals.dta") x(xcoord) y(ycoord))
>
> Best wishes,
> Maurizio
>
> Il giorno 03/set/2013, alle ore 22.21, Thomas Speidel ha scritto:
>
> > I'm using spmap (user written addon by Maurizio Pisati - 1.2.0) to
> plot
> > location points by certain attributes. I'm wondering if it is
> possible,
> > either with spmap or other spatial addons, to plot the points 
> > without
> a
> > boundary region since I'm interested in the location of the points
> > relative to each other. I do have a boundary shapefile which I was
> able
> > to use. However, the boundary is too large compared to the distance
> > among the points, thus, it does not convey spatial distribution.
> Thanks
> > -- Thomas Speidel
>
> *
> * For searches and help try:
> * http://www.stata.com/help.cgi?search
> * http://www.stata.com/support/faqs/resources/statalist-faq/
> * http://www.ats.ucla.edu/stat/stata/

--
Thomas Speidel
*
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