Problem with SPMAP Basemap

[Samuel Chang]

Hello!

I've been having a problem with SPMAP's basemap for quite a while now. It seems that, while using the same file for the basemap, the map is drawn differently for various datasets I put on top. I cannot figure out why one draws the complete basemap whereas the other only draws some of the provinces. I have attached my files, which are described as follows:

• graph2.dta - the data file for my first graph which does not draw the complete basemap
• graph3.dta - the data file for my second graph which does draw the complete basemap
• drc_coord.dta - the basemap file

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Code:

use graph2, clear
spmap using drc_coord.dta, id(vid) point(xcoord(longitude) ycoord(latitude) by(cert) fcolor(BuPu) size(small small) legenda(on))

use graph3, clear
spmap using drc_coord.dta, id(villageid) point(xcoord(longitude) ycoord(latitude) size(small small small small))

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Thanks!
Samuel

[Samuel Chang]

Hello again! Does anyone happen to have some insight about this problem? Thanks in advance for the help!

[Sebastian Schirner]

Hey Samuel,

it seems that there are not the same coordinates/villages in both datasets and that in the first one some villages are missing. Thus, the basemap is incomplete. The following code is a work-around but better carefully examine why some villages are missing in the first place.

* Use dataset 2
use graph2.dta, clear

* Merge with dataset 3 to have all possible villages
rename vid villageid
merge 1:1 villageid using graph3.dta

* Create the map
spmap using drc_coord.dta, id(villageid) point(xcoord(longitude) ycoord(latitude) by(cert) fcolor(BuPu) size(small small) legenda(on))

Best,
Sebastian

[Samuel Chang]

Hi Sebastian,

Thanks for getting back to me. However, I am aware that graph2 and graph3 have different coordinates. I was hoping to graph the two different sets of coordinates on the same basemap (DRC provinces). When I run it, I do get the correct data points, but somehow the DRC map in the background is complete for graph3, but is missing several provinces for graph2. I have pasted the two images below. The first one is graph2 and the second is graph3. Do you have any idea why this could be happening? Thanks again!

Best,
Samuel

[Samuel Chang]

Sorry, the images did not come through. Here are the images as attachments.