Spatial Dataset Not Valid Base Map Yielding SPMAP Issue

[Maxence Morlet]

Hi all,

Below are spatial data for Switzerland, which I downloaded as shp and then converted to .dta:

shp2dta using "$data/ch_100km.shp", database(CHE.dta) coor(CHEcoor.dta) genid(_ID) replace

use "$data/ch_100km_shp.dta", clear

flag was coded to determine any duplicates, which have all been deleted:

bys _ID _X _Y: keep if _N==_n

g flag=cond(_ID[_n]==_ID[_n-1] & _X[_n]==_X[_n-1] & _Y[_n]==_Y[_n-1],1,0)

When I try to run the following,

spmap using CHE.dta, id(_ID) poly(data(CHE.dta) fcolor(red))

I get the error message "File CHE.dta is not a valid basemap dataset", which I really do not understand as in this dataset, it is the case that _ID uniquely identifies the polygons making up the base map.

I may have made a big mistake somewhere. Could someone let me know where I've gone wrong?

clear
input byte _ID double(_X _Y) float flag
 1 3900000 2500000 0
 1 3900000 2600000 0
 1 4000000 2500000 0
 1 4000000 2600000 0
 1       .       . 0
 2 4000000 2500000 0
 2 4000000 2600000 0
 2 4100000 2500000 0
 2 4100000 2600000 0
 2       .       . 0
 3 4000000 2600000 0
 3 4000000 2700000 0
 3 4100000 2600000 0
 3 4100000 2700000 0
 3       .       . 0
 4 4000000 2700000 0
 4 4000000 2800000 0
 4 4100000 2700000 0
 4 4100000 2800000 0
 4       .       . 0
 5 4100000 2500000 0
 5 4100000 2600000 0
 5 4200000 2500000 0
 5 4200000 2600000 0
 5       .       . 0
 6 4100000 2600000 0
 6 4100000 2700000 0
 6 4200000 2600000 0
 6 4200000 2700000 0
 6       .       . 0
 7 4100000 2700000 0
 7 4100000 2800000 0
 7 4200000 2700000 0
 7 4200000 2800000 0
 7       .       . 0
 8 4200000 2500000 0
 8 4200000 2600000 0
 8 4300000 2500000 0
 8 4300000 2600000 0
 8       .       . 0
 9 4200000 2600000 0
 9 4200000 2700000 0
 9 4300000 2600000 0
 9 4300000 2700000 0
 9       .       . 0
10 4200000 2700000 0
10 4200000 2800000 0
10 4300000 2700000 0
10 4300000 2800000 0
10       .       . 0
11 4300000 2500000 0
11 4300000 2600000 0
11 4400000 2500000 0
11 4400000 2600000 0
11       .       . 0
12 4300000 2600000 0
12 4300000 2700000 0
12 4400000 2600000 0
12 4400000 2700000 0
12       .       . 0
13 4300000 2700000 0
13 4300000 2800000 0
13 4400000 2700000 0
13 4400000 2800000 0
13       .       . 0

[Andrew Musau]

The shape file is what contains coordinates - in your case "CHEcoor.dta". So you want

spmap using CHEcoor.dta, ...

Don't interfere with the shape file in any kind of way.

[Maxence Morlet]

Thanks Andrew!