On 16/03/17 12:36, Ang Sherpa wrote:
Hello users,
Is it possible to query according to coordinates and return the value of
desired column from attribute table as result.
v.what allows to query the map, however, could not figure out how to
choose the column in attribute table.
Eg. In a world shape file having "population" as one of its column in
attribute table.
when 25.36258,85.236554 is entered in coordinates then it should return
the population of that country in which the given coordinates belongs to.
Any help will be much appreciated.
It depends on the language in which you are working.
In a bash shell, using the NC demo dataset, here's how you can get the
name of a specific county which is in the NAME column of the attribute
table:
eval $(v.what -ga boundary_county coordinates=498364.930178,229163.426556)
echo $NAME
In python, you can use parse_command to get a dictionary of results:
result = gscript.parse_command('v.what', flags='ga',
map='boundary_county', coordinates=[498364.930178,229163.426556])
result['NAME']
Moritz
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