[GRASS-user] How to force remove broken vector layers?

Allar Haav allar.haav at gmail.com
Tue Apr 9 08:20:45 PDT 2013

Hi, and thanks for answering.
Well, it seems that I've been so preoccupied with my current acticity 
that I missed the real issue which is apparently much wider and weirder. 
So, indeed, nothing to do with database tables and r.drain.
Apparently, deleting any vector layer gives me the error when using 
g.remove. I tried creating a new location and mapset, but ran into the 
same problem. When removing a vector layer the hist, sidx and topo files 
aren't deleted. I figured it could have something to do with user rights 
and ran the same operation as an admin, but to no avail. No such issue 
with GRASS 6 though.
The GRASS 7 I'm running currently however is a week-old r55595-540 as 
the later ones have been giving the error regarding pygrass and g.region 
at startup. Could this be the key to my issue?


On 09/04/2013 15:01, Markus Metz wrote:
> On Tue, Apr 9, 2013 at 3:21 PM, Allar Haav <allar.haav at gmail.com> wrote:
>> Hi,
>> Several modules (for example, r.drain) produce vector layers that are to
>> some extent broken, at least in WinGRASS 7. Most probably something to do
>> with database connections as these seem to be missing for them.
> Database connections are optional for vector maps. Why do you think
> the vector map created by r.drain is broken? What do v.info and
> v.category op=report say? The vector map created by r.drain does not
> have a database connection, thus also no attribute table. You can add
> a table with v.db.addtable if you want to upload some attributes.
>> Anyway, I
>> still need to use the output files and I've been creating db tables for them
>> manually. While they are usable after that, it is nevertheless impossible to
>> get rid of them afterwards. Using g.remove, the sample command output is as
>> follows:
>> Removing vector <vectpath at PERMANENT>
>> WARNING: Unable to delete file
>> 'C:\GIS\GRASS/Kuigatsi/PERMANENT/vector/vectpath/hist'
>> WARNING: Unable to delete vector map
>> WARNING: <vectpath> nothing removed
>> (Tue Apr 09 13:58:29 2013) Command finished (0 sec)
> How exactly did you create db tables? The commands you used are needed
> to reproduce and fix the problem.
> Markus M
>> So far the only way of removing those layers is just deleting their actual
>> files, but this isn't a good workaround as I'm trying to use it in a Python
>> script. Is there any better way to force the removal of those layers?
>> Regards,
>> Allar
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