Re: [GRASS-user] Label vector map

Micha Silver Wed, 26 Aug 2015 04:37:19 -0700

On 08/26/2015 02:25 PM, henk witte wrote:

Well, this is embarrassing – I cannot open my own pack!

Yes I also had trouble with v.unpack. Same error. Maybe it's a bug.

I manually did unzip, and put the directory in place, as well as the sqlite.db file. (which defeats the purpose of v.pack!)

I created a new workspace with a default Cartesian projection but if I try to unpack I get

IOError: [Errno 2] No such file or directory: 'C:\\Users\\he

nkwitte.GROENHOLLAND\\Documents\\grassdata/test/henkwitte/.t

mp/unknown/8544.0\\PROJ_INFO'

I have tries also with using the current-location-projection option, but same error.

With regard to the labelling, you are telling me you can label KOPER_NAAM and STRAATNAAM but these should not be attributes in the vector file AllleKavels. The field I try to use in the label is kavel_nr. I have repacked the vector file, if there are other attributes in this file than that is strange as well (however, I did join this vector file to a new database with different attributes – can something go wrong there?)

The vector layer is called KavelsGemeente. How did you do the join?

Here are the columns available:

Thanks

Henkn

From: Micha Silver [mailto:[email protected]]
Sent: 26 August 2015 12:30
To: henk witte <[email protected]>
Cc: [email protected]
Subject: Re: [GRASS-user] Label vector map

I tried your vector pack file, and I have no problems displaying both KOPER_NAAM and STRAATNAAM columns as labels on the map display. (On linux, not Windows)
HTH,
Micha

On 25/08/2015 20:49, henk witte wrote:
Sorry, I am new to GRASS and still have to learn a lot of the basics. Still – great product that allows me to create maps that I need fairly easily!

I have now run v.pack to create the vector file.

I am not entirely familiar with the projections, as I imported most data from esri shapefiles and use X- and Y-coordinates in the Dutch RGD system (basically meters easting and northing) I did not worry to much about the projection (the region is small). If I run g.proj –p I get:

(Tue Aug 25 19:41:59 2015)

g.proj -p

XY location (unprojected)

(Tue Aug 25 19:41:59 2015) Command finished (0 sec)

Basically it tells me I am using an unprojected mapset.

Hope this helps!

Henk

From: Anna Petrášová [mailto:[email protected]]
Sent: 25 August 2015 18:37
To: henk witte <[email protected]>
Cc: [email protected]
Subject: Re: [GRASS-user] Label vector map

On Tue, Aug 25, 2015 at 2:51 AM, henk witte <[email protected]> wrote:

Dear Anna,

Thanks for your suggestions, I have tried the North Carolina dataset (using the NAME attribute of the counties as label) and this indeed works fine. I have also tried my original file, and there I still have problems.

The vector (polygon) files I wanted to label have been created from two separate source files (imported from esri shape files) that I have merged. During the merge I noted a number of problems with the polygons, although it now displays OK. After this I joined the vector file with a new attribute table. I can use that to color the polygons (create thematic maps) but I cannot label the polygons even if I use the grass-generated “cat”column.

I have tried not specifying a font at all (default) and then did specify a font to see if that would help. Unfortunately not.

I have added the vector file (directory) as a zip file to this email.

Could you please use v.pack to send us the vector, you can't just take the directory with the vector, the attribute data are stored separately and v.pack takes care of that. Also which projection are you working in? Could you send the EPSG? Thank you

Anna

Thanks for any further assistance!

Henk

From: Anna Petrášová [mailto:[email protected]]
Sent: 21 August 2015 17:58
To: henk witte <[email protected]>
Cc: [email protected]
Subject: Re: [GRASS-user] Label vector map

On Fri, Aug 21, 2015 at 5:24 AM, henk witte <[email protected]> wrote:

Dear grass-users,

I am trying to put labels in a polygon layer, but the rendering fails. The details are:

Problem signature:

Problem Event Name:                        APPCRASH

Application Name:                             d.vect.EXE

Application Version:                           7.0.0.0

Application Timestamp:                     55ae1991

Fault Module Name:                          libgrass_driver.7.0.1svn.dll

Fault Module Version:                        0.0.0.0

Fault Module Timestamp:                  55ae17e1

Exception Code:                                  c0000005

Exception Offset:                                00002aa5

OS Version:                                          6.1.7601.2.1.0.256.48

Locale ID:                                             2057

Additional Information 1:                  0a9e

Additional Information 2:                  0a9e372d3b4ad19135b953a78882e789

Additional Information 3:                  0a9e

Additional Information 4: 0a9e372d3b4ad19135b953a78882e789

The command I use (through the GUI) is:

d.vect --quiet map=AlleKavels@GoesShape attribute_column=Kavel_nr width=1 font=romans label_color=black

Any suggestions?

Perhaps if you could replicate the problem on North Carolina sample dataset or provide your vector file, it would help identify the problem. Does it happen with other vectors or attribute columns? Have you tried different font or not specify it at all?

Anna

Henk Witte

Groenholland Geo-energysystems

Valschermkade 26

1059CD Amsterdam

T: +31 (0)20 6159050

M: +31 (0)628176535

E: [email protected]

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