Re: [Qgis-user] Creating Geometries for tabular data

[Martin Bain]

I just had a chance to install master and try out the geometry type override, 
nice.  I see "GeometryCollection" is an option - have I been mistaken in 
thinking QGIS can't work with GeometryCollections?

The "force multi-type" option is a nice feature too - I'm currently struggling 
with a similar issue.
Regards,
Martin.

-Original Message-
From: Qgis-user [mailto:qgis-user-boun...@lists.osgeo.org] On Behalf Of Nyall 
Dawson
Sent: Tuesday, 24 November 2015 7:32 AM
To: Matthias Kuhn
Cc: qgis-user@lists.osgeo.org
Subject: Re: [Qgis-user] Creating Geometries for tabular data

On 17 November 2015 at 06:59, Matthias Kuhn <matth...@opengis.ch> wrote:
> I use the process on a postgis DB, but Shapefiles are also capable of 
> having tabular data without geometries attached.
> However I do not know how you would create such a file (easily) from 
> an existing geometry-less layer.
>
> Maybe something like this:
> http://gis.stackexchange.com/questions/327/how-can-i-convert-an-excel-
> file-with-x-y-columns-to-a-shapefile
>
> Or try with adding a dummy geometry column in a csv so it loads as 
> points and then save as shapefile.

Ok, with improvements that just landed in QGIS master (see [1]) this is now 
MUCH easier. Now, you can right click the geometryless table in the legend and 
select "Save as". In the save vector layer dialog there's a new option to 
override the geometry type for the saved file.
So you can choose to save the geometryless table with a Point/Line/Polygon 
geometry, which will obviously all initially be empty. Then, you can select 
features from the attribute table and use the "add part" tool to attach 
geometries to these records.

The new option also lets you force the saved file to be multipart, which is 
also useful in some circumstances.

Nyall

[1] https://github.com/qgis/QGIS/commit/ffebfd9bb719daf1ffa9bf7dde68c6e5892dcb89

>
> Best,
> Matthias
>
>
> On 11/16/2015 03:00 PM, DelazJ wrote:
>
> Hi,
> Matthias, what kind of format can this file be?
> This is not the first time I see MapInfo user asking about this 
> feature. I personnaly had last week to add geometries to features that 
> were in a tabular file (csv) and couldn't find how to do this except 
> giving an unique ID to the table data, and in another shapefile 
> digitizing, filling ID after each drawing and, at the end joining 
> layers. It was possible because there was not so many features but it's 
> unfriendly.
> I thought I could save the csv into shapefile (even empty)  and 
> proceed with the "add part" tool but "saving as" failed.
> It would be nice if we could find a way to address this "issue"...
>
> 2015-11-16 7:22 GMT+01:00 Matthias Kuhn <matth...@opengis.ch>:
>>
>> Hi,
>>
>> IIRC you can use the "add part" tool to create geometries for 
>> existing objects. Just use the attribute table to select the proper 
>> object and then digitize with the add part tool. Of course the 
>> selected layer has to be capable of saving geomtries in the format 
>> you like (i.e. you cannot geometrizise an excel table).
>>
>> Cheers,
>> Matthias
>> ___
>> Qgis-user mailing list
>> Qgis-user@lists.osgeo.org
>> List info: http://lists.osgeo.org/mailman/listinfo/qgis-user
>> Unsubscribe: http://lists.osgeo.org/mailman/listinfo/qgis-user
>
>
>
> --
> Matthias Kuhn
> OPENGIS.ch - https://www.opengis.ch
> Spatial • (Q)GIS • PostGIS • Open Source
>
>
> ___
> Qgis-user mailing list
> Qgis-user@lists.osgeo.org
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Re: [Qgis-user] Creating Geometries for tabular data

[Nyall Dawson]

On 17 November 2015 at 06:59, Matthias Kuhn  wrote:
> I use the process on a postgis DB, but Shapefiles are also capable of having
> tabular data without geometries attached.
> However I do not know how you would create such a file (easily) from an
> existing geometry-less layer.
>
> Maybe something like this:
> http://gis.stackexchange.com/questions/327/how-can-i-convert-an-excel-file-with-x-y-columns-to-a-shapefile
>
> Or try with adding a dummy geometry column in a csv so it loads as points
> and then save as shapefile.

Ok, with improvements that just landed in QGIS master (see [1]) this
is now MUCH easier. Now, you can right click the geometryless table in
the legend and select "Save as". In the save vector layer dialog
there's a new option to override the geometry type for the saved file.
So you can choose to save the geometryless table with a
Point/Line/Polygon geometry, which will obviously all initially be
empty. Then, you can select features from the attribute table and use
the "add part" tool to attach geometries to these records.

The new option also lets you force the saved file to be multipart,
which is also useful in some circumstances.

Nyall

[1] https://github.com/qgis/QGIS/commit/ffebfd9bb719daf1ffa9bf7dde68c6e5892dcb89

>
> Best,
> Matthias
>
>
> On 11/16/2015 03:00 PM, DelazJ wrote:
>
> Hi,
> Matthias, what kind of format can this file be?
> This is not the first time I see MapInfo user asking about this feature. I
> personnaly had last week to add geometries to features that were in a
> tabular file (csv) and couldn't find how to do this except giving an unique
> ID to the table data, and in another shapefile digitizing, filling ID after
> each drawing and, at the end joining layers. It was possible because there
> was not so many features but it's unfriendly.
> I thought I could save the csv into shapefile (even empty)  and proceed with
> the "add part" tool but "saving as" failed.
> It would be nice if we could find a way to address this "issue"...
>
> 2015-11-16 7:22 GMT+01:00 Matthias Kuhn :
>>
>> Hi,
>>
>> IIRC you can use the "add part" tool to create geometries for existing
>> objects. Just use the attribute table to select the proper object and
>> then digitize with the add part tool. Of course the selected layer has
>> to be capable of saving geomtries in the format you like (i.e. you
>> cannot geometrizise an excel table).
>>
>> Cheers,
>> Matthias
>> ___
>> Qgis-user mailing list
>> Qgis-user@lists.osgeo.org
>> List info: http://lists.osgeo.org/mailman/listinfo/qgis-user
>> Unsubscribe: http://lists.osgeo.org/mailman/listinfo/qgis-user
>
>
>
> --
> Matthias Kuhn
> OPENGIS.ch - https://www.opengis.ch
> Spatial • (Q)GIS • PostGIS • Open Source
>
>
> ___
> Qgis-user mailing list
> Qgis-user@lists.osgeo.org
> List info: http://lists.osgeo.org/mailman/listinfo/qgis-user
> Unsubscribe: http://lists.osgeo.org/mailman/listinfo/qgis-user
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Re: [Qgis-user] Creating Geometries for tabular data

[Martin Bain]

Very nice work Nyall!

Thank you very much,
Martin.

-Original Message-
From: Qgis-user [mailto:qgis-user-boun...@lists.osgeo.org] On Behalf Of Nyall 
Dawson
Sent: Tuesday, 24 November 2015 7:32 AM
To: Matthias Kuhn
Cc: qgis-user@lists.osgeo.org
Subject: Re: [Qgis-user] Creating Geometries for tabular data

On 17 November 2015 at 06:59, Matthias Kuhn <matth...@opengis.ch> wrote:
> I use the process on a postgis DB, but Shapefiles are also capable of 
> having tabular data without geometries attached.
> However I do not know how you would create such a file (easily) from 
> an existing geometry-less layer.
>
> Maybe something like this:
> http://gis.stackexchange.com/questions/327/how-can-i-convert-an-excel-
> file-with-x-y-columns-to-a-shapefile
>
> Or try with adding a dummy geometry column in a csv so it loads as 
> points and then save as shapefile.

Ok, with improvements that just landed in QGIS master (see [1]) this is now 
MUCH easier. Now, you can right click the geometryless table in the legend and 
select "Save as". In the save vector layer dialog there's a new option to 
override the geometry type for the saved file.
So you can choose to save the geometryless table with a Point/Line/Polygon 
geometry, which will obviously all initially be empty. Then, you can select 
features from the attribute table and use the "add part" tool to attach 
geometries to these records.

The new option also lets you force the saved file to be multipart, which is 
also useful in some circumstances.

Nyall

[1] https://github.com/qgis/QGIS/commit/ffebfd9bb719daf1ffa9bf7dde68c6e5892dcb89

>
> Best,
> Matthias
>
>
> On 11/16/2015 03:00 PM, DelazJ wrote:
>
> Hi,
> Matthias, what kind of format can this file be?
> This is not the first time I see MapInfo user asking about this 
> feature. I personnaly had last week to add geometries to features that 
> were in a tabular file (csv) and couldn't find how to do this except 
> giving an unique ID to the table data, and in another shapefile 
> digitizing, filling ID after each drawing and, at the end joining 
> layers. It was possible because there was not so many features but it's 
> unfriendly.
> I thought I could save the csv into shapefile (even empty)  and 
> proceed with the "add part" tool but "saving as" failed.
> It would be nice if we could find a way to address this "issue"...
>
> 2015-11-16 7:22 GMT+01:00 Matthias Kuhn <matth...@opengis.ch>:
>>
>> Hi,
>>
>> IIRC you can use the "add part" tool to create geometries for 
>> existing objects. Just use the attribute table to select the proper 
>> object and then digitize with the add part tool. Of course the 
>> selected layer has to be capable of saving geomtries in the format 
>> you like (i.e. you cannot geometrizise an excel table).
>>
>> Cheers,
>> Matthias
>> ___
>> Qgis-user mailing list
>> Qgis-user@lists.osgeo.org
>> List info: http://lists.osgeo.org/mailman/listinfo/qgis-user
>> Unsubscribe: http://lists.osgeo.org/mailman/listinfo/qgis-user
>
>
>
> --
> Matthias Kuhn
> OPENGIS.ch - https://www.opengis.ch
> Spatial • (Q)GIS • PostGIS • Open Source
>
>
> ___
> Qgis-user mailing list
> Qgis-user@lists.osgeo.org
> List info: http://lists.osgeo.org/mailman/listinfo/qgis-user
> Unsubscribe: http://lists.osgeo.org/mailman/listinfo/qgis-user
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Re: [Qgis-user] Creating Geometries for tabular data

[DelazJ]

Hi,
Matthias, what kind of format can this file be?
This is not the first time I see MapInfo user asking about this feature. I
personnaly had last week to add geometries to features that were in a
tabular file (csv) and couldn't find how to do this except giving an unique
ID to the table data, and in another shapefile digitizing, filling ID after
each drawing and, at the end joining layers. It was possible because there
was not so many features but it's unfriendly.
I thought I could save the csv into shapefile (even empty)  and proceed
with the "add part" tool but "saving as" failed.
It would be nice if we could find a way to address this "issue"...

2015-11-16 7:22 GMT+01:00 Matthias Kuhn :

> Hi,
>
> IIRC you can use the "add part" tool to create geometries for existing
> objects. Just use the attribute table to select the proper object and
> then digitize with the add part tool. Of course the selected layer has
> to be capable of saving geomtries in the format you like (i.e. you
> cannot geometrizise an excel table).
>
> Cheers,
> Matthias
> ___
> Qgis-user mailing list
> Qgis-user@lists.osgeo.org
> List info: http://lists.osgeo.org/mailman/listinfo/qgis-user
> Unsubscribe: http://lists.osgeo.org/mailman/listinfo/qgis-user
>
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Re: [Qgis-user] Creating Geometries for tabular data

[Martin Bain]

I had a bit of play with this last night and came up with this script:

layer = iface.activeLayer()  #active layer should be your CSV file
newname = layer.name() + '_Map'
otype = "Point"  # could be "Polygon" or "LineString"
resultlayer = QgsVectorLayer(otype, newname, "memory")
resultlayer.startEditing()
dp=resultlayer.dataProvider()
dp.addAttributes(list(layer.dataProvider().fields()))
resultlayer.updateFields()
dp.addFeatures(list(layer.dataProvider().getFeatures()))
QgsMapLayerRegistry.instance().addMapLayer(resultlayer)

You can paste the script into the python console editor

If you open a CSV file with no geometry and run the script it will create a 
copy of the CSV in a Memory layer with the specified object type (Point, 
LineString or Polygon)

You can then select individual rows in the attribute table and use the “Add 
Part” tool to digitise them.

From: Qgis-user [mailto:qgis-user-boun...@lists.osgeo.org] On Behalf Of 
Matthias Kuhn
Sent: Tuesday, 17 November 2015 6:59 AM
To: DelazJ
Cc: qgis-user@lists.osgeo.org
Subject: Re: [Qgis-user] Creating Geometries for tabular data

I use the process on a postgis DB, but Shapefiles are also capable of having 
tabular data without geometries attached.
However I do not know how you would create such a file (easily) from an 
existing geometry-less layer.

Maybe something like this:
http://gis.stackexchange.com/questions/327/how-can-i-convert-an-excel-file-with-x-y-columns-to-a-shapefile

Or try with adding a dummy geometry column in a csv so it loads as points and 
then save as shapefile.

Best,
Matthias
On 11/16/2015 03:00 PM, DelazJ wrote:
Hi,
Matthias, what kind of format can this file be?
This is not the first time I see MapInfo user asking about this feature. I 
personnaly had last week to add geometries to features that were in a tabular 
file (csv) and couldn't find how to do this except giving an unique ID to the 
table data, and in another shapefile digitizing, filling ID after each drawing 
and, at the end joining layers. It was possible because there was not so many 
features but it's unfriendly.
I thought I could save the csv into shapefile (even empty)  and proceed with 
the "add part" tool but "saving as" failed.
It would be nice if we could find a way to address this "issue"...

2015-11-16 7:22 GMT+01:00 Matthias Kuhn 
<matth...@opengis.ch<mailto:matth...@opengis.ch>>:
Hi,

IIRC you can use the "add part" tool to create geometries for existing
objects. Just use the attribute table to select the proper object and
then digitize with the add part tool. Of course the selected layer has
to be capable of saving geomtries in the format you like (i.e. you
cannot geometrizise an excel table).

Cheers,
Matthias
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--

Matthias Kuhn

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Spatial • (Q)GIS • PostGIS • Open Source

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Re: [Qgis-user] Creating Geometries for tabular data

[Matthias Kuhn]

I use the process on a postgis DB, but Shapefiles are also capable of
having tabular data without geometries attached.
However I do not know how you would create such a file (easily) from an
existing geometry-less layer.

Maybe something like this:
http://gis.stackexchange.com/questions/327/how-can-i-convert-an-excel-file-with-x-y-columns-to-a-shapefile

Or try with adding a dummy geometry column in a csv so it loads as
points and then save as shapefile.

Best,
Matthias

On 11/16/2015 03:00 PM, DelazJ wrote:
> Hi,
> Matthias, what kind of format can this file be?
> This is not the first time I see MapInfo user asking about this
> feature. I personnaly had last week to add geometries to features that
> were in a tabular file (csv) and couldn't find how to do this except
> giving an unique ID to the table data, and in another shapefile
> digitizing, filling ID after each drawing and, at the end joining
> layers. It was possible because there was not so many features but
> it's unfriendly.
> I thought I could save the csv into shapefile (even empty)  and
> proceed with the "add part" tool but "saving as" failed.
> It would be nice if we could find a way to address this "issue"...
>
> 2015-11-16 7:22 GMT+01:00 Matthias Kuhn  >:
>
> Hi,
>
> IIRC you can use the "add part" tool to create geometries for existing
> objects. Just use the attribute table to select the proper object and
> then digitize with the add part tool. Of course the selected layer has
> to be capable of saving geomtries in the format you like (i.e. you
> cannot geometrizise an excel table).
>
> Cheers,
> Matthias
> ___
> Qgis-user mailing list
> Qgis-user@lists.osgeo.org 
> List info: http://lists.osgeo.org/mailman/listinfo/qgis-user
> Unsubscribe: http://lists.osgeo.org/mailman/listinfo/qgis-user
>
>

-- 
Matthias Kuhn
OPENGIS.ch - https://www.opengis.ch
Spatial • (Q)GIS • PostGIS • Open Source

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Re: [Qgis-user] Creating Geometries for tabular data

[Randal Hale]

Probably the easiest way to do this would be a join - so if you made me 
do this I would do:


1. Create a layer (say a shapefile) with a point and a unique ID.
2. Make sure that Unique ID is reflected in your tabular data (point 1 
has a corresponding '1' in the tabular data or a point of "Water Park" 
has a "Water Park" in your table)
3. Right click on your shapefile with the points (or polygons) and go to 
properties -> Joins. Pick your two fields that are the same - and join 
them.


After a successful join right click and "save as" and make a new 
shapefile/Spatialite layer with all of your attributes.


Randy



Randal Hale
North River Geographic Systems, Inc
http://www.northrivergeographic.com
423.653.3611 rjh...@northrivergeographic.com
twitter:rjhale http://about.me/rjhale
http://www.northrivergeographic.com/introduction-to-quantum-gis

On 11/15/2015 06:22 PM, Martin Bain wrote:


Hi,

I’m after your suggestions for the best work flow for adding spatial 
data to existing tabular data.


Say we have a tabular list of playground equipment – I want to 
associate a point object with each row in the list – so I end up with 
spatial and attribute data in the one table.


I used to do this in MapInfo, you could open a table of purely tabular 
data, select a row in the attribute table, adding a point in the map 
window would create a map object for the selected row (rather than 
adding a whole new row to the table).  I don’t think I can do it like 
that with QGIS – am I right in thinking if there is no geometry for a 
row it will be excluded from the attribute table?


How do people do this in QGIS?

Thanks,

Martin.


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you must not reproduce or distribute any part of this email, disclose 
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[Qgis-user] Creating Geometries for tabular data

[Martin Bain]

Hi,
I'm after your suggestions for the best work flow for adding spatial data to 
existing tabular data.
Say we have a tabular list of playground equipment - I want to associate a 
point object with each row in the list - so I end up with spatial and attribute 
data in the one table.

I used to do this in MapInfo, you could open a table of purely tabular data, 
select a row in the attribute table, adding a point in the map window would 
create a map object for the selected row (rather than adding a whole new row to 
the table).  I don't think I can do it like that with QGIS - am I right in 
thinking if there is no geometry for a row it will be excluded from the 
attribute table?

How do people do this in QGIS?

Thanks,
Martin.

This email is intended for the named recipient only.  The information it 
contains may be confidential.  If you are not the intended recipient you must 
not reproduce or distribute any part of this email, disclose its contents to 
any other party or take any action in reliance on it.  If you have received 
this email in error, please contact the sender immediately and delete the 
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Re: [Qgis-user] Creating Geometries for tabular data

[Mats Elfström]

Hi!
Martin is right. This is a piece of cake in MapInfo and a very useful work
flow. The suggested method requires that you look up the object in the
table and then copy its uid to the created object. This is an unefficient
method.
I have recently struggled to do the same in ArcGIS which proved to be just
as inadequate as QGIS in this respect.
MapInfo can create a spatial table without geometries, that is the
difference.

Hälsning / Regards
Mats.E

Skickat från min / Sent from my iPhone, Ursäkta att jag är kortfattad /
Excuse my brevity.

16 nov 2015 kl. 00:36 skrev Randal Hale :

Probably the easiest way to do this would be a join - so if you made me do
this I would do:

1. Create a layer (say a shapefile) with a point and a unique ID.
2. Make sure that Unique ID is reflected in your tabular data (point 1 has
a corresponding '1' in the tabular data or a point of "Water Park" has a
"Water Park" in your table)
3. Right click on your shapefile with the points (or polygons) and go to
properties -> Joins. Pick your two fields that are the same - and join
them.

After a successful join right click and "save as" and make a new
shapefile/Spatialite layer with all of your attributes.

Randy



Randal Hale
North River Geographic Systems, Inchttp://www.northrivergeographic.com
423.653.3611 rjh...@northrivergeographic.com
twitter:rjhale
http://about.me/rjhalehttp://www.northrivergeographic.com/introduction-to-quantum-gis

On 11/15/2015 06:22 PM, Martin Bain wrote:

Hi,

I’m after your suggestions for the best work flow for adding spatial data
to existing tabular data.

Say we have a tabular list of playground equipment – I want to associate a
point object with each row in the list – so I end up with spatial and
attribute data in the one table.



I used to do this in MapInfo, you could open a table of purely tabular
data, select a row in the attribute table, adding a point in the map window
would create a map object for the selected row (rather than adding a whole
new row to the table).  I don’t think I can do it like that with QGIS – am
I right in thinking if there is no geometry for a row it will be excluded
from the attribute table?



How do people do this in QGIS?



Thanks,

Martin.

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Re: [Qgis-user] Creating Geometries for tabular data

[Matthias Kuhn]

Hi,

IIRC you can use the "add part" tool to create geometries for existing
objects. Just use the attribute table to select the proper object and
then digitize with the add part tool. Of course the selected layer has
to be capable of saving geomtries in the format you like (i.e. you
cannot geometrizise an excel table).

Cheers,
Matthias
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