Hi at all
i succeed !! thank's at all ...Andrew was right ... but i add an another
thing ; i have indicated in the dialogue box , under "default value" ,
in "relational value" the name of the layer B , the right field etc...
and now it's ok !
one more time , thank's !!
laurent
Le 21/12/2016 à 23:32, Andrew a écrit :
Regarding the default values option/limitations, I can add that if you
try to use the default values expression dialog to build an expression
using geomintersects() the dialog will evaluate the expression as
invalid. Instead, build the expression in the field calculator and
then copy/paste it into default value box and skip using the
expression dialog.
Andrew
On Wed, Dec 21, 2016 at 1:32 PM, DelazJ <[email protected]
<mailto:[email protected]>> wrote:
Hi,
Laurent, I can think about different ways you can test to tackle
your issues, provided you have two spatial layers that overlap
(and without any intermediate layer creation):
- recent QGIS introduce default values concept
(http://docs.qgis.org/testing/en/docs/user_manual/working_with_vector/vector_properties.html#common-settings
<http://docs.qgis.org/testing/en/docs/user_manual/working_with_vector/vector_properties.html#common-settings>)
- i'm not really sure about its limitations though
- add a virtual field
(http://docs.qgis.org/2.14/en/docs/user_manual/working_with_vector/attribute_table.html#editing-attribute-values
<http://docs.qgis.org/2.14/en/docs/user_manual/working_with_vector/attribute_table.html#editing-attribute-values>)
that you could later recalculate into a simple field
- use the Autofields plugin
(http://plugins.qgis.org/plugins/AutoFields/
<http://plugins.qgis.org/plugins/AutoFields/>)
- use the SpatialJoin plugin
(http://plugins.qgis.org/plugins/spatialJoin/
<http://plugins.qgis.org/plugins/spatialJoin/>)
Except the SpatialJoin plugin option (which is internally based on
it), you'll need to write an expression likely based on
refFunctions plugin (e.g, geomintersects) someone mentioned above.
HTH,
Harrissou
2016-12-21 19:23 GMT+01:00 Laurent Bourlet
<[email protected] <mailto:[email protected]>>:
Hi,
i thought it was more easy ...
In fact , i don't use a GPS because these points don't need
precision : they are only used to identify the parcels . And i
would like to catch their identity ( a number for each parcel
and the owner ) if possible with a dynamic spatialjoin...
With booth data ( number of parcel and name of owner ) , i
could talk with the fisc administration :-)
Randy was right ...i didn't have the same EPSG for the two
layers . It's now OK ! but without the feature "dynamic" .
Indeed , i would avoid building many temporaries layers and i
thought it existed a plugin for this " dynamic" feature.
If no , i will ask my users to make spatialjoins some time to
time ...
Waiting , i will try the solution of Bernd...
Thank you anyway !
laurent
Le 21/12/2016 à 17:46, Bernd Vogelgesang a écrit :
Hi,
for me this sounds more like he is getting new points once
in a while and
wants to join those attributes to the new points
"automatically" from the
parcel layer.
The biggest problem for users is to rethink the workflow
from the end to
the beginning and to know the limitations.
The outcome should be a point layer with the polygons
attributes. If those
points (layer A) are from GPS as Randy assumes, they have
to be
reprojected to the parcels layer (layer B) before being
able to join them
spatially(layer C). The spatial join in the toolbox
produces layer D.
Most probably, the resulting layer D is going to to be
edited in some way
(adding notes about size, the progress, classifications,
whatever), so you
will have to find a way to preserve those new attribute
while being able to
add new points without much trouble.
The processing toolbox is a good way to do these steps,
though it produces
a lot of temporary files cluttering the project.
A better way for all those repetitive tasks, is to use the
graphical
modeller, to create a workflow which only has to be
triggered once new
points come in, and the resulting file can be saved as new
a file e.g.
with the current date in the name, so you have kind of an
archive and do not
overwrite previous files (and destroy your work in case
something goes
wrong).
So I can imagine a model with input layer A (new points in
WGS84 without attributes) and a parcel layer B (in
whatever projection).
reproject layer A and C will be created as an intermediate
step.
Next input layer is the latest result layer D, reprojected
and with attributes.
Merge layer C and D -> E. Now delete all columns which are
from layer B (from the last spatial join. Unfortunately,
you can only delete one field at a time in the modeller,
so you'll will have to add the command several times in a
row to the model) -> Fn
Do the spatial join of Fn with B.
The last result G will now hold all points with the
corresponding parcel info plus additional fields you might
have added to the points.
G will be the input D in the next run with fresh points.
So, do not add new points to the already existing
collection of points in WGS84 (it is never save to edit
layers without backup), but just import them as a new
input set and then run the model with the parcel layer and
the last result layer.
The modeller is not as intuitive as it should be, but it
can save you a lot of time once you managed to set up a model.
Maybe I was completely wrong analysing the problem, but
maybe someone else has the problem that fits to my solution ;)
Cheers
Bernd
Am 21.12.2016, 14:07 Uhr, schrieb Randal Hale
<[email protected]
<mailto:[email protected]>>:
2 things:
1. In QGIS there is a processing toolbox (I assume you
are one something as new as version 2.14.8). Open it
(it's at the top -> Processing -> Toolbox). You can
search for tools. Search for "join" and you should see
a "Join Attributes by location". This is a spatial join.
2. THE MOST IMPORTANT THING. You mentioned you had
collected points with a GPS. Possibly these points are
in EPSG:4326. I'm going to guess that your parcel
layer isn't. If you right click your parcel layer (in
the layers panel) it will allow you to select
properties. On the General Tab you will see the
Coordinate Reference System mentioned and many times
it is something like EPSG:xxxx . A Spatial Join must
have the layers in the same coordinate system.
If it is different - Right Click on your GPS points
and "Save as". When the "Save vector layer as...."
window comes up. Save it as a shapefile and MOST
IMPORTANTLY change the CRS to match your parcel layer.
Click on the small globe (that appears to be wearing a
hat) and in the filter type in the number you see for
your parcels. You can then select that projection and
Save your file. It should save. You can then perform
the "join by location".
It should work. You are very close though so don't worry.
Randy
On 12/21/2016 01:24 AM, Erwan Conseil wrote:
Hi
In my layer B , I have the name of the owner and
the number of the parcel : this number , a polygon
, have a WKT location . All this is in a SHP . As
I grab points in layer A directly in Qgis (2.18) ,
I have also a SHP . And i need a dynamic join
because I have no desire to make the spatial join
each time...
Regards
Laurent
Le 21 déc. 2016 à 01:30, Randal Hale
<[email protected]
<mailto:[email protected]>> a
écrit :
In your layer B - Do the Names of the Owners
have a location (like a tax parcel) or are
they a spreadsheet (like Microsoft Excel)?
Randy
On 12/20/2016 06:03 PM, Laurent Bourlet wrote:
Hi at all
I'm a beginner in Qgis and i would make a
dynamic spatialjoin.
In fact , i have created a vector layer (
for example A) and i grab points in it
when I'm outdoor ( these points are
buildings unknowned by the government and
so these building are not taxed ...) . I
have also a layer (B) with the name of the
owners of these lands .
You see what i would ?...
I would have these names transferred as
attribut from B to A .
For that , i think about a spatialjoin
with a dynamic feature . So i have
downloaded the two plugins "reffunction"
and "spatialjoin".
But i have certainly maked something wrong
because i don't succeed ...
Is it the good method ?
And If yes , and if exist a doc about
these plugins ...i'll take it :-))
regards
Laurent
( pour les francophones ...je repère et
saisis des points représentants des
batiments construits et visibles par
Google Map mais inconnus par le cadastre
et donc les impôts ...je voudrais donc
enrichir la couche de saisie par les
références des parcelles et les noms des
propriétaires par une jointure spatiale
dynamique ..à chaque point saisi , "monte"
cette référence )
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North River Geographic Systems, Inc
http://www.northrivergeographic.com
<http://www.northrivergeographic.com>
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