[Qgis-user] Geojson not showing attributes for all entities

[Richard Males via Qgis-user]

I have a geojson file, around 7700 points, 39 fields per point.   When I
import into QGIS, the attribute table shows only 8 rows, reports
'filtered'.   When I save as .shp and use that, I see all of the points in
the attribute table.

I expect this may have been answered previously, but could not find
anything in a search.

QGIS 3.22.5, Windows 11 Pro.

Thanks in advance.
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Re: [Qgis-user] perturb point locations

[Richard Males]

Thank you.  This appears to be exactly what I need.   I added this plugin
(QGIS 2.12.2 Lyon), it shows up as installed, but I cannot see anywhere to
activate it, no icon, not on any menus, toolbars, or panels.

Dick Males


>
>
> --
>
> Message: 8
> Date: Wed, 27 Jan 2016 15:58:37 +0100
> From: Luigi Pirelli <lui...@gmail.com>
> To: Richard Males <rbma...@gmail.com>
> Cc: qgis-user <qgis-user@lists.osgeo.org>
> Subject: Re: [Qgis-user] perturb point locations
> Message-ID:
> 

Re: [Qgis-user] perturb point locations

[Richard Males]

Thank you very much.   Following your steps revealed the provider, it
worked as desired.  Much appreciated.

Dick

On Wed, Jan 27, 2016 at 12:20 PM, Mike Hyslop <mdhys...@mtu.edu> wrote:

> If you go to Processing > Options and expand Providers, you can find
> Differential Privacy. After checking the box to activate the provider,
> Differential privacy shows up in the Processing Toolbox.
>
> Best,
> Mike
>
> On Wed, Jan 27, 2016 at 12:14 PM, Richard Males <rbma...@gmail.com> wrote:
>
>> Thank you, I had previously looked in there, did not see that specific
>> algorithm.   On checking again, I still do not find it, but I do find
>> v.perturb under GRASS commands/vector, that seems to do the trick.   I am
>> still interested in the differential privacy, however.
>>
>> Dick
>>
>> On Wed, Jan 27, 2016 at 11:57 AM, Luigi Pirelli <lui...@gmail.com> wrote:
>>
>>> seems you shoudl look in processing... the algs are added as provider
>>>
>>>
>>> https://github.com/SpatialVision/differential_privacy/blob/master/anon_methods.py#L51
>>>
>>> bye
>>> Luigi Pirelli
>>>
>>>
>>> **
>>> * Boundless QGIS Support/Development: lpirelli AT boundlessgeo DOT com
>>> * LinkedIn: https://www.linkedin.com/in/luigipirelli
>>> * Stackexchange: http://gis.stackexchange.com/users/19667/luigi-pirelli
>>> * GitHub: https://github.com/luipir
>>> * Mastering QGIS:
>>> https://www.packtpub.com/application-development/mastering-qgis
>>>
>>> **
>>>
>>>
>>> On 27 January 2016 at 17:52, Richard Males <rbma...@gmail.com> wrote:
>>> > Thank you.  This appears to be exactly what I need.   I added this
>>> plugin
>>> > (QGIS 2.12.2 Lyon), it shows up as installed, but I cannot see
>>> anywhere to
>>> > activate it, no icon, not on any menus, toolbars, or panels.
>>> >
>>> > Dick Males
>>> >
>>> >>
>>> >>
>>> >>
>>> >> --
>>> >>
>>> >> Message: 8
>>> >> Date: Wed, 27 Jan 2016 15:58:37 +0100
>>> >> From: Luigi Pirelli <lui...@gmail.com>
>>> >> To: Richard Males <rbma...@gmail.com>
>>> >> Cc: qgis-user <qgis-user@lists.osgeo.org>
>>> >> Subject: Re: [Qgis-user] perturb point locations
>>> >> Message-ID:
>>> >>
>>> >> 

Re: [Qgis-user] perturb point locations

[Richard Males]

Thank you, I had previously looked in there, did not see that specific
algorithm.   On checking again, I still do not find it, but I do find
v.perturb under GRASS commands/vector, that seems to do the trick.   I am
still interested in the differential privacy, however.

Dick

On Wed, Jan 27, 2016 at 11:57 AM, Luigi Pirelli <lui...@gmail.com> wrote:

> seems you shoudl look in processing... the algs are added as provider
>
>
> https://github.com/SpatialVision/differential_privacy/blob/master/anon_methods.py#L51
>
> bye
> Luigi Pirelli
>
>
> **
> * Boundless QGIS Support/Development: lpirelli AT boundlessgeo DOT com
> * LinkedIn: https://www.linkedin.com/in/luigipirelli
> * Stackexchange: http://gis.stackexchange.com/users/19667/luigi-pirelli
> * GitHub: https://github.com/luipir
> * Mastering QGIS:
> https://www.packtpub.com/application-development/mastering-qgis
>
> **********
>
>
> On 27 January 2016 at 17:52, Richard Males <rbma...@gmail.com> wrote:
> > Thank you.  This appears to be exactly what I need.   I added this plugin
> > (QGIS 2.12.2 Lyon), it shows up as installed, but I cannot see anywhere
> to
> > activate it, no icon, not on any menus, toolbars, or panels.
> >
> > Dick Males
> >
> >>
> >>
> >>
> >> ------
> >>
> >> Message: 8
> >> Date: Wed, 27 Jan 2016 15:58:37 +0100
> >> From: Luigi Pirelli <lui...@gmail.com>
> >> To: Richard Males <rbma...@gmail.com>
> >> Cc: qgis-user <qgis-user@lists.osgeo.org>
> >> Subject: Re: [Qgis-user] perturb point locations
> >> Message-ID:
> >>
> >> 

[Qgis-user] perturb point locations

[Richard Males]

I would like to perturb all the point locations on a layer by a random
amount within a range,  from say 100 feet to 500 feet.   Each point should
be individually perturbed with different values for the x and y, but the
overall perturbation range will be the same for the layer.   The purpose is
to obfuscate actual locations in a data set.

I have not been able to locate anything that will do this.  I can use the
Update All capabilities on the attribute table to get values for an
attribute, e.g. attribute_x = $x+randf(100.0,500.0) but I am not clear on
how to push this back to the actual x coordinate of the point.

Any suggestions, including python scripting, plugins, or other approaches,
will be welcome.

Thanks in advance.

Dick Males
Cincinnati, OH USA
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[Qgis-user] Problem with spatial selection on Spatialite spatial view in QGIS

[Richard Males]

spatialite_gui 1.8.0 devel
QGIS 2.12.2-Lyon

For work I am doing in developing a model of coastal flooding, I use
spatialite as the underlying data store for the location and attributes of
structures in a coastal region.

In my spatialite database, I have a table with geometry (Assets), and a
related table with attributes (StructureAssets) but no geometry.   I make a
spatial join via the query/view composer, joining the geometry and
attributes into a spatial view.   I can use this view as a data source in
QGIS, it plots perfectly.   However, when I attempt to select by a
rectangle on the view, the selected points are all over the place, not in
the drawn rectangle.  If I export the view via the spatialite gui as a
shapefile, then selection on the shape file based on the view is fine.
When I create a table in spatialite from the view, and import that table
into QGIS, it shows the same selection behavior as the view, i.e. no good.

Any ideas or thoughts for further testing will be welcome.
Thanks in advance.

Dick
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Re: [Qgis-user] Exporting png or pdf from print composer does not work, empties canvas (Lyon)

[Richard Males]

Sorry, previously posted response under wrong subject:

Thank you.   I have been doing some additional testing, it appears to
relate to having a few maps on the canvas that use the Open Street Map
underlay.  The behavior is pretty much as noted in the referenced issue.

Even with a single OSM underlay, while I do get an export, the
underlay is not complete, i.e. jagged edges where some tiles are missing in
the exported png, even though they do appear on the map.

I will try QuickMapServices.plugin.

Thanks.

Dick
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Re: [Qgis-user] Qgis-user Digest, Vol 118, Issue 49

[Richard Males]

ke sure you are in a CRS that is projected in
> meters.  You should be able to see it.  The map should be at 0,0.
> >>>
> >>> All is not loss...  You can reproject the map to the correct CRS using
> the gdal georeferencing tool.Always back up your data before
> manipulating it.
> >>> Hope this helps!
> >>>
> >>> Nicolas Cadieux M.Sc.
> >>> Les Entreprises Archéotec inc.
> >>> 8548, rue Saint-Denis Montréal H2P 2H2
> >>> Téléphone: 514.381.5112  Fax: 514.381.4995
> >>> www.archeotec.ca
> >>>
> >>> On Dec 28, 2015 01:16, "Jan Becket [via OSGeo.org]" <[hidden email]>
> wrote:
> >>> After much effort, I obtained an old set of 1928-1930 USGS topo maps
> of Oʻahu Island, Hawaiʻi - for a project I am working on. The maps are
> without collars and used by a local archaeological firm. The geotiff maps
> at first showed as completely black on my Mac system (10.10.5 - Yosemite).
> However I found this link with a resultuion for the issue:
> >>>
> >>>
> http://stackoverflow.com/questions/13925995/options-to-convert-16-bit-image
> >>>
> >>> I opened the 16 quads for Oʻahu in Photoshop and applied auto levels,
> after which they became discernable quad maps. However, when imported into
> QGIS, they are now invisible. I wonder if it is possible that I stripped
> away the geotiff CRS information. Prior to the Photoshop operation, the
> maps did appear correctly referenced to Oʻahu Island (although they were
> totally opaque / black).
> >>>
> >>> Now, the maps in QGIS are not visible, although the geotiffs are
> several megabytes in size and are visible when opened in Photoshop,
> Preview, or whatever image viewer.
> >>>
> >>> I should mention that I have successfully imported other sets of USGS
> maps of Oʻahu for this project - the 1902 series, the 1916 series, the 1935
> series - as well as the current series. The early maps used the Old
> Hawaiian CRS (EPSG 3564) but more modern maps use WGS83, Zone 4N (EPSG
> 3711). I have on the fly projection enabled and have tried many CRS
> settings for the maps, but nothing results in a visible quad appearing.
> >>>
> >>> Suggestions very welcome ...
>
> -
> William Kyngesburye <kyngchaos*at*kyngchaos*dot*com>
> http://www.kyngchaos.com/
>
> "This is a question about the past, is it? ... How can I tell that the
> past isn't a fiction designed to account for the discrepancy between my
> immediate physical sensations and my state of mind?"
>
> - The Ruler of the Universe
>
>
>
>
> --
>
> Message: 3
> Date: Tue, 29 Dec 2015 12:55:51 +0200
> From: Anita Graser <anitagra...@gmx.at>
> To: Richard Males <rbma...@gmail.com>
> Cc: qgis-user <qgis-user@lists.osgeo.org>
> Subject: Re: [Qgis-user] Exporting png or pdf from print composer does
> not work, empties canvas (Lyon)
> Message-ID:
> 

[Qgis-user] Exporting png or pdf from print composer does not work, empties canvas (Lyon)

[Richard Males]

I am relatively new to print composer, but have been able to develop some
nice annotated maps.   I was able to successfully export to a png one time,
but since then, exports to png or pdf or svg all fail and empty the
canvas.  If I exit out of qgis and re-start, I can find the previously
populated composer with all elements intact, but I still cannot get an
export.  Windows 8.1, Lyon 2.12.2

Sometimes, not always, after attempting the export, qgis itself will
crash.  I have restarted the computer, same problem.

Is this a bug, or my ignorance?   I usually go for my ignorance, so asking
for help, as print composer looks to be a wonderful tool.

Thanks in advance

Dick
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[Qgis-user] Location of qgis.core and qgis.gui modules for python import?

[Richard Males]

I am trying to develop an external python script using qgis capabilities.
My understanding is that I need to import qgis.core and qgis.gui.   I would
like to do this with the fully qualified path name of the location of these
modules, but cannot seem to find them on my computer, where I have QGIS
Pisa installed.

Thanks in advance

Dick Males
Cincinnati, Ohio, USA
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Re: [Qgis-user] Copy field definitions from one vector layer to another?

[Richard Males]

The join works without a common field of any kind, which is what I wanted,
but unfortunately the field names get prefixed with the join layer.   When
I export as shape file from the joined layer, I get field names like
'exported', 'exported_1', etc.   So I don't think the join will work, since
what I want to do is preserve field names, just copying them from one layer
to another.

Maybe some other approach?   I was hoping for an existing plug-in, but have
not found anything in the repository.   Maybe a python script to export
field names from existing layer?  I will explore that approach, although I
am not very familiar with python scripting for QGIS, see if I can get
started.

Thanks.



On Tue, Oct 20, 2015 at 2:21 AM, Luca Lanteri  wrote:

> why do you need the same geometry type in order to make a join ?
> You just need one common field.
>
> Luca
>
> 2015-10-19 21:44 GMT+02:00 Joris Hintjens :
>
>> I’d try “join layers” if they are the same geometry type
>>
>> Joris
>>
>> Op 17-okt.-2015, om 11:40 heeft Luca Lanteri  het
>> volgende geschreven:
>>
>> You can make a join and then save as layer
>> I have been looking for a capability (plugin or native QGIS) that will
>> easily copy the field definitions (not the attribute data) from one layer
>> to another layer.   To date I have not found it, I may be missing something
>> obvious.  Any help/advice much appreciated.
>>
>> I have a layer with a bunch of fields already defined, and another layer
>> with geometry but no additional fields.   I would like to add the field
>> definitions from the first layer to the second layer, and then populate
>> with the appropriate data for that layer.
>>
>> Thanks.
>>
>> Dick Males
>> Cincinnati, Ohio, USA
>>
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>>
>
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[Qgis-user] Copy field definitions from one vector layer to another?

[Richard Males]

I have been looking for a capability (plugin or native QGIS) that will
easily copy the field definitions (not the attribute data) from one layer
to another layer.   To date I have not found it, I may be missing something
obvious.  Any help/advice much appreciated.

I have a layer with a bunch of fields already defined, and another layer
with geometry but no additional fields.   I would like to add the field
definitions from the first layer to the second layer, and then populate
with the appropriate data for that layer.

Thanks.

Dick Males
Cincinnati, Ohio, USA
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[Qgis-user] Histogram placement and problems in diagram

[Richard Males]

QGIS 2.10.1, Windows 8.1, 64-bit

When I place a histogram bar on a point through the diagrams option, using
a single bar on a single variable, I get odd behavior.  When I place it
around the point, some points have the bar ascending from the point, some
descend from the point.   When I increase the zoom level, all bars extend
up from the point.  I would like all bars to ascend from the point at any
zoom level.

When I place the bar over the point, rather than around the point, almost
all bars seem to disappear.

When I convert to a pie chart, again the 'around point' works but all
circles disappear when I select 'over point'.

Any guidance as to why this might be would be appreciated.

Richard Males
Cincinnati, OH
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[Qgis-user] Obtaining coordinates of polygon labeling points?

[Richard Males]

QGIS has an excellent feature under the layer/labeling menu advanced
tab to turn on/off labeling every part of multi-part features, e.g.
polygons.   This labeling of every part appears to be the only option
available through labeling via properties.  (Version 1.7.2), but for
the world and country maps I am using, a single label per polygon is
much better.

My question: Is it possible to capture the calculated single label
labeling position and export this in some fashion.   I would like to
be able to store this as a geometry column in Postgres.

Thanks.

Dick Males
Cincinnati, OH USA
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Re: [Qgis-user] QGIS and Computer Security (Windows)

[Richard Males]

Thank you and to all others who have posted replies.   I did not
expect that this issue would call forth so many responses.  There have
been a number of helpful suggestions.

Please note that, in some cases, the users I am trying to convince are
in government agencies that have very specific and stringent policies
about software installation.   In one case, only authorized IT
personnel are permitted to install any software on employee computers.
  I am not sure that these policies have come up against the world of
open-source, plug-in based architecture.

I don't know if it goes totally against the philosophy of QGIS, but
maybe there could be a feature to allow an admin option within QGIS to
require password protection before being able to fetch plugins or
activate plugins.  I expect that it could be defeated, but might help
to allay some concerns.  Under this scenario, a QGIS administrator who
could get at a QGIS security options screen where various features
such as downloading plugins could be enabled/disabled for a particular
user installation.

If anyone is interested, the project I am working on involves
estimating delay on transportation networks when roads are flooded.
The architecture has the road network represented in QGIS, which is
then exported to a Spatialite database via a contributed plugin. From
there, a C# program reads the database and does the needed shortest
path and delay cost estimation calculations.  Choosing this
architecture has made things very modular and workable.

QGIS is wonderful software, this is a terrific community.   I
introduced QGIS to a professor who is working on my project and uses
ArcGIS, showing him the line direction decoration capability and
Nathan W's lineswitch plugin, and he responded:  That's interesting
about QGIS, because we have had much difficulty do the same thing in
ArcGIS..

Thanks again to all who have responded.

Dick

On Wed, Feb 22, 2012 at 5:59 PM, Martin Dobias wonder...@gmail.com wrote:
 On Sat, Feb 18, 2012 at 5:08 PM, Richard Males rbma...@gmail.com wrote:

 I would very much appreciate any thoughts on if/how QGIS currently
 deals with this, or references to documentation or postings on the
 issue.

 Hi Richard

 Contributed QGIS python plugins have similar security issues like any
 other extension code that can be downloaded. It is important to note
 that with _any_ python plugin downloaded from repository you cannot be
 100% sure that no malicious code is inside. The server could have been
 hacked, an author's credentials could be stolen or even a previously
 trusted author could put on his black hat (and add some malicious code
 intentionally)...

 In case you are aiming for maximum security I would recommend to use
 one of following approaches:
 1. host a local repository within your organization with known and
 safe plugins. It is really easy to set up one (a web server +
 repository xml file + plugin archives). A customized installation of
 QGIS would use this repository by default. This is a flexible approach
 and allows upgrading/adding plugins quickly by the admin and it is
 convenient for users.
 2. disable python plugin installer completely in a customized
 installation, put there only chosen plugins. Less flexible, but more
 secure - no new plugins, no updates to plugins. (But still possible to
 add plugin installer or other plugins manually)
 3. provide an installation without qgispython library - that
 effectively disables running python code within QGIS. Most secure,
 least flexible.

 Anyway, AFAIK qgis itself should never try to do anything where it
 would need admin rights. So another piece of security (for users with
 some admin privileges) would be to disable qgis to escalate its
 rights.

 Regards
 Martin
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[Qgis-user] QGIS and Computer Security (Windows)

[Richard Males]

I am interested in promoting the use of QGIS, but some users have
expressed concern about computer security issues, particularly in
respect to the use of plug-ins.  The concern is that a downloaded
plugin may contain malware, activate malicious code, etc.  I don't
know if there is any innate protection within QGIS or python against
bad behavior on the part of plugins, or if this is a trust issue.

I have searched online and in the forums for a discussion of this
issue.  I posted on the help forum, the responses were anecdotal in
nature (e.g., I have been using QGIS for a few years, never had a
problem), not technical.

I would very much appreciate any thoughts on if/how QGIS currently
deals with this, or references to documentation or postings on the
issue.

Thank you.

R. Males
Cincinnati, Ohio, USA
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