Re: [Qgis-user] QGIS to manage cadastre

[INFANTE, Jorge Luis]

Hi. 
I have seen the plugin Cadastre for qgis, and I find it very good. 
I have been able to create the empty tables, but, now I need to import local
data (or from France, but, I get the impression that I can not download
them). 
I have spatial and alphanumerical data of streets, blocks, plots, owners,
etc. of my city (I am seeing the possibility of adapting qgis, through a
plugin, for the cartographic edition). 
But, I do not understand exactly how to define a minimum set for the
structures of BATI, FANTOIR, LOTLOCAL, NBATI, PDL and PROP. 
Is info available somewhere? 

TIA 
jorge infante 
rosario - santa fe - argentina 



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Re: [Qgis-user] QGIS to manage cadastre

[INFANTE, Jorge Luis]

Hi!
I did post a message, but, I have a yellow comment with "This post has NOT
been accepted by the mailing list yet.".
Any idea to change it?

Thanks
jorge infante
rosario - santa fe - argentina



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Re: [QGIS-it-user] Compatibilità del file .qgs tra 2.x e 3.x

[Marco Spaziani]

Ciao Paolo. Do per scontato  che il tuo lapidario e chiarissimo "si" valga
solo per i file .qgs che si creeranno ex novo con la 3.x quando poi si
tenterà di aprirli con la vecchia 2.18.x ossia, viceversa, do per scontato
la 3.x aprirà senza problemi i file .qgs creati in precedenza con la
vecchia 2.18.x ...vero? ...altrimenti ...addio archivio lavori fatti con la
2.x negli ultimi anni ;-)

Il 16 Ago 2017 10:34, "Paolo Cavallini"  ha scritto:

> Sì.
> Saluti.
>
> Il 16 agosto 2017 08:22:55 WEST, Marco Spaziani 
> ha scritto:
>>
>> Quando sarà, ho intenzione di caricare la LTR (2.10.x ?) sul PC
>> dell'ufficio e la 3.x sul PC di casa. Pensate che ci saranno problemi di
>> "compatibilità" per il file di progetto .qgs quando lo sballottolerò
>> continuamente da una versione all'altra?
>>
>
> --
> Sent from mobile. Sorry for being short
>
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Re: [Qgis-user] AREA ATTRIBUTE FOR VECTOR LAYER

[Christine]

Hi Ricardo,
if you want to get a density of school points in each polygon, you may
calculate this in the field calculator. 
Assure, you are working in a projected coordinate sytem. Open attribute
table and choose 'open field calculator'. With the field calculator dialog
open, give a name to a new attribute for school density, choose an
appropriate output field type (probably decimal number, real), output field
length and precision and use an expression pattern like 
   / $area 

You get the correct syntax of your   
doubleclicking on the field's name under 'fields and values'. Be aware that
$area will have the dimension of the squared coordinate reference system's
measure unit (feet or meters). If you want a density based e.g. on km you
have to devide your area accordingly. 

Regards, Christine






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[Qgis-user] Connecting a bluetooth Garmin GPS to a MAC for live tracking in QGIS

[André Giroux]

Hi !

Well, the title says it all !!! I am trying to connect a Garmin 3580LM GPS unit 
via bluetooth so QGis can use it…Paired OK with Mac, cannot find serial port 
number, as neither Autodetect or Serial works…

Any help appreciated !

André



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Re: [Qgis-user] AREA ATTRIBUTE FOR VECTOR LAYER

[Renato Saboya]

Hello,
Open the layer attribute table, create a new (real) field (or select an
existing field)  and select the $area function under Geometry.
Cheers,
*Renato T. de Saboya*
Universidade Federal de Santa Catarina
Programa de Pós-Graduação em Arquitetura e Urbanismo (PósArq)
Urbanidades  | Infoarq
 | PósArq
 | Academia.edu
 | ResearchGate



On 17 August 2017 at 16:05, Ricardo Thompson  wrote:

> HI]i,
>
> I have a polygon vector layer and want to derive an area attribute to use
> to calculate the density of schools in each polygon. Can somebody help?
>
> Thanks,
>
> Ricardo
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Re: [Qgis-user] AREA ATTRIBUTE FOR VECTOR LAYER

[Christine]

Ricardo Thompson wrote
> I have a polygon vector layer and want to derive an area attribute to use
> to calculate the density of schools in each polygon. Can somebody help?

Hi Ricardo,
if you have a points layer (e.g. for school locations) and a polygon layer
you may count the number of points (schools) that are located in each
polygon with: 
Menu 'Vector' > analysis tools > Count points in polygon. Choosing this
opens a dialog where you can choose your input layers (polygon and points),
an attribute name for the points count and a name and path for the new file
that is created.

Regards, Christine




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[Qgis-user] AREA ATTRIBUTE FOR VECTOR LAYER

[Ricardo Thompson]

HI]i,

I have a polygon vector layer and want to derive an area attribute to use to 
calculate the density of schools in each polygon. Can somebody help?

Thanks,

Ricardo
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Re: [Qgis-user] background transparency

[Richard McDonnell]

Brett,
There appears to be nothing wrong with those examples, if there where, 
you would be informed anyway!
Another approach try this /*gdal_calc.py -A input.tif 
--outfile=result.tif --calc="A*(A>0)" --NoDataValue=0

*/This supposes of course, you are familiar with command line GDAL!

Might I suggest another solution, It will only work with other QGIS 
users, but If you, in Properties, save your style as default, it will 
create a default qgis style with the same name as the raster. When you 
send it along with the raster, or anyone opens the raster, where the 
style is in the same location, the raster will always open as you require.
Without having a subset of your dataset to play with Im sorry, I cant be 
of any more help!!

Regards,

Richard.



On 16/08/2017 03:32, Brett Adams wrote:


Hi Richard,

Trialled your suggestion and others contained in the 
gis.stackexchange.com link.Always get the same result where if any 
of the three bands contain a 0, it’s removed.


Maybe I’ve got the syntax slightly wrong?

*Original *

gdalwarp -overwrite -s_srs EPSG:28351 ""C:/Brett.tif"

*Trialled variations*

gdalwarp -overwrite -srcnodata "0,0,0" -dstnodata "0,0,0" -s_srs 
EPSG:28351 -of GTiff "C:/Brett.tif" "C:/Brett2.tif"


gdalwarp -overwrite -srcnodata "0,0,0" -dstnodata "0,0,0" -of GTiff 
"C:/Brett.tif" "C:/Brett2.tif"


gdalwarp -overwrite -srcnodata None -dstnodata None -dstalpha -s_srs 
EPSG:28351 -of GTiff "C:/Brett.tif" "C:/Brett2.tif"


Brett

*From:*Richard McDonnell [mailto:richard.mcdonn...@opw.ie]
*Sent:* Tuesday, 15 August 2017 11:17 PM
*To:* Brett Adams; qgis-user@lists.osgeo.org
*Subject:* Re: [Qgis-user] background transparency

Hi,
Just looking into this, but you might try whats outlined here

https://gis.stackexchange.com/questions/166699/replacing-rgb-value-0-0-0-with-nodata-nodata-nodata-in-gdal

Warp, can be found under *Raster*, *Projections*,*Warp *fill in the 
fields just as you done before for the Translate, with the exception 
of the nodata field.


At the bottom where you see the GDAL script being constructed, you 
should also see a Pencil or Pen icon, select this, it will allow you 
to directly edit the script.
You should paste */-srcnodata "0,0,0" -dstnodata "0,0,0" /*just 
after*/-overwrite /*so as you have something like below*/.


/*gdalwarp -overwrite -srcnodata "0,0,0" -dstnodata "0,0,0" -of GTiff 
raster_in.tif raster_out.tif


Hope this helps.

Regards,

Richard.



On 15/08/2017 13:42, Brett Adams wrote:

Richard,

Thanks for your response.Gave this a run but it’s not quite
working.

Looks like the problem stems from the colour being defined across
three bands, with black defined by 0,0,0



When “No data = 0” this clears all colours where band 1 = 0. 
Which includes a lot more colours than just black.


Tried entering a few different formats to cover the all 3 bands
but the second  2 are always ignored.

Any thoughts as to how I get 3 bands recognised?

Brett

*From:*Qgis-user [mailto:qgis-user-boun...@lists.osgeo.org] *On
Behalf Of *Richard McDonnell
*Sent:* Monday, 14 August 2017 10:16 PM
*To:* qgis-user@lists.osgeo.org 
*Subject:* Re: [Qgis-user] background transparency

Brett,
Apologies, ive just realised your version of QGIS may not have the
processing toolbox.
You may also do this by going to *RASTER*, *Conversion *and
selecting*Translate *Its the very same tool just a different interface
Regards,

Richard

On 14/08/2017 15:04, Richard McDonnell wrote:

Hi Brett
You can indeed, just use the Processing toolbox, just type
Translate into the search box and select the Translate Tool
under GDAL.
The values you specified as transparent, can be specified
under the Nodata Value
You can also do this as part of a batch if you have a number
of files, you wish to do this for.

Hope this helps,

Richard.

On 14/08/2017 14:07, Brett Adams wrote:

Hi Folks,

I have a geotiff that contains a black ground in areas
where there is no data.  The black background is made
transparent within QGIS via “Layer Properties – Transparency”

Can I export a new Geotiff with the black background removed?

I’m running 2.6.1 On Windows-7. Yes, I know it’s an old
version but I’ve had no reason to update.  So far…

Thanks

*Brett Adams*

*Spinifex-GPX*

*0438 861 974*





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Re: [Qgis-user] Transform not solvable

[Andre Joost]

Am 16.08.2017 um 23:53 schrieb Charles Barrows:

Could the transform
program be confused because the locations are now in a random order in the
GCP table, or could it be something else?



I don't think so. It might be a matter of the Transformation type you 
have chosen.


HTH,
André Joost


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