[Qgis-user] QGIS hangs on multiple edits

[Grant Boxer]

I am adding polygons into a shape file and after about 10 additions, QGIS
hangs or takes a very long time to respond. If I save and end the edit
session after say 5 additions, it appears to be OK. Anyone know why this
might be happening? Could this be being caused by a large number of nodes in
the polygon file being edited?

 

Grant Boxer

Maylands, Western Australia, 6931

 

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[Qgis-user] Spatial Search Of Oracle Table by QGIS

[Simon Greener]

Background.

I executed an "identify" in QGIS against a single mapped object that comes
from an Oracle table with sdo_geometry column.

I dumped the SQL that QGIS executes and I got the following (which I have
compared to the C++ source code):

SELECT "GEOM","ROWID","FID","FID_INT","FID_NUM9","FID_NUM8","FID_NUM7",
  "AN_ATTRIBUTE" 
FROM
 "QGIS"."FOO" "FEATUREREQUEST" 
WHERE sdo_filter("GEOM",
  mdsys.sdo_geometry(2003,2872,NULL,mdsys.sdo_elem_info_array(1,1003,3),
  mdsys.sdo_ordinate_array(5992381.68001308757811785,
  2112468.83721287222579122,5992389.06444318685680628,
  2112476.22164297243580222)))='TRUE' 
AND sdo_relate("GEOM",
  mdsys.sdo_geometry(2003,2872,NULL,mdsys.sdo_elem_info_array(1,1003,3),
  mdsys.sdo_ordinate_array(5992381.68001308757811785,
  2112468.83721287222579122,5992389.06444318685680628,
  2112476.22164297243580222)),'mask=ANYINTERACT')='TRUE'

My question is this. Why does QGIS execute a primary filter (SDO_FILTER)
followed by a secondary filter (SDO_RELATE)? The reason why I ask is that
the secondary filter SDO_RELATE firstly executes its own primary filter
before processing the candidates for the spatial relationship.

The SDO_FILTER is not needed. The Oracle Query Optimizer is still not smart
enough to realise that the sdo_filter is not needed.

regards
Simon



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[Qgis-user] Detecting Geometry Type For Oracle Object

[Simon Greener]

QGIS, when querying Oracle to determine the geometry type in a table's
sdo_geometry column executes the following SQL:

SELECT DISTINCT gtype FROM (SELECT t."GEOMETRY".sdo_gtype AS gtype FROM
""."" t WHERE t."GEOMETRY" IS NOT NULL AND rownum<1000)
WHERE rownum<=2

If there any way that I can force QGIS to change the number it samples?

regards
Simon




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Re: [Qgis-user] Qgis-user Digest, Vol 131, Issue 53

[yoon yoon]

hello friend,
Good Morning, i am yan from forest department.
i am working with areial mapping (resoulation 2 cm) with phanton 3
advance(uav).
aerial mapping software have ndvi, evdi, 2d map .
areial photo is ok but how to do next process with qgis for supply for
forest side.




*Yan Naing Min*

*Staff Officer*

*RS(Forest Department)09-781487714*

On 30 January 2017 at 02:30,  wrote:

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> Today's Topics:
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>1. How can I define the space between lines in a hatched fill
>   pattern? (Khandoker Maniruzzaman)
>2. Re: How can I define the space between lines in a hatched
>   fill pattern? (Raymond Nijssen)
>
>
> --
>
> Message: 1
> Date: Sun, 29 Jan 2017 13:58:08 +0300
> From: Khandoker Maniruzzaman 
> To: Qgis-user@lists.osgeo.org
> Subject: [Qgis-user] How can I define the space between lines in a
> hatched fill pattern?
> Message-ID:
> 

Re: [Qgis-user] Version of GDAL used for the windows binary on qgis site

[Mike]

Thanks all.
Basically I was looking for that info that is found in the about menu
without having to run an installer. I'm settled for now (Thanks Mike!), but
it would be nice to know that info without having to run any executable.
Perhaps an enhancement for the downloads page on the qgis site.

Thanks!
-Mike

On Sat, Jan 28, 2017 at 10:44 AM, Andre Joost 
wrote:

> Am 26.01.2017 um 20:01 schrieb Michael Treglia:
>
>> If installing on Windows, you can use the OSGeo4W installer (
>> https://trac.osgeo.org/osgeo4w/) - and if you choose the advanced option,
>> you can identify (and have some control over) which versions of gdal and
>> other items get installed. (here's the QGIS page on the OSGeo4W installer:
>> https://www.qgis.org/en/site/forusers/alldownloads.html)
>>
>>
> ... and since the Windows standalone installer uses the same build
> process, it comes with the latest GDAL available form OSGEO4W (at the time
> of packaging).
>
> HTH,
> André Joost
>
>
>
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Re: [Qgis-user] How can I define the space between lines in a hatched fill pattern?

[Raymond Nijssen]

Hi Khandoker,

In the "Line pattern fill" dialog in the Style tab, there are options 
for distance, rotation and offset for your lines.


You can use millimeters, pixels or map units as units for the distance 
value.


Good luck,
Raymond



On 29-01-17 11:58, Khandoker Maniruzzaman wrote:

I am using hatched fill patterns for some polygons in a map. The hatch
looks okay in the map composition. But in the exported jpeg file, the
hatch lines are so close to each other, the fill looks like a shade of
grey. It is difficult to distinguish the horizontal, vertical and
diagonal hatches. Is there a way I can control the distance between
lines in the pattern?

Thanks in anticipation.

Khandoker


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[Qgis-user] How can I define the space between lines in a hatched fill pattern?

[Khandoker Maniruzzaman]

I am using hatched fill patterns for some polygons in a map. The hatch
looks okay in the map composition. But in the exported jpeg file, the hatch
lines are so close to each other, the fill looks like a shade of grey. It
is difficult to distinguish the horizontal, vertical and diagonal hatches.
Is there a way I can control the distance between lines in the pattern?

Thanks in anticipation.

Khandoker
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