[Qgis-user] Qgis-user Digest, Vol 135, Issue 14

Wed May 10 12:14:04 PDT 2017

Hi Grant,

Perhaps th
is link
can be useful to you
:
https://scientiaplusconscientia.wordpress.com/tag/sentinel/

Cheers
!

Hernán

On 10 May 2017 at 16:00, <qgis-user-request at lists.osgeo.org> wrote:

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> Today's Topics:
>
>    1. Merging Sentinel Images (Grant Boxer)
>    2. Re: Keeping only POIs X kms from a trace? (Matt Boyd)
>    3. Crashing (Allan Younger)
>    4. Re: Crashing (Nyall Dawson)
>    5. Re: Keeping only POIs X kms from a trace? (Winfried)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Wed, 10 May 2017 08:50:43 +0800
> From: "Grant Boxer" <boxerg at iinet.net.au>
> To: <qgis-user at lists.osgeo.org>
> Subject: [Qgis-user] Merging Sentinel Images
> Message-ID: <000001d2c927$74297ff0$5c7c7fd0$@iinet.net.au>
> Content-Type: text/plain; charset="utf-8"
>
> I am attempting to merge two adjacent Sentinel 2 images, but when I do it
> via the Raster > Miscellaneous > Merge option, I get the two merged parts
> with a different scaling in the merged image. Any suggestions on how to get
> a consistent scaling across the entire merged image?
>
>
>
> Grant Boxer
>
> Maylands, Western Australia, 6931
>
>
>
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> ------------------------------
>
> Message: 2
> Date: Wed, 10 May 2017 13:18:05 +1000
> From: Matt Boyd <mattslists at gmail.com>
> To: Winfried <codecomplete at free.fr>
> Cc: qgis-user <qgis-user at lists.osgeo.org>
> Subject: Re: [Qgis-user] Keeping only POIs X kms from a trace?
> Message-ID:
>         <CAFgHUGL+RBkYmWYy7vU=9wj1kvZvnFMrVCYHepHH7RRu8R=vrw
> @mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> Hi Winfried,
> usually in QGIS, unless it's specified differently, the distance field is
> in the same units as the project properties. So, 5km would be 5000m in the
> the projected UTM zones which use meters.
> If 0,05 worked then I assume that your project is in
> degrees/minutes/seconds (https://en.wikipedia.org/wiki/Decimal_degrees)
> which is approximately 5km at the equator, close enough for what you want
> to do this time.
>
> One of the key things you'll need to know about if you keep working on GIS
> stuff is projections, QGIS can automatically reproject for map displays.
> However, when doing a calculation / operation that involves 2 or more
> inputs then I make sure to reproject all the inputs to the same system and
> work on those files only (save as and select a common projection) knowing
> the UTM zone or whatever meters/feet projection is used locally is helpful
> when you need to work out distances and areas in useful units.
>
> Matt
>
>
>
> On Tue, May 9, 2017 at 7:22 PM, Winfried <codecomplete at free.fr> wrote:
>
> > Thank you.
> >
> > Turns out I was pretty close to the solution: The error was in the order
> > parameters were set in the Spatial Query dialog. Also, there is no
> > information on the unit used for Distance in the Fixed Distance Buffer; I
> > guess "0,05" means 5kms.
> >
> > <http://osgeo-org.1560.x6.nabble.com/file/n5319849/QGIS.png>
> >
> > I'll see if a simple Python script can perform the same thing, or even
> > split
> > campsites into regions instead of whole nations.
> >
> >
> >
> > --
> > View this message in context: http://osgeo-org.1560.x6.
> > nabble.com/Keeping-only-POIs-X-kms-from-a-trace-tp5319730p5319849.html
> > Sent from the QGIS - User mailing list archive at Nabble.com.
> > _______________________________________________
> > Qgis-user mailing list
> > Qgis-user at lists.osgeo.org
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> ------------------------------
>
> Message: 3
> Date: Wed, 10 May 2017 03:54:38 +0000
> From: "Allan Younger" <ahyounger at iinet.net.au>
> To: qgis-user at lists.osgeo.org
> Subject: [Qgis-user] Crashing
> Message-ID: <em4ea9ad0d-5f29-486e-8c2b-1a16491d31bd at ufo2>
> Content-Type: text/plain; charset="utf-8"; Format="flowed"
>
> I am having major problems with the latest QGIS 2.18.7 crashing all the
> time with only a very small number of layers open.
> Have uninstalled & re-installed 3 times.
> Previous versions handled huge amount more data.
> Running a 64 bit 16gb wind 7pro system.
> Allan Younger
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> ------------------------------
>
> Message: 4
> Date: Wed, 10 May 2017 14:39:37 +1000
> From: Nyall Dawson <nyall.dawson at gmail.com>
> To: Allan Younger <ahyounger at iinet.net.au>
> Cc: qgis-user <qgis-user at lists.osgeo.org>
> Subject: Re: [Qgis-user] Crashing
> Message-ID:
>         <CAB28Asi08cy_jZbNree5YX7kv_N1YcUbmHWq2cN0mW1YM6qafw at mail.
> gmail.com>
> Content-Type: text/plain; charset=UTF-8
>
> On 10 May 2017 at 13:54, Allan Younger <ahyounger at iinet.net.au> wrote:
> > I am having major problems with the latest QGIS 2.18.7 crashing all the
> time
> > with only a very small number of layers open.
> > Have uninstalled & re-installed 3 times.
> > Previous versions handled huge amount more data.
> > Running a 64 bit 16gb wind 7pro system.
> > Allan Younger
>
> Can you please check:
> 1. do you have on the fly reprojection enabled?
> 2. are any layers in your project in a different projection to the
> project itself?
> 3. if so, does removing these layers from the project help?
>
> Nyall
>
>
> ------------------------------
>
> Message: 5
> Date: Wed, 10 May 2017 02:36:09 -0700 (MST)
> From: Winfried <codecomplete at free.fr>
> To: qgis-user at lists.osgeo.org
> Subject: Re: [Qgis-user] Keeping only POIs X kms from a trace?
> Message-ID: <1494408969084-5320022.post at n6.nabble.com>
> Content-Type: text/plain; charset=us-ascii
>
> Thanks for the infos. I didn't know about CRS, although I could have
> guessed
> that it wouldn't make sense to specify meters when GPX files contain data
> in
> latitude + longitude, ie. degrees. I used 0,05 by trial and error.
>
>
>
> --
> View this message in context: http://osgeo-org.1560.x6.
> nabble.com/Keeping-only-POIs-X-kms-from-a-trace-tp5319730p5320022.html
> Sent from the QGIS - User mailing list archive at Nabble.com.
>
>
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> End of Qgis-user Digest, Vol 135, Issue 14
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