Re: [Qgis-user] Bug or Feature - QGIS 3.2 raster styling

[CzendaZdenda]

Hi Shawn,

I think, there could be a problem between version 3.2.0 and 3.2.1. I had
version 3.2.0 when I tried your raster and style files first. I delete
middle class from style and everything was ok. But I realized that at your
style file (if you open it as text file) is written 3.2.1 version. So I have
updated my version, try it again and as you has written no data are
displayed. So maybe you can try downgrade your QGIS to 3.2.0 version if it
is possible and check what happen?

I am using windows, not Ubuntu, but maybe it help you :)





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Re: [Qgis-user] Add processing script to toolbox

[Reginald]

No, but previously I made a couple of scripts based on the template. These
scripts resided in the default scripts directory and I guess there is some
logic that loads them in the toolbox on startup?

Regards,



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Re: [Qgis-user] Add processing script to toolbox

[Nyall Dawson]

On Wed, 1 Aug 2018 at 16:03, Reginald  wrote:
>
> >Hi Reginald,
>
> >I had a quick look at this. The issue here is that your script doesn't
> follow the QGIS 3 API for scripts, and >will need to be ported/upgraded.
>
> >I'd suggest a good approach would be to start from the template given when
> you select "Create New Script >from Template" from the processing toolbox
> toolbar. You basically put all your code into the >"processAlgorithm"
> function, so it only runs when the algorithm is executed, not when the
> script file is first >loaded. A quick scan shows that you use some
> deprecated 2.x api which will need to be fixed too - e.g.
> >iface.legendInterface() no longer exists. You can see a list of API breaks
> from 2.x to 3.x here: >https://qgis.org/api/api_break.html. There's also
> quite a lot of resources available via a quick google >search.
>
> >Hope that helps!
> >Nyall
>
> Hi Nyall,
>
> Thanks for looking in to this. Yesterday I installed qgis full from OSGEO4W
> installer and installed it in the default directory.
> When I opened QGIS 3.2 it showed the scripts that were adapted to the
> template were imported in the toolbox.
> So I guess there is some bug concerning changing the default directory
> “OSGEO4W64” to something else.
>

To confirm - you've already upgraded your script to the new API?

Nyall
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Re: [Qgis-user] Add processing script to toolbox

[Reginald]

>Hi Reginald,

>I had a quick look at this. The issue here is that your script doesn't
follow the QGIS 3 API for scripts, and >will need to be ported/upgraded.

>I'd suggest a good approach would be to start from the template given when
you select "Create New Script >from Template" from the processing toolbox
toolbar. You basically put all your code into the >"processAlgorithm"
function, so it only runs when the algorithm is executed, not when the
script file is first >loaded. A quick scan shows that you use some
deprecated 2.x api which will need to be fixed too - e.g.
>iface.legendInterface() no longer exists. You can see a list of API breaks
from 2.x to 3.x here: >https://qgis.org/api/api_break.html. There's also
quite a lot of resources available via a quick google >search.

>Hope that helps!
>Nyall

Hi Nyall,

Thanks for looking in to this. Yesterday I installed qgis full from OSGEO4W
installer and installed it in the default directory.
When I opened QGIS 3.2 it showed the scripts that were adapted to the
template were imported in the toolbox.
So I guess there is some bug concerning changing the default directory
“OSGEO4W64” to something else.

Regards,





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Re: [Qgis-user] Bug or Feature - QGIS 3.2 raster styling

[Shawn Carter]

Sure.  https://1drv.ms/f/s!AhIPPYddAyx1gdsPGUUrwQMwtCGqOA

In that web share folder you'll find a GeoTiff with values ranging from -1
to 1.  The second file is a style file with three classes.  If you remove
the middle class, my QGIS will quit displaying any values...add a third
class it works.

On Tue, Jul 31, 2018 at 4:31 PM Nyall Dawson  wrote:

> On Wed, 1 Aug 2018 at 02:21, Shawn Carter 
> wrote:
> >
> > One of the more common tasks I use QGIS for is creating flood inundation
> and water extent maps using a variety of remotely sensed data.  My general
> method for visualizing the data was to create a discrete singlelayer
> pseudocolor ramp  with two classes.  For example, if using NDWI data I
> would set values of [-1, 0.1] as fully transparent and [0.1, 1] as opaque
> shade of blue.  On Ubuntu 18.04, QGIS 3.2 I've noticed that if I only use
> two classes, the data isn't displayed.  If I add a third class it will be
> displayed.  Is this a problem and should I submit a bug report?
>
> Could you share a sample dataset and project showing this issue?
>
> Nyall
>
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Re: [Qgis-user] Contour Elevation Labeling

[Garth Fletcher]

I made a contour.shp file which contains 5' contours for my area.
I contains a field "ELEV" which holds the elevation in feet.

For the maps I currently am making I wanted:
  10' contour intervals
 100 intervals to use heavier lines and to be labeled.

I use the following settings in the Layer Properties dialog to achieve
the above goals

Source pane:
 Provider feature filter (by using Query Builder)
  "ELEV"%10 = 0 {this ignores any 5' contours, e.g., 105, 115, ...

Symbology pane:
 Simple line
  Stroke width
   Expression: if ((ELEV % 100)=0,0.20,0.075)
 {use 0.200 mm lines for 100' and 0.075 mm for all others}

Label pane:
 Label with
   Expression: if ((ELEV % 100)=0,ELEV,NULL)
 {use ELEV if a multiple of 100, otherwise no label

Hope the above helps,
--
Garth Fletcher,
Mason, NH 03048

Andrew Davies  wrote:

Hello,

I am generating contours from drone deploy & trying to add on contour
interval labels on the vector in QGIS.
My current method for attempting this is:

- layer styling
- abc
- Single Labels
- Label with...

With no elevations option.

Thank you all in advance for the help.

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Re: [Qgis-user] Importing data from ERDDAP server?

[Alexandre Neto]

Hello Cara,

The layer seems to contain 6 different bands. You can use the Single
Grayscale or Single Pseudocolor renderer and select the layer you wish to
visualize.

https://docs.qgis.org/testing/en/docs/user_manual/working_with_raster/raster_properties.html#singleband-gray

Besides, I think the https protocol only allow direct links to files. In
your can the link seems to also contain a query. That may be the reason for
not working.

Alexandre Neto

Cara Wilson - NOAA Federal  escreveu no dia terça,
31/07/2018 às 21:30:

> I’m new to GIS and QGIS, and am trying to figure out the best way to
> import a 3-dimensional (lat-long-time) block of satellite data from an
> ERDDAP server into QGIS.  For example, using erddap I downloaded, using the
> url below,  6 months of chlorophyll data from the equatorial Pacific into a
> file on my computer (the url below generates a file called
> nesdisVHNSQchlaMonthly___.nc where  are randomly generated
> characters.)
>
> I am able to load this data into qGIS using the add raster layer command
> and file as the source type, but I was not able to figure out how to
> differentiate the different temporal layers (Jan -June of 2018).
>
> Additionally I would prefer to download this data directly from errdap
> using the http protocol as the source type.  However nothing happens when I
> used the https, i.e. using the following as input in the url box of the
> https protocol:
>
>
> https://coastwatch.pfeg.noaa.gov/erddap/griddap/nesdisVHNSQchlaMonthly.nc?chlor_a[(2018-01-01T12:00:00Z):1:(2018-06-01T12:00:00Z)][(0.0):1:(0.0)][(20.00625):1:(-20.00625)][(-179.9812):1:(-69.99374)]
>
> Is there a opendap protocol for bringing data into qGIS? Any help on
> either of these issues would be greatly appreciated.
>
> Thank you
>
> Cara Wilson
>
>
>
>
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-
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Re: [Qgis-user] Add processing script to toolbox

[Nyall Dawson]

On Wed, 25 Jul 2018 at 19:32, Reginald  wrote:
>
> Hi,
>
> I'm trying to add some scripts to the toolbox of QGIS-versie
> 3.2.1-Bonn. Whatever I do to import the script in the toolbox fails.
> I use the python icon that is in the menubar of Toolbox Processing.
> I have run the scripts and they work with QGIS 3.21.
> Any help?
>

For reference: I've followed up with Reginald off-list and the actual
issue here is that the script uses 2.x API and needs upgrading to 3.x
API.

Nyall
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Re: [Qgis-user] Bug or Feature - QGIS 3.2 raster styling

[Nyall Dawson]

On Wed, 1 Aug 2018 at 02:21, Shawn Carter  wrote:
>
> One of the more common tasks I use QGIS for is creating flood inundation and 
> water extent maps using a variety of remotely sensed data.  My general method 
> for visualizing the data was to create a discrete singlelayer pseudocolor 
> ramp  with two classes.  For example, if using NDWI data I would set values 
> of [-1, 0.1] as fully transparent and [0.1, 1] as opaque shade of blue.  On 
> Ubuntu 18.04, QGIS 3.2 I've noticed that if I only use two classes, the data 
> isn't displayed.  If I add a third class it will be displayed.  Is this a 
> problem and should I submit a bug report?

Could you share a sample dataset and project showing this issue?

Nyall
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[Qgis-user] Importing data from ERDDAP server?

[Cara Wilson - NOAA Federal]

I’m new to GIS and QGIS, and am trying to figure out the best way to import a 3-dimensional (lat-long-time) block of satellite data from an ERDDAP server into QGIS.  For example, using erddap I downloaded, using the url below,  6 months of chlorophyll data from the equatorial Pacific into a file on my computer (the url below generates a file called nesdisVHNSQchlaMonthly___.nc where  are randomly generated characters.)I am able to load this data into qGIS using the add raster layer command and file as the source type, but I was not able to figure out how to differentiate the different temporal layers (Jan -June of 2018).  Additionally I would prefer to download this data directly from errdap using the http protocol as the source type.  However nothing happens when I used the https, i.e. using the following as input in the url box of the https protocol:  https://coastwatch.pfeg.noaa.gov/erddap/griddap/nesdisVHNSQchlaMonthly.nc?chlor_a[(2018-01-01T12:00:00Z):1:(2018-06-01T12:00:00Z)][(0.0):1:(0.0)][(20.00625):1:(-20.00625)][(-179.9812):1:(-69.99374)]Is there a opendap protocol for bringing data into qGIS? Any help on either of these issues would be greatly appreciated.  Thank you Cara Wilson ___
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Re: [Qgis-user] GDAL producing DEMs that do not load in QGIS 2.18 on Ubuntu but fine on Windows

[Nicolas Cadieux]

Hi,
This is what I would do.

Check if the problem in the lzw compression.  My understanding is that lzw is 
not use when creating raster with gdal using this method.  I found that out 
because my lidar DEM where being created using that command but the file were 
not compress.  Remove it from the command and test.  Perhaps the Windows is 
more tolerant to the file having the lzw tag (not sure this is the case) 
without it being actually compressed.

It also may be a memory problem on Ubuntu.  The lidar DEMs are big.  Try using 
the same script on a smaller subset of the data.

Nicolas

> Le 30 juill. 2018 à 11:13, Cliff Patterson  a écrit 
> :
> 
> I am producing DEMs from LiDAR data using gdal_grid. All processes compete 
> fine, but the resulting DEM does not load into QGIS 2.18 on my Ubuntu 16.04 
> machine but they load fine on my Windows machines (same version of QGIS). 
> When I look at layer properties on Ubuntu machine, the overviews that are 
> produced are not recognized and when I try to rebuild within QGIS, I get an 
> error that I cannot produce overviews for this file type -- it's a Geotif. 
> 
> DEM is produced using the following:
> 
> gdal_grid -zfield field_3 -a nearest:radius1=20:radius2=20 -a_srs epsg:26916 
> -txe 607900.7648882.51 -tye 5322415.07 5349297.05 -outsize 40981.81 
> 26881.98 -co "BIGTIFF=YES" -co "COMPRESS=LZW" --config -a_nodata 0 -l ground2 
> ground2.vrt ground2_grid_1m_nearest_radius20.tif --config GDAL_NUM_THREADS 
> ALL_CPUS --config GDAL_CACHEMAX 2000
> 
> I then turn 0s into NoData with Gdal_calc
> 
> gdal_calc.py --co="COMPRESS=LZW" -A ground2_grid_1m_nearest_radius20.tif 
> --outfile=ground2_grid_1m_nearest_radius20_nodata0.tif --calc="A*(A>0)" 
> --NoDataValue=0
> 
> Then I build overviews with gdaladdo
> 
> gdaladdo -clean --config COMPRESS_OVERVIEW LZW --config INTERLEAVE_OVERVIEW 
> PIXEL -r average ground2_grid_1m_nearest_radius20_nodata0.tif 2 4 8 16 32 64 
> 128 256 512 1024
> 
> Gdalinfo says
> 
> Driver: GTiff/GeoTIFF
> Files: ground2_grid_1m_nearest_radius20_nodata0.tif
> Size is 40981, 26881
> Coordinate System is:
> PROJCS["NAD83 / UTM zone 16N",
> GEOGCS["NAD83",
> DATUM["North_American_Datum_1983",
> SPHEROID["GRS 1980",6378137,298.257222101,
> AUTHORITY["EPSG","7019"]],
> TOWGS84[0,0,0,0,0,0,0],
> AUTHORITY["EPSG","6269"]],
> PRIMEM["Greenwich",0,
> AUTHORITY["EPSG","8901"]],
> UNIT["degree",0.0174532925199433,
> AUTHORITY["EPSG","9122"]],
> AUTHORITY["EPSG","4269"]],
> PROJECTION["Transverse_Mercator"],
> PARAMETER["latitude_of_origin",0],
> PARAMETER["central_meridian",-87],
> PARAMETER["scale_factor",0.9996],
> PARAMETER["false_easting",50],
> PARAMETER["false_northing",0],
> UNIT["metre",1,
> AUTHORITY["EPSG","9001"]],
> AXIS["Easting",EAST],
> AXIS["Northing",NORTH],
> AUTHORITY["EPSG","26916"]]
> Origin = (607900.6953434,5322415.07000298023)
> Pixel Size = (1.19765257072,1.36456977029)
> Metadata:
>   AREA_OR_POINT=Area
> Image Structure Metadata:
>   COMPRESSION=LZW
>   INTERLEAVE=BAND
> Corner Coordinates:
> Upper Left  (  607900.700, 5322415.070) ( 85d33' 8.00"W, 48d 2'45.22"N)
> Lower Left  (  607900.700, 5349297.050) ( 85d32'43.44"W, 48d17'15.62"N)
> Upper Right (  648882.510, 5322415.070) ( 85d 0' 9.50"W, 48d 2'15.55"N)
> Lower Right (  648882.510, 5349297.050) ( 84d59'35.63"W, 48d16'45.69"N)
> Center  (  628391.605, 5335856.060) ( 85d16'24.08"W, 48d 9'46.71"N)
> Band 1 Block=40981x1 Type=Float64, ColorInterp=Gray
>   NoData Value=0
>   Overviews: 20491x13441, 10246x6721, 5123x3361, 2562x1681, 1281x841, 
> 641x421, 321x211, 161x106, 81x53, 41x27
> 
> So as you can see, overviews are produced and the raster is comrpessed with 
> LZW. But... it will not load in QGIS and causes it to crash (on Ubuntu). 
> Loads great on Widows... (boo!)
> 
> Thoughts? 
> 
> Cliff
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[Qgis-user] Learning advice and help for someone who doesn't know coding/command line

[Jon Ellinger]

Hi there,

I've got 10 years in the geospatial industry but I've always used ESRI and
GUI's for what I needed but now I own my own aerial mapping company and
can't afford ESRI and some of the other expensive software.  I'm trying to
learn command line GDAL stuff for simple things like batch clipping, batch
defining coordinate systems, or batch clipping with a .shp poly.  QGIS
sometimes works but some of the batch operations are glitchy or error out.
I know command line stuff is more reliable but I just lost 5 hours trying
to run one script yesterday, failing over and over again because it wasn't
typed in properly.

So - Any suggestions on where I start - online tutorials, youtube channels,
lynda.com tutorials...

Any suggestions would be enormously appreciated.  *I could also possibly
even pay for some remote desktop hands on training by someone out there who
has time to get me set up and running.  *

Thanks!

- Jon


*Professional UAV Services*
*Survey-Grade Mapping, Real Estate, Inspections & Aerial Media*
*Jon Ellinger*, CP, CMS/RS, GISP, Remote Pilot
www.TLT.Photography | 503-290-1096
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[Qgis-user] QGIS version 3.2.1 Released February 2018...

[jameparm]

Hello;
I am totally brand new to QGIS. The version(above) I downloaded this 
week and for the life of me, I can not find any Documentation on this version 
#. The Documentation for earlier releases does not apply to version 3.2.1  With 
that being said, when will the Documentation for QGIS 3.2.1 be available..? I 
have searched the Internet, Youtube, Qgis.org, Github, Reddit and several other 
sources and turned up nothing that applies to 3.2.1 I've read Users Manual 
yesterday and today I started to read to Training manual yet neither apply to 
3.2.1  I am interested in getting started with QGIS, the basics and then 
learning from there but there are no more resources for me to turn to, please 
help...!
James

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[Qgis-user] Bug or Feature - QGIS 3.2 raster styling

[Shawn Carter]

One of the more common tasks I use QGIS for is creating flood inundation
and water extent maps using a variety of remotely sensed data.  My general
method for visualizing the data was to create a discrete singlelayer
pseudocolor ramp  with two classes.  For example, if using NDWI data I
would set values of [-1, 0.1] as fully transparent and [0.1, 1] as opaque
shade of blue.  On Ubuntu 18.04, QGIS 3.2 I've noticed that if I only use
two classes, the data isn't displayed.  If I add a third class it will be
displayed.  Is this a problem and should I submit a bug report?

Thanks,
Shawn
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Re: [Qgis-user] QGIS Download

[John Antkowiak]

Hi, Finbar. I installed the same version only a few weeks ago - my first 
experience with QGIS. It put a shortcut on my desktop linked to "C:\Program 
Files\QGIS 3.2\bin\qgis-bin.exe." I know these are the first places you looked, 
but if your desktop is crowded I suppose you might not see it. It's a bit like 
a green 'Q.' It also installed a raster managing program called GRASS - which I 
was not expecting - also with a shortcut on the desktop.
For whatever that's worth...
John A. 

On Tuesday, July 31, 2018, 11:21:43 AM EDT, GILLEN Finbar 
 wrote:  
 
  
Hi,
 
  
 
I have got IT to download the QGIS 3.2 ‘Bonn’ installer program onto my PC, 
when I run the installer it states that QGIS has installed successfully in my c 
drive however I cannot find it.
 
  
 
I have re started the PC and reinstalled the program and still is nowhere even 
though it states it has installed successfully. Has anyone came across this 
issue before?
 
  
 
Regards
 
Finbar
 
  
 
Finbar GILLEN
Underwriting Performance Analyst
Pricing & Underwriting Department
AXA Insurance dac
Wolfe Tone St, Dublin 1
T: +353 1 471 1377
 
E:finbar.gil...@axa.ie


 
  
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[Qgis-user] QGIS Download

[GILLEN Finbar]

Hi,

I have got IT to download the QGIS 3.2 'Bonn' installer program onto my PC, 
when I run the installer it states that QGIS has installed successfully in my c 
drive however I cannot find it.

I have re started the PC and reinstalled the program and still is nowhere even 
though it states it has installed successfully. Has anyone came across this 
issue before?

Regards
Finbar

Finbar GILLEN
Underwriting Performance Analyst
Pricing & Underwriting Department
AXA Insurance dac
Wolfe Tone St, Dublin 1
T: +353 1 471 1377
E: finbar.gil...@axa.ie


*

The contents and any attachments of this electronic mail message are 
confidential and intended only for the named addressees. Dissemination, 
forwarding, publication or other use of the message or attachments by any 
unauthorised person is strictly prohibited.

Unless stated to the contrary, any opinions expressed in this message are 
personal and may not be attributed to AXA Insurance dac or any member of the 
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Re: [Qgis-user] GPS Live Tracking Problem

[Michael Harte]

Don,

It's been three years since I put this little primer together for some 
data collection we did for a field project.  We were collecting road 
data in lines and some other road infrastructure data with points.  I 
have copied the cheatsheet instructions we used for QGIS2.8 and 2.14 (I 
think/hope they should still generally work with QGIS 3.2.0)


I think what may be happening is that you have to click the "ADD POINT" 
(for waypoint recording) or "ADD LINE" (for line recording) button (see 
steps 9 and 10 below) on the edit toolbar.  This will bring up the 
attribute entry form.  Fill in whatever attributes you want and click 
"OK" (or whatever the button is in 3.2.0 to close the attribute form), 
then click the "SAVE" button on the edit toolbar.


Hope this helps.  Feel free to get in touch with any other questions.

Cheers,
Mike Harte


 *

   *DATA COLLECTION - **(in QGIS project with pre-assembled collection
   templates and background files)*

1. CONNECT GPS RECEIVER to Laptop/Tablet

 o

   (USB [preferable]/Bluetooth)

2. Activate GPS Tools Plugin

3. Activate "GPS Information" panel

 o

   (dock where you prefer)

4. CONNECT "GPS Information" panel to GPS Receiver

 o

   (Click "Connect" - Note "GREEN LIGHT")

5. GPS Information - "DIGITIZING GROUP"

 o

   X - Automatically save added feature

 o

   X - Automatically add points

6. Activate Line/Point file(s)

 o

   (highlight filename in TOC ala ArcView 3.x)

7. Make Line/Point file(s) EDITABLE

 o

   (click "PENCIL" icon on edit toolbar)

8. DRIVE/WALK to end of track/track segment or data collection point

9. To Collect POINT -

 o

   make POINT FILE ACTIVE

 o

   Click "ADD POINT" (GPS Information dialogue)

 o

   Fill in attributes

 o

   SAVE EDITS (disk icon on Edit toolbar)

10. To Collect LINE -

 o

   make LINE FILE ACTIVE

 o

   Click "ADD LINE" (GPS Information dialogue)

 o

   Fill in attributes

 o

   SAVE EDITS (disk icon on Edit toolbar)

11. REMEMBER - When finished collecting EACH feature -

 o

   Activate Line/Point Template (in TOC)

 o

   Click "SAVE LAYER EDITS" on edit toolbar

 o

   Click "SAVE PROJECT" on main toolbar

12. Repeat 8 - 11

*NOTE:*very handy to use a "Repeat previous attributes" function

In menu - "Settings... Options... Digitizing... Feature Creation...

X "Reuse last entered attribute values"

13. When finished collecting ALL features (for the day) -

 o

   Activate Line/Point Template (in TOC)

 o

   Click "SAVE LAYER EDITS" on edit toolbar (if active)

 o

   Toggle "EDITING" (PENCIL icon) off

 o

   Click "SAVE PROJECT" on main toolbar

14. Post processing - MAKE A COPY and clean up line files - as ever

15. Add Estate Name, Smart Cost Region, Environment and Terrain fields

 o

   (use Identity function in ArcMap or SAGA)

16. Generate lengths for each road segment in the SHAPE_Leng field

 o

   (calculate field geometry in table - metres)



Don Parks wrote:

Good Evening,
 
My name is Don Parks and I’m a new QGIS user and a novice at GIS.  I own a commercial farm and have used QGIS to develop a property map with layers containing roads, trails, fields, buildings, etc.  I would like to use my IPhone 8 as a GPS receiver to track movements live and have them appear digitized on a designated map layer and saved as a line feature on that layer.  I would also like to establish waypoints this way as well.  The documentation indicates that this is possible, but I’m having trouble and would be grateful for some help.
 
I’m using QGIS 3.2.0 Bonn.  I’m running Windows 10 Home, 64 bit, on a Dell Latitude E6520 with 8 GB of RAM.  Per recommendations I found in the QGIS documentation, I’m using GPS 2 IP installed on my phone to enable it to send GPS data to my QGIS software.  I’m using the “GPS Information” panel in QGIS as directed.
 
I have successfully established a connection between my phone and QGIS.  Per some instructions I found in the QGIS documentation regarding Live GPS Tracking, I created a new vector line layer (Shapefile type) and enabled editing for that layer and highlighted it in the Layers Panel.  I then traveled around the property and, as hoped, a line was created on the map live as I moved.  At the completion of the route I attempted to save changes.  However, this is where I encountered the problem.  What I noticed first was that the line created by the GPS track was not “attached” to any layer.  If I unchecked all layers, the line was still there on the white map canvas.  And I could not get rid of it unless I closed and re-opened QGIS…at which time it would go away.  On the other hand, I