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I'm trying to generate a Steiner tree in QGIS 2.18.2 using a simple set of points, and a simple line vector. See the screen shot below:

enter image description here

I then open up v.net.steiner, set the points and vector layers.

enter image description here

However, I get the following message saying 'The following layers were not correctly generated'. See below: enter image description here

Having looked at other questions similar to this, (i) I have made sure both layers are in WGS84 for consistency, and (ii) I have tried saving the output file in different places such as on my desktop, or as a temporary file. Neither of these worked however.

Does anyone have any other suggestions?

Output log is as follows:

`Algorithm v.net.steiner - Creates Steiner tree for the network and given terminals starting... g.proj -c proj4="+proj=longlat +datum=WGS84 +no_defs" v.in.ogr min_area=0.0001 snap=-1 input="C:/Users/EJO31/Dropbox/Digital Comms - Fixed broadband model/Data/OpenStreetMap" layer=manhattan_line_vector_layer_WGS84_4_points output=tmp15156647622235 --overwrite -o v.in.ogr min_area=0.0001 snap=-1 input="C:/Users/EJO31/Dropbox/Digital Comms - Fixed broadband model/Data/OpenStreetMap" layer=manhattan_drive_WGS84_4_points output=tmp15156647622236 --overwrite -o g.region n=52.2135296 s=52.210668029 e=0.1360675 w=0.1327734 res=100 v.net -s input=tmp15156647622235 points=tmp15156647622236 out=tmp15156647622237 op=connect threshold=50 v.db.connect -o map=tmp15156647622237 table=tmp15156647622236 layer=2 v.net.steiner input=tmp15156647622237 arc_type=line,boundary terminal_cats="1-100000" npoints="-1" output=output22f3548a7a4a413eb6b3039d3c14746c --overwrite v.out.ogr -s -e input=output22f3548a7a4a413eb6b3039d3c14746c type=auto output="C:\Users\EJO31\AppData\Local\Temp\processing7112f5e23ee04250aae815ef39efcc02\cb8c1eab320b46aca5fc9590aee4c19d" format=ESRI_Shapefile output_layer=output --overwrite

C:\PROGRA~1\QGIS2~1.18\bin>set HOME=C:\Users\EJO31

C:\PROGRA~1\QGIS2~1.18\bin>set GISRC=C:\Users\EJO31.qgis2\processing\processing.gisrc7

C:\PROGRA~1\QGIS2~1.18\bin>set WINGISBASE=C:\PROGRA~1\QGIS2~1.18\apps\grass\grass-7.0.5

C:\PROGRA~1\QGIS2~1.18\bin>set GISBASE=C:\PROGRA~1\QGIS2~1.18\apps\grass\grass-7.0.5

C:\PROGRA~1\QGIS2~1.18\bin>set GRASS_PROJSHARE=C:\PROGRA~1\QGIS2~1.18\apps\grass\grass-7.0.5\share\proj

C:\PROGRA~1\QGIS2~1.18\bin>set GRASS_MESSAGE_FORMAT=plain

C:\PROGRA~1\QGIS2~1.18\bin>if "" == "" set PATH=C:\PROGRA~1\QGIS2~1.18\apps\grass\grass-7.0.5\bin;C:\PROGRA~1\QGIS2~1.18\apps\grass\grass-7.0.5\lib;C:\PROGRA~1\QGIS2~1.18\apps\Python27\lib\site-packages\Shapely-1.2.18-py2.7-win-amd64.egg\shapely\DLLs;C:\PROGRA~1\QGIS2~1.18\apps\Python27\DLLs;C:\PROGRA~1\QGIS2~1.18\apps\Python27\lib\site-packages\numpy\core;C:\PROGRA~1\QGIS2~1.18\apps\qgis\bin;C:\PROGRA~1\QGIS2~1.18\apps\grass\grass-7.0.5\lib;C:\PROGRA~1\QGIS2~1.18\apps\grass\grass-7.0.5\bin;{app};C:\PROGRA~1\QGIS2~1.18\apps\Python27\Scripts;C:\PROGRA~1\QGIS2~1.18\bin;C:\Windows\system32;C:\Windows;C:\Windows\WBem;C:\Program Files\R\R-3.4.0\bin\x64;C:\Program Files\RStudio\bin

C:\PROGRA~1\QGIS2~1.18\bin>if not "" == "" set PATH=C:\PROGRA~1\QGIS2~1.18\apps\grass\grass-7.0.5\bin;C:\PROGRA~1\QGIS2~1.18\apps\grass\grass-7.0.5\lib;;C:\PROGRA~1\QGIS2~1.18\apps\grass\grass-7.0.5\bin;C:\PROGRA~1\QGIS2~1.18\apps\grass\grass-7.0.5\lib;C:\PROGRA~1\QGIS2~1.18\apps\Python27\lib\site-packages\Shapely-1.2.18-py2.7-win-amd64.egg\shapely\DLLs;C:\PROGRA~1\QGIS2~1.18\apps\Python27\DLLs;C:\PROGRA~1\QGIS2~1.18\apps\Python27\lib\site-packages\numpy\core;C:\PROGRA~1\QGIS2~1.18\apps\qgis\bin;C:\PROGRA~1\QGIS2~1.18\apps\grass\grass-7.0.5\lib;C:\PROGRA~1\QGIS2~1.18\apps\grass\grass-7.0.5\bin;{app};C:\PROGRA~1\QGIS2~1.18\apps\Python27\Scripts;C:\PROGRA~1\QGIS2~1.18\bin;C:\Windows\system32;C:\Windows;C:\Windows\WBem;C:\Program Files\R\R-3.4.0\bin\x64;C:\Program Files\RStudio\bin

C:\PROGRA~1\QGIS2~1.18\bin>set GRASS_VERSION=7.0.0

C:\PROGRA~1\QGIS2~1.18\bin>if not "" == "" goto langset

C:\PROGRA~1\QGIS2~1.18\bin>FOR /F "usebackq delims==" %i IN ("C:\PROGRA~1\QGIS2~1.18\apps\grass\grass-7.0.5\etc\winlocale") DO @set LANG=%i

C:\PROGRA~1\QGIS2~1.18\bin>set PATHEXT=.COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH;.MSC;.PY

C:\PROGRA~1\QGIS2~1.18\bin>set PYTHONPATH=;C:\PROGRA~1\QGIS2~1.18\apps\grass\grass-7.0.5\etc\python;C:\PROGRA~1\QGIS2~1.18\apps\grass\grass-7.0.5\etc\wxpython\n

C:\PROGRA~1\QGIS2~1.18\bin>g.gisenv.exe set="MAPSET=PERMANENT"

C:\PROGRA~1\QGIS2~1.18\bin>g.gisenv.exe set="LOCATION=temp_location"

C:\PROGRA~1\QGIS2~1.18\bin>g.gisenv.exe set="LOCATION_NAME=temp_location"

C:\PROGRA~1\QGIS2~1.18\bin>g.gisenv.exe set="GISDBASE=C:\Users\EJO31\AppData\Local\Temp\processing7112f5e23ee04250aae815ef39efcc02\grassdata"

C:\PROGRA~1\QGIS2~1.18\bin>g.gisenv.exe set="GRASS_GUI=text"

C:\PROGRA~1\QGIS2~1.18\bin>g.proj -c proj4="+proj=longlat +datum=WGS84 +no_defs" Default region was updated to the new projection, but if you have multiple mapsets g.region -d should be run in each to update the region from the default Projection information updated

C:\PROGRA~1\QGIS2~1.18\bin>v.in.ogr min_area=0.0001 snap=-1 input="C:/Users/EJO31/Dropbox/Digital Comms - Fixed broadband model/Data/OpenStreetMap" layer=manhattan_line_vector_layer_WGS84_4_points output=tmp15156647622235 --overwrite -o Over-riding projection check Check if OGR layer contains polygons... 0..10..20..30..40..50..60..70..80..90..100 Importing 10 features (OGR layer )... 0..10..20..30..40..50..60..70..80..90..100 ----------------------------------------------------- Building topology for vector map ... Registering primitives...

10 primitives registered 62 vertices registered Building areas... 0..10..20..30..40..50..60..70..80..90..100 0 areas built 0 isles built Attaching islands... Attaching centroids... 10..20..30..40..50..60..70..80..90..100 Number of nodes: 15 Number of primitives: 10 Number of points: 0 Number of lines: 10 Number of boundaries: 0 Number of centroids: 0 Number of areas: 0 Number of isles: 0

C:\PROGRA~1\QGIS2~1.18\bin>v.in.ogr min_area=0.0001 snap=-1 input="C:/Users/EJO31/Dropbox/Digital Comms - Fixed broadband model/Data/OpenStreetMap" layer=manhattan_drive_WGS84_4_points output=tmp15156647622236 --overwrite -o Over-riding projection check Check if OGR layer contains polygons... 0..20..40..60..80..100 Column name renamed to Column name renamed to Importing 5 features (OGR layer )... 0..20..40..60..80..100 ----------------------------------------------------- Building topology for vector map ... Registering primitives...

5 primitives registered 5 vertices registered Building areas... 0..20..40..60..80..100 0 areas built 0 isles built Attaching islands... Attaching centroids... 20..40..60..80..100 Number of nodes: 0 Number of primitives: 5 Number of points: 5 Number of lines: 0 Number of boundaries: 0 Number of centroids: 0 Number of areas: 0 Number of isles: 0

C:\PROGRA~1\QGIS2~1.18\bin>g.region n=52.2135296 s=52.210668029 e=0.1360675 w=0.1327734 res=100

C:\PROGRA~1\QGIS2~1.18\bin>v.net -s input=tmp15156647622235 points=tmp15156647622236 out=tmp15156647622237 op=connect threshold=50 Copying features... 10..20..30..40..50..60..70..80..90..100 Building topology for vector map ... Registering primitives...

10 primitives registered 62 vertices registered Number of nodes: 15 Number of primitives: 10 Number of points: 0 Number of lines: 10 Number of boundaries: 0 Number of centroids: 0 Number of areas: - Number of isles: - Copying attributes... Building topology for vector map ... Registering primitives...

19 primitives registered 75 vertices registered Building areas... 0..5..10..15..21..26..31..36..42..47..52..57..63..68..73..78..84..89..94..100 0 areas built 0 isles built Attaching islands... Attaching centroids... 5..10..15..21..26..31..36..42..47..52..57..63..68..73..78..84..89..94..100 Number of nodes: 19 Number of primitives: 19 Number of points: 5 Number of lines: 14 Number of boundaries: 0 Number of centroids: 0 Number of areas: 0 Number of isles: 0 v.net complete. 4 lines (network arcs) written to output.

C:\PROGRA~1\QGIS2~1.18\bin>v.db.connect -o map=tmp15156647622237 table=tmp15156647622236 layer=2 The table is now part of vector map and may be deleted or overwritten by GRASS modules Select privileges were granted on the table

C:\PROGRA~1\QGIS2~1.18\bin>v.net.steiner input=tmp15156647622237 arc_type=line,boundary terminal_cats="1-100000" npoints="-1" output=output22f3548a7a4a413eb6b3039d3c14746c --overwrite Number of terminals: 5 Number of Steiner points set to 3 Building graph... Registering arcs... 5..10..15..21..26..31..36..42..47..52..57..63..68..73..78..84..89..94..100 Flattening the graph... Graph was built Init costs from node 9 Init costs from node 12 Init costs from node 15 Init costs from node 17 Init costs from node 19 ERROR: Terminal at node [9] cannot be connected to terminal at node [15]

C:\PROGRA~1\QGIS2~1.18\bin>v.out.ogr -s -e input=output22f3548a7a4a413eb6b3039d3c14746c type=auto output="C:\Users\EJO31\AppData\Local\Temp\processing7112f5e23ee04250aae815ef39efcc02\cb8c1eab320b46aca5fc9590aee4c19d" format=ESRI_Shapefile output_layer=output --overwrite ERROR: Vector map not found

C:\PROGRA~1\QGIS2~1.18\bin>exit Converting outputs Loading resulting layers

The following layers were not correctly generated. Network_Steiner You can check the log messages to find more information about the execution of the algorithm`

0

Try and use UTM for all of your layers. Grass GIS prefers this

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