Re: [Qgis-user] Advance Digitising Tools- compass bearings

[Kirk Schmidt via QGIS-User]

Hi Calvin:

An interesting question.  Another consideration is the coordinate system 
for your project.  If it is a projected system, then you should consider 
convergence which is the angle between true north and grid north.  In a 
common example, UTM zone meridians are the center of each zone which are 
given an arbitrary easting of 500,000m.  If you are converting from 
magnetic to true north close to the meridian, then true north will be 
very close to grid north.  If you are east of the meridian, perhaps 
close to the adjacent zone boundary,  then grid north and true north 
will vary noticeably.


We developed a script for calculating convergence in UTM as I am unaware 
of a plugin provides that level of functionality. Ultimately, it will 
depend on the coordinate system you are working in.  If you reach out to 
me privately, I can share the script with you.


Kirk Schmidt

k...@nortekresources.com

On 5/17/2024 9:15 AM, Jeremy Jackson via QGIS-User wrote:



On 2024-05-17 07:00, C Hamilton via QGIS-User wrote:

Phil,

The Shape Tools plugin has an "Azimuth distance digitizer" and for 
what you are talking about an "Azimuth distance sequence digitizer". 
With the latter function you click on a starting location and then 
give a list of azimuth, distance sequences. I have used this for old 
surveys like this. There is also an declination offset just in case 
your surveys were using magnetic north and not true north. In that 
case you have to look up what the
A related question, what about grid to ground conversions and 
vice-versa, are there plugins which support this?  Surveys here in 
Canada always specify a "combined scale factor", which is tedious to 
apply manually to each vertex when digitizing.

declination offset was for your 1880s date.

Regards,
Calvin

On Thu, May 16, 2024 at 9:50 PM Philip Ryan via QGIS-User 
 wrote:


Hello,
I am trying to digitise a series of old gold lease "portion
plans" produced in the 1880s in Australia by a mining surveyor
using a compass and chain. The data for each gold lease includes
a table of  1) compass bearings in degrees and 2) distance
measurements in links (0.2 m) for each vertex of the lease
polygon (mostly a rectangle or trapezoid but sometimes more
complex).
The Advance Digitizing Tools would seem to be ideal for this data
except for the angle measure (a) which I can't input as a compass
bearing (0-360 deg). The current settings with 90 deg E as the
zero makes conversion of compass bearings very tedious.
Is it possible to change the angle variable (a) to a compass bearing?
Regards,
Phil Ryan
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Re: [Qgis-user] gridding with a polygon

[Kirk Schmidt via QGIS-User]

Hi Byron:

If I understand this correctly, you are concerned with how the contours 
will be generated at the edge of your raster data.  If I have this 
correct, I would grid the data that you have based on the attribute you 
want to contour.


Create a vector clip layer for your study area that is at least 1 grid 
cell smaller than the the boundary size of the original vector data.


Then create the contours from this new raster and you should be good to go.

Kirk Schmidt

On 5/2/2024 2:07 PM, Byron Veilleux via QGIS-User wrote:

i have a large geologic dataset that i want to grid and contour.
There is an irregular zero edge that bounds these data on one side and
a straight bounding area edge on the other sides.  If i create an 
irregular polygon that encloses these data, is there a way to grid and 
contour such that these data are truncated against the polygon and do 
not extend beyond?

--
Byron Veilleux, MSc. P.Geo
Conjugate Geologic Services Limited
Calgary, Alberta Canada
by...@conjugategeo.com
Cell:4037108414

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Re: [Qgis-user] Problem with contour algorithm

[Kirk Schmidt via QGIS-User]

Hi Grant:

Based on the other comments,  I tested a shapefile and the following 
GDAL command works


gdal_contour -b 1 -a ELEV -i 10.0 -f "ESRI Shapefile" "K:/Work2/McCallum 
Environmental/Wedgeport/Land Clearing/CHM Clearing.sdat" 
K:/Temp/contour_test.shp


The only difference is that in your example you have /vsimem/xxx.tif.  
There are no double quotes so I do not know if you are using a path 
variable or similar.  I would try an actual path to the tif dem file.


Kirk Schmidt

On 3/13/2024 12:37 AM, Grant Boxer via QGIS-User wrote:


I am trying to contour a grid file using the QGIS raster > 
extract>contour and I get getting errors saying “Warning 1: Model file 
not specified” or “ERROR 4: No such file or directory”.


I am using 3.34 and 3.36 and get the same error.

Any thoughts?

Regards Grant Boxer, Perth WA


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Re: [Qgis-user] Issues Extracting LiDAR From a Tif file to a Golden 7 Software Binary Grid (.GRD)

[Kirk Schmidt via QGIS-User]

Hi Hudson:

I just tried to export to golden 7 binary with QGIS version 3.20 and 
3.28 running on windows 8 and it worked fine.


Kirk

On 2/13/2024 12:27 PM, Hudson Mealy via QGIS-User wrote:

  Hello,

I just purchased a new computer. ROG GEOFORCE RTX STRYX and have 
downloaded QGIS 3.34.3. I was previously using a microsoft surface 
with GQIS 3.26.3. We use QGIS to extract lidar from a large area to 
individual fields (160-700 acres) to be used for drainage 
applications. The large lidar files are uploaded into QGIS in a tif 
file format. From there I use the raster extraction tool and clip 
raster by extent (The field boundary). From there I use the raster 
calculator tool, I choose the file destination which is into the ADMS 
drainage software. I then choose the golden software 7 binary grid 
file type for an output, and in the bottom box I multiply the clipped 
extent by 3.2808 to convert from metres to feet. From here I hit save, 
however QGIS does not respond and no matter how long I leave it it 
will not calculate the operation, I have to force quit the 
application. However, when going back to my old microsft surface 
everything works as normal. I am confused on to what has changed other 
than the newer QGIS download, why is my 5 year old laptop running this 
application without a hitch but my new desktop computer will not 
handle it.


If anyone has any solutions that would be very helpful!

Thanks


--
Hudson Mealy
Impact Tile Drainage
Box 172
Minto, Manitoba
R0K 1M0
204-305-0877
impacttiledrain...@gmail.com

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Re: [Qgis-user] Pansharpening Problem

[Kirk Schmidt via QGIS-User]

Hi Grant:

If you are ending up with null values and zero's, check the values in 
the raster you are pan sharpening against the training or higher 
resolution raster you are using to sharpen. Is there null data in the 
high res raster.  Review the input requirements of the routine to ensure 
the tool will work with your data. Perhaps pan sharpening a 3 channel 
raster with a single channel raster creates the problem.


Kirk Schmidt

On 11/15/2023 9:52 PM, Grant Boxer via QGIS-User wrote:


I am attempting to pansharpen a PRISMA hyperspectral RGB image and I 
am getting areas within the image that are clipped (no data). These 
appear to bands with zero values in two of the three bands. Anyone 
have a work around or suggest how this can be avoided. I am using the 
gdal pansharpen tool and latest release QGIS 3.34.


Cheers Grant

Perth WA


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B0K 1W0
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Re: [Qgis-user] filtering data from highest to lowest in QGIS

[Kirk Schmidt via QGIS-User]

Hi Simon;


Why yes of course you can.  Please see the Filtering in Layer Properties 
section at the following link which provides the basics.



https://mapscaping.com/filtering-in-qgis-a-comprehensive-guide/


You can use the array functions to select and sort attributes as required.


Kirk Schmidt


On 8/17/2023 12:09 PM, Simon via QGIS-User wrote:

Hi all,

Just had a quick question. Is it possible to filter and display the 10 
highest values in a field using the Query Builder or Field calculator?


Thanks,

Simon

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B0K 1W0
Tel (902) 922.3607
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Re: [Qgis-user] Clipping ecw to mask not working

[Kirk Schmidt via QGIS-User]

Hi Michael:

Enhance Compression Wavelet (ECW) is a proprietary compression format.  
I would try exporting your image as a geotiff to see if it is being read 
correctly and does not have internal write protection on it.


Kirk Schmidt

On 7/26/2023 2:02 AM, Michael Dufty via QGIS-User wrote:


I'm having issues trying to clip ecw images to a mask layer.

Using raster-extraction-clip raster to mask layer.

Default parameters.

The tool runs extremely quickly (successfullyin 0.12 seconds), but 
produces a raster entirely black (0,0,0 for all pixels).  With the 
correct extent of the mask layer.


If I tick the box to create an alpha output band it produces an 
entirely transparent result.


Source and mask layers both in EPSG 28350

Anyone else having this issue?  I cannot see any bug reports.

Tried in 328.8, 3.28.9, 3.32.0 and 3.32.1 with same result.

Seems to work fine if input raster is a tif.


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Re: [Qgis-user] YOLO Algorithm on Oil Palm Tree Counting

[Kirk Schmidt via QGIS-User]

Hi Loke;

I know that You Only Look Once (YOLO) is a neural network approach that 
is not very good at detecting small objects in an image.  This may be 
problematic depending on the scale of your plantation image mosiacs.


The image.darknet package in R is a YOLO solver.  It can be implemented 
in QGIS.


Kirk Schmidt

On 7/21/2023 1:17 AM, Loke Jian
 Munn via QGIS-User wrote:


Hi Everyone,

I have been recommended to try YOLO Algorithm on oil palm tree 
recognition and counting. (DSM and Orthomosaic )


Just to ask if someone have any insights of this algorithm and provide 
any reference or guidance ?


Thank you.

*Loke Jian Munn*

Information Technology (IT) Department

*KUALA LUMPUR KEPONG BERHAD*

Wisma Taiko,

No. 1, Jalan S.P. Seenivasagam,

3 Ipoh,Perak Darul Ridzuan,Malaysia

*T : *+605 240 8000 (ext. 2443)

A close up of a sign Description automatically generated 
*A 
close up of a sign Description automatically generated* 




DISCLAIMER : This email and any attachments are confidential and 
intended solely for the addressee. If you are not the intended 
recipient, any disclosure, copying, distribution either whole or 
partial, is prohibited and may be unlawful. In such case, please 
delete this message and kindly notify the sender.

*Kuala Lumpur Kepong Berhad *

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Re: [Qgis-user] Reclassify field values from txt rule file in QGIS

[Kirk Schmidt via QGIS-User]

Hi Fabio:


This is GRASS function and you can find an explanation at:

https://www.ibiblio.org/pub/packages/gis/grass/grass63/manuals/html63_user/v.reclass.html

Instead of a simple lookup table, some sql sytax is required.

9110 - (Hainsimsen-Buchenwald)    9110


you would require:


9110

where feature = '9110 - (Hainsimsen-Buchenwald)'or '9110 - 
(Hainsimsen-Buchenwald)(100.0%)' 



Note the single quotations for text.


An easier approach would be top calculate a new field using the field 
calculator and use the string left expression - left(/landclass field/, 4)



Kirk Schmidt

On 6/28/2023 9:52 AM, fabio castelli via QGIS-User wrote:

Dear Qgis users,

I kindly ask for your support with an issue related to the 
reclassification of attribute tables with the v.reclass function.
Here's the link to the question posted on Stackexchenge: 
https://gis.stackexchange.com/questions/462318/reclassify-field-values-from-txt-rule-file-in-qgis


Thank you and best regards,

Fabio Castelli


 
	Privo di virus.www.avast.com 
 




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Re: [Qgis-user] Qchainage plugin

[Kirk Schmidt via QGIS-User]

Hi Stewart:

You could write a simple script using python or modeler to do what you 
are looking for.  I would reproject to a UTM or similar projection and 
then the math for each segment gets easier.


Reach out to me privately as I have some ideas on how to implement it.

Kirk Schmidt

k...@nortekresources.com

On 3/30/2023 4:56 PM, Stewart Holt via QGIS-User wrote:

Tim,

Depending on how the GPS data was collected for the trail, your line 
shape may be longer than the actual trail. Each GPS point has some 
error and if the points were collected at one per second, the 
additional length caused by points being off the centerline, could be 
significant. GPS height is more noisy with error than the horizontal 
distance. That can contribute a lot of extra length. I use a sub-meter 
GNSS unit and filter the points to be no less than 10 feet apart. I 
add elevation from a USGS layer using the QGIS drape function because 
that is more accurate than the GPS height. By doing this, the 3D 
length is within about 1% as compared to a measuring wheel.


I made the earlier post for work I do for the Appalachian Trail. What 
I want is a way to calculate the 3D distance from one point to the 
next and put the running total in the M value of each point. In my 
case, the layers are in geo coordinates and would require the 
horizontal distance be calculated with lat/lon. I read the 
descriptions of every plugin and determined that nothing currently 
does what I wanted. I am a programmer but have very little Python 
experience. I did get one response which was helpful in writing 
plugins but have not yet pursued it. An example of a plugin which 
takes a vector layer input, does something (or nothing) with it and 
creates an output layer would be a good starting point. If I can 
achieve what I want to do, what you need would be a simple change.


Stewart Holt
Georgia Appalachian Trail Club


On Thu, Mar 30, 2023 at 3:10 PM Tim Fearn via QGIS-User 
 wrote:


Hi everyone,
I’m trying to use the qchainage plugin to create ½ mile markers
along a vector line that represents a trail.  The line is a single
feature with no multi-parts or dangles.  It is about 318 miles
long so I would expect right around 636 points if there is one
every half mile.  My project default is set to miles for length
measurements as is the qgis main preference. I set the unit
measurement to miles and input .5 as the interval.  I continually
get 771 points instead of the expected 636.  Also when I use the
automatic labeling feature of the plugin it appears to be in
degrees not an aggregate mileage.

     Several weeks ago a fellow had queried the list on the same
subject.  He was working with the Appalachian Trail I believe and
wanted to place points at given distances.  No one seemed to
really understand so I’m hoping that if anyone remembers the
original poster, and has come up with any thoughts or other ideas
it would be much appreciated.  This is something that can be done
for sure.  All of the National Scenic Trail maps in this country
are demarcated with some form of mile or half mile makers which
when labeled show the accumulated distance.

     Hoping for some traction on this.  I’ve only just started
learning python so I wouldn’t describe myself as a programer and
am looking for a relatively simple solution.

With much gratitude,

Tim Fearn
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Re: [Qgis-user] Shape Tools New Capabilities - Compass cardinal directions

[Kirk Schmidt via QGIS-User]

Nice Update Calvin.

What is your 0 or 360 degree reference?  I assume it is grid north if 
you use a projected coordinate system.


Kirk Schmidt

On 3/10/2023 8:04 AM, C Hamilton via QGIS-User wrote:
I thought I would highlight a couple of updates to the Shape Tools 
plugin. For those who are not aware, Shape Tools has a measuring tool 
that not only includes the distance from point A to B, but also 
displays the azimuth from A to B and from B to A. It shows each 
segment with these features and the total distance. It also has a 
measurement layer algorithm that creates a new layer from a polygon or 
line layer with already styled measurements of the line segments.


The recent addition is to also include the compass cardinal directions 
such as N, S, E, W or NE, WSW, or NEbE depending on the number of 
compass points that are selected. This has to be enabled from 
Vector->Shape Tools->Settings and then look for "Points of the 
compass" and you can select None, 4, 8, 16, or 32. It defaults to None.


The other addition is a related expression function with some examples

st_compass( azimuth[, number_of_points, mode] )

st_compass(33) → 'NNE'
st_compass(33, 8) → 'NE'
st_compass(33, 32) → 'NEbN'
st_compass(33, 16,'full') → 'north-northeast'
st_compass(33, 32,'full') → 'northeast by north'
st_compass(33, 32,'trad') → 'Quarto di Greco verso Tramontana'

Enjoy,

Calvin

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Re: [Qgis-user] LIDAR

[Kirk Schmidt via QGIS-User]

Hi Allan:

One way is to combine the files into a super file which may not be an 
option due to size.  The other would be to find the total range of z 
values in your project area and set the min and max symbology for the Z 
attribute.  while using the attributes by ramp option.  You can save the 
style and use it for the remaining point clouds.


Kirk Schmidt

On 2/13/2023 11:49 PM, Allan Younger via QGIS-User wrote:

Hi everyone,
I have multiple Lidar downloaded las files, on opening find each has 
its individual range of levels.

How can I shade uniform levels?
 200m plus points in several of blocks.
Chrs
AY



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Re: [Qgis-user] Mapa de visibilidad

[Kirk Schmidt via QGIS-User]

Hi Sara:

It depends what you mean by automatically. You can create a static 
viewshed of one or several points and click on a location to see if any 
or all are visible.  If you want to select a point and do the 
calculation on the fly, that is a different process and would take a bit 
of thinking on how to implement it.


The Visibility Analysis plugin will give you the functionality I 
described first.


Kirk Schmidt


On 1/11/2023 10:06 AM, Sara Gómez Zaragozà via QGIS-User wrote:

Buenos días,

Mi nombre es Sara Gómez, y querría preguntarles sobre una cuestión 
relacionada con la aplicación del QGIS (versión 3.8 para MAC OS X 
Capitan 10.11.6). Para generar un mapa de cuencas visuales de 
determinados elementos del paisaje (en este caso, arte rupestre o 
yacimientos arqueológicos) es posible que el programa marcando un 
punto en el mapa nos pudiera marcar los elementos que se visualizan 
desde este punto de forma automática?


Gracias, un saludo


--
Kirk Schmidt, MScF, BScF, RPF
General Manager
Nortek Resource Solutions Inc.
26 Church Road
Sutherlands River, NS
B0K 1W0
Tel (902) 922.3607
Email:k...@nortekresources.com
Web:www.nortekresources.com
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Re: [Qgis-user] Issues with SAGA's tools

[Kirk Schmidt via Qgis-user]

Hi Lucas;

Try installing SAGA as a stand alone and run the tool.  I use this tool 
regularly and it works fine.


Kirk Schmidt

On 4/19/2022 8:58 AM, Lucas Pomares via Qgis-user wrote:


Hello,

I’m trying to use fill sinks tool (Wang & Liu) of SAGA in Qgis 
Toolbox. However, when the process ends the program fails and doesn´t 
generate the result layers. I´ve tried it using different versions of 
Qgis (3.16 , 3.20 and 3.24) but I couldn´t solve the problem. SAGA 
version is 7.8.2. I also tried to uninstall and reinstall the program 
and I didn´t achieve.


I tried to solve it by myself but I don´t know where is the problem 
and would want to ask if anyone knows how to solve it.


I attach a picture of the fail and the log file in txt.

In English says that:

The following layers doesn´t generate correctly.

• 
C:/Users/Lucas/AppData/Local/Temp/processing_vRdlpU/1ee9a17ddce54df9967efcee956d7b95/FDIR.sdat


• 
C:/Users/Lucas/AppData/Local/Temp/processing_vRdlpU/83bae0d547e5462290b9d6530fb03bf3/WSHED.sdat


• 
C:/Users/Lucas/AppData/Local/Temp/processing_vRdlpU/a7ad2897f43e4c7bbfff4898a4a2cc07/FILLED.sdat


You can look the << register message panel>> in main window of Qgis 
for more information about algorithm.


Thank for the help!!

*Lucas Pomares Zambrano*

*Dpto. Ingeniería*

GEOLÉN

Advertencia legal:

*GEOLEN INGENIERIA S.L.,*CON CIF B41954124 y domicilio social en C/ 
Séneca, 1  - Local 7 (Valencina de la Concepción) - Sevilla, le 
informa que es responsable del Tratamiento de datos de carácter 
personal, donde se incluyen sus datos, cuya finalidad es la Gestión de 
sus servicios, la relación administrativo-comercial o la relación con 
el personal a su cargo, que incluye o puede incluir el envío de 
documentación. Le informamos que podrá ejercer los derechos de acceso, 
rectificación, limitación del tratamiento y portabilidad de sus datos 
personales en la dirección indicada mediante escrito, concretando su 
solicitud y al que acompañe fotocopia de su Documento Nacional de 
Identidad. El envío de este email responde con la totalidad de la 
legislación vigente en materia de protección de datos de carácter 
personal y Ley de Servicios de la Sociedad de la Información.



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--
Kirk Schmidt, MScF, BScF, RPF
General Manager
Nortek Resource Solutions Inc.
26 Church Road
Sutherlands River, NS
B0K 1W0
Tel (902) 922.3607
Email:k...@nortekresources.com
Web:www.nortekresources.com
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Re: [Qgis-user] shapefile import error

[Kirk Schmidt via Qgis-user]

Hi David

Just to Clarify Richards comments.  A shape file is a collection of 
files, all with the same prefix.  At a minimum, you should have 3 files, 
*.shp, *.shx and *.dbf.  There may also be a few more files as well 
depending on how the file was created.  You may just have the  *.shp 
file which is creating the error.


Kirk Schmidt

On 3/3/2022 3:24 PM, Richard Greenwood via Qgis-user wrote:

Do you have the "side car" files .shx and .dbf and possibly others?

On Thu, Mar 3, 2022 at 9:31 AM David Witton  wrote:

Hello

I'm pointing the Data source Manager|Vector at a .shp file and
getting the error "Invalid Data Source". The file exists on an
external drive, and the path is valid - any ideas on what could be
causing this?

-- 
David Witton

307 413 2072
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--
Richard W. Greenwood
www.greenwoodmap.com 

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--
Kirk Schmidt, MScF, BScF, RPF
General Manager
Nortek Resource Solutions Inc.
26 Church Road
Sutherlands River, NS
B0K 1W0
Tel (902) 922.3607
Email:k...@nortekresources.com
Web:www.nortekresources.com
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