Re: [Qgis-user] Problem with contour algorithm

2024-03-13 Thread kirk via QGIS-User
Hi Grant.Check to make sure your destination directory actually exists and you have write permission.  I seem to remember running into a similar issue but I am not close to a computer to test. Kirk SchmidtSent from my Galaxy Original message From: Grant Boxer via QGIS-User

Re: [Qgis-user] How to Change Layer coordinate fields

2024-01-24 Thread kirk via QGIS-User
Hi Alana.You cannot edit the csv file, however, you can save it as a shapefile or other vector format.  You can choose the  coordinate system you want the data to reside in when you save it.Load the newly minted vector file snd you can recalculate or add new coordinate fields if required,

Re: [Qgis-user] building gdal for mrsid

2024-01-21 Thread kirk via QGIS-User
Hi Don..Did you download the SDK from lizardtech?Kirk Schmidt Sent from my Galaxy Original message From: Don Harter via QGIS-User Date: 2024-01-20 10:10 p.m. (GMT-04:00) To: qgis-user@lists.osgeo.org Subject: [Qgis-user] building gdal for mrsid I have been following

Re: [Qgis-user] Calculate upslope catchment areas for multiple points?

2024-01-14 Thread kirk via QGIS-User
Hi Ben.The python script should work in your version since it is written in python 3.  It us,a relatively simple routine which iterates over each sample point and rund the saga tool.  It nay take a while to run 100s of points but it should finish.Saga is a third party, open source software

Re: [Qgis-user] intersection question

2023-11-12 Thread kirk via QGIS-User
Hi Matt.The trick is to use the attributes to id each layer before you run the intersection. So create a new field for each layer and give each polygon the same number. So layer 1, maybe 1.  Do the same for the second or even third layer, use 2, or something different from the first layer. 

Re: [Qgis-user] Editing expression in QGIS

2023-07-10 Thread kirk via QGIS-User
The short answer is yes.  You will need all the formula variables within the feature table.  Your syntax will change with ield names replaceing cell references.  You can copy your final expression and save as a text file for future use.  Alternatively, you can write a simple python script or

Re: [Qgis-user] Palm Counting using QGIS

2023-06-06 Thread kirk via QGIS-User
Trim, Co Meath, C15 NX36 —— M +353 87 688 5964 T +353 46 942 2409 https://https://gov.ie/opw —— Email Disclaimer: https://www.gov.ie/en/organisation-information/439daf-email-disclaimer/ From: QGIS-User On Behalf Of kirk via QGIS-User Sent: 01 June 2023 10:58 To: Loke Jian Munn ; qgis-

[Qgis-user] (no subject)

2023-06-06 Thread kirk via QGIS-User
Hi LokeRichard suggested using a NDVI approach which would require data in the Near Infrared (NIR) band.  An orthomisaic would contain 3 colour bands, but not the NIR.  NDVI provides an understanding of plant greenness and health and may not be suitable for detecting oil palm's.  If you are

Re: [Qgis-user] How to calculate the visible area of a viewshed?

2023-06-03 Thread kirk via QGIS-User
Hi David.Here is a link to a tutorial on viewshed analysis;https://dges.carleton.ca/CUOSGwiki/index.php/Conducting_a_Viewshed_Analysis_in_QGISKirk SchmidtSent from my Galaxy Original message From: david cebrian via QGIS-User Date: 2023-06-03 12:51 a.m. (GMT-04:00) To:

Re: [Qgis-user] Palm Counting using QGIS

2023-06-01 Thread kirk via QGIS-User
Hi Loke.A couple of comments.  1) The 95 % success rate is very good.  If you were to have a close look at the missed trees you may realize that the highest point on a particular palm tree is lower than the neighboring tree or palm frond. What ever algorithm you use, you are limited by the

Re: [Qgis-user] 3D Moon models with QGIS

2023-05-06 Thread kirk via QGIS-User
Hi MeganThanks for the interesting question and link. Yes QGIS gas the tools to complete this analysis.First generate a slope raster from your dem.  You can use the slope tool in the Processing Toolbox>raster terrain analysis folder.The result will be a raster with the slopes of your study

Re: [Qgis-user] Azimuth and orientation of 2 features

2023-02-12 Thread kirk via QGIS-User
Hi Alex.You could use the coordinate of the centrists to determine which polygon is east or north.   For example, if your coordinate system is utm.  the centroid with the highe Easton will he the most easterly, the one with the smallest northing will be the most southerly.Kirk Schmidt Sent from

Re: [Qgis-user] CSV layer, Time column null expressie to test for NULL/empty?

2023-01-19 Thread kirk via QGIS-User
You can also useCASEWhen field is null then 123else 321endKirk SchmidtSent from my Galaxy Original message From: Richard Duivenvoorde via QGIS-User Date: 2023-01-18 1:44 p.m. (GMT-04:00) To: qgis-user@lists.osgeo.org Subject: Re: [Qgis-user] CSV layer, Time column null

Re: [Qgis-user] Airborne camera rectification

2022-12-30 Thread kirk via QGIS-User
Hi Scott. A couple of technical points to consider:What is the accuracy of the imu on the camera?  0.1 degrees at 30 km results in a lot of error.  Do you have the interior orientation of the camera? This is the lens distortion which makes up a critical part if the orthorectification

Re: [Qgis-user] SQL query in a QGIS model

2022-12-03 Thread kirk via Qgis-user
Good Day.Try dropping the @ as you are using field values and not variables.  If the were variables, then would show up with @ in the list.Kirk SchmidtSent from my Galaxy Original message From: ALT SHN via Qgis-user Date: 2022-12-03 5:26 a.m. (GMT-04:00) To:

Re: [Qgis-user] large DEM not loading tiles correctly

2022-09-28 Thread kirk via Qgis-user
Perhaps you can consolidate small groups of tiles into single rasters.  Kirk SchmidtSent from my Galaxy Original message From: "Michael.Dodd via Qgis-user" Date: 2022-09-28 1:32 p.m. (GMT+01:00) To: "'qgis-user@lists.osgeo.org'" Subject: [Qgis-user] large DEM not loading

Re: [Qgis-user] Symbology

2022-06-18 Thread kirk via Qgis-user
If the data is being read as a character versus a integer or decimal, you cannot use graduated symbols. Double left click on the layer in the legend and select properties. Select the Fields tab and see what format the attributes are being read as.  I have run into this when generating a csv

Re: [Qgis-user] How to make joined fields editable?

2022-05-15 Thread kirk via Qgis-user
Hi Roland I have not tried that checkbox bug just save your joined layer and you can edit the resultant file. Kirk SchmidtSent from my Galaxy Original message From: Roland Berger via Qgis-user Date: 2022-05-15 5:25 a.m. (GMT-04:00) To: qgis-user@lists.osgeo.org Subject:

Re: [Qgis-user] How to convert depth belw ground level to depth below mean sea level in QGIS

2022-05-03 Thread kirk via Qgis-user
Hi NavneetThis is  classic raster analysis.  You will need the corresponding Digital Elevation File (DEM).  If your water table data are in vector fomat, you will have to rasterize the data, preferably to the same resolution as the dem.  Then you can use the grid calculator to subtract the

Re: [Qgis-user] creating vector layer from slope map with few classes

2022-03-29 Thread kirk via Qgis-user
Hi Maria.The symbology does not reclassify the underlying raster, it just changes the way it is displayed.  Use the raster calculator to generate a new raster with the Classes you require. The native qgis calculator works well. You can find it in the upper word menu under raster.  Once  you