Questions tagged [algorithm]
A mathematical procedure used to solve problems with a series of steps. Algorithms are usually encoded as a sequence of computer commands.
585 questions
1 vote
1 answer
89 views
Calculate max number of points within a geographic area with a minimum distance
I read the similar question/answers: Seeking algorithm to place maximum number of points within constrained area at minimum spacing? However, it is more than a decade old, maybe something new evolved ...
- 55
0 votes
0 answers
46 views
Model Designer calculation saying nil input
In QGIS I'm seeking to use MD for a repeatable task. The other parts of the model have proven to be effective. The problem part of the model simply seeks to take a layer field (...
- 87
0 votes
1 answer
109 views
PYQGIS Processing Script - Add custom action to output layer
I wrote a processing script that creates a layer and adds it to the current project: class TestAlgorithm(QgsProcessingAlgorithm): def initAlgorithm(self, config=None): self.addParameter(...
- 193
1 vote
0 answers
65 views
ArcGIS Pro centroid calculation in a spherical coordinate system
I’m working with polygon features in ArcGIS Pro 3.1, and I’m using the "Calculate Geometry Attributes" tool to compute the centroid X and Y coordinates. How does ArcGIS Pro compute centroids ...
3 votes
0 answers
58 views
Activating/deactivating algorithms in QGIS Model designer
I often work in QGIS Model Designer to automate tasks s. It is often useful to deactivate part of the model when working with large models. I can deactivate as many algorithms as I want at the same ...
6 votes
1 answer
144 views
Cahill Conformal algorithm
I'm looking for the analytical Cahill (as in Cahill-Keyes) Conformal algorithm. I have found a JavaScript implementation but it wasn't well documented. The map that caught my eye was this. The links ...
- 221
0 votes
0 answers
30 views
Can Data Edition Number in DTED files be empty?
I have an algorithm that gets 3600x3600 elevation matrix from DTED2 files. I have encountered a problem when processing some of the files. It seems that Data Edition Number value in Data Set ...
- 1
0 votes
1 answer
44 views
Number of votes of final decision in a random forest Google Earth Engine
I am attempting to determine the number of votes that contribute to the final decision in the Google Earth Engine Random Forest algorithm. However, I am unsure how to obtain this information. Could ...
1 vote
2 answers
169 views
Algorithm to convert old map sheet number and grid refs to lat and long - Irish Ordnance Survey 1/2 inch maps [closed]
I have a list of 80 locations from an ecological survey in the early 1980s, and they are referenced by sheet number followed by 6 figure grid reference. The sheet numbers are of the Irish Ordnance ...
- 21
0 votes
1 answer
148 views
QGIS Graphical Modeler: "Send a Warning" / "Send a Message" Algorithms Not Displaying Messages
I'm working with the graphical modeler and noticed the algorithms: Send a Warning Send a Message I tried adding them to raise a message when the data is in the wrong format, but I can't figure out ...
- 1,027
0 votes
1 answer
130 views
How can I calculate the arrival time of a bus on a specific route?
I'm creating an app to track the location of buses in my city. My goal is to show in the app how long it will take for the next bus to arrive at a selected stop. Each bus follows a specific route, ...
0 votes
1 answer
106 views
How to save file in algorithm window in QGIS
When I was using the following hillside tool from the "processing" and wanted to save it (as shown as follows), this tool's window would close automatically after I clicked "save", ...
- 1
0 votes
1 answer
54 views
No result from algorithm r.stats in QGIS
I don't understand why algorithm r.stats doesn't give me result in the sidepanel (show result); the error is 'impossible open the file' What can I do to solve the problem? I show you: Versione di QGIS:...
1 vote
1 answer
128 views
Recursive model in QGIS
I needed to do an algorithm in the modeler and wanted to try (and also because I couldn't see any other solution) to make it recursive. Unfortunately, now every time I try to just open the model to ...
- 31
1 vote
0 answers
70 views
Set layer different style to multiple layer at once in model designer
I made a model that generates multiple layers Among other entries, a style file is required as input that I use to set one of the output layer. I would like to use a folder input and to set multiple ...
- 31