Questions tagged [angles]
From Wikipedia: In geometry, an angle is the figure formed by two rays, called the sides of the angle, sharing a common endpoint, called the vertex of the angle. Angles are usually presumed to be in a Euclidean plane, but are also defined in non-Euclidean geometry.
116
questions
0
votes
0answers
13 views
Transform top-down vector layer to angled view
I have a 3D model of a fictitious city and I'm creating a little OpenStreetMap/Google Maps clone for it. The current workflow is fine: I render the fake satellite view pictures from a top-down ...
2
votes
1answer
35 views
Calculate angle between two 3D points [closed]
Given two points with xyz-coordinates, how to find the angle between them as shown in the picture. Is there a tool for it in ArcGIS Pro? I have looked into PointGeometry, but it did not seem to have ...
0
votes
1answer
23 views
sunAngle() calculation in R giving wrong results
I need to find the hourly sun angle (angle at which the sun strikes the Earth) for a particular position (latitude, longitude) for a given day in Belgium. I used sunAngle() from "oce" ...
2
votes
1answer
51 views
Calculating the angle of view from points to a polygon
This question Calculate field of view / angle of a point to a shapefile was attempting to achieve a similar outcome to my need (calculating the angle of view between observer locations and a polygon). ...
1
vote
1answer
65 views
QGIS 3.16 - Angles/Azimuth from advanced Digitizing in attribute table
I have simple question, how can i export angles from Advanced Digitizing Panel do attribute table? . For example , i want to draw a line of length 100m at angle -45 degree. I do it using advanced ...
0
votes
0answers
23 views
Convert GPS bearing to Cartesian angle
I have two GPS coordinates:
Location A 25.07507, 55.14012.
Location B 25.07571, 55.13975.
The bearing between location A and location B is 332.9°.
If we know that location A has a Cartesian point of ...
6
votes
1answer
158 views
Determining orientation of bay using QGIS
I want to know the orientation (relative to North) of a bay. The idea is, if I draw a line along a coast, and it crosses the bay mouth, I want the direction of the line perpendicular to that line (as ...
1
vote
1answer
29 views
Calculating angles of vector polylines
I would like to calculate the angles of my vector polylines (and later use this value to colour them, so all the similarly angled lines (i.e. that have the same orientation / have the same colours). ...
0
votes
0answers
16 views
ECEF position and velocity...how to calculate angle I am approaching the ground?
I have the ECEF position and velocity of an airborne object and need to calculate the angle the object is approaching the ground. (It is gliding in gently? Is it diving straight down? Is it swooping ...
2
votes
1answer
47 views
Measure an angle on an orthophoto or on a dense cloud
I'm currently working on QGIS 3..10.1, and I would to analyse my roof with UAV analysis. I have already made a dense cloud, an orthophoto and a DEM on agisoft metashape but now I would make few ...
4
votes
3answers
61 views
Angle of lines between two points varies between "90" and 270"
I have several sets of points on a layer, with all sets of points in nearly the same geographic location. I use the "points to paths" function and then explode the lines. I then use the ...
4
votes
2answers
550 views
Calculating interior angles of polygons or lines in QGIS
The problem
In QGIS, it's easy to calculate areas of polygons or lengths of lines using QGIS expressions with area ($geometry) / $area or length($geoemtry) / $length respectively. However, there is no ...
8
votes
5answers
376 views
Simplifying polygon by inner angle
I'm trying to simplify a polygon using the interior angle of a vertex as the "tolerance" instead of the distance between vertexes. E.g. the polygon in the image below would lose one vertex, ...
1
vote
0answers
169 views
Calculating azimuth angle from two X,Y,Z points
I'm following @whuber's post for calculating azimuth and elevation angles based on two vector3's. The elevation equation works great and gives me numbers that makes sense. I'm running into issues with ...
2
votes
1answer
115 views
Generalizing line with angle rules in QGIS
I'm looking for an automatic way to generalize/simplify vector lines in QGIS like the following picture :
I would like the generalization to include only the angles indicated by the small star on the ...
3
votes
1answer
105 views
Calculating average slope and compass point of polygons in QGIS 3.18
I am using QGIS to rank about 800 PV areas according to their potential. I have a vector (.shp) layer with certain areas in polygons (inc. attribute table, every polygon has it's own ID).
Now I would ...
2
votes
1answer
78 views
Angle from x axis with QGIS
I am using QGIS 3.10. I am trying to make an angle of line from x-axis in 0-180 range. This picture shows what I'm trying to do.
I want green lines to have angle of 140 for the upper one and -52 for ...
1
vote
2answers
48 views
Display angle of each line feature within a specific field for that layer using UpdateCursor method
So I want to calculate angles for each line feature layer using UpdateCursor method. So far I have progressed with the code but what it is doing is; it is giving the result of the last feature angle ...
0
votes
0answers
96 views
Finding the angle between two GIS linestring features using R
I have two simulated linestrings, one that represents a satellite ground-track and the other representing a linear surface feature (e.g., sea ice lead, road or river). I'm trying to determine how to ...
0
votes
0answers
22 views
Plotting polygon on map with length of sides known and lat lng known only for two vertices and no angles known
I have an image(a polygon), generated by survey department from a field survey. I know the lat lng of two vertices and the length of all sides.I do not know the size of the angles.(Using a protractor ...
4
votes
1answer
311 views
Calculating dominant angle of a polygon in QGIS without main_angle function
How can I calculate dominant angle of a polygon in QGIS without main_angle function?
I have a shapefile of Oriented Minimum Bounding Box rectangles (accessible from the following link: https://drive....
6
votes
1answer
5k views
Finding interior angles of a triangle using PyQGIS
I need interior angles of a triangle (QgsTriangle object). It has angles() method. There is an example in documentation. But sometimes the method doesn't give correct results I expect.
For example:
...
4
votes
1answer
245 views
Resizing rectangle by dragging one side and retaining all right angles using QGIS
I cannot resize a rectangle polygon feature in QGIS in a way that retains right angles on all the vertices.
There does seem to be an “intent” for this capability to exist via the “snap to common angle”...
1
vote
0answers
36 views
R statspat package (or similar pkg) and convert back to spatial objects
I've been testing the waters and doing some basic overview on the statspat package. This is a complex package and would likely require some serious effort to jump in and then get familiar with the ...
1
vote
0answers
35 views
Calculate angle of view from a point based on DEM using QGIS
I'm looking for a way to calculate the angle of view from a point on a DEM, in particular from the highest point of a terrain relief (corresponding to the red dot in this image below).
To better ...
1
vote
0answers
49 views
Calculating midpoint between every two closest points using ArcGIS Pro
I am looking to try and identify the midpoint between two closest points in my layer in ArcGIS Pro.
The reason being that I work in the utilities industry and I am trying to calculate the angle ...
3
votes
0answers
104 views
Setting vertical scan angles in visibility analysis (viewshed) QGIS?
Is it possible doing a visibility analysis (viewshed) in QGIS setting a vertical angle of search from the observer points?
In ArcGIS Pro viewshed, there are the vertical upper angle and vertical lower ...
1
vote
0answers
977 views
Compute elevation and azimuth from lat, lon, and altitude
Given the latitude, longitude and altitude of two points (in my case satellite and ground antenna) I would like to compute the azimuth and elevation angle between the two points from the ground ...
4
votes
1answer
210 views
What does the "bisector angle of vertex for original geometry" mean in the Extract Vertices tool?
I need to calculate the number of notches in my polygons.
Therefore I need to know the angles of the vertices in a set polygons.
I managed to extract a value for the angle by the Extract Vertices tool ...
1
vote
2answers
132 views
Gradians to degrees with zero
I want rotate symbol, but the angle is in gradians (grade, gon) with zero on east.
How to convert this angle to degrees with zero on north ?
I try (angle*0.9 + 90), but e.g. for angle with 380 gon => ...
0
votes
0answers
145 views
How can I calculate the course angle of two coordinates in decimal degrees?
I want to calculate course angle of two given decimal degrees, like shown in the following picture:
In the above picture the result would be 135°
The coordinates are given in decimal degrees, e.g. (...
1
vote
2answers
210 views
Converting radians to arithmetic degrees
I need to convert angles that are in radians from Due east to arithmetic degrees for
Creating arrows based on GPS velocities to show displacement
The Radians definition for my data is:
Degrees ...
4
votes
1answer
385 views
Calculating intersection angles of multiple polylines QGIS
I have one vector layer of multiple polylines that intersect each other in QGIS.
What I want to do: calculate all intersections angles (2-ray, 3-ray, 4-ray and 5-ray types) in this vector layer.
What ...
3
votes
1answer
200 views
Rotating Text -90 in QGIS Composer
I have rotated some text labels by -90 in my project. I want them to stand vertically on an alignment bar. If the map window with the alignment bar also has a rotation the text is no longer vertical ...
12
votes
2answers
576 views
QGIS - Rotating all symbols to face a single point
I am creating a map with airports, using an airplane symbology (svg).
Instead of having all small plane symbols turned north, I would like to rotate them to be all turned to Paris.
I have 28 airport ...
2
votes
0answers
253 views
Mistake in Oriented Minimum Bounding Box Tool? [closed]
I have used the OMBB (Oriented Minimum Bounding Box) Tool in QGIS to calculate OMBBs around polygons. However, there must be a mistake in the tool as all the yellow boxes in the picture below are ...
3
votes
1answer
1k views
Python: finding angle between 3 points while considering elevation
I have a pandas DataFrame that contains three points's lat/lon and elevation.
I used the Vincenty's formula to calculate the distance between each pair.
And now I want to calculate the angle of the ...
0
votes
0answers
116 views
PostGIS - Measuring the angle at the touching point of two lines
I want to calculate the angle of two lines of a routing network exactly at the "touching point" (the topological vertex).
My previous attempt was using the ST_ANGLE() function of PostGIS, which gave ...
0
votes
0answers
142 views
Compute polygons (Data Driven Pages) main angle when having ArcGIS Basic license
Is there a way we can calculate or when rotating polygons, actualize/update our "Angle" field in the attribute table by using Python? There is a tool in ArcGIS "calculate Polygon Main Angle" but is ...
1
vote
1answer
52 views
How can I calculate the maximum sky viewing angle for every point in a DEM not covered by objects? [closed]
I am looking for areas in a city that are suited for setting up precipitation measuring stations. One constraint is, that the station has to be distant from each object at least two times the object's ...
3
votes
2answers
3k views
Extract vertices QGIS 3
I am using Extract vertices in QGIS 3. The table in result shows angles. What do those angles mean?
7
votes
2answers
290 views
Distance to a ridge as function of angle (Python)
No success googling this for a while, but likely I just don't know correct terminology. Also, tell me if you see another exchange more suited for this.
Given:
A boolean 2-dim array that stores if a ...
1
vote
1answer
115 views
Getting angle of point generated from DEM in Raster using Field Calculator in ArcGIS Desktop?
I am trying to calculate the angle of some specific points generated from flow direction in ArcMap 10.2. I converted the DEM to flow direction and then to points. I am trying to convert the grid_code ...
1
vote
1answer
242 views
View Angle Calculation
In Calculating View Angle? the accepted answer contains the following calculations:
Given two points (x,y,z) and (x',y',z') in an earth-centered coordinate system, the vector from the first to the ...
11
votes
2answers
1k views
Creating line segments at point coordinates in QGIS
I have a point vector layer with "angle" field. How can I create line segments at these points with certain length and angle?
I did this with style options but I need this physically as ...
2
votes
1answer
893 views
QGIS Labels Rotation
I have imported some OS MasterMap data into QGIS 3.2 and have labelled the Cartographic Text dataset. This dataset has a rotation field, populated with various angles of rotation depending where they ...
3
votes
1answer
367 views
Differences in angle measurements in Web Mercator
I am trying to measure different angles on 2D map using lat/lon coordinates taken from Google Maps, and Java library JTS.
I have noticed a weird thing: my measurements are always distorted, except ...
0
votes
1answer
882 views
Finding internal angles of polygons using ArcGIS Desktop?
I'm working on ArcMap 10.3.1. I'd like to retrieve the values of all internal angles of each polygon of a shapefile, and return them as follows:
either concatenated on a new field;
or on a table;
...
-1
votes
1answer
95 views
Solar angle of Incident calculation confusion! [closed]
How can I deal with an angle of incidence with greater than 90 degree values if I am calculating solar radiation?
0
votes
1answer
91 views
Converting Angles in a File Geodatabase Table - via Field Calculator's Python
In a file geodatabase table, I have an attribute called 'NEAR_ANGLE' created via the "Generate Near Table" tool that I'd like to convert to a 0-360 degrees format. I've created an attribute called '...
