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.
138 questions
0 votes
0 answers
75 views
Find angle between two linear shape
My goal is to know the angle in the intersection points between two linear shape using Qgis. (In the picture some of the "seems to be" ok results of the following procedure with the angle ...
- 75
3 votes
1 answer
92 views
How compass bearings map to a Web Mercator projection
I'm trying to figure how compass bearings map onto a Web Mercator projected map, so I can draw a line in a specific bearing. Magnetic declination needs to be taken into account, but since in Web ...
- 133
1 vote
0 answers
60 views
Deriving subtended angle in QGIS
Is there a tool to calculate the subtended angle between an observer & observed point(s)? I've searched on "angle" and generally hunted, but not found anything.
- 619
0 votes
0 answers
180 views
Trying to find zenith and azimuth angles to satellite
I am working with satellite data. Each scene is approximately 30km squared with 1024 * 1000 pixels. I have the zenith and azimuth angle for each of the four corners, plus the center. I have latitude ...
- 138
2 votes
1 answer
205 views
Creating tangential lines at points along shoreline in QGIS
I want to create tangential lines for each point along a shoreline in QGIS, such as the dashed line I've hand-drawn. These points are not randomly spaced, they each represent the angle at which each ...
- 21
4 votes
1 answer
248 views
Offset QGIS label for vector field markers, rotate and anchor them so they are fixed regardless of scale
Working in QGIS 3.34.3 Prizren and have a points layer visualized as 2 blue vector field marker arrows (visualized by angles called angle rbear & lbear respectively). The grey arrow is the 3rd VFM ...
-1 votes
1 answer
44 views
What is "ANGLE" in an ArcGIS.com ADDRESS_POINTS table?
Starting at e.g., https://gisdata-dupage.opendata.arcgis.com/datasets/address-points/explore how does the user find what the ANGLE (type: esriFieldTypeDouble, ...) field represents? Angle measured ...
- 756
2 votes
0 answers
104 views
How to determine apex / angular points in QGIS-3
How could I find the apices / angular / turning points of a linestring in QGIS3? The logic behind that should be to determine consecutive segments with same direction (always right or always left), ...
- 1,894
3 votes
2 answers
283 views
Calculating main_angle of polygons using PyQGIS
According to Calculating Polygon Main Angle using QGIS, it is possible to find the main_angle of a polygon by using a field expression like: main_angle($geometry) Can this function be called using ...
- 575
3 votes
1 answer
318 views
Labelling line with angles from 0º to 360º in QGIS
Labelling lines with the following function: round(degrees(atan2(yat(-1)-yat(0), xat(-1)-xat(0))), 1) || ' º' As you can see in the screenshot, this expression calculates the orientation angle of the ...
- 2,676
5 votes
1 answer
272 views
Rotating features with multiple geometries in one layer using PyQGIS
I have a layer containing several small square geometries in QGIS. I want to tilt these ones by one to the same angle. So I wrote the following Python code for that, but it does not work properly. ...
- 51
5 votes
2 answers
392 views
Create line-type symbology perpendicular to a segment in QGIS
I want to create a symbology (line type) for a point layer in QGIS. This line must be perpendicular to the segments of a polygon. I attach an image: To do this I entered an expression in the rotation ...
- 53
0 votes
1 answer
98 views
Line geometries thematized by graduated size according median length and angled by median angle
I would like to find a dynamic method, using a Geometry Generator expression, to draw a categorized lines geometries from a range values of lines angles I try to expose the initial state of the lines ...
- 1,162
0 votes
3 answers
299 views
Create raster with angles between single point and all raster pixels in QGIS [duplicate]
I would like to create a raster in which the cell values contain the angle between that cell and a single vector point. It would be as though a line were projected between the cell and the point, and ...
- 77
5 votes
1 answer
289 views
Why angleAtVertex() returns different value than angle_at_vertex in Field Calculator using PyQGIS
When using angle_at_vertex($geometry,0) 324.022 in the Field Calculator of QGIS the values seem correct from a visual check. However when using feature.geometry().angleAtVertex(0) 5.616644978134382 ...
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