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.
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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 ...
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18 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 ...
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16 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
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1answer
135 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....
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1answer
2k 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:
...
2
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1answer
52 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”...
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20 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 ...
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0answers
19 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 ...
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0answers
26 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 ...
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0answers
75 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 ...
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0answers
498 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 ...
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1answer
95 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 ...
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2answers
79 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 => ...
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0answers
70 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. (...
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2answers
135 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 ...
3
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1answer
210 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
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1answer
125 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 ...
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2answers
515 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
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0answers
189 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
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1answer
692 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 ...
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0answers
59 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 ...
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0answers
102 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 ...
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1answer
45 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 ...
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2answers
1k views
Extract vertices QGIS 3
I am using Extract vertices in QGIS 3. The table in result shows angles. What do those angles mean?
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2answers
255 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 ...
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1answer
89 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 ...
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1answer
166 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 ...
2
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1answer
647 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
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1answer
294 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 ...
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1answer
692 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
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1answer
87 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?
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1answer
69 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 '...
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1answer
166 views
Compute difference in lon / lat when moving at angle
I have the following problem: I have been given an origin as a lon / lat pair, a distance in kilometers and an angle on the ground, relative to the cardinal directions. My goal is to compute the ...
3
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1answer
577 views
Advanced Digitizing Panel angle units
I have QGIS 2.18.3 installed. I'm trying to change angle units from degrees to Gon/gradians (90 degrees = 100 Gon).
I navigated to Settings--> Options --> Map Tools --> Preferred angle units, and ...
2
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3answers
938 views
Calculate Polygon Main Angle in QGIS with Python
At the moment I have split my imported shapefile into the parts with the function 'qgis: explode' (pic1 & pic2):
Next I want to the polygon main angle of each "exploded" element.
In ArcGIS there ...
0
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2answers
655 views
tool to output xy from an input xy, distant, and angle [closed]
I want to build a tool where you provide coordinates, distance, and angle for input and it outputs coordinates, no feature necessary, using the distance and angle from the input coordinates.
How do ...
3
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0answers
72 views
Given a line find whether another line is along side, N,E,S,W or not
I have a shapefile representing roads (Black) and I need to know whether another line object (Red) is to the side of it. Including the orientation between them, to define whether the Red line lies to ...
2
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2answers
389 views
Determining angle for polyline geometries that share a point
With help I've written code to determine the angle between two line geometries. However, the code assumes each line extends into infinity and doesn't account for the shared point. Thus an angle of 150 ...
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1answer
8k views
Find angle between two lines features that share a point
I'm trying to write a script that will find angles between polyline features. the polyline features always contain only two points (start and end).
A few sources indicates that the declination of a ...
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0answers
107 views
Seeking equation/algorithm for angle between straight line and grid north?
I have a cylindrical equidistant projection map containing climate data(equal angle and equal distances). On this projection I have a straight line connecting two latitude and longitude points.
How ...
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1answer
248 views
Determining orientation angle of each street on dataset in ArcGIS Desktop?
I am trying to join centerline attributes to a blockface shapefile using the "near" tool. The problem is that on many streets, the tool gets confused because of intersections and varying width. My ...
2
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0answers
605 views
How to calculate angle between two points and vertical [duplicate]
Is there an easy method to calculate angle between two points and vertical with PyQGIS ?
In QGIS I use Cad-Tools extension, I select two points and it give me an azimuth. Now I would like to do the ...
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0answers
78 views
How I can find raster angle in ArcGIS
I have a raster layer in ArcGIS with specific extent. How can I be able to find the angle of this raster frame? Because I create fishnet but it is like a rectangular area and does not match to ...
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1answer
65 views
Extract angle of valley walls on both sides
I have a DEM of a the bedrock surface beneath a glacier and what I want to do is subtract the mean angle of the valley walls on the left and right side of the glacier along this line. I have a line ...
2
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1answer
401 views
Generating new point file based on specified distances and azimuths/angles from previous point in ArcMap?
I have a shapefile of multiple points (upwards of 100). I would like to generate a new shapefile with points that are a specified distance and direction away from the previous points. For example, ...
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0answers
32 views
How can I create polygons that are on the edge of point data and angle the polygons based on numerical angle data generated from flow direction?
ArcGIS 3D Analyst 10.5.0.
I have a set of well locations and I would like to define the groundwater capture zone based on the groundwater velocity and the direction of flow. I calculated flow ...
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1answer
353 views
What is the meaning of this linear scale of angles on this 1951 map of Iceland from the U. S. Army Map Service (AMS C762)?
On the U.S. Army Map Service (AMS C762) 1:50,000 maps made of Iceland 1948–1951, there is a scale marking at the top which shows degrees, I suspect angles. In the image below it shows 25°–29°. It ...
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1answer
266 views
MBG_Orientation: ranges from 0-180, instead of 0-360? (ArcGIS, Minimal Bounding Geometry)
I'm trying to understand the concept of the Orientation of the Minimal Bounding Geometry: Minimum Bounding Geometry (Data Management toolbox, ArcGIS Desktop 10.1).
I run the tool Minimal Bounding ...
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0answers
51 views
How to move node position keeping right angles?
I made a polygon with perpendicular segments using CAD Tools. I saw that, even if the segments of this polygon are perpendicular, the four points has different values in terms of x, y. I think that`s ...
2
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1answer
148 views
Rotation symbol in ArcGIS online not always available?
I'm currently making an application with Survey123 and ArcGIS online. This application uses the survey to add ratings on 9 subjects. The added points are loaded into an webmap in ArcGIS Online which ...
