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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Angle at intersection point from two Lines

I would like to find the angle of two lines at their intersection point. In my opinion it is the azimuth I'm looking for, right? So I'm using Python with shapely for finding the intersection and ...
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Rotate feature by angle (QGIS)

Trying to offset a line by 10 degrees, rotating around an endpoint. I've read up on the older plugins and the new Rotate Feature tool, but am having trouble. I am using QGIS 2.8.9 Wien, reinstalled ...
187 views

Are perpendicular lines still perpendicular after converting from UTM zone 15 to 16 (or between two neighboring zones)?

I want to convert a square polygon that is close to the edge of UTM zones 15N and 16N. The polygon's coordinates are in UTM 16N, but it is spatially positioned in the UTM15 area. My question is that ...
563 views

Setting Data Driven Pages rotation when index has extra page polygons edited into it?

I have created an index to use with data drive pages. I used strip map index and then altered the geometry of the index polygons to better fit my project area. I also added additional index polygons. ...
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Point-Line shortest distance and corresponding angle using FME

I want to determine the shortest distance and especially the corresponding angle from a point to a polyline. A solution using FME would be strongly preferred.
807 views

Drawing a triangle with specific angle and arm lengths

I have to draw a triangle with an angle of 37 degrees, with the 2 sides forming that angle being 250m. I cannot figure out how to do this in ArcMap without hand-drawing it. This seems relatively basic ...
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How to measure angle in QGIS

While measuring an angle in QGIS using measure angle tool, it is showing as 0 to 180 degree for clockwise direction and -1 to -179 for anticlockwise. What I need is, interior angle between vertices of ...
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How to get around “The field is not nullable” error?

I have a shapefile of lines. I want the angle of every line calculated in a field. I am using the script below in arcmap, but when it encounters a line that is horizontal, it stops calculating any ...
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Find lower left corner of a rotated polygon

I am currently struggling with a mathematical problem and can't seem to get it solved. I have a bunch of rotated rectangular polygons (solution should also work for non-rectangular polygons) in ...
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Get look angle at a specific coordinate on a SAR image

Can we get the look angle of the SAR sensor on a large image for a given coordinate, if we only have the look angle in the mid-swath (or the near-range & far-range angles)? Do we get the look ...
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creating a right angled rectangle on google maps from a line

I have an application where the user draws a line, then automatically the software should create a rectangle where the line intersects the midpoint of two adjacent sides of a right angled rectangle. ...
833 views

Why does the resolution decrease with increasing incidence angle in the Sentinel-1 SAR sattelite

On this link (Sentinel1 webpage for a SLC product), the resolution is written as a range from the highest corresponding to low incidence angle, to the lowest resolution corresponding to high incidence ...
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Fishnet rotation angle creation problem?

I have created a grid of width 67.056 and height 60.3504 making the boundary mark as a template extent. But its straight grid while i want its to rotate around -1.3 degree. Till here the size of the ...
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Determining the cosine of the angles between two lines using dot product

SCENARIO:I have a certain buffered region (lets say a one way road segment), which will have only one allowed direction represented by vector A. And, there are several other lines which may or may not ...
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Graphic Layer graphics redraw incorrectly after map zoom event

I have a web map application which adds arrows onto street segments signifying direction as a Graphics Layer. The direction of each arrow is calculated by this process: 1) build an array of the street ...
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How to find intersections of lines less than 45° in FME

I'm trying to identify intersections of electrical transmission lines that are less than 45° in FME. While, in theory, this doesn't seem like such a daunting task, in practice, it's proving quite ...
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Measuring Angle of two Points from North in ArcGIS 10.3 C# SDK

What is the most reliable method to calculate angle of a line from north, defined by it’s from and to points? I used to use IMeasurementTool interface found in defense solutions namespace found in ...
434 views

Rotate symbol base on polyline angle

I am using AcadMap to bring in .shp files for polylines. I have AutoCAD tickmark block at midpoint but it is at 0 degrees (straight up). Is there any way to rotate block angle to match polyline ...
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Computing the elevation angle of a GPS satellite with respect to the given receiver location

can anyone source an explicit formula for calculating the elevation angle for a GPS satellite as seen from a receiver. I can't seem to find one. Even a text reference would be great. I couldn't quite ...
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How to filter LiDAR data by scan angle?

I am looking to filter LiDAR data (.las format) by scan angle specifications (e.g. keep all points < 15). From a basic Google search, it appears that the libLAS library has the ability to filter by ...
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Calculate actual Landsat image corner coordinates to derive azimuth (heading)

This is the continuation of an unsolved problem I had (see this thread if you like). I have a Landsat image and I would like to estimate the satellite azimuth for my location. As the satellite follows ...
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Estimating Landsat 7 azimuth (heading)?

I am trying to understand if the Landsat 7 satellite ETM+ orbit has any significant azimuth or if it could be assumed as 0° (as it is not a pointable sensor). I searched in the web but could not find ...
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Calculate field of view / angle of a point to a shapefile

I am trying to automate a calculation of the blocked fraction of a field of view from a point to a shapefile. I.e. find α in , such that α / 360 gives me the fraction of the field of view covered by ...
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Calculating View Angle?

I am looking for the most accurate way of calculating the view angle (Azimuth, Elevation) from a reference point (my location) A to another point B. I have the Lat, Lon, and Altitude for each point. ...
7k views

Calculating angle between two points (according to reference point)?

I need to calculate the angles between two points on ArcGIS. I have ArcInfo License, too. I have 5 points on a diagram. One of them is my reference point. The other four creates angles between each ...
322 views

How to digitize 90 degree angles? [duplicate]

Possible Duplicate: How to create polygons with straight lines and right angles in QGIS? In QGIS 1.8 is there a way to digitize buildings etc. with perfect 90-degree angles, Or, edit a polygon ...