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.

Filter by
Sorted by
Tagged with
1
vote
0answers
20 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 ...
4
votes
1answer
1k views

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 ...
0
votes
0answers
44 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 ...
0
votes
0answers
11 views

Calculate per pixel Landsat Relative Azimuth Angle (RAA)

Iam Trying to Generate Landsat-8/OLI NBAR images. Given that USGS Landsat-8 Angtool can generate per pixel view_zenith, view_azimuth, sun_zenith and sun_azimuth angle bands. Is Relative Azimuth Angle ...
0
votes
0answers
30 views

Calculate per pixel Sentinel-2 Solar and Sensor Angle Views

I am working with Sentinel-2 images and would like to generate per pixel angle bands (view_zenith, view_azimuth, sun_zenith and sun_azimuth). Considering Sentinel-2 SAFE structure, I found that ...
5
votes
1answer
126 views

Relative position of nodes

I am studying bird movements and have tracked their locations, ie from flower 1 to flower 2 to flower 3 etc. Each point is mapped out. I am trying to work out the relative direction for each movement ...
6
votes
1answer
15k views

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. ...
1
vote
1answer
38 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 ...
1
vote
2answers
162 views

Extract vertices QGIS 3

I am using Extract vertices in QGIS 3. The table in result shows angles. What do those angles mean?
6
votes
4answers
945 views

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 ...
7
votes
2answers
99 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
49 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
82 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 ...
1
vote
1answer
249 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
167 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
57 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 ...
0
votes
1answer
325 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; ...
5
votes
1answer
564 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. ...
-1
votes
1answer
69 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
57 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 '...
1
vote
0answers
46 views

ArcGIS: fishnet with rotation angle and coordinates error [duplicate]

I have a micro plots map shapefile with NDVI data. I want to create a fishnet of polygons to divide the map into the micro plots. I have being able to create a fishnet with polygons but I cannot place ...
3
votes
1answer
312 views

Calculate shortest distance from point to polygon according angle table

I have a point in polygon. I want to have new polyline shapefile, which will show the shortest distance from the point to polygon edge, according to given angles in the table.
0
votes
1answer
107 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 ...
2
votes
2answers
1k views

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 ...
3
votes
1answer
384 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 ...
1
vote
2answers
448 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
votes
2answers
99 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
votes
0answers
67 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 ...
0
votes
1answer
191 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
votes
2answers
246 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 ...
0
votes
1answer
4k 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 ...
1
vote
0answers
85 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 ...
3
votes
1answer
4k views

What are the main drawbacks of the AuthaGraph projection?

The AuthaGraph projection has recently been hyped as the "perfect projection" for a world map, since it (approximately) conserves area, shape and distances. It also tessellates, so that any point can ...
2
votes
0answers
338 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 ...
1
vote
0answers
50 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 ...
2
votes
1answer
199 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, ...
1
vote
0answers
28 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 ...
14
votes
1answer
280 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 ...
1
vote
1answer
172 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 ...
3
votes
1answer
243 views

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 ...
1
vote
0answers
41 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
votes
1answer
106 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 ...
1
vote
0answers
100 views

Calculation appropriate angular step depth in depthmapX

I am a new depthmapX user in which trying to calculate segment step depth from specific segment to store cumulative angles for each segment. Is there anyone who can provide advice to implement it? ...
2
votes
0answers
121 views

How to calculate cumulative angles on specific routes?

I am using Network Analyst extension in ArcGIS 10.4 (Windows 10 Pro 64bit) to calculate accumulative angles from Node 1 to Node 423 on the shortest path as shown in the left side of Figure 1. Network ...
7
votes
1answer
2k views

Is there a way to interactively rotate labels in QGIS using any of the edit tools? [duplicate]

I seem to have put too much detailed information in my previous question, confusing the masses. My apologies. Let me try again from a different angle. I want to rotate labels interactively/visually,...
4
votes
2answers
1k views

How can I calculate the coordinates of a point on the intersection of two parallel lines with a bisecting line with pyQGIS? [closed]

I am building some sort of homemade pyQGIS-Buffer-tool as the existing flat-end-buffer-tools are not working for me ( see v.distance.buffer does not create proper buffers with flat endcaps) Therefore ...
1
vote
2answers
66 views

Getting existing rotational value in QGIS?

I have one DXF file for and I loaded in QGIS canvas. In attribute table I did not found any angle for label. How can we know the existing angle in which the label displayed?
0
votes
0answers
406 views

Calculate Polygon Angle of Rotation about the centroid

I have a collection of polygon geometries in a projected spatial reference. How can I figure out each polygon's angle of rotation about the centroid? I am using Python (2 or 3 doesn't matter) to ...
2
votes
0answers
173 views

Radar incidence angle of different images [closed]

I am beginning in radar traitement, I want to know if working with radar image with differents incidence angle is not correct for result, Could the radar image have the same incidence angle for ...
3
votes
1answer
684 views

In QGIS, how to get an angle of a polygon / get longest line in polygon and angle of that line? [duplicate]

I am using QGIS to output data to a game engine, I use polygon centroids to find center points of polygons of houses to output to the game engine for house placement - now I'd like to take it one step ...