Questions tagged [direction]

The distance-independent relationship between two points in space that specifies the angular position of either with respect to the other

32 questions with no upvoted or accepted answers
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491 views

How to deal with direction in pgr_ksp (K shortest path)?

I am working on an Android app for navigation with PostGIS and pgrouting. I have implemented pgr_dijkstra and it's working fine. I am not considering direction in routing at this point and just want ...
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73 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 ...
3
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0answers
3k views

Arrow flow lines from a contour map

using QGIS (or even GRASS) is it possible to label a contour lines shape with arrows that indicate the flow direction? Briefly: I have a point shape with elevation values. I make an interpolation map ...
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30 views

Extracting specific corner of a rectangular polygon based on the cardinal direction

I have a dataset of rectangular polygons that have an arbitrary cardinal direction attribute (N, E, S, or W) assigned during digitization. The polygons aren't necessarily exactly rectangular. I want ...
2
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0answers
34 views

Naming convention for ways of defining direction

The following two conventions for defining direction are very common, but what are they called? 0 at north, clockwise 0 at positive x-axis, counterclockwise Background: I'm writing a function that ...
2
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0answers
23 views

Creating vector gradiants showing magnitude and direction by taking input of two rasters in QGIS

I have two binary rasters and I am focusing on pixels having value 1. Now, I want to know show direction and intensity from which pixels (having value 1) of one raster is shifted other raster. ...
2
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0answers
29 views

Using ArcGIS API for JavaScript 3,X Directions widget?

Can I select only one country in the Directions widget in ArcGIS API for JavaScript 3,X? For example: I want to select only UK. If the user writes Spain he will find nothing.
2
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0answers
756 views

R Leaflet plot ship direction

I want to plot ships and its direction on the map using R Leaflet. I tried to represent a ship as a circle and its direction with a line from the center as in the following picture. The problem is ...
2
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0answers
171 views

Why this pyqgis code cause crash dump in QGIS?

In ArcGIS there is gp.EucDirection to calculate Euclidean allocation, distance, and direction around a point, Is there equivalent function in pyqgis or gdal? I wrote a script with help of gene and ...
2
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0answers
175 views

Make a line from a set of GPS points close to a specific GPS point with PostGIS

I have to develop a map-matching algorithm. At the moment I only match GPS points with the closest road segment. I'm looking for a way to compare the directions between a GPS point and a road to ...
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27 views

Is it possible to find the water flow direction in distribution pipes of a city with GIS?

I am trying to figure out how to find the direction that water flows based on the location of the water treatment plant, storage tanks around the city, and the size of the pipes. I want to see which ...
1
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1answer
173 views

PostGIS: How to find Nearest Neighbour but only within a direction range?

I am attempting to find the nearest neighbour to a geometry in a certain direction but am becoming stuck at the planning stage. I understand the basic tools that I need but am failing to find anything ...
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30 views

Finding Segment information on a Route between 2 places

Is there a way to find Segment information on a Route between 2 places using Google Maps API? I have 2 places/addresses/latlong. I am looking for the direction between the two. For this direction, I ...
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97 views

Computing mean direction of river network in R

I have a shapefile of a section of river network (polyline) which I have read into R using the sp package to have a SpatialLinesDataFrame. I also have access to a terrain raster for the region in ...
1
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0answers
153 views

Directions based on polygon centroid and average/median point of adjacent polygon's touching border

I have a layer containing multiple polygons, and I am trying to find a way to identify the directions of the adjacent polygons of a certain polygon. The directions would be based on the main polygon ...
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0answers
697 views

JSTS Buffered Polyline in route Service (google maps V3)

I do not know if someone has already lived the same thing as me, I work with JSTS API to create a polygon that surrounds the route of the google services but the problem is that when there are ...
1
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0answers
33 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 ...
1
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0answers
70 views

Compare distributions of point patterns for significant differences in clustering

My problem is I have tens of thousands of points (GPS) representing animal locations over a period of several months. I want to test if a portion of those points (only about a few hundred) which ...
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0answers
66 views

How find a given point is with in given distance to a route get from google map direction service

I have created a route with start point, end point and the optional stops points. I have to check if the given point is away with in a given distance from the route. I have to match the given points ...
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0answers
589 views

Finding location points where travel angle changes using R?

I want to use R to find out the point locations at which my vehicle (equiped with GPS) started to turn. The data contains coordinates and time information. I have sort my data based on time sequence: ...
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1k views

How to determine ring orientation from lat/long coordinate points?

We have some set of point coordinates in lat/long which contribute to a polygon. From this set how do we determine the polygon is clockwise or anticlockwise?
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181 views

How to indicate a change in transport mode for directions in a multimodal dataset

When I solve a route and generate directions for my multimodal dataset, the end product is not very user friendly: The pedestrian started walking along Main Street and then boarded a bus to travel ...
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0answers
922 views

Avoid backtracking while creating loop in Google Map API 3

I am trying to build a solution where i would create loop by google map. My first and only business rule is there should not be any repeated route. But with my demo http://www.mindcrew.in/road%...
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19 views

Why the wind shows the opposite direction than what it should display

I am having trouble with my wind display, I am currently using GrADS and I have two data from AMPS and ERA5 showing the wind speed and magnitude over the Antarctic Peninsula area. However, after ...
0
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0answers
27 views

Counting lines in polygon using ArcGIS Pro

I want to determine how many lines go in which direction (north, east, west, south). Is there a simple way to do that in ArcGIS Pro? Unfortunately, I have too many lines to count them all by myself. I ...
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25 views

Identify incorrect direction of travel of Polyline

I was trying to work on a simple way to identify incorrect direction of travel of polyline as compared to base map. However was unsuccessful. I tried few plugins but didnt get anything to help me with ...
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21 views

How to find all cells within a neighborhood with slopes towards the center?

I would like to iteratively go through each cell in a raster in arcGIS that meets criteria (already established as per below description) and find the percentage of cells in a several km neighborhood ...
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20 views

Finding the orientation of location

I'm wondering if there's some way to find the orientation of a set of points along a line as a number (degrees from north) in ArcGIS?
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75 views

Flipping digitized directions of geometry based on route measures using ArcMap

I have a feature class that has a schema like: routeId, fromMeasure, toMeasure, attr1,attr2..etc within a given routeId, the segments flip directionaility many times and are not consistent. I would ...
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0answers
358 views

Generating wind direction raster from wind's components?

I have a point shapefile, with each point representing the location of a weather station and storing values for wind SPEED and DIRECTION (in degrees). My goal is to create a continous surface (...
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44 views

Changing tracks to vectors in a grid

This is a version of a question that I posted on the GRASS list, but I didn't get any suggestions there. I would like to overlay a grid (cell size about 500 m x 500m) over an animal track created from ...
-2
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1answer
44 views

Creating a loop itinerary

I am trying to find a way to create a loop itinerary. For example, I know my starting position, and I want to walk some distance and come back to my starting point. It's quite easy to find itinerary ...