Questions tagged [distance]

The measure of separation between two entities or locations that may or may not be connected, such as two points.

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1answer
700 views

Finding density centroids within polygons in PostGIS

I want to find the highest density of OpenStreetMap nodes within a dataset of census geometries. I want to tie the census data to the location of the node which is most central in terms of population. ...
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5answers
30k views

For every point, distance to nearest polygon of type X?

In ArcGIS Desktop, can you calculate as an attribute value the distance to the nearest polygon of type X? Assume we have a point layer of wildlife observations and we want to know how far each of ...
6
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4answers
1k views

Length of line on specific point (from point layer)

I have a line and a point layer. The points are manually set next to the line at specific places. Now I would like to get the distance between the end/start of the line and the points. Distance from ...
6
votes
2answers
3k views

Way to find minimum value from a group of values - QGIS?

I'm wondering if there is a way to find the minimum value of a group within QGIS? Basically I need to find the minimum distance of each unique value in a table of about 5000 records. I can do the ...
6
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3answers
1k views

Creating duplicate line set distance away from a polyline in QGIS?

I'm new to QGIS and not really sure what I'm doing; I have a polyline of the UK coastline and I want to add another line 30 km offshore. Is this possible?
6
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1answer
8k views

Distance in meters between two geographic coordinates

I want to determine the distance in meters between two geographic coordinates. The points are: Lat (deg) Lon (deg) A: -33.3930906 -70.5452765 B: -33.3993212 -70.5468767 So if i calc the ...
6
votes
2answers
2k views

Finding points along a path

I am unsure of the best approach to this problem. I can think of some ways of doing it which I will list below but I am looking for the best and most efficient way of doing this. Problem Given a ...
6
votes
4answers
1k views

Finding distance between buildings and nearest road using QGIS?

I am very new to working with GIS data. I am currently using the QGIS tool to work with the data. I have two datasets: Buildings - polygon shapefile with information about different buildings in a ...
6
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2answers
268 views

Calculating daily travel distance from large dataset using QGIS?

My dataset is around 200 days worth of data on the daily distance travelled by a troop of monkeys. I've never properly used QGIS on my own so don't really know where to start. All of the days are ...
6
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2answers
1k views

Is there a way to calculate closest distances to a point without using Near Analysis?

I frequently get asked to calculate distances from a specific point (A drilling well in the middle of the sea for example) to a number of Environmental layers (Protected Areas, Pipelines, Other wells ...
6
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1answer
233 views

Deleting “lonely” points in QGIS?

I have a large point dataset of about 5.3 million points. I would like to delete the "lonely" points using QGIS, for example all points with no neighbor within a 5 km radius. The extent of my point ...
6
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2answers
756 views

Get the 2 points immediately before and after a given point in PostGIS

In the picture below: The given point is C, I would like to select A and B, but not Z (which is closer to C than B but it's not immediately after in the LineString). Note that C is always ON the line ...
6
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3answers
2k views

Calculate distance between point and linestring and how to represent that on QGIS?

I have loaded my data with osm2pgrouting and I have my network with ways (Linestring) and nodes (Point). The problem is : I have a database of doctors addresses (point) and I should calculate the ...
6
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2answers
8k views

java vividsolutions jts wgs-84 distance to meters

my (java) project uses com.vividsolutions.jts.geom, which provides a distance function. After some googling I finally found that the return value from this function is in central angle degrees, when ...
6
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2answers
731 views

QGIS quickest method of calculating distance between multiple points in one layer?

Using Qgis 2.18.3, I am looking for the quickest method of calculating the aggregated distance between multiple points. As the Crow flies would be enough... I have a point layer in a small area. ...
6
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1answer
2k views

Seeking Fréchet distance implementation (Python) to cluster trajectories by similarity

I am working on a trajectory analysis project using Python and its data science related libraries. I am planning to implement Fréchet distance algorithm for trajectory analysis, each trajectory has ...
6
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1answer
3k views

How to calculate distance on large raster in R?

I'm trying to do some raster algebra and one of my layers is a distance from a coastline layer. I'm using rasters with 12.5m resolution and when I use the distance function, I seem to run into memory ...
6
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2answers
928 views

Calculating average raster to point distances within census tracts

I have some experience using ArcGIS, but mostly with the field calculator in the attribute table/spatial joins, so I apologize if I say something that doesn't make sense. To provide a bit of ...
6
votes
1answer
5k views

OpenLayers measure tool - instant measurement

I need to use measure tool to measure distances (instant measurement!) in my application. Instant measurement example can be found here. But the main problem is that when I use instant measurement ...
6
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2answers
633 views

Calculate stop times/distances of transport lines - tools and procedure?

I need to calculate stop times of bus lines (extrapolation) I have: Shapefile with all stops Shapefile with control points where bus time was taken Shapefile with all bus routes CSV file with times ...
6
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1answer
5k views

Distances in {Plate Carrée projection - EPSG:4326 - WGS84}

"4326 is just the EPSG identifier of WGS84" [3] Indeed http://spatialreference.org/ref/epsg/4326/html/ says it is a GEOGraphic Coordinate System: GEOGCS["WGS 84", DATUM["WGS_1984", ...
6
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1answer
4k views

WGS point to WGS line segment (great circle) distance

How would I go about resolving this in C#? I have a line segment (great circle distance) defined by two Lon-Lat pairs (call them points A and B). A third point somewhere on the Earth sphere. The ...
6
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1answer
2k views

How to generate a point distance matrix using shortest network distance? [closed]

My problem is as follows. To start with, I have the following spatial datasets: A road network; 13,000 odd point locations representing populated localities (ie places where people live); Service (...
6
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1answer
1k views

Measuring Right of Way in ArcGIS Desktop?

I'm helping bring CAD people into ArcGIS so that everyone throughout the company is on the same page and there is one database for everything. Right now, one of the biggest hurdles is making sure all ...
6
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3answers
714 views

Vincenty or (Project + Euclidean) for accurate distances

I posted a similar question on stackoverflow, however was directed here for more help. If my main goal was to calculate distances such that my error was minimised to the nearest metre assuming that ...
6
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3answers
8k views

Need to get distance matrix for large set of points on-the-fly [closed]

I do not know much about GIS and I do not know much of the jargon. Hopefully you can help me a bit here because I am really unaware of the services and software available. My problem is as follows: ...
6
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1answer
5k views

Finding distance in meters between point and path in lat/lon using GeoTools?

I need to find distance in meters between some point with given latitude and longitude and line (on Earth) defined by several points with lat/lon coordinates. I read these questions: Using ...
6
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1answer
3k views

Using Linestring distance in meters with GeoTools?

I want to use GeoTools for working with gis data. I'm most concerned about distance calculations, not so much about drawing a map. What I still couldn't figure out is how to make distance calculations ...
6
votes
1answer
94 views

Haversine based distance transform

I have a binary image with pixel resolution in units of degrees (EPSG:4326): In this case, all the light-blue pixels are water (value = 1) and purple pixels are not water (value = 0). I would like to ...
6
votes
1answer
269 views

Cleaning GPS tracks from large jump / outliers

Can someone please explain the steps to take in order to eliminate the parts of these linestrings which jump across large distances (not along with the road network)? They were created from GPS ...
6
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2answers
446 views

Geometry distance PostGIS query with <-> operator suddenly much slower

One of my websites suddenly got much slower, and I've managed to track down the issue to a query that uses the <-> operator together with ORDER BY (2D distance between two geometries) to ...
6
votes
1answer
2k views

How can I make a PostGIS ST_Distance_sphere query more efficient?

Within PostgreSQL/PostGIS I have written a SQL query to get the closest distance for each element within a point coordinate table from a polyline table. The query comes back and works correctly, but ...
6
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0answers
192 views

Position of vehicles relative to lead vehicle

I have a set of vehicles (think railway) that are in a (semi)fixed formation. I know the lead vehicle and I know the GPS coordinates of the lead vehicle at any given time. Sometimes, I can rely on the ...
5
votes
5answers
2k views

Getting a square mile bounding box anchored by coordinates?

Let's say I have a lat/lng coordinate pair. I want to determine the coordinates that would create a square mile box. The existing coordintae pair would be the top left of the box, and the coordinate ...
5
votes
2answers
40k views

Looking for a Tool to Calculate Distance Between Points (Between Layers)

I am a college student using ArcEditor 10.0 for a semester project measuring distance to hospitals from census tract centroids. This is my first time using ArcGIS, and I have no formal training. So ...
5
votes
2answers
670 views

PostGIS ST_Distance vs. pgRouting

I am looking to create a city directory web app, and the site will need to be able to calculate distances between two geospatial points (like the distance between the user and a restaurant, or the ...
5
votes
3answers
22k views

Measuring distance between points using QGIS?

I have a layer with about 500 single points. Now I want to measure the distance between each of these points and one specified observation point. I need the distance to show how far away from the ...
5
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3answers
1k views

Projection for Germany that preserves distance?

I have a point A (EPSG 4326) in Berlin, Germany: { "type": "Point", "coordinates": [ 13.394994735717773, 52.514849775310154 ] } I want to create point B that is 500m to the east ...
5
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2answers
7k views

Formula for calculating short distances in UTM?

I'm fairly new at calculating distances with precision, but I wanted to know what is the best formula for calculating short distances in UTM coordinates. The distances that I'am calculating are all ...
5
votes
1answer
147 views

Calculating field AVG from B layer 3 nearest points to each A layer point

I wonder how to calculate statistics (in my case average) of one point layer field (let say B layer) and assign them to each point of A layer. Statistics should be calculated from 3 nearest B layer ...
5
votes
2answers
458 views

Finding distance between point and polygon edge in eastward direction using PyQGIS?

I need to find distance in eastward direction from each point to the closest polygon edge: I can find shortest distance in any direction with: pointlayer = QgsProject.instance().mapLayersByName('...
5
votes
1answer
203 views

Why is the length of one degree in Turf 0.9988?

Calculating the (spherical) distance along one degree of longitude at the equator in Turf returns a number less than 1 (Try it): require('@turf/turf').distance([0,0], [1, 0], { units: 'degrees' }) 0....
5
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1answer
724 views

Verify if a lat-long fall in my route

I am using ggmap package to generate routes. The resulting data frame will contain the routes information from the given source to the destination. library(ggmap) route_df <- route(from = "...
5
votes
1answer
2k views

Transform polygon to equivalent circle, QGis

I have a polygon and I'd like to find the radius of an equivalent circle from a particular point within the polygon. The polygon would have a large (infinite) number of points evenly distributed ...
5
votes
1answer
118 views

Get points within maximum distance from any point in GeoPandas

Given a set of points (with meters coordinates), I am trying to create lines between them. But I don't want to create lines of each pair of points, Iwant to create thoses lines if the distance between ...
5
votes
1answer
313 views

Creating Variable Distance Buffers using QGIS

I would like to create variable distance buffers for some points in QGIS 3.4. I have seen in previous posts that there used to be a tool for this in older versions of QGIS, but that this tool wasn't ...
5
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2answers
8k views

Calculate distance between a coordinate and a county in GeoPandas

I have a single coordinate and a GeoPandas Dataframe representing US counties whose geometry is polygons that form the boundary of counties. Each of these polygons is also given through lat/lon pairs. ...
5
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4answers
2k views

Measuring distance between two points considering elevation raster?

Is it possible to compute the distance between 2 coordinates (x1,y1,z1) - (x2,y2,z2) considering an elevation raster (cells containing elevation)? On the image, there are 2 coordinates (red crosses). ...
5
votes
1answer
717 views

Identifying south facing mountain land, above an elevation, within a slope range, less than fixed distance from major roadways

This odd question comes from believing that such an analysis is plausible in a GIS system. Only, I don't how to accomplish the various discrete steps implied from the Title, nor where to get a topo ...
5
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2answers
3k views

Performing Point Distance analysis using Basic level license of ArcGIS Desktop?

I am using ArcView (ArcGIS Desktop Basic) 10.1 and I need to perform a point distance analysis. What are the steps to determine the distance from A to B-Z, B to A-Z, C to A-Z, etc?

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