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

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2answers
161 views

NNJoin, MMQGIS and Nearest Neighbor QGIS failed to measure shortest distance

I have two layers, one point and one line. I need the distance to the closest line from the point layer. Not NNJoin, MMQGIS nor the distance hub in QGIS provided accurate measures. Any ideas?
16
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6answers
6k views

What tools in Python are available for doing great circle distance + line creation?

I need to use Python to create a great circle distance -- both a number, and preferably some kind of 'curve' that I can use to draw in a client-side map. I don't care about the format of the curve -- ...
0
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3answers
96 views

How to set a coordinate transformation GRID

Does anyone know how to set a coordinate transformation in qgis so I can measure the distances in meters or kilometers? If anyone has a clue, would be just great. Thanks!
2
votes
1answer
38 views

Adding separate distance files to calculate total distance in ArcGIS

I have two raster files: A raster of distance-to-outlet for a creek. Value = 0 at creek outlet (white), and the maximum value is at the beginning of the creek (black). A raster of Euclidean ...
3
votes
1answer
111 views

After how much distance does the x,y coordinate system become noticeably distorted?

I'm working with maritime sensors that give information of moving objects it detects, in azimuth, range and elevation, and we convert it to x,y coordinates for our application to be able to process ...
1
vote
1answer
273 views

Convert distance from meters to EPSG 3857

I need to convert distance from meters to units of EPSG 3857 in PostGIS. This is important for me to calculate a radius for ST_DWITHIN as I'm dealing with geometries. How can I do this?
3
votes
3answers
838 views

Draw line between points from multiple datasets

I have 2 point datasets and want a tool or script to draw a line between all points in one dataset to all the points in the 2nd dataset. Is it possible? I have tried ESRI "Point Distance" and ...
1
vote
1answer
6k views

Getting shortest distances between features on separate polygon layers using ArcGIS Desktop?

I have a county-level map for the state of North Carolina, U.S. I would like to compute the shortest distance of each county to any point along the border of Georgia. How would this be done? ...
0
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1answer
81 views

Calculate distance between two coordinates along lines

I have a map with two layers: a map of the streets of Montevideo, and a map of shops with the lat long location. I would like to calculate the distance between each shop and the nearest one, along the ...
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2answers
143 views

Maximum distance to polygon edge

I have a point feature class and a polygon feature class, and each point is located within one polygon. Is there a way to programmatically calculate the distance from each point to the farthest ...
1
vote
1answer
107 views

CartoDB (PostGIS) near function (distance) points to polygons

I have a CartoDB map here: Link: https://dms2203.cartodb.com/viz/78db6c02-3148-11e5-a42f-0e018d66dc29/public_map I'm trying to find the distance of the points to the polygon. If the points are ...
0
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1answer
196 views

Projection For Measuring Distances

Is it the case that when I use Arc GIS to compute nearest distance from a point to a poly-line/polygon, I need to project them both in an equidistant projection? Note: I am using the near tool. What ...
1
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0answers
263 views

How to obtain an euclidean distance raster from a vector file in QGIS?

I'm trying to obtain a raster of Euclidean Distances from a vector layer I have of a river in Spain. I did it very easily with ArcMap using Euclidean Distance, but I don't know how to do it in QGIS. ...
0
votes
1answer
95 views

Calculating Distance and Time on a network without the use of ArcGIS Network Analyst

I'm trying to calculate a distance and time for walking commuters (about 30,000 records) on a street network (NYC Lion). I have a starting and ending address for each record that have been geocoded. ...
1
vote
0answers
167 views

How to set the length of a line using openlayers [duplicate]

I'm trying edit a polygon by changing the length of some lines by code. Found this method to calculate based on the bearing. But I didn't find anything on how to calculate the bearing, before I start ...
4
votes
1answer
79 views

How to find the distance from a point to a polygon, via another point, in R

I am trying to calculate the distances between a central point, and the edge of a polygon, along straight lines drawn between the central point and another set of points (where necessary extended ...
3
votes
3answers
1k views

QGIS spatial join, calculating distance from polygon to point layer

I am trying to perform a kind of 'spatial join' in Arcgis, joining to a polygon layer atributes of the closest feature of a point layer, as well as distance. But 'spatial query' doesn't offer an ...
3
votes
1answer
471 views

QGIS distance from points to nearest line

How can I get the distances from each point at a shapefile to the nearest line from another? I've tried to follow the directions from Measuring the distance between lines and points in QGIS and ...
37
votes
2answers
4k views

How accurate is approximating the Earth as a sphere?

What level of error do I encounter when approximating the earth as a sphere? Specifically, when dealing with the location of points and, for example, the great circle distances between them. Are ...
2
votes
0answers
61 views

QGIS: distance matrix different outputs

In one of my plugins I would like to use the distance geoprocessing algorithm. When running this algorithm from the menu Vector->Analysis Tools->Distance Matrix I get a different output than running ...
3
votes
1answer
127 views

Problem with distance in QGIS

I start a new project with base on OpenLayers plugin but if I check the distance on QGIS with distance tool (I choose a straight road) I view 5.466m on QGIS and 4.300m on google (by walking). How is ...
1
vote
1answer
49 views

Distance regression in ArcGIS

I have layer of point data of aid projects in Tanzania between 2000 and 2012, and a layer of point data for 42 villages where a survey was conducted in 2003, 2006,2009, and 2013. Within the survey ...
5
votes
3answers
3k views

Dissolving polygons by attribute within certain distance using ArcGIS Desktop?

In a FeatureClass I have a lot of polygons which contain attributes of different landuse-types. Now I am trying to dissolve those polygons of the same landuse-type, but only if the distance between ...
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1answer
33 views

Search radius for some intermediate distance

ArcMap on my laptop runs very slowly. So it can take a long time for a near table to run. Is it possible to use a search radius for some intermediate distance? For example, the search radius only ...
1
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0answers
29 views

Calculating the distance between a set of UTM coordinates [duplicate]

I would like to calculate the distance between several GPS points, these data are projected into UTM Zone 30. I am using Postgresql 9.3 but I am happy to see results with any software or website such ...
1
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1answer
118 views

How to measure the distance between multiple points and multiple polygons?

I'm trying to find a quick and accuarate way to measure the distance between 3 survey sites and all the designated sites within 10km. The survey sites are on a point vector layer and the designated ...
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0answers
112 views

CartoDB: Calculating distance between points in two tables and including the name of the second point in infowindow

I am plotting community gardens in CartoDB and want to show the nearest subway entrance in the infowindow. I have two tables with the location of the gardens and the subway stations. I am able to get ...
0
votes
1answer
140 views

Hex grid on 4326 globe (for use in leaflet)

Im looking for a way to evenly distribute a hexagon grid (x,y,z) on the 4326 globe. Knowing this is not mathematically possible im accepting the following limitations: Poles doesnt need coverage - ...
2
votes
0answers
149 views

coordinate system for calculating distance at the nation scale

I want to use ArcGIS 10.1 to calculate the straight (euclidean) distances from zip codes to their nearest city centers in about 300 U.S. metropolitan areas. I have two point shpfiles: one includes the ...
0
votes
0answers
17 views

Obtain minor distance given am array of points

I have built a query to obtain the minor distance given a point. SELECT name, city, region, Distance(GeometryFromText('POINT(-56.237076563852 ...
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0answers
52 views

Distance sampling bearing new coordinates

I am working on population density of white tailed deer in Peru, using distance sampling. I am stuck trying to find a way to calculate the deer coordinates. I have the observer coordinates who travel ...
0
votes
1answer
143 views

nearest point distance in Arc Map

How do you calculate the nearest distance from one XY coordinate to another XY. I'm using Arc Map 10 I went into Arc tool box -> proximity -> then I only have 2 buffering options. But under buffer ...
0
votes
1answer
2k views

Convert length in decimal degrees to feet

I've got attributes for a length that the Near tool calculated, and it gave them to me in decimal degrees. I need them in feet. Is it possible to do this with the Calculate Field tool? I tried ...
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0answers
11 views

Set of intersection points in trilateration / multilateration [duplicate]

Like in this post I will get a set of points (3 or more) with latitude, longitude and distance (in KM) information to find out the target location. A distance could be about 500 KM. The circles ...
2
votes
1answer
50 views

How to create a raster of equidistant points with distance in meters using QGIS?

I need a set of equidistant points (like a raster) each in a 1km distance to the next over a certain area, in my case Germany. I know the feature "regular points" in QGIS where I can do just that but ...
0
votes
1answer
154 views

How do I measure the distance between two points within a country arcmap

I have two shapefiles with points distributed over the whole world. I would like to measure the distance (like the crow flies in km) from each point in shapefile 1 to the closest point from shapefile ...
0
votes
0answers
151 views

Calculating offset distances perpendicular to parallel lines in shapeile with results written to table using ArcGIS for Desktop?

I have a line shapefile with sets of parallel lines (or sticks on the map) representing the map view of horizontal gas wells that were drilled. I'm looking for tool or Python script to measure the ...
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vote
0answers
377 views

Why Haversine formula and Web Mercator give different length between two latlng points?

I am calculating the distance between two points given by latlng. However, Google Maps (i.e., web mercator projection) gives me a longer distance than Haversine formula. Which is the most accurate ...
6
votes
2answers
4k views

What's the difference between vincenty and great circle distance calculations?

Python's geopy package features two distance measurements techniques: Great Circle and Vincenty's formulae. >>> from geopy.distance import great_circle >>> from geopy.distance ...
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votes
0answers
481 views

How to calculate distance between point feature to multiple polyline features in ArcGIS

I have a GPS track which is basically a point layer. I have different route networks such as - train, tram and bus routes. I want to calculate the distance between each point to nearest features ...
1
vote
1answer
321 views

How to calculate the distance to the nearest coastline from site locations?

I want to calculate the distance to the nearest coastline from my site locations (point shapefile), and possibly the max distance as well. I am using ArcGIS 10.2 and I already have a shapefile of the ...
0
votes
0answers
144 views

Distance Measure appears to be wrong in ArcGIS Desktop?

The distances in my shapefile are completely wrong. I got this shapefile online. Does anyone knows what's going on? I attached two pictures. The shapefile is projected as ...
1
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1answer
1k views

How to calculate driving distance/time between two points

I am doing some analysis for our fire rescue department where we are comparing actual response times to fires vs predicted response times. The actual response time analysis is straight forward as I ...
0
votes
0answers
105 views

Calculating driving distances from a number of post codes to a number of services using QGIS

I am hoping to calculate the driving distance from a large number of post codes to their nearest service. I have used the RoadGraph plugin but this only calculates the distance and time from one ...
1
vote
1answer
44 views

Distance between point layers [closed]

I have a point layer with geographic boundaries of an area and another point layer with road network. I want to calculate the distance of each point of road network layer to the points of the ...
1
vote
1answer
219 views

Calculating distance between borders when one polygon inside another polygon?

I am brand new to ArcGIS and having some trouble. I would like to calculate the distances between the border of one polygon to another polygon. However, these polygons overlap. Thus when I use the ...
1
vote
0answers
39 views

distance() function in field calculator gives unexpected results

I have two layers both containing points - each point in the first layer has a corresponding point in the second layer (same primary key). One layer has CRS EPSG:27700 and the other layer has ...
3
votes
1answer
583 views

How to calculate the distance to multiple locations from each cell of my raster?

I'm working with Arcgis 10.1 and Python 2.7.2 How can I calculate the distance to multiple locations from each cell of my raster? I tried euclidean distance but it only provides the distance to ...
1
vote
1answer
93 views

Buffering line in ArcMap is creating smaller buffer than expected?

When I buffer a point (red dot on image) by 3 miles, it is 3 miles on all sides. When I buffer a line (blue line on image) by 3 miles, it is more like 2.67 miles on the sides parallel to the line. I ...
0
votes
1answer
492 views

Find nearby cities by a driving distance radius

I'm studying GIS services to solve one specific need: Given x/y coordinates of one city, I want a JSON result that lists only cities (not facilities) that are nearby the specified city, within a ...