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
459 views

Creating Longitude and Latitude Lines in Google Maps

I'm working on an independent high school project where i'm trying to build a simple differential equation model for diffusion. I'm trying to overlay the model on top of a map to visualize spread, so ...
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2answers
85 views

Joining two polygon layers based on distance?

I'm new to GIS so this question may be an obvious one. I have one polygon layer of urban land use and another polygon layer of swamps. How do I join the two layers so that I get a column in the ...
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0answers
25 views

avg distance within 2 geometry tables

I have 2 geometry tables: "f" with only one data and "s" with 100 data I want to find the avg distance of s to f these are the commands: CREATE TABLE f id int4 primary key not null , name ...
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1answer
51 views

How can I calculate the nearest distance to a landscape element taking the direction into account (i.e. slope direction, prevailing winds)?

I am trying to build a layer of distance to relevant landscape elements in a watershed. To be relevant, a landscape element must be downstream with respect to the runoff direction.  Clearly, I want ...
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0answers
2k views

Is there a way to calculate driving time/driving duration with google maps api without considering the traffic situation?

I am currently using this VBA-Code, written by Jamie Bull, to calculate both, driving distance, as well as driving duration, between approx. 1.500 villages and a specific shopping center, using excel. ...
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137 views

QGIS distance measure

using QGIS 2.2 and trying to figure out a way to obtain a distance measure for the width of pavement. I have 2 shapefiles: one of points which are at 5m intervals along the pavement centreline and ...
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0answers
158 views

Calculating closest distances in meters/kilometers given lat/long coordinates?

I am using ArcGIS 10.2 for Desktop. I have a shape file containing points worldwide with lat and long, and another world map polygon file whose Geographic Coordinate System is GCS_WGS_1984 and Datum ...
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1answer
27 views

nr of cells between cells

I want to do the following: I have a set of cells with the value 1, and a set of values with 2. I want to calculate for each cell [2] the distance - ideally number of cells - to the nearest cell 1. ...
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1answer
141 views

How to do point-to-point near analysis conditional on common attributes of the two layers in Arcgis 10.2 (advanced)

I am measuring the closest straight distance from cities of interest (in a layer) to their capital cities (in another layer). Basically, distance between a city and a capital city is calculated if ...
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3answers
488 views

How to determine Distance between points using ArcGIS for Desktop?

I am trying to figure out the distance between points based on 1000+ points using ArcMap 10.2. I have transit stops and am trying to figure out how far from stop 1 to stop 2, stop 2 to stop 3, stop ...
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0answers
43 views

How to determine distances of points from closest line? (Mapinfo or QGIS) [duplicate]

I have a set of points and a set of lines. I'd like to know distances of the points from the closest line... answering the question "how many points are within 500m to 1000m of one of the lines, how ...
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2answers
511 views

Find closest feature

How can I find the closest feature(coordinates) in a json file from a set lat lon using openlayers. Currently, I get the centroid point(lat,lon) from the selected polygon feature ok, but I Would also ...
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3answers
22k views

Find points within a distance using MySQL

I have a mySQL table with user name, latitude and longitude of the user. I would like to get a list of user who are inside the circle or square of a given latitude and longitude with given distance. ...
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3answers
557 views

Why is sum of st_length() of segments 20% too big?

I'm running a query to return the total length of some bike paths, from OpenStreetMap. Compared to the known actual length of these paths, they're all a bit too big - something like 10-30%. I know it ...
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1answer
276 views

How to convert distance into latitude + longitude [duplicate]

I have start point (latitude) I know direction, lets say strictly north, and I want to calculate latitude which is 100 meters above the start point. The same for longitude. I believe there should be ...
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1answer
173 views

ArcGIS spatial join - WITHIN A DISTANCE including distance

I am applying a spatial join in ArcGIS between points (target features) and lines (join features). I want to have a 1-to-many join, so I use the match option 'within a distance'. So far so good. The ...
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1answer
344 views

Calculating “travelled distance” of a GPS track without including “stops”

I have a set of GPS tracks from a cycling event and I want to correlate their distance along the route. Problem is: when a rider stops, generally by entering a covered place, GPS keeps logging (low ...
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1answer
1k views

Radius of Curvature Python/Arc, how access x,y coordinates

I have a polyline in ArcMap 10 and I am able to script the length of the line in Python using this bit of code: #Calculate Radius of Curvature #try: # Import system modules import sys, string, os, ...
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0answers
43 views

Distance raster from one raster value (A) to another value (B) while ignoring similar values [closed]

I have two different patch types: A and B I want to get a distance raster from all A types to the closest Type B patch but I don't want the raster to calculate from A to A or B to B. Just A to B. ...
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2answers
7k views

How to use Distance Matrix tool in QGIS?

I have a point data set. Now there are cluster of points based on a field. So I take out one such cluster which has points with same field.I want to find distance between all the points in cluster and ...
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3answers
662 views

New to ArcGIS and want to compute distance between two points “as the fish swims”

We have a layer named Hydrography which is the water area for a given assignment. I have a station point and a target point. I need to compute the distance between those two points but inside of the ...
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1answer
3k views

Shortest distance from point to line (big dataset)

What is the best method to calculate the distance from the nearest road for a series of address points in QGIS, having a very big dataset? (QGIS 2.0.1, Win XP) I read the answers to previous similar ...
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1answer
71 views

coordinate pairs distances

I am new to GIS and have the following question. My shapefile has several coordinate pairs (x1, y1, x2, y2) and I would like to calculate the distances between the points within one go. Any ...
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1answer
259 views

Calculating distance between coordinates [duplicate]

I would like to calculate the distances between a list of coordinates (classic GPS coord.). From coordinate A to B from B to C from C to D and so on, and so forth. Is there any program, or website, ...
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1answer
45 views

Find Distance within each Raster contiguous cell block

I was asked to find for each Individual Contiguous Forest Block the distances INSIDE of each where it would be the farthest (aka the most isolated) from each forest cell block's respective edges. I ...
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2answers
5k views

Excel Distance Calculation

Is there a way (preferably in Excel) to calculate the distance (based on lat, lon) between two lists of points? My end goal would be, for example, to have a list of Starbucks and a list of McDonald's, ...
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1answer
204 views

Cut polylines at intersections in QGIS (or how many km road for each country)

I want to measure how many km a road stand on each country it intersect (i.e. how many km of the european road "E45" stand on Italy, Austria, Germany, and so on). I have a polyline-shapefile with the ...
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3answers
1k views

Distance between a line layer and several other line features (arcGIS 9.3 Arcview Licence)

I have a "Drain" line layer (with 150 lines) that I need to calculate the distance from lines to all objects within 120m. I've tried doing a spatial join and its great but I need more than just the ...
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0answers
78 views

Is there any GRASS command to measure the distance between a point in rastermap and another in vector map?

I have a question about WinGRASS 6.4.3. Is there any GRASS script command to measure the distance between a point in rastermap and another in vector map? I have a raster map and a vector map. Raster ...
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1answer
104 views

Adding Distance (KM and Miles) to a Map using ArcGIS 10.1

Using ArcGIS 10.1, how do you add and show the distance in mile / km markings alongside the marked trails(KM and miles) while using the aforementioned 10.1?
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2answers
108 views

Distance calculation PostGIS

I've got the following task to solve: I've got two tables; one contains buildings (houses) as points and the other contains train-stations (at_bhf_classified) as points. I need to find out the ...
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1answer
589 views

Calculate distance of points along a route QGIS

I have a line layer and a point layer, I need the distance between the first and the last point measured along the line. How can I do that using QGIS? Do I need to know linear reference? I don't ...
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1answer
225 views

How to calculate distances between several points along network?

I have several points (bicycle share hubs), and I want to calculate the distance between each of them using a network. I want a CSV/XLS that has three headers: hub_id1, hub_id2, distance. I've ...
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4answers
12k views

How do I calculate the bounding box for given a distance and latitude/longitude

Hi need to be able to calculate a bounding box or circle for a Given WGS84 latitude and WGS84 longitude, and distance but have no Idea where to start! The distance from the start lat Lon would be 10KM ...
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1answer
158 views

How to select polygons by distance to a single polygon in another layer?

I have a shapefile A with a group of polygons, lakes. Now I want to select the polygons(lakes) that are within a specific distance to a polygon in a second shapefile, B, with the polygon a city. In ...
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2answers
78 views

Distance from one point to many polygons

I'm using ArcMap 10.1 and have a shape file of polygons of municipalities. I also have the coordinates of the centroids of the polygons (if I need to use them). I want a column in my attributes table ...
3
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2answers
47 views

Average Proximity Metric

I'm looking for a metric that gets at average distance to a given feature. For example, for a point in the water, how far, on average, is the land or to what extent is the point surrounded by land. ...
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1answer
69 views

ArcGIS 10.1 Cost Distance Calculations

I have a study area that is a polygon feature class, and am running the Cost Distance Tool on it in ModelBuilder. However, everytime I run the tool, it only calculates a cost distance and cost ...
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0answers
457 views

How to approximate point to segment distance on sphere?

I would like to approximate the distance of a line segment from a reference point on the map (coordinates are gives as lat/lon). In the Cartesian coordinate system I would simply find the closest ...
2
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1answer
215 views

GeoDjango: read geometry column in geography field

I have a Django application that needs to work with an existent PostGIS database, apart from its own database. I've configured multidatabase support, created a database router, created models for the ...
5
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1answer
1k views

calculate {minimal} distance between polygons in R

I have calculated the surface area of species distributions (merging polygons from shapefiles), but since this area can be comprised of quite distanced polygons, I would like to calculate some measure ...
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1answer
34 views

Determine when a route enters and leaves a polygon

I have all of the segments of a route from White Horse, YK to Miami, FL. Now I want to determine how many miles I travel in each State / Province. I have Polygons for each State and have been able ...
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2answers
2k views

What formula is used for distance between 2 points in Google Maps?

What formula is used by Google Maps for calculating the shortest distance between 2 points (having their Lat, Lng coordinates)? Is it purely based on Haversine? Or is it something different? Is there ...
3
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1answer
689 views

How to create points at shortest euclidean distance to other points?

So, I have a lot of points, and I need to site three new points so they will be at the shortest euclidean distance between all of the other points. In other words, these three new points that I need ...
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3answers
204 views

Computing distance of a georeferenced .jpg to each polygon (town) in a shapefile

I have a .jpg that is a highway that spans multiple towns, and a shapefile with boundaries of these towns. I have georeferenced the .jpg so that it is aligned with the shapefile of the towns. My ...
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1answer
1k views

ArcGIS giving measured distances and the scalebar incorrectly

I am currently using ArcGIS 10.1 and am struggling to be able to measure distance or set a scale bar correctly. Its currently giving me absurd results orders of magnitudes to small (0.5m etc). All my ...
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1answer
707 views

Creating Random Points in ArcGIS 10.1

I would like to create random points across my study area (which is a DEM raster) using the Feature Class> Create Random Points. However, I need to select/copy/move/delete these points and re-arrange ...
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0answers
140 views

Calculating distances between boundaries of polygons with Python

I have two sets of shape-files which have to be worked on within a Python Script. Those two Shape Files might differ from each other (same thematic content, but 2 different epochs). If there occurred ...
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2answers
2k views

Calculate distance in kilometers between two points

I have a few questions regarding the calculation of the distance between 2 postal codes. Take a look at the following code. ### # load the different packages we need ### require("rgdal") ...
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2answers
2k 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 ...