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
617 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 ...
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2answers
523 views

clustering points in postgresql to create contour map

UPDATE: To try to make this a little more simple, is it possible to create a query which selects a group of points such that each point in the group is at most X units away from at least one other ...
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1answer
131 views

Zoom variable or pixel distance

I have query by distance working in a framework that generates a list of features within a fixed distance of a clicked feature. I would like to make the queried distance variable based on either: ...
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1answer
72 views

Geographic Heatmaps with Concentric Circles by Distance

I'm looking to generate a geographic heatmap (using 'ggmap') that overlays some dimension (to start, housing prices) over the lat/lon near a city center. Then I want to create circles of equi-distant ...
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14 views

Convert java.vividsolutions.jts.geom distance to meters

I am using com.vividsolutions.jts.geom to perform the distance calculations. I have a list of "LineString"s and a Point (Say A). I want to determine the The nearest LineString to the Point A. The ...
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0answers
16 views

Calculating position in SRTM grid

I'm actually trying to calculate a grid point position in a SRTM grid by row and column count. So I got a position by lat/lon, then calculating the row and column in my hgt-file (this post helped me) ...
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2answers
98 views

QGIS equivalent for ArcMap join for purpose of distances from points to polygon?

It is relatively easy to calculate distances from points to a polygon in ArcMap by doing a join and selecting the option for creating a field containing the minimum distance information. i.e. it ...
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1answer
29 views

Assign points with varying radii to central meeting locations

I have a set of points in a city, each with a maximum distance radius of 0.5 - 1.5 miles. From this set of points, I'd like to create a small number of 'meeting points', i.e. locations that are ...
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2answers
148 views

PostGIS nearest point with ST_Distance

I need to obtain on each element on one table the closest point of another table. The first table contains traffic signs and the second one the Entrance Halls of the town. The thing is that I can't ...
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2answers
714 views

Calculating the distance between points and multiple lines?

I have a point shapefile of about 100 points and a polyline shapefile of about 200 lines and I am interested in finding the distance between every point and each individual polyline. My polyline ...
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1answer
158 views

How to calculate which zip code is closer to which in USA using C#?

I'm not living in USA, and I'm doing a small project for a company based in USA. The point is that, there are businesses and each of them have their address and zip code. Then, I have a form where ...
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1answer
28 views

ESRI Javascript API pan parameters

Using the ESRI javasript API, is there a way to set the distance the map will move when panning? When I fire the map.panUp(), for example, it pans, but about twice as far as I would like it to.
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11 views

How to relate the zoom level with the real distance in the map?

Let's have this situation: in the frontend I have selected a zoom level in the map. Now, the application must invoke an external API method to search the available items in the current bounding box, ...
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1answer
768 views

Calculating distance in WGS84 (MySQL and Geoserver)

Here is the environment in which I work: An application using geo-referenced data Database MySQL 5.5, storing georeferenced points A Geoserver server, connected to the MySQL database Here is the ...
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0answers
46 views

Calculating distances in Geographic Coordinate System using ArcGIS for Desktop?

I work in a Geographic Coordinate System and using the "Generate Near Table" tool in ArcGIS 10.2 for Desktop. I want to calculate the distances that each feature of the point layer has to the closest ...
4
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1answer
407 views

How can I make a Postgres/PostGIS ST_Distance_sphere query more efficient?

Within Postgres/PostGIS I have written an 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 ...
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1answer
1k views

Calculating distance scale factor by latitude for Mercator

This was really inconvenient topic to google out - so I'm asking for clarification, did I understood things correctly. I'm talking about measuring short distances in Mercator projection (3857). You ...
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6answers
5k views

Which tools and methods can be used to create isochrones?

I'd like to get an idea for what's involved in creating isochrones for a series of sites, with a reasonable degree of accuracy to the estimates. A general outline would be great, though my scenario ...
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1answer
32 views

Distance between coordinates

I placed some cones on a sports playing field and estimated their locations using latitude/longitude coordinates. An example pair of estimated latitude/longitude coordinates is 54.96975, -1.51407. On ...
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0answers
18 views

Creating a distance overlay that is computed by the distance of points/lines and recalculated on zooming

I created a fictional map and visualized it with d3. Now I would like to show a scale/rule so that the user can see which distance (kilometers,meters) he is currently using. I was thinking about ...
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1answer
37 views

Calculating distance between many users of a handful of facilities, a small hangup

I am trying to calculate distance between thousands of people and a handful of facilities. I know the ArcGIS ROUTENAME issue has been addressed many times in forums. I have scoured them and am hung ...
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1answer
41 views

A bit of help using Google maps

I have 1000 or so points on a map, (I have GPS coordinates. I would like to use google maps to find the shortest distance using roads, between pairs of points. I would like to measure all pairs within ...
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3answers
381 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 ...
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1answer
143 views

How to set the length of a line using openlayers

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 ...
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1answer
147 views

Method to compute and visualize the closest set of facilities from OSM data

I want to use OSM to extract a set of facilities e.g. school, park, hospital inside a given region. from that, transform the area in grid and for each cell in a grid compute its score mixing the ...
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1answer
32 views

Calculating distance between previous and current addresses for large file

Hoping to get help with this. I'm a fairly new QGIS user and trying to solve the following problem: Let's say I have a large dataset (5000+ records) of customer addresses, previous and current, and I ...
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2answers
350 views

Measure average distance between two lines with common endpoints

I have two shapefiles, each with a set of lines generated from start and end points. One shapefile has the straight lines generated from the XY To Line tool, while the other has lines generated from a ...
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2answers
172 views

Measuring Continuous Distance of GPS track in ArcGIS Desktop

I am looking for a way to quickly measure the distance covered of GPS tracks of foraging Seabirds. A tool that could give accumulative distance of point to point from the long and lat coordinates ...
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3answers
198 views

Calculating all distances from single points to multiple polygons

I have two layers: a point layer defining properties (95 objects), and a polygon layer defining plots of land associated with the properties (211 objects). Each point relates to one or more polygons. ...
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2answers
38 views

distance between paired points in separate shapefiles (paired by attribute data)

I have a point layer with site_code attribute data. I have another layer of points in different locations but with the same site_code data. How can I find the linear distance between points that are ...
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0answers
52 views

GeoTools - Find distance in meters between point and path in lat/lon

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 this questions: first second ...
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3answers
6k views

Calculating the minimum distance between points and polygons in QGIS

I have two vector layers: one point and one polygon and I want to calculate the minimum distance of each point from the polygons (ie the distance from the closest point of the closest polygon). Is ...
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1answer
9 views

How to set a polyline length as per a given Image

I have an image of a map representing the road networks. I have converted these road networks into a shapefile with only polylines. I want to set a distance to this road network. For e.g I know from ...
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3answers
90 views

Computing distance from points to coastline

I have a shapefile with the nodes of a grid I have applied, for the purposes of interpolation, and I want to compute the euclidean distance that each grid node (it is a point vector) has to the ...
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0answers
41 views

QGis measure tool does not continue to measure within point symbol

We are using QGIS more and more, however, today a colleague noticed something strange when using the measure line tool. We have point features and different symbols of different sizes and colors are ...
38
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5answers
9k views

Why is the 'straight line' path across continent so curved?

This is the result of mapping the straight line path from a point in US to Poland using Distance Measurement Tool. Also, planes from Asia to US would travel almost over North Pole. Why is the path ...
12
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5answers
11k views

How to generate random locations nearby my location?

I am trying to create random locations nearby my location. What i want is to create random latitude/longitude pairs inside a 200 meters circle surrounding my location. This is the formula i came up ...
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0answers
42 views

How to choose data type and SRID, for coordinates from different sources, in a medium size zone

I'm developing an application. In the database I need to store coordinates for many places, in the north-east of Italy, but the area could expand in the future. This coordinates will come from some ...
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0answers
118 views

Finding and selecting locations in database near 10 km distance from path

In the Google Maps API, I have this Javascript. It is finding and showing user the shorter path between two cities. <!--////// \\\\\\\--> <style> #panel { position: ...
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1answer
74 views

Distance between a Point and Linestring: PostGIS/GEOS vs. Boost

I am currently using the GEOS library through OGR and data from a PostGIS database to work with geospatial data. I now found myself in the need to use some of the algorithms Boost.Geometry and ...
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0answers
51 views

Trilateration using 3 x,y points and 3 distances, all in cm [closed]

I want to find out the position (x,y) of a given point, knowing the distance from 3 x,y points. Below you can view the x,y coordinates and their given distances in cm. B1x = 795 B1y = 332 B1d = ...
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1answer
47 views

How to convert distance in meters(EPSG:28406) to EPSG:900913 with OpenLayers?

For point I use OpenLayers and transform(): numZona = Math.ceil(parseFloat(lon)/6)); Proj4js.defs["EPSG:28406"] = '+proj=tmerc +lat_0=0 +lon_0='(parseInt(numZona)*6-3)+' +k=1.000000 ...
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26 views

Get latlong at a distance on a path

I have 2 decimal point in lat/lon. I want to divide the line drawn by lat/lon into parts each at a specified distance, lets say 'x' -- all except the last segment will be of length x -- and I need the ...
4
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3answers
2k views

Comparing two point shapefiles that contain lat/longs and compute distance using ArcGIS Desktop?

I have 2 sets of point shapefiles in ArcGIS Desktop (group A and B), each set has around 1000 entries that contain lat/long. What I want to do is compare Group A against Group B and figure out for ...
11
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6answers
14k views

Calculating Lat/Lng X miles from point

I am wanting to find a latitude and longitude point given a bearing, a distance, and a starting latitude and longitude. This appears to be the opposite of this question (Distance between lat/long ...
2
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1answer
39 views

am I setting up data from google geocoding correctly for ST_DWithin search?

Sorry to ask a basic question, but I have not been able to find this laid out entirely anywhere. I am mostly relying on this SO post: What Spatial Reference System do I store Google Map's Lat/Lng ...
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4answers
3k views

Geodjango- get the distance between 2 points

What I want to do is quite simple, I have 2 locations defined by gps coords, lat / long like returned by google maps: http://gmaps-samples.googlecode.com/svn/trunk/geocoder/singlegeocode.html I need ...
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1answer
59 views

postgis calculate distance between point & polygon/circle

By basic requirement is to find the nearby fences to a particular point(user lat long alt) within a N meters. I have list of polygon/circle in DB with 900913 srid ...
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0answers
28 views

Using the accCost() function in R: questions regarding the transition layer

I am trying to use the accCost() function from the gdistance package in R. I load my cost raster using the raster()function from the raster package. According to the documentation, I need first to ...
2
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0answers
54 views

Calculate Euclidean distance to raster WITHIN multiple polygons

I am using ArcGIS 10.1 on a Windows x64 system. I am working in a study area where I have 360 000 locations of about 50 territorial animals. I have a shapefile containing 125 sometimes overlapping ...