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

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16 views

Distance corresponding to fractions of a minute of lat/long [duplicate]

My GPS is set to degrees minutes fractions of a minute. I am trying to determine the distance represented by a single increment on the Lat and Long of fractions of a minute. IE. traveling from ...
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1answer
30 views

Distance of points to nearest polygon edge in ArcGIS 10.2

I have a point feature class that consists of a systematic grid of points across a landscape. I also have a shapefile consisting of several polygons. For each point in the feature class, I'd like to ...
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28 views

Wrong buffer distances from ArcGIS for Desktop? [on hold]

I am making a buffer from a point feature class, 70 meters buffer. ArcGIS gives me back a 50 meters buffer. A 90m buffer becames a 65m and so on.
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1answer
10 views

polygon vertex to vertex distance calculation in arcobjects

I have polygon with multipart (donuts) I want to calculate vertex to vertex distance. I tried to get outer ring vertex to vertex distance and it is working. Could you please tell me how to get inner ...
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2answers
44 views

Create buffer along shoreline near sample site

I want to look at the land use on the shoreline of a river relative to a specifc point on the river. I have created a point on the shoreline using the Near tool. Following this I am having trouble. I ...
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26 views

How to create an attribute table from a Euclidean Distance Raster?

I am trying to create an attribute table from an Euclidean Distance Raster. I get the following error: "error 000423: Only single band integer dataset is a valid input". The ED Raster has actually the ...
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2answers
75 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 ...
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1answer
28 views

Distance to object, taking into account size of object

I have a number of polygon features on the edge of a lake feature. I also have sample points throughout the lake feature. I am looking to add some sort of indicator for these points as to how ...
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1answer
27 views

SQLite db with FDO geometries: how to assign ID of point in layer A to closest point in Layer B with SpatiaLite?

How can I assign ID of point in layer A to closest point in Layer B with SpatiaLite (find nearest neighbors for each point in A)? For each point stored in table fdo_fc1 I would like to select one, ...
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1answer
39 views

How do I generate a distance table using 2 different point files and a line file?

I have two point datasets, one containing multiple transit stops and the other containing multiple schools. I also have a street line dataset. I need to generate a table that gives me the shortest ...
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1answer
42 views

Postgis ST_Distance query returning inaccurate results

I am using the following query to retrieve records from a postgresql DB @services = Service.select("*, ST_Distance(services.lon_lat, ST_GeomFromText('POINT (lat lon)', 4326)) as ...
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40 views

How to calculate the average point spacing for a layer of points in QGIS?

I have a set of points and want to calculate the average point spacing for further analysis. ArcMap has the 3D Analyst Point File Information for this but I'm searching for an alternative in QGIS. ...
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1answer
55 views

QGIS Azimuth and Distance plugin length issue

Relative newbie to QGIS and trying to figure out exactly what I'm doing wrong. A couple days ago I had azimuth and distance working perfectly. I was using it in a different project with different ...
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68 views

Merging rasters which overlap using ArcGIS for Desktop?

I need to merge two rasters which overlap, both indicate distance values. I need the output of the merge to result in the shorter/lower distance value. I am using ArcGIS 10.1. I hope it is more ...
2
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1answer
67 views

Calculate longitude length in miles

Suppose I have geographic coordinates of "Saratoga, California, USA" as Latitude: 37°15.8298′ N Longitude: 122° 1.3806′ W I know from here that in case of latitude 1° ≈ 69 miles and that ...
2
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1answer
44 views

Calculating Distances Between Geometry Columns of Differing SRIDs

I am attempting a relatively simple task but have been running into trouble. I have two tables, one which has lat and lon points which were geocoded using google (SRID 3857) and another table which ...
3
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1answer
68 views

Proof of part of haversine formula?

I'm trying to study how to find the distance between two points if their latitudes and longitudes are given. I have a question about the proof of part of the haversine formula given at Math Forum. ...
2
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1answer
45 views

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

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: ...
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1answer
19 views

How to calculate the shortest path to pass on 7.000 UTM points?

Anyone can give me an advice how to calculate the shortest path with a lot of UTM points? In total I have 7000 points, but it can be grouping 100 or 500. I have knowledges about Java and Python for ...
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1answer
27 views

Euclidean distance outside a Polygon (ArcMap)

I got some university coursework to analyse the best potential areas for a residential development project and I'm currently doing multi-criteria evaluation. One of the shapefiles in the dataset given ...
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2answers
108 views

Calculate distance between a set of points: lat and long in QGIS or R

I have shapefiles containing the location of several individuals along several months. Positions were documented with a 30 minutes interval. Tables contain the following data fields: collar (ID), ...
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1answer
36 views

Euclidean Distance between two lines

I have two lines in ArcMap 10.2.2 and was wondering if it is possible to create a raster showing the Euclidean Distance between them. Like to map each cell on one line to its nearest cell on the other ...
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50 views

Given distance (in meters) what is the angle in geographic reference systems? [duplicate]

In QGIS and other systems sometimes I have a layer in geographic reference system (typically WGS84, EPSG:4326) and I'd like to calculate a buffer of say 5000m around a point. So, given a point ...
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1answer
22 views

'Find your nearest' type function with a large dataset

In a previous employment, I needed to display a "Distance to stockist" on our website. It would get your current co-ordinates (from a postcode or HTML5 geolocate) and then display a list of nearby ...
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2answers
36 views

Distance to, travel only on one surface

Looking to create a distance to wetland raster. However this travel distance must be through the water only. I have tried setting land to a high cost (e.g. 99) however doing so I have to set each ...
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1answer
32 views

How do I interpret this proj4string and why doesn't changing units change its resuls?

I'm new to GIS - I have a background in statistics. I have the following proj4string: '+proj=lcc +lat_1=40.66666666666666 +lat_2=41.03333333333333 +lat_0=40.16666666666666 +lon_0=-74 +x_0=300000 ...
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40 views

Which projection should be chosen to model transmission lines across the USA?

I am looking at different options for high voltage power lines in the US. These power lines cross several states. Since in the end the distance is of importance, is the USA Contiguous Equidistant ...
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0answers
44 views

QGIS distance from point to line along a specific bearing

I've got a vector layer with points (representing customer locations) and another vector layer with a line (representing the coast line). I want to calculate a "smart" distance to coast. Specifically, ...
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2answers
35 views

Postgis: Query ST_DWithin in square instead of circle

The ST_DWithin query queries all geometries within a certain radius from another geometry (in my case a point). For performance optimization of my application I want to query in a square. So that the ...
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1answer
64 views

Cost Distance interpretation in ArcGIS 10.2

I am using the Cost Distance tool in ArcMap 10.2 to find the how far it is to walk to the closest area of green space along the road network in a town. I have a input raster of the location of the ...
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0answers
63 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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24 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
229 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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1answer
31 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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0answers
16 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
33 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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1answer
37 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
20 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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0answers
64 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 ...
2
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1answer
120 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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1answer
43 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

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
44 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 ...
2
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0answers
121 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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1answer
11 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
96 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
43 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 ...
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186 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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63 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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96 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 = ...