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1answer
26 views

How to reduce points by proximity

I got a layer with over 4 million points. The distance between the points are 1 meter. How can i reduce the data so that no points have less than e.g. 10 meters between them?
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2answers
30 views

Selecting nearest 300 buildings (polygons/centroids) from list of points using ArcGIS for Desktop?

I have been trying to look for an easy/quick way to select a certain amount of polygons (layer 1) from a 90 points shapefile (layer 2). The idea is to identify the nearest 300 buildings from each of ...
2
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1answer
34 views

Is nearest search done on Euclidean plane accurate

I am writing a program which will find all the points within 1km. I am planning to to do this on a Euclidean plane as my database only supports Euclidean plane or sphere indexing ...
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0answers
38 views

Finding proximity to waters, such as lakes, rivers, streams, the oceans

At Alz.care, we are working to detect whether someone who is living with Alzheimer's is nearing a body of water, because of the very high risk of drowning for persons with that neurocogntive disorder. ...
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1answer
34 views

Closest feature at angle using ArcGIS for Desktop?

I have points representing where street light poles meet the ground. I also have the angle which the mast arm is facing. We use this to symbolize the features by showing the mast arm over the ...
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0answers
32 views

Measuring Distance in ArcGIS Desktop?

im a Mastr student an i want your help in a practice . ive sampled soils around a lake to study the pollution in the study area . how i can measure the distance between every point in the samples ...
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3answers
97 views

pairwise (linear) distance between points of the same shapefile

Given a set of points representing villages stored in a .shp file, is there a way to compute the pair-wise distance (Euclidean) between them? What I would like to come up with is a sort of symmetric ...
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1answer
36 views

Associating 2 point files

In the image below, the green points are associated with radar wave amplitude data. They're generated from RasterToPoint, so they're at the centroid of each pixel and have only the value of the ...
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3answers
40 views

Join attributes by location doesn’t appear to be including data that it should

I am trying to calculate the number of bus stops which are within 400m of c. 100 properties that are in relatively close proximity to one another. Using MMQIS I created the 400m buffer for the ...
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0answers
21 views

Aggregate polygons based upon adjacency to an acreage threshold

I work as a forester. I have a feature class of approximately 750 polygons that range in size from a few acres to more than 250 acres. I would like to combine these polygons based upon their proximity ...
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1answer
30 views

Number of lines within specified distance of thousands of polygons

I have ~5000 polygons in green (districts). I have storms that I am interested in as red lines. Each storm has a unique ID. Looking to add fields to the districts. The fields are 25km, 50km, 100km, ...
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0answers
30 views

O(1) mapping between base32 geohash box to it’s neighbors

geohash-js demonstrates the calculated matrix for neighbor geohashes as following These matrices demonstrate the formation of the geohash base 32 pattern in both vertical and horizontal orientations. ...
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1answer
79 views

Alternative to Generate Near Table in ArcMap 10.2

I want to get the distance between each polygon in one layer (each rectangle in a fishnet grid over the area in question) and the nearest polygon in another layer, but "Generate Near Table" never ...
2
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1answer
57 views

How to update a column in a layer with NULL currently to nearby value in QGIS?

Currently I have a layer with construction year attributes in it. Not all of these are filled out and I figure it is reasonable to update them with the construction year of the nearby elements as they ...
0
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1answer
41 views

Fill larger polygon empty space with closest subset of polygons

Looking for an ArcGIS or QGIS solution. I need to divide up the space of the large single green polygon. Each new polygon would represent "nearness" to the purple polygons and have the ID of the ...
-1
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2answers
103 views

Calculating proximity Near tool with XY data in ArcGIS for Desktop?

I am trying to calculate the nearest distance from a set of lat/long coordinates to a database that contains a list of library addresses. I have managed to import the lat/long coordinates and exported ...
1
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3answers
116 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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3answers
131 views

Spacing a set of points

I have a shapefile of a set of points that I want to space out. I DO NOT want to do this using line interpolation as I run the risk of placing a point where there wasn't one before. I can load this ...
2
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3answers
205 views

How to select top 10 records in an attribute table

I am using Modelbuilder in Arcmap 10.2 to try and find a way to select the first 10 records sorted by Category and then by Distance. For example, my table has 100 banks and 100 churches, which is the ...
2
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2answers
182 views

Measuring distance between two points?

I have two shapefiles and I would like to know the distance between each point on File1 and each corresponding point on File2 (one to one relationship). I have been using the Ruler and manually ...
2
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1answer
1k views

Fastest strategy for proximity searches in SQL Server 2012

This is my very first question here, so bear with me! I'm implementing a back end for a mobile app which will have to do proximity searches to find nearby POIs (points os interest). I know it's a ...
1
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1answer
49 views

How to find ID's of nearest stations (points) in a specific radius

I am using ArcGIS 10.0 and I am doing rainfall data analysis. I have a single layer including more than 1,000 stations (points) and I need name (STATION_NO) of neighbor stations in more than one ...
3
votes
1answer
238 views

How to batch process near feature distance in ArcGIS

I have 2000+ point shape files. These are all GPS tracks. I want to calculate the distance from each point to the nearest feature (road, train line, restaurant etc) within a 30 meter radius. I am ...
2
votes
1answer
52 views

Calculate distance for point to point based on value in field of first point

I am trying to figure out the best way to calculate the distance for each student from the school they attend. We have 2 shapefiles - the student locations with a field identifying the school they ...
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0answers
333 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 ...
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2answers
199 views

Feature Distance for each Raster Cell

I have a polyline layer of roads and a raster of land ownership. For each raster cell I would like to calculate the distance to the nearest road. I am on ArcMap 10.2 with Spatial Analyst and 3D ...
1
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1answer
143 views

gdal_proximity distance to meters

I followed the answer given in this topic for searching the distance to the nearest coastline given a lat/lon coordinate. The distance output obtained is in degree (I think) but I need the distance ...
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0answers
69 views

Sort Proximity Results Into Groups Based on Distance from Center

The scenario is as follows: I have a database of pizza places with review averages. I want users to be able to find pizza places near a location and have them sorted by distance. Pretty straight ...
2
votes
1answer
125 views

Averaging XY points locations if in close proximity automatically over a large dataset in R

I have a point dataset (XYZ values) containing a few million points covering a 5km x 5km extent representing maxima locations. However there a great deal of these points which exist in 0.5m of others. ...
3
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1answer
191 views

Select points approx. 2000 metres from another point along a river?

I have a series of points representing a river network (See Image Above). Each point contains attributes on Latitude, Longitude, Z value and Length calculated using flow accumulation. The river ...
1
vote
1answer
96 views

QGis points distance from shore in metres

I have a grid of depth points in the Irish Sea that i'm trying to add other data fields to, in this case distance from shore. I've tried both of these suggestions to no avail, but am having some ...
1
vote
2answers
177 views

Create line between polygon and nearest raster cell

I need to create a line between polygons (centroid) and the nearest cell of a raster dataset. The polygon and raster do not intersect. Each polygon has a UID. One cell can be linked to many polygons, ...
3
votes
2answers
48 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. ...
3
votes
2answers
720 views

How to Speed Up ArcGIS 10.1 for Desktop Generating Near Table on Polygon Feature Classes?

I am trying to create a near table to link two datasets. The first consists of the outlines of about 1.8 million buildings, the second a 3 meter buffer around these buildings, which as been merged ...
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3answers
185 views

Determining distances between multiple points without crossing roads? [closed]

I'm working with civic addresses (points) in the county that I work for (there are nearly 10,0000 points). I am trying to find out how many of the points are within certain distances or less from each ...
0
votes
1answer
529 views

How to transfer attribute of nearest Point to Line feature?

Feature class 1: Addresses (Point) Feature class 2: Road centerlines (Polyline) Which is the most appropriate tool for transferring the Address attribute (e.g. Road No. or Bldg) to the nearest Road ...
1
vote
1answer
87 views

Distance matrixes and ports positions

I have port positions and need to generate distance matrixes in nautical miles. I am using Proximity tool of ArcGIS for obtaining distances but in this case it doesnt work as I have restrictions i.e. ...
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votes
1answer
271 views

Proximity in space and time

I have some point data which represent daily lat-lon locations of an animal, with an associated timestamp. I would like to identify all points where STATIONARY = TRUE. A point qualifies as being ...
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votes
2answers
62 views

How to flag parcels as being within stop type dependent distance of transit stops?

first question here! I have a parcel layer and a transit stop layer. The transit stop layer has different bus stops, light rail stops, etc. I want to add to my parcel layer attribute table fields ...
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0answers
306 views

How to analyse correlations between variables and points? [closed]

I have just lost the past 8 hours on this, and literally getting nowhere - hoping someone can help before I go mad! I am trying to determine the correlation between sinkholes and a number of ...
5
votes
3answers
307 views

In PostGIS, how to count nearby points efficiently?

I have one dataset A with around 6K point geometries and another dataset B with around 600K point geometries. I am trying to come up with an efficient way to update dataset A with an integer ...
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2answers
2k views

Creating Thiessen (Voronoi) polygons using lines (rather than points) as the input features?

I have a set of line features inside a particular polygonal boundary. For each line, I'd like to generate a polygon inside which every possible point is closer to the given line than to any other line ...
3
votes
3answers
1k views

How to measure minimum distance between objects in two layers using arcpy?

I am working on an alien species analysis looking at the spread of a species from the mainland to islands in an archipelago. I am doing the analysis using arcpy and I have succeeded in isolating risk ...
4
votes
3answers
257 views

Slow performing ArcGIS Near tool returns -1?

We are running an ArcGIS 10.0 geoprocessing script written in Python that (as part of many steps above & below) runs the Near tool. Both the input and output datasets (shapefiles & personal ...
1
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1answer
396 views

Finding three closest points in layer to each polygon in another layer using ArcGIS Desktop?

I am working with two layers in ArcMap 10. One is a point layer and the other is a polygon layer. For each polygon I need to find the three closest points. What is the best way to compile a list ...
2
votes
2answers
2k views

How to find nearest line to point using ArcGIS Desktop (ArcObjects/Python)?

I am new to building custom ArcObjects, and am looking for a custom python script for arcgis version 10 that will loop through a point shapefile to find the nearest line segment of a line shapefile ...