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2
votes
1answer
31 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
votes
1answer
115 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
37 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
70 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
29 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. ...
0
votes
0answers
32 views

How do I assign parameters for gdal proximity in QGIS?

I used to use the Proximity (Raster distance) option from the QGIS Raster menu a lot, which evidently corresponds to the commandline command, gdal_proximity.py. I'd like to be able to now use this ...
0
votes
0answers
22 views

QGIS - identifying polygons and distances along the edges of a superset

I have two layers of polygons. layer A is a superset of dissolved polygons from my other layer, B. Using QGIS, how can I determine polygons in B, that lie along the edges of A? There would be some ...
3
votes
1answer
124 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 ...
2
votes
1answer
123 views

Trying to determine distances between mulitple points

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
145 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
28 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. ...
9
votes
1answer
200 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 ...
2
votes
2answers
44 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 ...
4
votes
0answers
157 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
197 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 ...
12
votes
2answers
1k 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 ...