Questions tagged [kernel-density]

A raster-based operation that spreads point values throughout their neighborhoods.

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62 views

Why do the Heat Map (QGIS) and Kernel density estimation (SAGA) tools provide different results?

The Heat Map tool (QGIS) and the Kernel Density Estimation tool (SAGA) provide different results for the same data as shown below. Why is this happening? Is one of them more conceptually correct? ...
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92 views

Kernel density estimate with physical boundary

I'm am using adehabitatHR to estimate the size of the foraging range of seabirds using telemetry data. Is there anyway to take into account a physical boundary, where it is impossible for the animals ...
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655 views

Heatmap Kernel Density QGIS

I am trying to understand the output of the heatmap tool of QGIS (kernel density). For this reason I created a kernel density map for a single point that has a projected coordinate system (epsg: 21781)...
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293 views

Choosing bandwidth and scaling factor for Kernel Density Estimate in ArcGIS Desktop?

I have some points that represent animal locations over the course of a few months at the scale of ~20 sqkm. I am emulating the work of previous researchers in this field, but I'm having trouble ...
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424 views

R code for Kernel Density Estimation

During the process of doing kernel density in R, using UK crime data as data set. Below is the work I have done so far but encounter some issues: library(ks) library(raster) data1<-subset(data,...
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238 views

Kernel Density with vector output and/or possible automation?

I'm currently working on a project that will have me calculate the kernel density of a number of shapefiles with varying parameters. My current workflow goes like this: Import shapefiles in QGIS 2.10....
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193 views

How do I calculate kernel density using cases and controls in QGIS?

I have a dataset with approx 1250 geolocated points - approx 150 are cases of a disease and the rest are controls. My area of interest is around 20km by 20km with wide variation in population density. ...
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741 views

Comparing two kernel density rasters for areas of interest?

The background to my question is that I have unit sales for Product A aggregated by city. I also have unit sales for Category A aggregated by city. The goal is to compare areas where Product A ...
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552 views

Normalization of Kernel Density Estimate rasters in ArcGIS 10

I've been told by several GIS instructors that the pixel values of a Kernel Density Estimate raster output by the point KDE tool in ArcGIS 10.1 represents the probability of encountering a point, not ...
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1k views

How to Calculate Utilization Distribution Overlap Index (UDOI) in ArcGIS

I'm interested in calculating the overlap of home ranges (=utilization distributions in my case) of a bird species using sighting coordinates. This article introduced UDOI as the best index for such ...
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11 views

Kernel Density Estimate on point data in degrees (scikit-learn)

I am estimating point density, where I am having point coordinates in degrees, I need a raster(over the extent of these points) which provides a density estimation on each cell. I have tried on R but ...
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30 views

Created heatmaps are not displayed

I created a few heatmaps based on 2 different shapefiles( point layers). Then I joined the data from the 2 shp files, the joined file looks perfectly fine. I created a view heatmaps based on the new ...
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62 views

Unique values from Kernel Density

I have calculated Kernel Density for feature class "fc" using following code: dens = KernelDensity(fc,"NONE", 1, SearchRadius, "SQUARE_METERS", "DENSITIES", "PLANAR") The raster attribute table: I ...
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35 views

Modelling habitat heterogeneity in space: R function

I'm working on spatial landscape simulations and I would like to simulate a landscape where habitat quality varies in space. I did already some simulations assuming a landscape with higher habitat ...
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211 views

Showing specific kernel density contours using QGIS Animove?

This is more a graphics question (I calculated all the important stuff in R), but is it possible to edit the Kernel Density Estimation (KDE) output layers given by the Animove plugin to show only the ...
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29 views

How to interpret v.kernel network results

v.kernel "Optionally generates a vector density map on a vector network." I have done this for a network, but I don't understand how to interpret the output of this. Can anyone explain this? I am ...
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111 views

How to use bandwidth matrix from R in Kernel Density tool in ArcMap?

I want to calculate and map kernel densities using ArcGIS (10.5 so I am unable to use GME). I calculated a bandwidth matrix using the plugin method in the ks package in R. How can I input and use that ...
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65 views

Error while using kde function in GME

Not sure if anyone else has encountered this error. I'm trying to use the kde command to generate some kernel density raster layers based on a shapefile. The error reads as follows: Error: An ...
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184 views

Calculating Kernel Densities Using A Loop in Geospatial Modeling Environment

I'm currently trying to loop through my shapefile of telemetry locations to calculate kernel densities using the 'PLUGIN' bandwidth. I tried the following code in R to create a script that can be ...
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38 views

Seasonal changes in habitat use from radio tracking data - how to analyse?

I've been given some data to analyse on deer movements. I have data for the movements of 10 deer over a year period. There are 35 GPS locations per dear for each season (4 seasons). I would like to ...
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62 views

Point Density Percentage Changes

I'm hoping to find out the methodology for mapping increases and decreases in point based occurrences from multiple tables. Eventual output: A map displaying point density/kernel density increases ...
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131 views

Calculating density using information linked to polygons?

I'm fairly new at GIS and am using ArcMap to calculate the population density of lizards on an island. On our island, we have about 80 trees, and each tree is mapped as a polygon on a single layer. We ...
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137 views

Using Ripley's K-Function and Kernel Density Estimation?

Having issues applying Ripley's K-Function and Kernel Density to apply to ACLED (Armed Conflict Location & Event Data) point pattern analysis. The issues relates to how do you know the correct ...
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60 views

Create a correlation between different point dataset

I have different point data-sets in my map in ArcMap, but I am wondering if there is an tool in ArcMap that can analyze the correlation between the different data-sets. Specifically, I need to know ...
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397 views

Kernel Density (KDE) Issues and GME Errors: “Failed to create raster dataset” and “Arithmetic operation resulted in an overflow.”

I'm trying to create 50% and 95% core and home ranges in GME and am running into some problems. First, when I try to to create my KDE raster, occasionally I get a "Failed to create raster dataset" ...
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93 views

How to do a Kernel Density map from weighted point observations using a Cauchy kernel?

I need to produce a kernel density map, but instead of using a common kernel function such as Gaussian, I need to use the Cauchy kernel function. I have tried the Kernel Density tool in ArcGIS and ...
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29 views

Is there a lower bound on the std deviation for v.kernel in GRASS?

I'm using the v.kernel function in GRASS to create heat maps. I am able to generate an acceptable heat map using a std deviation of .2 and a several thousand rows and columns. After the map is ...
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248 views

Kernel Density Estimation Crimestat

I calculated a series of Kernel Density Estimations in CrimeStat (because more parameters can be set than in the built-in tool in ArcGIS) and then imported the results into ArcMap. I wanted to combine ...
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203 views

Trouble interpreting zonal statistics as table output

Consider this a follow-up to this question. I transformed a census block group vector map (decided to use this instead of census tracts) into a raster map and generated a kernel density map using ...
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189 views

How to calculate x and y variance values?

I'm trying to define the best suitable cell size to use in the kernel density estimation in the Geospatial Modelling Environment (GME) for ArcGIS. To calculate the best suitable cell size the ...
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32 views

QGIS Heat Map output not correct

Fairly new to QGIS here. I'm having trouble creating a heat map in QGIS3 from a set of points. I've followed what others have done online (e.g.: https://www.youtube.com/watch?v=o9Gqrr5cYrY) but in my ...
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56 views

Understanding output of Kernel Density Estimate from AniMove?

I found the AniMove plugin for QGIS to do the Home Range Analysis for Dolphins. I load all the points of the sighting, and perform the task using the plugin. I got the contour as polyline, and ...
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298 views

Estimate spatial kernel density from raster and output kernel values in a grid

I would like to use a raster map (find below) to estimate or create a kernel density distribution. The objective is to extrapolate the kernel density function and re-use it in order to distribute a ...
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1answer
51 views

Site density related to river vicinity

I use ArcGIS 10.1. I have a shapefile with sites and another with the rivers of the area. I would like to calculate the density of the sites related to the river vicinity. Is it possible? Which type ...
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55 views

ArcGIS-GME error when using “kde” tool

I need to estimate home ranges and I want to use the KDE with the plug-in bandwidth, using ArcGIS 10.1 + GME. I get an error when I run the command and I believe it may be related with the output ...
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102 views

From Kernel Density to a polygon that covers 80 % of points

I have a set of occurrences as points in a district. I used Kernel Density tool, to show the areas of various densities. I also want to create one polygon that covers X % of points. I've tried the ...
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39 views

Correcting for correlation of kernel density of events to that of their distance from separate feature using ArcGIS Desktop?

I have a kernel density raster of recorded events. These events are correlated to their distance from a linear feature. In other words, density is higher near this line because it is a 'starting point'...
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1answer
160 views

Network Based Kernel Density estimation Guiding Module for ArcGIS Desktop?

I need a guidance module for performing Network Based Kernel Density Estimation in ArcGIS 10.5. When I was going through several answers here, I saw Nearest Neighbor Analysis for route events about an ...