Questions tagged [kernel-density]

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

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12
votes
1answer
3k views

Calculating road density in R using kernel density? [closed]

I have a large (~70MB) shapefile of roads and want to convert this to a raster with road density in each cell. Ideally I'd like to do this in R along with GDAL command line tools if necessary. My ...
10
votes
1answer
541 views

How to create an error map to support an average kernel density map?

I've created an average kernel density map by running KDEs on points stacked within the same spatial extent. For example, say we have three point shapefiles representing seedlings in three different ...
9
votes
4answers
35k views

Measuring area of raster classes?

Are there any tools or methods in ArcMap that can measure the area of each level of the kernel density output? Note this is just a kernel density plot (not a shape file or polygon). Kernel Density ...
5
votes
1answer
4k views

Question about ArcGIS vs. QGIS for kernel density estimations

It appears from the QGIS documentation that the Heatmap Plugin can generate a kernel density surface from a point map and make use of the attributes of the original points to influence this surface ...
5
votes
1answer
517 views

How to use GRASS v.kernel to calculate point densities along a network?

In a road network, I need to select the segments where a minimum of 5 dots occur (1 dot = 1 address) over a distance of 100 m (the image attached illustrates my question). I'm trying to use GRASS v....
4
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2answers
178 views

How to choose a GRASS kernel density function?

I'm starting to use the Grass module on QGIS, and I want to do a heatmap, so, I'm creating a new surface using the kernel function. But, GRASS come with 7 types of kernel functions, how do I know ...
4
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1answer
4k views

How do I stop Kernel Density from cutting off symbology?

I need help configuring Kernel Density so that is does not cut off symbology on hot spots. (See pic below) I'm assuming it has something to do with the extent but I could not get it to display the way ...
4
votes
2answers
6k views

Weighted heatmap analysis- density of points, vs density of weight variable

Was just wondering if anyone could help me with a problem. I'm trying to map wellbeing scores (out of 10), using locations from a survey of 15,000 households, using the HEatmap command in QGIS. It's ...
4
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1answer
728 views

Why doesn't the Kernel Density Estimate function appear in AniMove plugin?

can anyone tell me why the Kernel Density Estimate function does not appear under my AniMove plugin in QGIS? I can only perform the MCP. I run Windows OS.
4
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2answers
769 views

95 percent volume contour

I generated, from point data, a kernel density map using GRASS, and I would like to identify the 95% volume contour in it. Is it possible in GRASS?
4
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1answer
892 views

Spatial interpolation from categorical data in R

I have a spatial point data set, where each point represents a person pronouncing a word in a specific fashion. Let's say I have six different pronunciations. In an earlier iteration, I aggregated ...
3
votes
1answer
792 views

95% contour from kernel density estimates [closed]

I am looking to calculate the 95% volume contour from a kernel density estimate to estimate an animal's home range. Normally, I work in R, but I calculated the "kernel density estimate" in ArcGIS so ...
3
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2answers
4k views

calculate kernel density for polygons in ArcGIS

I have a population data set at the census block level. My goal is to use the data set to identify some population centers in the region based on population density. The simplest way to do it is to ...
3
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1answer
1k views

Kernel Density Error in QGIS Processing

I have been getting this error when trying to create kernel density maps using QGIS 2.0.1 and SAGA 2.1.0. It seems to occur only when the extent is large, i.e. the entire state of Texas. If I do it on ...
3
votes
1answer
1k views

Kernel vs Point density [closed]

Can someone give me an example each where these two tools would be appropriate to use. I kind of understood what each of them does but can't seem to figure out examples where one would be more ...
3
votes
1answer
7k views

Displaying relative concentration (heatmap) of point features in ArcMap?

I'm pretty new to GIS. I have a large dataset of point features, all within a arbitrary geographical area (in this case, the greater San Francisco Bay Area). The point features have no other ...
3
votes
2answers
213 views

Mapserver - Kernel Density Layer - weight

I have created a map file broadly as shown below. I then created 6 points as in the DATA_TABLE. The 3 on the left have val 100 and the three on the right have val 1. When I view this layer it renders ...
3
votes
1answer
147 views

How can Ripley's K Function output in ModelBuilder be used as the search radius for Kernel Density analysis?

I am using ArcGIS 10.3.1 (Basic license). The first part of the model takes point data, runs it through Ripley's K Function tool, sorts the data in descending order by the DiffK column, and then ...
3
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0answers
105 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? ...
3
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0answers
96 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 ...
3
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0answers
691 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)...
2
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2answers
910 views

How to run for loop with unique values

Instead of two shapefiles that are saved in fcList in this loop I would like to do KernelDensity on the unique values of one shapefile. Does anyone have an idea how this might work? import arcpy,os ...
2
votes
1answer
632 views

ArcMap Spatial Analyst - Kernel Density Estimation Produces Blank Rasters

My problem is with the Kernel Density operation in Spatial Analyst. ArcMap produces blank rasters for some reason when given a normal point feature class as input. I had no problem creating the ...
2
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2answers
13k views

Creating density map from point data in ArcGIS Desktop?

I have point data, where one point represents one 1 storm water outfall, looks like this: (point data is across all of Long Island, New York). I am having a bit of difficulty finding the best tool ...
2
votes
1answer
1k views

Creating a Heatmap Raster GeoTIFF in R

Is there a way to create a raster heatmap (aka 2d kernel density) from point data in R which can then be exported as a geoTIFF file? I'm able to create a heatmap in R easily using ggplot2's ...
2
votes
2answers
1k views

Heatmap using Kernel density estimation

I have been trying to generate heatmap using kernel density estimation from python console in QGIS. This is command i'm using: processing.runandload("saga:kerneldensityestimation", "D:/test/Towns....
2
votes
1answer
264 views

Kernel density estimation across multiple UTM zones [closed]

I'm trying to compare the spatial distribution between two groups of fishing locations (for each of several different years) in the Bering Sea (lat's ~53 to 65N, long's ~ -178 to -158W. My preliminary ...
2
votes
1answer
144 views

How to explain the spatial relation of forest loss hotspots with several others variables

I am doing a research in categorizing and ordering of the factor affecting/fostering the creation of the forest loss hotspots. I have following data. Point location of forest losses from which i ...
2
votes
1answer
170 views

How to enable LSCV bandwidth on AniMove 1.4.2 (QGis 2.14.4)?

I'm trying to make some Kernel Analysis for animals home range and the option "LSCV" of bandwidth selection isn't appearing, the plugin give me only three options (rule of thumb (Scott), rule of thumb ...
2
votes
1answer
82 views

errors when creating for loops for KDE in GME

I am trying to create kernel density estimates for bird territories over a number of years. So I have all of the x,y coordinates that mark the locations of each bird in my spreadsheet, and columns for ...
2
votes
1answer
638 views

Trouble with kernel density estimation

I have been trying to find out how to make the SAGA and GRASS kernel density tools work in QGIS 2.8. I have had a lot of trouble trying to get them to work as they produce useless results seen below. ...
2
votes
1answer
944 views

How to do a Kernel Density with “population field” in r?

In ArcGIS, I can generate a kernel density map and weigh it by population field. For example, I can use city's population as weighting factor, so that more populated city has higher influence to the ...
2
votes
1answer
48 views

Plotting density map of points?

I have some points and I would like to plot the density map of them. I have tried like this: plt.figure() xedges = np.linspace(540000, 550000, 20) yedges = np.linspace(5200000, 5500000, 20) H, ...
2
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0answers
15 views

Making informative legend for Kernel Density Estimate in QGIS?

I have used heatmap (kernel density estimation) in QGIS 3.0.1 to make a heatmap of boat counts. In my point data-each point is one boat. Then, in my kernel, I have used a 500m radius, with 500m pixel ...
2
votes
2answers
59 views

Tools to conduct Kernel Network Density estimation in an ESRI environment

Are there any tools or resources to conduct Network Density Estimation using ArcGIS 10.5 or ArcGIS Pro? I've found this tool http://sanet.csis.u-tokyo.ac.jp/ but it only works on version 9 - 10.2.
2
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0answers
306 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 ...
2
votes
0answers
435 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,...
2
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0answers
252 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....
2
votes
0answers
125 views

Calculating Kernel Density output values based on parameter value in ArcMap? [closed]

I am generating a map where I have sentiment value for geo-tagged data. I want to show a heat map based on the sentiment of location. I am using kernel density to generate this map. I am having ...
2
votes
0answers
198 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. ...
2
votes
0answers
751 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 ...
2
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0answers
553 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 ...
2
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0answers
165 views

How does changing the kernel density search radius affect the units expressed in the map legend? [duplicate]

I'm trying to understand how ArcGIS 10.1 handles kernel density values and how these values are reported in the legend. For example, the following parameters were used for the KDEs in the attached ...
2
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0answers
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 ...
2
votes
0answers
90 views

How to interpret ArcGIS kernel density units when a population parameter is specified? [duplicate]

Possible Duplicate: How to interpret GRASS v.kernel results? The attached image shows trees in a study area based on their actual height in the field. The trees are overlaying a raster that was ...
2
votes
1answer
959 views

Meaning of legend value in Kernel Density? [duplicate]

I have done some analyses on the spatial distribution of traffic signs using kernel density, I used SQUARE_KILOMETERS in area unit, the output is good and clear, but I don't understand the meaning of ...
1
vote
4answers
5k views

R Spatial Kernel Density Estimation

I am new on spatial kernel density estimation with r and need some suggestions. Saying, I like to estimate the density for some event occurring at a location, for example, the probability of ...
1
vote
3answers
982 views

Calculate employment density using LEHD Census Data in ArcGIS

I have data from the Census Bureau's LEHD files that record number of jobs within blocks groups. I want to convert the number of data in the LEHD into a feature that I can use to calculate block ...
1
vote
1answer
69 views

Plotting a heat map onto background in python using kde?

I have a geodataframe with points within the united states. Each point has a geometry attribute as well as a value. I would like to plot a heat map based on these values on top the map of the united ...
1
vote
1answer
414 views

Determining search radius used in Kernel Density analysis?

When conducting kernel density analysis in ArcGIS (10.2) if you leave the search radius field blank I realise it uses a default based on an algorithm. Is there any easy/quick way to find out what ...