Questions tagged [kernel-density]

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

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19 views

Calculating 3x3 pixel Neighborhood in GEE

I'm trying to calculate 3x3 pixel kernel for each image on my NDVI image collection. My goal is to do in GEE focal statistics like in Arcgis. My code is below and it generates an NDVI image collection ...
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70 views

Point density map in QGIS

I would like to create a map of point density of vector features /archealogical sites/ per hectar in QGIS /something like in an attached figure/. I doubt if the kernel density is a proper tool for ...
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1answer
51 views

Seeking Crime Analysis Solution Tools in QGIS

I want to create similar maps like shown at the bottom but I am "limited" to QGIS only right now. My goal is to compare crimes committed in 2019 to those in 2020 in the same date window of ...
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33 views

Understanding units in Kernel Density analysis using ArcMap

I'm having trouble understanding the units from a Kernel Density analysis in ArcMap. The Context: I am analyzing how many structures will be damaged by sea-level rise in a coastal community. I have ...
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3answers
59 views

ArcGIS Pro Kernel Density takes too long

I’ve been facing an issue with the Kernel Density tool. I’m trying to make density change maps for different crime types. I'm running ArcGIS Pro version 2.6.3. I’ve done this in the past without a ...
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24 views

Kernel density estimation for frequency data on polygon level

I would like to make kernel density estimations for a variety of influencing factors on crime, but I do only have frequency data on polygon level, e.g. number of drug markets on county level. For all ...
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2answers
176 views

In Python, what is the best way to replicate the QGIS Heatmap plugin?

I would like to create a spatial weighted heatmap in Python where I have control over the boundingbox, grid size and bandwidth. In example if I want to create a population heatmap on a grid of 200*200 ...
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66 views

Having trouble with the Heatmap's (Kernel Density Estimation-KDE) interpretation in QGIS 3.10

i wanted to generate a density/concentration map of a parameter, in this case Carbon percentage in a water sample. The dataset in csv file looks like these : So, I imported the csv file then plotted ...
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48 views

Kernel Density Percentage Isopleth

I have generated Kernel Density Rasters from GPS species locations. I want to generate percentage isopleth polygons to enable me to identify core areas. I am using ArcMap10.6 and therefore cannot use ...
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30 views

Average Kernel Density as Dependent Variable in Regression

I have point pattern dataset and I estimated a kernel surface from it. I want to use a census tracts average kernel density as a dependent variable in regression analysis. Is OLS appropriate or should ...
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43 views

QGIS KDE (Heatmap) TIF file --> Open in ArcGIS in order to use Kernel Interpolation With Barriers

So I've created KDE .tif files in QGIS, but there are currently no plugins available in QGIS, which takes into account barriers when creating KDE density rasters for species. I can bring the .tif ...
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10 views

Getting rid of colored background when using point density tool

When running the point density tool in ArcMap in the layer created there is a colored background covering a specific area. Is there a way to get rid of this?
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31 views

Calculate the class limits from the kernel density depending on the percentage of the source dataset

My goal is to make the class boundary of a kernel density dependent on a percentage of the input points. Specifically I calculate the kernel density from 3000 points in a 50m x 50 m grid with a search ...
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1answer
54 views

Interpret a kernel density map for pollutants

I currently have a grid of values (concentration in ug/m^3) for a certain pollutant. I then converted each grid to a point to use as an input to the Kernel density analysis tool in ArcGIS pro. The ...
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1answer
139 views

Postgis/Postgresql - Interpolate equadistant points based on weighted attribution similar to QGIS Interpolation(Heatmap Kernal Density Estimation)

I have equadistant vector points, that are all 400m apart but only cover certain areas of a map that have a value of (1-5). In QGIS I can run the Kernel Density Estimation with my vector points to ...
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628 views

Choosing kernel density radius [closed]

I have 3 datasets with GPS points. Two of those are GPS points that represent boating activities (two different types) and the third represents turtle observations. I would like to perform Kernel ...
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1answer
81 views

Choosing tool to create raster with probability of occurence on each cell using ArcGIS Desktop?

I have two different datasets: 1) seal occurence (point data) 2) fishing boat tracks (line data) First, I need to create two density maps, i.e. one for each dataset. ...
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1answer
1k 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, ...
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92 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 ...
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1answer
4k 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 ...
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182 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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39 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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55 views

Using kernel density estimates as attributes for point data? [closed]

I have spatial point data (say addresses of all inhabitants of a metropolitan area or larger region) with context data for each point like age, gender, employment status, and so on. For each spatial ...
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1answer
339 views

Performing Weighted Overlay using vector data with no inherent values in ArcGIS Desktop? [closed]

I have been asked to do a weighted suitability analysis using all vector based polygon feature layers (8 different layers). Each layer has been ranked from 1 to 8 in order of importance. My problem ...
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2answers
125 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.
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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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1answer
41 views

Calculating Kernel Density within defined region?

I am attempting to calculate a Kernel density raster dataset from a point dataset within a defined regional boundary. However the output dataset generated is in a large square that cuts off one of the ...
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1answer
58 views

How to fix this Heatmap script from failing SQL expression (integer/string?) using arcpy (ArcMap 10.5)?

I have a heatmap script that will eventually print 10 PDF maps. At the moment it is failing at the SQL expression in the Make Feature Layer right before Kernel Density Raster creation because the ...
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86 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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581 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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62 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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462 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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2answers
1k views

Making 95% Volume Contour on ArcMap without Hawth's Tools or GME?

I have some points that represent animal locations over the course of a few months. I am emulating the work of previous researchers in this field. I'm still new to GIS, so I previously thought that I ...
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1answer
61 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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137 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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341 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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2answers
130 views

Kernel density tool does not produce an .asc output file

I have made a kernel density map in ArcGIS 10.3 and 10.5, but the output appears as an .aux file, not an .asc file (which I will need to use for occurrenceThinner). A folder appears also with a ...
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1answer
953 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 ...
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1answer
1k 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 ...
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1answer
75 views

ArcPy: Kernel Density Extend (Default + 5000 Meters)

I in my Kernel Density Loop i want the Processing Extend to be Default + 5000m Does anyone know how this might be done? This is the Code: import arcpy,os from arcpy import env from arcpy.sa import *...
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2answers
609 views

Problem with Search Radius (Bandwidth) of Kernel Density Estimate

My task is to do a Kernel Density estimation with a cell size of 500m and a search radius (bandwidth) of 500m. The search radius doesn´t seem to work though. These are the settings: This is the ...
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1answer
165 views

Saving output in ArcPy?

The loop runs once, then i get this error message. Runtime error Traceback (most recent call last): File "<string>", line 17, in <module> File "c:\program files (x86)\arcgis\...
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2answers
3k 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 ...
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50 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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2answers
422 views

Saving output in ArcPy For-Loop?

How can I save the output of my For loop so that I have a different output name each time? This is the code I´m using: import arcpy from arcpy import env from arcpy.sa import * env.workspace = r'C:\...
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1answer
330 views

Kernel Density with quantity values in bands

I have very limited knowledge of ArcMap. I am trying to use a density heat map to portray the number of incidents in an area. I have used the Kernel Density tool in ArcMap 10.1. However, instead of ...
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38 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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0answers
107 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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1answer
517 views

Network Kernel Density QGIS

I am looking to do a network based KDE to show hotspots of electrocutions along a power line network. Does anyone know of a tool/method that I can use in QGIS to do this? (I am also using OSX ...
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1answer
2k 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 ...