Questions tagged [kernel-density]
A raster-based operation that spreads point values throughout their neighborhoods.
132
questions
0
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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 ...
3
votes
1answer
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 ...
2
votes
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 ...
2
votes
0answers
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 ...
0
votes
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 ...
0
votes
1answer
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 ...
2
votes
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 ...
2
votes
0answers
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 ...
0
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0answers
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 ...
0
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0answers
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 ...
0
votes
0answers
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 ...
0
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0answers
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?
0
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1answer
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 ...
1
vote
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 ...
4
votes
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 ...
3
votes
2answers
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 ...
1
vote
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. ...
2
votes
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, ...
2
votes
0answers
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 ...
2
votes
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 ...
1
vote
0answers
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 ...
1
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0answers
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 ...
1
vote
0answers
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 ...
0
votes
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 ...
2
votes
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.
5
votes
0answers
975 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?
...
1
vote
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 ...
0
votes
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 ...
1
vote
0answers
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 ...
0
votes
0answers
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 ...
1
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0answers
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 ...
2
votes
0answers
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 ...
1
vote
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 ...
0
votes
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 ...
0
votes
0answers
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 ...
1
vote
0answers
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 ...
-2
votes
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 ...
1
vote
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 ...
4
votes
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 ...
0
votes
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 *...
0
votes
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 ...
1
vote
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\...
2
votes
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
...
0
votes
0answers
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'...
1
vote
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:\...
0
votes
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 ...
1
vote
0answers
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 ...
3
votes
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 ...
0
votes
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 ...
2
votes
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 ...
