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Questions tagged [kernel-density]

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

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21 views

Kernel density units ( events per unit area) conversion to count (events per cell) [closed]

I'm trying to convert my raster values on each cell so that they represent events per cell and not the default in Arcmap events per unit. I know that I could do that with Identify tool, but ...
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1answer
23 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
53 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 ...
2
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1answer
50 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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0answers
17 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
79 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 ...
3
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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 ...
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0answers
19 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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0answers
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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2answers
726 views

Kernel Density Tool - Can't change Area Unit?

When I pull up the Kernel Density tool in ArcMap Desktop 10.5.1 I can choose different options for the Area Unit. As soon as I choose a point input feature class, this feature becomes grayed out and ...
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0answers
18 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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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.
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1answer
42 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 ...
3
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0answers
116 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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1answer
20 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
52 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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0answers
228 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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65 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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0answers
68 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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2answers
269 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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0answers
205 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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1answer
896 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 ...
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0answers
34 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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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 ...
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0answers
310 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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0answers
315 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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0answers
38 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 ...
1
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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 ...
12
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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 ...
1
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1answer
423 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
177 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 ...
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2answers
109 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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0answers
109 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 ...
3
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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 ...
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3answers
988 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 ...
3
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1answer
800 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
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1answer
241 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 ...
0
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1answer
67 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
394 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
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1answer
112 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
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2answers
939 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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0answers
43 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
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2answers
214 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:\...
5
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1answer
519 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....
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0answers
31 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
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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 ...
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1answer
378 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
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1answer
966 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 ...
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 ...
1
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1answer
291 views

Why does connect to Excel spreadsheet through ArcPy give ERROR 000582?

My ultimate goal is to automate kernel density analysis on xy data from a table. I am trying to learn Python but I am very new. I built a simple model to take table data and display xy data. When I ...