Questions tagged [kernel-density]
A raster-based operation that spreads point values throughout their neighborhoods.
152
questions
0
votes
0
answers
31
views
Suitable "h" parameter for the Kernel UD() function in R other than "href" to encompass all spatial points in the data
Here is my R-script that results in the attached output for 50 and 95% occupancy contours. But I am noticing how much ever I tweak the "grid", "extent" and "h" values, it ...
- 61
0
votes
0
answers
23
views
Making 3D maps in ArcMap from kernel density
I have kernel density maps which I would like this
However, my kernel density image is 2D (below) and I can't seem to find a way to change angle of my maps this way or create the maps in 3D like ...
-1
votes
1
answer
62
views
Kernal analysis R code to get 50 and 95% occupancy
I got a script from Making 95% Volume Contour on ArcMap without Hawth's Tools or GME?. Since I am a novice to R, I tailored the code (below attached pic) and have successfully to some extent put ...
- 61
0
votes
0
answers
41
views
Converting kernel density or heatmap into probability in ArcGIS
I have a question regarding kernel density estimation in ArcMap, I want to know probability of use for my species in an area.
How do I change the final kernel density raster results into 50%, 75% and ...
0
votes
0
answers
36
views
Extract 50% and 95% utilisation distribution from raster (and plot in ggplot)
I have a list of rasters, each holding a kernel density estimation with utilization distribution from animals. The cells within each raster add up to 1. I want to extract the 50% and the 95% ...
- 1
1
vote
0
answers
28
views
extract contours based on percentiles from QGIS heatmap
I have created a heatmap/kernal density estimation in QGIS. I now want to extract contours for the 75th and 90th percentile.
How would I go about doing this?
I have attached an image of what my KDE ...
1
vote
2
answers
213
views
Elongation problem with Seaborn's Kdeplot
I am currently working on creating a Kernel density estimation (Seaborn's Kdeplot) visualization of point cloud data between two countries. However, I have encountered a problem for which I need some ...
- 11
1
vote
1
answer
301
views
Explain the output of ArcGIS Pro Kernel Density tool
I am using this tool. I am an experienced GIS analyst and have read the documentation, but I can't seem to understand the output of the tool.
In my data, there is a remote area that only has 5 points. ...
- 60
0
votes
0
answers
351
views
Weighted 2D kernel density heatmap in R
I have visual observations from repeat transect surveys (individual sighting locations based on bearing and distance to transect) that I use to create 2D kernel density heatmaps. Currently I do so ...
- 153
1
vote
0
answers
82
views
Edge correction for density estimation and point pattern analysis by R [closed]
I have point data and coordinates for study area. By using R, I need to investigate:
Density of data by using kernel method (quartic kernel).
Choose the best bandwidth by using Mean Square Error (MSE)...
- 19
1
vote
1
answer
195
views
Kernel density plot in R, plot discreet values on map for specific grid cells
I am trying to highlight single 1x1 degree grid squares on a map.
It works highlighting individual grid squares for the first 1 squares but after highlight the 4th square it begins to highlight ...
- 23
2
votes
2
answers
2k
views
Create density polygons from spatial points in R
I have a dataframe with a bunch of spatial points representing flooding occurrences. I want to know which areas have the highest density of points so we can prioritize areas for management. In ArcGIS ...
- 69
2
votes
0
answers
185
views
Difference between Heatmap in QGIS and Kernel Density in SAGA
I'm trying to migrate my workflow from QGIS to SAGA so that I can automate it from the command line or a standalone Python script. Part of the workflow is running a KDE (or rather, a series of KDEs). ...
1
vote
1
answer
357
views
Data extraction from imagery in Google Earth Engine using neighborhoodToArray
I am new to Google Earth Engine and I'm working with a dataset contained multiple points with lat/lon coordinate. I want to query these points and extract the band value in the form of 2D array of ...
-1
votes
1
answer
206
views
How do I determine the distribution of my spatial data in order to choose a kernel density bandwidth estimation method?
I'm using kernel density estimates (KDE) to get animal home ranges. When researching bandwidth selection for KDE, I'm learning that it depends heavily on the data's distribution. I'd love to use ...
- 1
3
votes
2
answers
483
views
Randomly generating points using weights from raster in QGIS
I need to randomly generate 10K points throughout my region of interest, but I need to weight the point selection by a set of probability weights, stored as a raster - such that higher probability ...
- 355
3
votes
2
answers
351
views
Heat Map - Cover non-point areas QGIS
I am doing a heat map of the density of schools within a specific area of a city. Right now, I have this:
I would like to create a more formal map in which the white non-coloured aspects are coloured ...
- 31
0
votes
1
answer
531
views
arcpy.sa.PointDensity raise ERROR 000354: The name contains invalid characters
I am trying to run the PointDensity function on a feature class located in a shapefile:
[edit shp_file_path]
shp_file_path = os.path.join('path_to_shp_folder', 'shp_file_name')
if os.path.isfile(...
- 1
0
votes
0
answers
588
views
ArcMap: ImportError: No module named sklearn.neighbors
I have tried to create my own Kernel Density Estimation tool in ArcMap, but when importing the sklearn.neighbors module I get the following error:
from sklearn.neighbors import KernelDensity
...
- 1
1
vote
1
answer
424
views
OpenLayers: Change point colour to indicate number of overlapping points
I would like to have a heatmap that represents the number of overlapping points, basically to achieve the exact same thing as in this post, but in OpenLayers. At the moment I'm using opacity as an ...
- 73
1
vote
0
answers
186
views
Gaussian_KDE contour density/km^2
I am currently using gaussian_kde to do KDE on a set of coordinate points (each point represents a case). I am able to get out contours which is great; however, when I look at the actual contour level ...
- 11
1
vote
0
answers
335
views
Heatmap with Contour Polygons
I have point data off the coast of Oahu. Someone else used these same data to create two polygons (approximated by me in the figure below with the green and red hand-drawn boundary lines). I believe ...
- 230
3
votes
0
answers
420
views
How can I plot a Kernel Density Estimation in a projected coordinate system in Python?
I am trying to plot a Kernel Density Estimation calculated from a geopandas GeoDataFrame in UTM. I am using sci-kit learn's KernelDensity, because other implementations don't allow for much ...
- 121
1
vote
0
answers
2k
views
Spatial kernel density in Python
I have the data of the volume per area for Madrid.
from mpl_toolkits.axes_grid1 import make_axes_locatable
def setColorbar(ax, colormap, vmin, vmax):
divider = make_axes_locatable(ax)
cax = ...
- 269
2
votes
1
answer
1k
views
How to interpret Kernel Density Maps
In this example, kernel density maps are created.
In this
example, it is shown how to create comparable kernel density raster
maps
Now I would like to understand what are the units of kernel density ...
- 938
0
votes
1
answer
859
views
Generating Kernel density raster/stars with same dimensions
I would like to generate different rasters from kernel density functions with the same resolution, so that I can compare them.
Take this example from here:
library(MASS)
library(raster)
set.seed(123); ...
- 938
5
votes
1
answer
4k
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 ...
- 135
3
votes
1
answer
368
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 ...
- 95
2
votes
0
answers
387
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 ...
- 21
0
votes
3
answers
541
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
1
answer
277
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 ...
- 883
4
votes
2
answers
2k
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 ...
- 327
2
votes
0
answers
639
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 ...
- 155
0
votes
0
answers
84
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 ...
- 1
0
votes
1
answer
77
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 ...
- 131
1
vote
1
answer
176
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 ...
- 283
5
votes
1
answer
553
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 ...
- 51
3
votes
2
answers
2k
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 ...
- 31
1
vote
1
answer
374
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. ...
- 25
2
votes
1
answer
5k
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, ...
- 56
2
votes
0
answers
240
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 ...
- 21
4
votes
1
answer
10k
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 ...
- 41
1
vote
0
answers
415
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
vote
0
answers
83
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 ...
- 41
1
vote
0
answers
97
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 ...
- 11
0
votes
1
answer
947
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
2
answers
268
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.
- 599
6
votes
0
answers
3k
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?
...
- 233
1
vote
1
answer
145
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 ...
- 11
0
votes
1
answer
84
views
Heatmap script gives ERROR 000358 from SQL expression using ArcPy with ArcMap
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 ...
- 269