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

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1answer
12 views

Automating Isopleths in GME?

Is there an easy way to batch generate isopleths in GME? I have a set of 109 different kernel density estimates that I need to make 50% and 95% isopleths for, but in the interest of saving time and ...
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0answers
41 views

Calculating the spatial variance of well density? [closed]

I have wells as a point shapefile and have calculated the spatial density of these wells in 400+ basins (polygons) by dividing the number of wells in each basin (found by doing a spatial join) by the ...
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1answer
18 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 ...
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0answers
30 views

How to compare distributions to determine if facilities are in the best location to serve the population? [closed]

I am using ArcGIS 10.3 for this project. I am interested in determining how well (coverage or overlap) testing facilities serve high disease prevalence neighborhoods. I geocoded both the testing ...
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2answers
75 views

How can one retrieve all the raster cell values for Kernel Density output?

This question is related to the replies in this earlier thread (How to interpret GRASS v.kernel results?). I am new to GIS mapping (arcGIS) and have been trying to work with the Kernel Density ...
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47 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 ...
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0answers
40 views

How to do a Kernel Density map from weighted point observations using a Cauchy kernel?

I need to produce a kernel density map, but instead of using a common kernel function such as Gaussian, I need to use the Cauchy kernel function. I have tried the Kernel Density tool in ArcGIS and ...
3
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1answer
72 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 ...
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0answers
14 views

Trying to perform kernel density analysis but obtain: 'error all input points identical' or 'error in executing grid expression' [duplicate]

I am trying to perform a density analysis of a point shapefile on ArcMap. I am unsure of what to insert for population field. I've tried the actual number of people in the census tract where my point ...
0
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1answer
32 views

for loops in GME

I creating home ranges for wolf packs utilizing the kde, isopleth, and cliprasterbypoly tools in GME. I have no problem running through these one at a time; however, I would like to get the process ...
2
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0answers
43 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. ...
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0answers
35 views

Reclassify a density surface a variable range of values

I have a set of points with a 'weight' value. I want to create a density surface from these points, classify it with 5 or so bins (actual number is arbitrary, but smaller than the default output ...
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0answers
42 views

CrimeStat Kernel Density Intensity Value

I am having difficulties computing Kernel Density Estimations. I want to use a column in my shapefile as an intensity value (Z-value). I computed another KDE without intensity values, but when I ...
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0answers
25 views

Is there a lower bound on the std deviation for v.kernel in GRASS?

I'm using the v.kernel function in GRASS to create heat maps. I am able to generate an acceptable heat map using a std deviation of .2 and a several thousand rows and columns. After the map is ...
1
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0answers
94 views

Kernel Density Estimation Crimestat

I calculated a series of Kernel Density Estimations in CrimeStat (because more parameters can be set than in the built-in tool in ArcGIS) and then imported the results into ArcMap. I wanted to combine ...
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0answers
117 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
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1answer
210 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 ...
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3answers
886 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 ...
2
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2answers
386 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", ...
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0answers
100 views

Kernel density change detection

I want to detect change in two kernel density estimation rasters of animal sightings. These were created using the same bandwidth (and I'm assuming the same kernel function?) in ArcGIS 10.2. I want to ...
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0answers
97 views

How to do NETWORK kernel density in ArcMap for road crashes?

I wish to know steps to be followed for carrying out NETWORK Kernel Density Estimation (KDE) in ArcMap (Arc GIS 10) for point events (road crashes). In ArcGIS 10, there is command do kernel density ...
0
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1answer
71 views

Which suitable buffer distance to choose for a kernel density analysis to deal with edge effects?

I would like to run a Kernel density analysis on point features in ArcGIS 10.2 for hotspot detection, and to do it is recommended to apply a buffer zone to the study area in order to reduce the edge ...
0
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1answer
98 views

Kernel Density Estimation - CrimeStat - lat lon mismatch

I currently conduct kernel density estimation for a point dataset. For the KDE in addition a reference file is needed, where the coordinates of the lower left and upper right are specified. The ...
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0answers
91 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 ...
7
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1answer
675 views

Calculating road density in R using kernel density

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
345 views

How to do Network Kernel Density Estimation Analysis in ArcGIS for Desktop?

I am looking at doing some analysis of road traffic collisions. Obviously collisions occur on stretches of roads and I was researching the best methodology to take into account the network element of ...
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0answers
189 views

Kernel vs Point density

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 ...
2
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1answer
355 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 ...
0
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1answer
98 views

KDE looping in GME

I can not get this for loop to run in GME because i is being changed to 1 and , out is not recognized: wd <- "C:\Users\name\Desktop\KDE\2011\"; for (i in 1:15) { ...
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1answer
191 views

GME: could not open input point data source

I can not get this for loop to run in GME because i is being changed to 1 and , out is not recognized: wd <- "C:\Users\name\Desktop\KDE\2011\"; for (i in 1:15) { ...
2
votes
1answer
124 views

Kernel density estimation across multiple UTM zones

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 ...
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2answers
132 views

Creating Centroid Long and Lat points for each Kernel Density cell

I am trying to create a point raster file of the highest (red) kernel densities (figure 1), which places one GPS location at the centre of each of the cells within the highest kernel density bins. I ...
4
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1answer
1k 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 ...
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1answer
703 views

How to find highest kernel density point

I've been using spatstat to analyse point patterns in R. Here's an example to put this in context: library(spatstat) library(maptools) # to convert sp class to ppp Some point data: set.seed(1985) ...
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0answers
299 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 ...
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0answers
25 views

Kernel Density Analysis using R and ArcGis [duplicate]

I am doing some Kernel Density Estimations, and like everyone elese I face difficulties with setting the bandwidth to create georeferenced rasters. ArcGis (10.1) does it just fine, but it has no ...
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2answers
4k views

Creating density map from point data?

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 ...
1
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1answer
51 views

Measuring averages of a seperate layer with kernel Density overlay

How can I get an average of another layer in a kernel density plot? I have bathymetry underlying my kernel density plot and need to know how to gain an average of bathymetry for a 80% kernel. Does any ...
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2answers
298 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 ...
4
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4answers
5k 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 ...
0
votes
1answer
288 views

Projecting GCS Australian 1984 to WGS 1984 UTM (or similar) to get units of meters?

I am currently trying to run a kernel density analysis and need to change the co-ordinate system to a UTM measurement in order to set some meaningful biological constraints to my seabird data (eg, ...
0
votes
1answer
63 views

How to output parts of layers (shapefiles) that do not intersect using ModelBuilder?

I have two layers (shape files) that I want to select what do not intersect, to after all make a kernel of it. How do I do that in ModelBuilder without scripting? If someone can help me, even ...
2
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0answers
292 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
votes
2answers
2k 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 ...
1
vote
1answer
908 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
392 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? Thank you
1
vote
1answer
219 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 ...
0
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1answer
173 views

Why does Kernel Density fail in model with ERROR 000865?

I am attempting to build a model using variables for automation. (see below) The problem I am having is when the model attempts to run the Kernel Density. It seems as if the Kernel Density will not ...
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2answers
2k 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 ...
1
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0answers
130 views

How to calculate x and y variance values?

I'm trying to define the best suitable cell size to use in the kernel density estimation in the Geospatial Modelling Environment (GME) for ArcGIS. To calculate the best suitable cell size the ...