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

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Single Tree detection

I was wondering how I could extract "crown area" of single trees in a forest from a high-resolution image with only 3 band (RGB) in ArcMap. ( No NIR to use NDVI as any threshold). I need a fast ...
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2answers
30 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 ...
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1answer
57 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
93 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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46 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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15 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
166 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 ...
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1answer
32 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
76 views

Convert census data to points

I have data from the Census Bureau's LEHD files that record number of jobs within blocks using the digit 1 to denote one job. I want to convert the number of 1's in the column into a feature that I ...
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4answers
110 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 ...
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1answer
85 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, ...
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1answer
45 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 ...
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114 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
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2answers
237 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 ...
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1answer
178 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
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1answer
116 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
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1answer
113 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 ...
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1answer
82 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
504 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 ...
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0answers
51 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 ...
2
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1answer
356 views

Kernel Density Error in QGIS Processing

I have been getting this error when trying to create kernel density maps using QGIS 2.0.1 and SAGA 2.1.0. It seems to occur only when the extent is large, i.e. the entire state of Texas. If I do it on ...
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0answers
201 views

Kernel density estimator - batch

I've unfortunately just found out that Hawth's batch kernel density estimator doesn't work on ArcGIS 10.1. I've installed GME - unfortunately I can't run batches as there's not tool that will do it. I ...
4
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1answer
75 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 ...
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1answer
233 views

Why doesn't the Kernel Density Estimate function appear in AniMove plugin?

can anyone tell me why the Kernel Density Estimate function does not appear under my AniMove plugin in QGIS? I can only perform the MCP. I run Windows OS.
2
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0answers
30 views

How does changing the kernel density search radius affect the units expressed in the map legend? [duplicate]

I'm trying to understand how ArcGIS 10.1 handles kernel density values and how these values are reported in the legend. For example, the following parameters were used for the KDEs in the attached ...
2
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0answers
384 views

How to Calculate Utilization Distribution Overlap Index (UDOI) in ArcGIS

I'm interested in calculating the overlap of home ranges (=utilization distributions in my case) of a bird species using sighting coordinates. This article introduced UDOI as the best index for such ...
2
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1answer
2k views

How to display relative concentration (heatmap) of point features in ArcMap?

Please bear with me here - I'm pretty new to GIS, and I'm having a lot of confusion about all the different terms I've seen thrown around. Here's my problem: I have a large dataset of point ...
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0answers
287 views

SAGA kernel density error with Sextante Modeler

I can succesfully perform SAGA kernel density analysis with Sextante (1.0.7) in QGIS 1.8.0. But i want to built an automated tool for this job with Sextante Modeler. But i got foolish errors. This ...
2
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0answers
26 views

How to interprete ArcGIS kernel density units when a population parameter is specified? [duplicate]

Possible Duplicate: How to interpret GRASS v.kernel results? The attached image shows trees in a study area based on their actual height in the field. The trees are overlaying a raster ...
10
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1answer
331 views

How to create an error map to support an average kernel density map?

I've created an average kernel density map by running KDEs on points stacked within the same spatial extent. For example, say we have three point shapefiles representing seedlings in three different ...