Questions tagged [density]

A density map depicts a number of objects per unit area.

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Building raster (population density) dependend diagram in QGIS

I'm using QGIS and trying to solve the following problem. I got 2 layers: population density raster point layer with the information about number of people could be hosted/served etc in this points. ...
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618 views

How to measure the compactness of a set of points

I'm looking for ideas on how to measure the compactness of a set of points. The idea is similar to identifying clusters, but instead I want to compare two distinct sets of points and return a measure ...
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660 views

Get all locations of Panoramio photos in a given extent

To create a visual quality heat map I'm trying to get a list of all Panoramio photos in an about 2000 Km2 wide study area. My idea is to perform a density analysis in GIS on a point shapefile ...
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91 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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344 views

Reducing the density of points based on zoom level

I have a Polyline like the one shown in the example, representing the path of a vehicle. GeoJSON markers show the vehicle's position over time. How can I reduce the density of the markers when the ...
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414 views

Identifying activity places in GPS trajectories using R?

Is there a way in R (a script or package) that would allow identifying activity spots in GPS tracking data? I have a number of GPS tracks in GPX/CSV formats that follow the movements of people in a ...
1
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1answer
13 views

Density analysis with two polygons in ArcGIS Pro

I'm a Norwegian student currently conducting a series of site analyzes for a city. In that context I wish to create a building density map but struggle a bit to find out how. I have made a fishnet ...
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32 views

Point density with ModelBuilder

Now I have a lot of files that contain XY coordinates, like the picture, but this picture just contains one day. However, I want to integrate all the files I have. Secondly, I want to integrate all ...
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1answer
57 views

Calculating density within a shapefile (in R)

I'm trying to calculate density within a shapefile, but I'm fairly confident I'm doing it wrong. The idea is to figure out which geographical regions there have been the most sales by density. Here ...
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36 views

Making density map based on number of hospitals in statistical area using ArcGIS Pro

I have the longitude and latitude of hospitals in Australia and I want to make a density plot (Symbology - graduated colours) to visualise the distribution of hospitals by a statistical area (defined ...
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44 views

Calculating route length per grid cell using fishnet

I have a problem determining the length of the routes (boat) I've surveyed in order to calculate the survey effort. I added the GPS points of the boat and then used the points to line tool and added a ...
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193 views

Calculating built-up density for each cell in vector grid in QGIS?

I have two layers: a raster of India showing built-up areas (black pixels represent built areas) and a vector grid overlaying it. My goal is to calculate the percentage of built-up surface in each ...
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108 views

Applying mask to Kriging shape in ArcGIS Desktop?

I'm trying to apply an mask to a Kriging image for after apply a Density Sampling Network, but unfortunately I'm not getting good results. I tried to apply on mask on Density Sampling Network and is ...
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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 ...
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228 views

ArcGIS - Point Density with Geocode data - not working

I would like to create a simple density map based on a geocoded data but the output shows up as blank. Below are steps I took: Add data - Import raw data based on Excel which has postal code (field: ...
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70 views

Point Density Percentage Changes

I'm hoping to find out the methodology for mapping increases and decreases in point based occurrences from multiple tables. Eventual output: A map displaying point density/kernel density increases ...
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176 views

Calculating density using information linked to polygons?

I'm fairly new at GIS and am using ArcMap to calculate the population density of lizards on an island. On our island, we have about 80 trees, and each tree is mapped as a polygon on a single layer. We ...
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53 views

Urban Center Boundary

I want to create an urban center boundary (in ArcGIS v10.3) by using a population-grid dataset. So, I selected high density cells, that is to say cells with population over 1.500 and hereupon I want ...
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35 views

Calculating intensity of a 0…1 scale

I'm trying to come up with the Intensity value for the Cells dataset (Diggle 1983). This dataset has coordinates from 0 to 1, probably percent, there is no actual unit to it as I think it was taken ...
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70 views

Is Hot Spot analysis appropriate if you see hot spots in areas that you would expect to see them in?

I am working with vessel position data on ArcGIS 10.0. My customer has requested density analysis maps. I was curious if hot spot analysis would be a more appropriate analysis? The study area is along ...
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912 views

Trying to Create a Global Choropleth Population Density Map then add Biodiversity Level

I am trying, quite unsuccessfully, to create a global choropleth population density map for a specific 120 countries, using ggplot2. Once I have created this choropleth map, I want to add number of ...
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729 views

Find area with highest relative density of one type of object

I'm using PostgreSQL/PostGIS and I have an advanced type of query. My database contains two types of object - let's say pubs and churches :) Is there a way that I can find the area with the densest ...
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1k views

How to fill in the parameters for kernel density estimation?

I am desperately trying to calculate animals home range with kernel. Unfortunately, the result is obviously incorrect and I cannot identify my mistake (I would like to post a screenshot but its not ...
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59 views

how can i plot news stories to show how many stories include each country on a map of the world

We have a table that shows the number of news stories that include particular countries over a set period of time there are three news channels that we have this data for and we would like to show/ ...
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59 views

Dot density map using OpenLayers

I want to show cluster of point data on map using OpenLayers. I have been following this example https://openlayers.org/en/latest/examples/earthquake-clusters.html but the problem is that want a look ...
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16 views

QGIS: creating TIN from raster with a specific point density per m²

I have an elevation data from Laser Scan with 8 points/m2 density. To lower the computation time (and to transfer it to another Software) I want to create a TIN file with density of 0.5 points / m². ...
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14 views

Calculating Bike Lane Density for each Census Block Group using ArcGIS Pro

How do I calculate the Bike Lane Density (existing bicycle facility miles in each block group divided by the area (in square miles) of the respective block group)? As shown in the image below, I have ...
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19 views

Population data to Population Density Raster Data

I'm currently using QGIS 3.16 for desktop. I have the population data of a district in excel ( number of inhabitants of a district) as well as openstreetmap raster. I am wondering if there is a way to ...
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62 views

How do you convert SpatialPoints object to PPP object?

I have a shapefile layer of polygons (houses in a city) that I want to run a kernel density on using the density() function in spatstat in R. To get my polygons as points I turned them into ...
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27 views

Seperate building-layer into buildings within villages and remote buildings using QGIS

im trying to seperate a building-layer into two layers. One layer should show the buildings within villages and the other one the remote buildings. My first approach was to buffer the buildings (and ...
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18 views

How do I show metrics (e.g., population density, counts, literacy rate) based on a custom polygon/shapes?

I currently have the GeoJSON files containing the census/administrative polygons and metrics associated with them. However, I want to add the ability to view that same data with custom polygons. For ...
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20 views

How to output a raster of special case's distribution with regard to overall distribution?

For example, the crime scenes are unevenly distributed in a city. Each case's scene can be represented as a point. Thus, we can generate a raster map, which shows the crime scenes' density in this ...
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30 views

Creating density map of roads for each district using ArcGIS Desktop?

I have to illustrate a map with the road density of each district. I have the city layer which comes with the bordered districts and another layer with all the roads. How can I create a density map ...
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34 views

Modification of Line Density using ArcGIS Desktop?

I am using ArcGIS Desktop 10.1. I need to calculate Line Density for polyline vector but the "Search radius" option must be replaced by something like the Neighborhood option in Focal Statistics. I ...
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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 ...