Questions tagged [density]

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

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Plotting a yearly average density map in ArcMap 10.8

I have one million rows of lightning data that covers 5 years (2017-2021), and the data includes latitude, longitude, and current. I used the latitude and longitude to create yearly maps in ArcMap ...
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Kernel Density Estimation in arcpy for simulation data

I have been trying to work with simulation data using Kernel Density estimation in arcpy. The simulation data is generated by numpy package:random.multivariate_normal and therefore i can get the true ...
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Extracting points by values in DIVA-GIS

I am currently working on a project which looks at the nesting density of a migratory seabird found to nest in colonies on beaches. I am aiming to see whether the nesting density of the birds has an ...
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Lineament density and drainage density

I want to calculate drainage density and lineament density in sq Km/Km2, where I am unable to change default setting i.e., square map unit (I have downloaded DEM file from USGS earth explorer, I am ...
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Showing density of vector layer with polygons inside boundaries of another in QGIS

In QGIS I've got one layer showing local authority boundaries across the country (UK), and another which shows polygons of particular sites across the whole country. Can I show the density of the ...
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Comparing Heatmaps over time

We have a huge dataset of mobile users (tourists) and want to see how the density in a city has changed (from one spot to another) before during Covid. Of course we can create a heatmap for different ...
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Plotting density map in square kilometers using ArcMap

I need to plot a lighting flash density per square km in a country map using ArcMap 10.8. I have the shapefile (shp) of the map and I have the lightning flash data with location (longitude, latitude). ...
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Create density map with grid

I want to create a map as shown in the image, where every grid cell shows the number of points (from a point shape layer) that are within a grid cell. The number of points in a grid cell shall be ...
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Why do lidR and LAStools report different point densities?

Why do lidR and LAStools report different point densities? For a .las that I have here. Both report number of points correctly at 12500 pts. The CRS is set and both also report it correctly. But for ...
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Creating Density Map using Hexagonal Grids in QGIS

I have residential density (number of dwellings/area) data for several areas. I want to create a density map using hexagonal grids. I have extracted the hexagonal grids according to the area extent ...
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Tree Density Calculator

In Tree density Calculator in QGIS what format is the 'Image' requested. I have a GeoTIFF image that I would like to calculate the tree density.
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Rasterizing overlapping buffers in QGIS

I have a vector layer of multi-ring buffers in QGIS, where each ring contains a different cooling intensity value for a green space, at distance intervals of 30 meters moving away from the green space ...
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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 ...
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Creating density map on Google Earth Engine

I'm trying to make a building-density map for Africa. Currently, I have polygons representing each building. var t = ee.FeatureCollection('GOOGLE/Research/open-buildings/v1/polygons'); // t ...
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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(...
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Hexbins missing points, layer extent problem in graphical modeler?

I am attempting to produce a density map by aggregating points over a hexagonal grid using a processing model as in a tutorial by Ujaval Gandhi (http://www.qgistutorials.com/en/docs/3/...
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Euclidean distance to point features results in empty output (no attributes)

I have a shapefile of points which contains attributes of data, I am trying to calculate Euclidean distance to the feature however the result contains no data. I also tried to clip the points to a ...
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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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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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Road density calculation

I have a vector layer of about 62km^2. I have a vector layer of roads within that area. How do I calculate the road density (km/km2)? I did a union between the road layer and the area layer, then I ...
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Compute area coverage density estimate from very large polygon dataset

I am trying to come up with a pipeline for turning very large OSM PBF files (eg buildings layer for a whole country: ~100M polygons) into a more manageable density estimate (with arbitrary precision). ...
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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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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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3 votes
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Area Density Heat Map QGIS

I would like to make a heat map of "building density" based on the area of the building footprints (I have them in a geojson as polygons) in relation to their "non-building" ...
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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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QGIS town label density

I'm composing a map of Big Island, Hawaii in QGIS 3.14.0 and would like to display major roads and cities + towns. Therefore I downloaded necessary information via QuickOSM. However, as many towns lie ...
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Stat_density_2d density plot seem to show too high density values for a small dataset

I'm working with a two-column data.frame with the columns containing x and y coordinates (Longitude, Latitude). A simple way to visualize a density map is by using the 'stat_density_2d' function. When ...
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Line density for mulitple commuters in QGIS

I have a layer with multiple lines, one city area commuting to another. This means that on some roads there are multiple lines lying on top of eachother, which at some point will split. I also have ...
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Sources for population density map of Europe

I want to make population density map for EU where I can show populations of people aged about 65yrs, where can I get a EU shapefile and population Excel file? Is there any EU shape file available ...
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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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3 answers
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Population density: 1000 people/ km2

What does it mean when in certain publications they write population density (1000 people/km2)? Does it mean that they calculate the population density by dividing the number of people by the area of ...
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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 in which geographical regions there have been the most sales by density. Here ...
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How to create density scatter plot from dataset for pairgrid in Python

I'm trying to compare the values of each pixel in relation to each band to create a scatter plot of density. First I extracted the values from the image to form an array, then I created a dataset. ...
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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 ...
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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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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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Producing density map in QGIS

I have placed a grid onto an open source Ordnance Survey map that corresponds to Ordnance Survey Eastings and Northings. I have a value for each grid square between zero and 30. How do I use these ...
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QGIS 3 building density calculations

I have layer of buildings (polygons), and in attribute table contains number of buildings, floor area of buildings etc. I would like to know how many buildings (#) is per Ha or km2, and building area ...
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Kernel Density Estimation Weighting Factor

I don't understand where is this weighting factor coming from, does it need to be in the quakeLyr in the attribute table named with "mag" or? # Now, we can run the kernel density estimation algorithm ...
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Converting Raster Density File into Point using ArcGIS Desktop?

I used the Point Density tool to create raster files. I plan on scaling these density values by dividing them by the greatest density value and then multiplying the result with a certain value that is ...
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3 votes
1 answer
550 views

Find EPS for DBSCAN

I have location posts from Instagram Data and want to cluster them by density - using DBSCAN. I played around quite a lot with different minPts and eps but never receive clusters (always one big ...
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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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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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1 vote
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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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2 votes
1 answer
358 views

Identify most densely populated areas along streets with QGIS

On Google Satellite Imagery, I've created a layer with objects marking houses in a 1 km proximity to large streets in a rural setting using QGIS with the Openlayers Plugin. I would like to identify ...
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Finding output values of point density calculation?

I ran the point density tool and got an output, but because the 'Area Units' option in the Point Density was locked to Square_Map_Units - I don't know how to tell what units the density was calculated ...
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1 answer
582 views

OpenLayers - Dot Density map

I'm trying to create a dot-density map with OpenLayers (OL) and GeoServer. I've a counties shapefile and I'm creating a vector layer in OL with county shapefile set as source for the vector layer. I ...
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6 votes
2 answers
1k views

Density map of pedestrian paths and footways in QGIS

I need to identify public places within pedestrian areas in London, so I need to calculate the density of both pedestrian links and footways. I have classified my data according to the categorization ...
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1 answer
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Creating species richness map (as next stage after species distribution)?

I'm using ArcMap. I've read the messages related to this topic but they don't take me far enough. Most of the advice is related to species distribution, but I need to create a species richness map. ...
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4 votes
2 answers
274 views

Uncertainty of a line between two coordinates with uncertainties in QGIS

I am trying to plot the uncertainty of a line between two coordinates with uncertainties. I have created polygons around 2 coordinates to represent the uncertainty region around each point. I then ...
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