Geographic Information Systems

Questions tagged [density]

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

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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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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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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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15 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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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 ...
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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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3answers
557 views

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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2answers
101 views

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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1answer
21 views

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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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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273 views

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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2answers
573 views

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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1answer
95 views

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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1k views

How to reduce points by proximity

I got a layer with over 4 million points. The distance between the points are 1 meter. How can i reduce the data so that no points have less than e.g. 10 meters between them?
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345 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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1answer
82 views

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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3answers
1k views

Creating population dot density map at the block group level in QGIS

I'm new to QGIS, always used ArcMap, and I'm struggling to find out how to best display population density at the block group level for a county (the most granular level of detail for census geography)...
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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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4k views

Doing heatmap from line data in QGIS?

I want to perform a line density analysis for my line data, based on an attribute. The heatmap option (kernel density analysis) seems to be only possible for point data. I have tried to convert my ...
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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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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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1answer
61 views

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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1answer
174 views

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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1answer
169 views

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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2answers
170 views

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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799 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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3k views

Calculating Line Density in QGIS?

I have a map of fracture distributions over an area and I would like to calculate the density distribution of fractures that intersect a moving window with a specified radius. Is there a way to ...
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1answer
83 views

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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1answer
49 views

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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1answer
338 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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2answers
524 views

Trying to measure point density along a line

I have a dataset that consists of animal sightings along a road and I want to calculate the density of points (sightings) along that road. My primary goal is to measure sighting hot spots, but I also ...
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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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1answer
756 views

Percent coverage of a polygon in a raster grid

I have a wooded area polygon and a study area grid of cells with 300m resolution. I would like to calculate a raster which shows the amount of each grid cell covered by the polygon. The density per ...
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1answer
1k views

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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2answers
162 views

Calculating city density in GIS [closed]

There's a city called http://map.vmr.gov.ua/ in which each house has a type (for living, offices etc) and number of floors. I want to find out city density - i.e. to assign certain amount of people ...
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2answers
628 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 ...
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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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2answers
665 views

Find average density value within a polygon in ArcMap

I've created a point density heat map for a city intended to show areas where there is more or less access to a certain type of public school. It would be useful to be able to identify which local ...
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0answers
92 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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6answers
6k views

Identifying true curves/arcs in ArcMap?

The only good way of creating circles in ArcMap is using true arc, (compound curves) but I need to convert those to vertex (densifying) because of a compatibility problem. I need info for geodatabase ...
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2answers
14k views

Creating density map from point data in ArcGIS Desktop?

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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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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2answers
1k views

Density analysis producing extreme values?

I have point data of gas flares and I am trying to create a simple density raster of those flares. Results are either 0 or in the 100,000-1,000,000 range (when there's 5 to 40 or so points in each box)...
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Summing Raster cells to equal circles with specific sum using ArcMap? [closed]

I have application user density data that I've collected. Each gps point has a user density associated with it (for example: 150 users within a 1 km radius, which calculates to users/[pi*R-sq] OR 47....
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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
4k views

How to make a density map from polygons/rasters (ArcGIS)

I would like to make a density map of grasslands. I have a vector layer of habitat classifications, I would like to a density map of grasslands within a specified radius. My thoughts are to: ...
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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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2answers
566 views

Calculating density map of cycleways using fishnet in ArcGIS Desktop?

How can I calculate density map of cycleways (line feature) which refers to net grid in ArcGIS? Result by using function Line Density in ArcGIS for me is not satisyfing. I created reference grid net ...
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3k views

What type of kernel density function does ArcMap use?

I know that there are several types of kernel density functions, such as uniform, cosine, Gaussian, etc. I was just wondering which one the "Kernel Density" functionality in ArcMap 10's Spatial ...

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