Questions tagged [heat-map]

For questions about heat maps, where a heat map is a graphical representation of geographic data, generally in the form of a coloured raster. Heat maps are used to highlight regions of higher than average data density.

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13 views

Which analysis to use? Analysing points' likeness across multiple fields including proximity. (AHP?)

I don't have much of a background in coding. I have a point layer with 400 points. The attribute table contains 3 fields of interest: Bearing (values between 0-180); a Ratio (ratio of ellipse long/...
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2answers
71 views

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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28 views

Does qgis2web plugin support heatmap symbology for a point layer?

I am trying to create a web page from QGIS using qgis2web plugin. I have a point layer and when I render its symbology as single symbol, it gets successfully exported to a web page when I used leaflet....
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43 views

How to make a heat map based on Grid layer in QGIS

The way this image is displayed is very clear, it shows the correlation of two (or more) attributes in space. This picture should be drawn in Arcgis, it should be a combination of grid layer, polygon ...
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55 views

Interpolating 0-1 (presence / absence) point data in a vector using QGIS "3.20"

I would like to make a heatmap using presence absence data (imported as a CSV file) for koalas but I can't work out how to do it. Here is the raw data (presence ) map This is the kind of map I ...
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1answer
37 views

Heatmap based on numeric attributes, not on density for line representation using QGIS

I have a number of points on a map, each with a numeric attribute taking values from 1-9. The points with attribute equal 1 should have the highest density representation, and the points with ...
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1answer
66 views

Making heatmap points full opacity regardless of weight using OpenLayers

As shown in this example, when the blur is set to 0, the opacity of each point correlates to the weight, and the opacity parameter is layered on top of the weight opacity. Here is an example image of ...
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1answer
35 views

OpenLayers: Change point colour to indicate number of overlapping points

I would like to have a heatmap that represents the number of overlapping points, basically to achieve the exact same thing as in this post, but in OpenLayers. At the moment I'm using opacity as an ...
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71 views

Heatmap with Contour Polygons

I have point data off the coast of Oahu. Someone else used these same data to create two polygons (approximated by me in the figure below with the green and red hand-drawn boundary lines). I believe ...
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49 views

Combining GPX tracks in QGIS

I have several GPX tracks on the same road and I would like to average out a heatmap of velocities from these GPX tracks on this road. I think I figured out a way to do this in QGIS - in theory. I ...
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1answer
56 views

Is there a function in PyQGIS (QGIS 3.10) similar to the ''slice" function in ArcPy?

I am working on a script that automatically generates heatmaps from point data. I am aware of the heatmap/KDE tool already existing in PyQGIS (I am working in QGIS 3.10). What I want to do after ...
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1answer
587 views

Using geometry points to get data in order to plot heatmap?

Excuse me if the title is confusing, English is not my main language, I'll try to explain myself as best as possible, also, I'm not great graphing, I'm learning. My code plots points on a shapefile ...
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28 views

Coloring heat map, with custom characteristics

I need to color a "heat map", with these characteristics: "Pseudocolor monoband", "Discrete" and with two levels: <= "STATISTICS_MEAN" -> Color 255/255/...
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20 views

What do the quantitative values for the colour ramp gradient for heatmap style in the layer properties for QGIS signify?

I would like to understand whether any quantitative values can be extracted when using the heatmap style in the layer properties? I assume areas with colours related to 1 are areas which have the ...
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1answer
40 views

QGIS Heatmap not available?

I'm using QGIS Version 3.16.4. I thought one can do heatmaps by going to the properties of a layer and selecting it under symbolization. But as you can see, it's not available in the dropdown menu. ...
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64 views

Automatically adding increasing transparency values to gradient stops in QGIS

I have a point layer in QGIS 3.14 on which I applied a heatmap symbology based on an intensity attribute (here a price value): But the heatmap colors extends all over the basemap layer, covering it ...
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30 views

Adding a well discernible symbol on top of a heat map in QGIS without duplicating a point layer

I have a point layer in QGIS 3.14 on which I applied a heat map symbology: I would like to add a well defined / discernible shape (circles here) on top of the heatmap for the underlying points to ...
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1answer
62 views

Assigning a weight to thousands of values in the attribute table to then make a heat map in QGIS 3.10

I am working with some data that has about 19,000 values. This data has been imported as a text delimited file layer, as it is GPS (long and lat) point value data, that has an associated metadata or ...
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1answer
67 views

How to create a heatmap from overlapping polygons using ArcGIS Server JavaScript API?

Using the ArcGIS Server JavaScript API version 4.18, how can I visually highlight areas with high concentrations of overlapping polygons, such as these historical cyclone tracks? In addition I need ...
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22 views

Problem with Python code to visualize a map in the geospatial analysis

You can download relevant files to execute my python code as below: https://drive.google.com/drive/folders/1WmkZ9t3RnAsd4Dy83TRdjWIsAdby4IwI I want to visualize data at the postal code level with ...
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1answer
46 views

Heat Map using a Date Range in QGIS 3.16.3 [closed]

I'm new to QGIS and I'm trying to make a Heat map with roughly 2000 data points using a date range. What I'm wanting is for the newer date to be the "hot" portion of my map. I've tried to ...
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49 views

How to integrate and plot both heatmap and quivers/arrows for different timestamps using folium?

I want to plot wind velocity heatmap and wind direction quivers together for different timestamps on top of a map using folium. I could not find any plugin for this integrated operation. Can you ...
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1answer
499 views

Why won't ggplot fill heat map using geom_tile in R?

I am trying to emulate some geom_tile plots I saw in a research paper. The plots were created with simulated data. Below I created a dataframe of "dummy data" using a subset of the actual ...
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2answers
94 views

How to make a Heat Map of Distance between a set of parallel lines in QGIS?

How to make a Heat Map of Distance between a set of parallel lines in QGIS? This question is an extension of Question posted on the following link: Distance between multiple parallel lines? I have a ...
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54 views

How do I combine heatmaps in QGIS?

I'm trying to create a view of two heatmaps in the same time with QGIS. I tried following the suggestion on this thread: Can I combine two heat-maps in QGIS? But it didn't work. The virtual layer ...
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71 views

Why is heatmap turning red in QGIS

I'm using QGIS 3.16.1. I'm creating a heatmap using the symbology. At first it appears like a normal heatmap, but it is still rendering. When it finishes the whole heatmap turns red. Here's a ...
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1answer
313 views

What causes the "could not create destination layer" error when creating a heatmap?

I'm using QGIS 3.16.1. When I try to make a heatmap I got an error message saying "Could not create destination layer." I then tried using a smaller row and column size, and it runs the ...
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1answer
80 views

Why is my heatmap not projecting?

I have been having a lot of issues trying to do a heatmap. At first the data would disappear when I created it, so I figured out that I had to reproject the CRS. I reprojected it, ran the heatmap, ...
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1answer
49 views

Why does my heatmap only give "degrees" as an option?

I'm trying to create a heatmap of a layer. I'm not sure what I should set the radius at, but it only gives me "degrees" as an option, instead of meters, feet, or other distance units. I ...
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59 views

Displaying Image Overlay in ArcGIS Runtime

TLDR; is there any way to display an image on a ArcGIS Runtime SceneView just like ImageOverlay, but without the use of ImageOverlay? (Long story in quotes) I have an ArcGIS Runtime application ...
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1answer
243 views

Create a heatmap with R for printed media

I am looking for a way to represent density points using heatmaps in R for printed media (e.g. using Rmarkdown to generate a PDF). The map should have a basemap (OpenStreetMap or Stammen) and instead ...
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1answer
77 views

PyQGIS CRS projection issue when converting shapefile to heatmap

I am trying to create a Python script that runs in the QGIS Python Console and uses the QGS API to create KDE heatmaps from shapefiles. The shapefiles can come in any number of CRS's but the heatmaps ...
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1answer
56 views

Kernel density estimation for frequency data on polygon level

I would like to make kernel density estimations for a variety of influencing factors on crime, but I do only have frequency data on polygon level, e.g. number of drug markets on county level. For all ...
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1answer
66 views

Influence of heatmap on point data

I´ve got a quite specific question and hope someone understand what I want. I´ve got two datasets (point-shapes): Camera traps which gained data of roe deer on forest meadows Camera traps which ...
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1answer
35 views

Creating heat map based on attribute from another layer in QGIS

I have a layer showing different trails in a nature areal. For each trail, there is an attribute with the usage of the trail (no. of people passing a trail counter). I now want to create a new layer ...
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194 views

Having trouble with the Heatmap's (Kernel Density Estimation-KDE) interpretation in QGIS 3.10

i wanted to generate a density/concentration map of a parameter, in this case Carbon percentage in a water sample. The dataset in csv file looks like these : So, I imported the csv file then plotted ...
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2answers
153 views

How to join values from a R dataset to a shapefile of polygons I've created in QGIS?

I have a dataset where I have count data of sea turtles associated to different areas, for example in area 4 the divers saw 20 turtles. I want to display the column of counts on a shapefile I've ...
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1answer
114 views

ArcGIS JS API - time series with heatmap

I am trying to create a time series of covid data moving across the globe. For now, I'm trying to use a heatmap to do it. Using this COVID19_Time_Series_Combined (which pulls data from here), I ...
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1answer
146 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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1answer
42 views

Create an 'heatmap' based off of a numeric attribute in a point feature class [closed]

I have a shapefile with several points, each of which has a numeric attribute 'price'. I am trying to find areas that have the most potential revenue concentrated based off of the price in the feature ...
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72 views

Plotting heatmap on QGIS using external CSV values rather than density of lat/long points

I'm trying to plot a heatmap in QGIS. The lat/long coordinates I have are arranged into 4 parallel lines (4 survey transects), with a third column in the CSV file comprising a value ranging from 1 to ...
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149 views

Dynamically-generated heatmap WMS tiles on GeoServer/Leaflet displays wrong [duplicate]

I am using a GeoServer to calculate dynamically a heatmap on points coming from a postgresdatabase with the SLD style presented there : https://docs.geoserver.org/stable/en/user/styling/sld/extensions/...
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2answers
219 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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0answers
59 views

How to group many points in the same point and colour it by value?

I have coordinates of car incidents and I have to draw a map. The coordinates are not precise: as you can see in the image below you can see the coordinates of 10 incidents and the crossroards where ...
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280 views

Adding values to heatmap in Leaflet?

I followed this methode https://geomappando.com/2016/11/08/come-realizzare-una-heatmap-con-leafletjs/ to get a heatmap from my GeoJSON file. But, I got it without having the value field included. ...
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1answer
34 views

Reading heat map at point in QGIS [closed]

I have created a set of heatmaps based on the amount of certain chemicals released at specific sites in an area using the QGIS heatmap plugin. I now have a CSV of patient locations that I have ...
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1answer
166 views

Creating heatmap from field/column in attribute table of shapefile in QGIS

I'm almost completely new to QGIS. I have a layer from a shapefile loaded up into QGIS with a few thousand zones/features. There are also multiple fields/columns in the attribute table. I need to ...
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0answers
70 views

LineString Heatmap with Open Layers 3

I need to make a heatmap with a bunch of linestrings using AngularJS and Open Layers 3. I didn't find any examples, just a question answered here but that don't worked for me. In the question he do a ...
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1answer
520 views

Heatmap based on values of points

I have these points on Energy performance and I want to create a heatmap in QGIS following the same logic in the colour scheme. I would like to create a heatmap ideally a vector or raster based on ...
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1answer
122 views

Altitude point layer to slope heatmap in QGIS

I have a vector point layer (grid of 100km x 50km, a point every 20meters = 12.500.000 points). It has an altitude attribute. I would like to have the information about the slope. I guess I need to ...

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