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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3
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1answer
50 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 ...
2
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1answer
42 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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0answers
24 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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0answers
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 ...
0
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1answer
25 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. ...
3
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0answers
42 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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0answers
29 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
47 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
51 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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0answers
17 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 ...
0
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1answer
39 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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0answers
23 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 ...
2
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1answer
174 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 ...
2
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2answers
56 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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0answers
38 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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0answers
62 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
196 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 ...
0
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1answer
64 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
47 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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0answers
43 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 ...
1
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1answer
105 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
43 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 ...
0
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1answer
31 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 ...
2
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1answer
57 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
30 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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0answers
19 views

How could I create a heatmap with carto.js 4.2.X, is it possible?

I am trying to create a heatmap with the latest version of carto.js and gmaps, but I have not succeeded. I don't know if it is possible with this new version. With cartoDB.js it was simpler, because ...
2
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0answers
108 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
69 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 ...
0
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1answer
82 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 ...
2
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1answer
107 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
36 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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0answers
63 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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0answers
110 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/...
6
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2answers
194 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 ...
1
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0answers
57 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 ...
0
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0answers
222 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. ...
0
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1answer
24 views

How to read a heat map at a point in QGIS?

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 ...
0
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1answer
95 views

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

I'm almost completely new to QGIS, so help would be greatly appreciated :). I have a layer from a shapefile loaded up into QGIS with a few thousand zones/features. There are also multiple fields/...
0
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0answers
53 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 ...
1
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1answer
366 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 ...
1
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1answer
96 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 ...
2
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0answers
25 views

Randomly filtering points in unevenly distributed point dataset?

I have a vegetation plots dataset which has unduly high concentrations of plots in certain parts of the dataset. I want to even out the concentrations of points so that there is a more even ...
3
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2answers
505 views

Clip boundaries of heatmap according to another feature

Here is a heatmap in Leaflet (using heatmap.js and leaflet-heatmap.js) with hot spots that extend beyond the basemap boundaries: How would someone clip this? In QGIS or ArcMap you would follow a ...
1
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1answer
221 views

How can I make a heatmap of polygons using a graduated color scheme in QGIS?

I want to make a heat map of species biodiversity like the people did in the picture below. I can sort of get it to work by setting my layer with multiple polygon subclasses in the Layer styling panel ...
1
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1answer
60 views

Interpret a kernel density map for pollutants

I currently have a grid of values (concentration in ug/m^3) for a certain pollutant. I then converted each grid to a point to use as an input to the Kernel density analysis tool in ArcGIS pro. The ...
1
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1answer
218 views

Inserting only one band in Google Earth Engine and modify that band

I am trying to see the heat inside Laos watershed and I would like to only use Band 10 in Landsat image. But the watershed is located within the intersection of four different Landsat images. So if I ...
1
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0answers
196 views

Animating a heatmap over time using Google Maps API

I'm currently building a web application using flask and google maps api. I was wondering if it would be possible to create a page where user can select the time using a slider bar and the google ...
1
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1answer
612 views

Interactively Display Values of a Heatmap.js leaflet.js Heatmap Layer

In this example of the heatmap.js tool, I see how the values of the heatmap is returned by using heatmapINstance.getValueAt(): demoWrapper.onmousemove = function(ev) { var x = ev.layerX; var y =...
4
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2answers
149 views

Visualizing signal strength by location

I have a dataset which contains location and signal strength data from a field survey for a radio project I'm working on. An example: lat, lon, signal 34.123, -89.123, 55 34.124, -89.124,...
4
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1answer
167 views

Postgis/Postgresql - Interpolate equadistant points based on weighted attribution similar to QGIS Interpolation(Heatmap Kernal Density Estimation)

I have equadistant vector points, that are all 400m apart but only cover certain areas of a map that have a value of (1-5). In QGIS I can run the Kernel Density Estimation with my vector points to ...

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