Questions tagged [visualisation]

The representation of data in a viewable medium or format

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QGIS visualization of Pleiades image is gray and fixed only when copying style

I have airbus Pleiades images which has 4 bands - B , G , R and NIR. The image was reprojected (4326) and resampled (50cm) using GEE as following: task = ee.batch.Export.image.toCloudStorage( ...
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2 votes
1 answer
27 views

How can I create a 3-dimensional cube legend (R)?

Has anyone ever plotted a 3-D (cube) legend as shown below? Essentially trivariate mapping. I would like to recreate the below using the same variables of population, built (% area that is built up) ...
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0 votes
0 answers
48 views

Making map with marginal graphics like rasterVis::levelplot(margin=T)

I love rasterVis::levelplot(margin=T) because its marginal graphics show the column (x) and row (y) summaries of the Raster object. I think it is very helpful to visualize the raster. Package ...
  • 151
0 votes
1 answer
23 views

Assigning colors to classes using conditional statements using GEE

I am trying to assign colors to each of the class by checking the conditions (condition on - pixel values). But it doesn't check the else statements, it only checks the if: if (image.gte(0.1).And(...
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0 votes
0 answers
19 views

Legend for gridded Holoviews visualization with categorical data

I'm using the holoviews extensions to visualize a gridded dataset with landcover classes. Plotting the data is straightforward with da.hvplot(). This results however in a continuous colormap with ...
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2 votes
1 answer
111 views

How to add circle around points?

For a point, how do you create circles that shows a certain distance from a point. For instance, I have the following point: What I want to have is this: For instance, while the black circle ...
4 votes
2 answers
99 views

Visualizations disappear when reopenning

Data is reloaded when I reopen the QGIS, however all of the visualizations disappear when I reopen the QGIS. I add the dataset as follows: Visualization looks as follows: When I reopen the QGIS, it ...
0 votes
0 answers
105 views

Folium Marker-Cluster map is not visualized for a large dataset

Im trying to create a Marker-Cluster map using folium for some data, I first tried with a sample dataset where the sample size is 1000 row points, which ran fine with no error. But when im trying to ...
1 vote
0 answers
40 views

Visualizing German ALKIS LoD2/cityGML data in 3D map view QGIS 3.22

I have a dataset containing all relevant information to build a 3D building (https://ldbv.bayern.de/produkte/3dprodukte/3d.html) with one layer containing roof information (incl. orientation and slope)...
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2 votes
1 answer
61 views

Showing full list of names of features within polygon when hovering over it in QGIS

In QGIS I've successfully joined three tables of data: 'Addresses', 'Persons', and 'Polygons'. The polygons represent the address on the map, and each address "contains" the names of all ...
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0 votes
0 answers
43 views

Is a viewshed reversible?

I want to understand what is visible by a human observer standing in a particular location. Therefore, I have conducted a visibility analysis in ArcGIS with a DEM, using an observer offset of 1.75m to ...
1 vote
2 answers
152 views

How to show points on LineString in QGIS?

I created a shape file with the following schema in python: schema = { "geometry": "LineString", "properties": {"id": "int"}, }...
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0 votes
0 answers
27 views

Visualisation with short calculation beforehand

I have nationwide lines. For each county (or state) I like to display the result of a small calculation with them. (length in county-30*points in county)*40 in a form similar to this nationwide ...
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1 vote
0 answers
45 views

Automate layout design on ArcGIS Pro

I have 100 different layouts, each zoomed to different polygons on the map. I would like to add two accompanying images, that are unique to each layout and positioned as shown in the screenshot below. ...
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0 votes
1 answer
59 views

Visualization of multiple classes based on one raster band with Google Earth Engine

I'm working with Google Earth Engine and I have a raster image with one band and pixel values between 0 and 2. I want to create three classes: class 1: pixel value = 0 class 2: pixel value = 0.01 - 0....
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1 vote
1 answer
118 views

Converting nested JSON flight data into shapefile or similar

I am creating a visualisation/map of typical flight patterns over Los Angeles, California. I am interested not in live data, or even particularly recent data; rather, I am hoping to find a data set ...
0 votes
1 answer
42 views

How to set number of columns with stack or brick or spatraster in rasterVis::levelplot?

If I have a spatraster with 6 layers, rasterVis::levelplot will give a 2 rows and 3 columns plot. How can I change it to 3 rows and 2columns? library(rasterVis) library(terra) f <- system.file(&...
  • 151
0 votes
1 answer
21 views

Creating 3D representation of line shapefile using ArcGIS

I have a line shapefile of links that build a network. Now I'd like to assign each node (or every end of a line segment) a z-value depending on a certain attribute. Is it possible to then display this ...
  • 327
0 votes
1 answer
29 views

ASTER DEM, Incoherence of slope analysis

I'm using a Aster tile DEM to perform some terrain analysis on an area in the French alps (original CRS:EPSG 4326-wgs 84), using QGIS 3.2. My projected coordinate reference system is EPSG:2154-RGF93/...
0 votes
1 answer
136 views

Sharing GIS data with non-GIS users [closed]

I want to visualize and share GIS data with non-GIS users within my organization. The data basis is European CO2 emissions from industrial sites from the E-PRTR, thus a point data layer that should be ...
1 vote
2 answers
370 views

Same symbology and color for all attributes of layer in QGIS

In QGIS 3.22.0 (Bialowieza) I have a polygon layer with different attributes. I'm making a categorized map for each attribute in my table. For that I'm duplicating and renaming my layer corresponding ...
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6 votes
1 answer
124 views

Representing difference between polygons only with Symbology in QGIS

In QGIS 3.22 I am trying to visually represent a difference between polygons after its change. In the end I want to know where the polygon was enlarged (#72ff85) and where it was degraded (#ff7272). ...
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0 votes
0 answers
204 views

How do I drop pins/markers for hundreds of points and display them on a map (OpenStreetMap)

How can I import a list of 100 locations (addresses stored in a line-delimited file) and display them all on a map? I have the names of 100 towns/cities across a country. I have no idea where they are....
2 votes
2 answers
1k views

Creating polygon mask in QGIS

In QGIS 3.22.5, is there possible to use polygons for the masking layer? I want to use numerous little polygons to mask lines (only layer which consists of lines). In ArcGIS that works just by ...
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1 vote
0 answers
48 views

Find min and max values of a field (column) in a feature layer

I am using ArcGIS API for Javascript in a Nuxt application and I would like to find the max and min values of a field in a feature layer hosted on ArcGIS. How to do that? Here is the code. The values ...
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2 votes
1 answer
134 views

How to reorder categorical raster legend order in R

For example, I have a landcover raster and I want to use terra::plot to make a map. library(terra) test <- rast('test.tif') plot(test) The order now is "3,4,6,8". Now I want to reorder ...
  • 151
4 votes
1 answer
250 views

Displaying only part of points in QGIS

I have a vector layer with ~30M points, which is why the layer is displayed for a very long time. And I'm not talking about further work with him yet. Is it possible in QGIS to display only a part of ...
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0 votes
0 answers
45 views

QGIS Handling Heatmap Data Range

I have a grid of hexagons with data (ranging between 0 and 1) and, using the centroids of the hexagons as a base, I would like to visualise the data as a heatmap. On the technical side, this works ...
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0 votes
1 answer
42 views

Qgis2threejs changing rotation point

I am new to QGis and have an issue with the QGis2threejs plugin. I am trying and searching already for some hours, but couldn't find an answer for this - I hope it's not something obvious. If yes, ...
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1 vote
0 answers
74 views

3D visualization for irregular boundaries shows an infinite height

I am new to GIS. I am trying to visualize a DEM with irregular boundaries. When I am trying to show it in 3d via 3D map or Qgis2threejs, the boundaries get an infinite height that I can no longer see ...
5 votes
1 answer
245 views

Adding space between repeated symbol for SVG fill in QGIS

I recently learned how to perform an SVG fill for polygons. The result fills like a brick fill without spaces: Is there a way to define a space between the repeated image from within QGIS (as opposed ...
3 votes
2 answers
154 views

Algorithm of automatic ee.Image visualization used by Map.addLayer

The following code: var image = ee.Image("MODIS/051/MCD12Q1/2001_01_01").select(["Land_Cover_Type_1"]) Map.addLayer(image, {}, '2'); gives an RGB visualization displayed on the ...
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3 votes
1 answer
301 views

Representing roads consisting of polylines as polygons in QGIS

I am working with some roads in London that I downloaded online. The roads are represented as lines like below: How can I transform each road from a line into a polygon in QGIS? So that the roads ...
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1 vote
1 answer
40 views

Visualizing GLDAS data using GGE

When I try to visualize any GLDAS data, it seems to be all black? I've tried adjusting visualization parameters with no success. Very short code snippet below: var Daily = ee.ImageCollection("...
0 votes
0 answers
154 views

D3.js globe view data visualization

I am using D3.js globe view as in the code penhttps://codepen.io/EleftheriaBatsou/pen/VQxdVY?editors=1000 India map that is in the globe view widget is not same as the one while verifying the globe in ...
7 votes
1 answer
302 views

Visualizing effectively transport transit lines in QGIS

I have a shapefile that contain bus lines. You can see a screenshot below: I would like to visualize the lines in a more understandable way since there are a lot of overlapping sections. I have tried ...
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3 votes
2 answers
306 views

Apply a random color on each feature of a featurecollection

I'm working in the JavaScript code editor and I would like to visualize features created from the reduceToVector function. The best way to visually assesses that the algorithm match my expectation ...
1 vote
1 answer
84 views

Categorising points layer using multiple values in QGIS

I've imported wildlife species sightings with individual sightings plotted. I now want to be able to display these sightings with more detail, firstly by assigning a shape to the "Class" (e....
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2 votes
1 answer
183 views

View vector GeoServer line layer in Leaflet

I have simple line layer created based on shapefiles. It can be viewed in GeoServer with OpenLayers preview: I also can be imported and correctly viewed in QGIS. I tried to visualize this layer over ...
4 votes
3 answers
232 views

Is it possible to do an "inverse/symmetrical difference fill" for polygons in QGIS, i.e. fill everything BUT the polygons?

I often deal with polygons that delineate an area of interest. When visualizing them, I have the problem that: using a fill "masks" the content of the area of interest, e.g. a background ...
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2 votes
1 answer
145 views

What do gradient stops' relative positions on colour ramp (%) signify when using QGIS heat map tool?

I'm using QGIS 3.18 heatmap tool to visualise the space use patterns of chimpanzees for my master's dissertation. I import each chimpanzees coordinates as a csv file and then change the layer's ...
1 vote
2 answers
491 views

Filter DEM image collection for elevation band value greater than 0, to show land only - Google Earth Engine

I'm trying to display only the land areas of a DEM image collection, by filtering the image collection for values greater than 0. I am not sure how to write the arguments properly. There is only 1 ...
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2 votes
2 answers
127 views

Dynamic Category thematic map

I am working in QGIS 3.8.3-Zanzibar on a shapefile with polygons. I am zoning by selecting the polygons and giving each group a different number (a zone code). In order to visualize it, I have a ...
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3 votes
2 answers
466 views

Improving readability of black and white map

I need to produce a map using grayscale (QGIS), as this figure will be printed in black and white. The map is made up of two layers: one cointains the polygon geometry (land cover) - there are five ...
  • 299
0 votes
1 answer
85 views

adjust visualization parameters as parametric values

i want to define visualization parameters for maps as codes in main coding space not as import record for this, i want to calculate the min and max values of image and set them in visualization ...
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1 vote
0 answers
36 views

Symbology on joined variables not showing up on map in QGIS

I am trying to add a certain styling to points I have on the map. I have set a Rule-based styling with a range added based on a different variable. Both variables were added to the point DB from a ...
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4 votes
1 answer
200 views

Using polygon fill effect to desaturate underlying base-map imagery in QGIS

In QGIS 3.12 I'm tying to use a draw effect with a polygon layer (that has an inverse fill) that will desaturate imagery underneath it, while keeping it's brightness the same. The objective is to have ...
4 votes
1 answer
326 views

Using data defined override for SVG-marker lines

After not getting enough detail on that part of my problem in this post, I am now trying in a separate question. I am unable to do data defined override with SVG markers on a line layer. I'm not sure ...
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3 votes
3 answers
157 views

Visualizing points with different colours based on field from polygon layer in QGIS

I am aiming to create a map showing species location records as points. I need to make the points different colours based on land type which is a polygon layer. So I want my species points to be a ...
1 vote
2 answers
42 views

Hiding pixel of one layer based on pixel value of other layer

I have a raster layer that contains multiple bands. I want to visualize one band in particular, but only the pixels that have a value of 0.6 or higher in another band of the same raster layer should ...

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