Questions tagged [visualisation]
The representation of data in a viewable medium or format
393
questions
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+50
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(
...
- 1,907
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) ...
- 23
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
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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(...
- 33
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 ...
- 71
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 ...
- 161
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 ...
- 161
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 ...
- 25
1
vote
0
answers
40
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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)...
- 41
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 ...
- 29
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0
answers
43
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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"},
}...
- 325
0
votes
0
answers
27
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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 ...
- 509
1
vote
0
answers
45
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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.
...
- 21
0
votes
1
answer
59
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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....
- 149
1
vote
1
answer
118
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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 ...
- 11
0
votes
1
answer
42
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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
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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 ...
- 307
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 ...
- 565
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).
...
- 27.3k
0
votes
0
answers
204
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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....
- 101
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 ...
- 21
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 ...
- 111
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 ...
- 43
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 ...
- 83
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, ...
- 1
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 ...
- 143
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 ...
- 161
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("...
- 59
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 ...
- 141
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 ...
- 113
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 ...
- 2,204
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 ...
- 187
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 ...
- 1,402
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 ...
- 21
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 ...
- 147
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 ...
- 796
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 ...
- 107
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 ...
- 29
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 ...
- 123
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 ...
- 337
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 ...
- 41
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 ...
