Questions tagged [visualisation]
The representation of data in a viewable medium or format
383
questions
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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
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0
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25
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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 ...
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0
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24
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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.
...
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22
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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....
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1
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1
answer
60
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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 ...
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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(&...
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votes
1
answer
18
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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 ...
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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/...
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1
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105
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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 ...
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2
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125
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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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votes
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109
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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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101
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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....
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2
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2
answers
354
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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
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0
answers
40
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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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answer
84
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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 ...
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4
votes
1
answer
155
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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
answers
39
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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
0
answers
20
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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0
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57
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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
159
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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
121
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
194
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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 ...
0
votes
1
answer
31
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("...
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answers
119
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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 ...
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7
votes
1
answer
197
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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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2
votes
1
answer
179
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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 ...
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1
answer
69
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
126
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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 ...
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4
votes
3
answers
192
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
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1
answer
100
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 ...
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1
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2
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341
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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
98
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
362
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 ...
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votes
1
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63
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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0
answers
33
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
122
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 ...
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4
votes
1
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256
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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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votes
3
answers
127
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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 ...
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1
vote
2
answers
38
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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 ...
0
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0
answers
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Adding 2D information to a 3D dataset in ArcGIS Pro
I am working in a local scene (ArcGIS Pro) whereby I have a 3D dataset that shows buildings within a city. This dataset has no further information (i.e. no attribute table) and all the 3D buildings ...
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When visualizing WorldView and Ikonos imagery in Google Earth Engine, my images appear to have a blue tint. How do I display them in true color?
I'm using GEE to visualize WorldView and Ikonos imagery. If I just use the bands for image visualization as seen below, the image appears very dark:
var vizWV = {
bands: ['b5', 'b3', 'b2'],
};
I ...
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0
answers
44
views
Pyferret axes lines thickness
Is there a way to set thickness of specific axes in ferret? With the default pen the lower axis is thin or invisible if I output image as png. I've tried setting PPL PEN 0, 7, which makes this lower ...
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368
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Remove default OpenStreetMap tile layer in Leaflet - Folium?
I have multiple maps in my Folium map (map1 and map2) however, I see OpenStreetMap as the default option. I want to remove the OSM option altogether and keep just my two custom layers. If I set tiles ...
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2
votes
1
answer
220
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Rendering three-composition raster map with ternary colormap using R
Say there are three raster maps, representing percentages of sand, silt and clay respectively. The three values for each cell are hence summed up to 1. I want to use one raster map to characterize the ...
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2
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91
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QGIS - Visualize GML with CSV metadata
I have a file with 3D building information (GML file with building id and coordinates).
Also, I have a CSV file with the same building IDs, coordinates (X-Y and Longitude Latitude), and additional ...
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6
votes
1
answer
252
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Permanently viewing vertex of polygons in QGIS
I work with shapefiles in QGIS 3.20. I have many polygons and I need to see their vertices. How do I show the vertices on the polygons?
I have gaps between polygons shown by the topology checker. I ...
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95
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Visualising ground radar in QGIS using rendering
I have GPRI intensity ground based radar data as data validation for my SAR analysis.
As this does not appear to be a multi-band image, how do I render this on QGIS so I can see my targets?
I have ...
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0
answers
156
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3D visualization of geological data in QGIS
I'm checking the possiblities of 3D visualization in QGIS for geological data. At the moment I am trying to visualize the surface raster and the sub-surface rasters together in a 3D View.
It should ...
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72
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Copy Raster changes max and min values of the newly created raster band in ArcGIS Pro?
I am using ArcGIS Pro 2.8 and I imported a NetCDF file. Please find the NetCDF file attached. I imported it with multiple dimensions and multiple variables using the "Add Multidimensional Raster ...
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1
answer
216
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Aggregate polylines in JavaScript (Leaflet)
After executing a certain amount of routing calculations, I have a list of vehicle routes as shown in the image below. Now I have added an opacity to these lines to visualize the frequency of certain ...
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