Questions tagged [visualisation]

The representation of data in a viewable medium or format

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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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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
77 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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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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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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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 ...
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5 votes
1 answer
80 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 ...
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3 votes
2 answers
89 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
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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 ...
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0 votes
1 answer
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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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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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6 votes
1 answer
78 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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2 votes
1 answer
51 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 ...
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1 vote
1 answer
49 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
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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
146 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
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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 vote
2 answers
170 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
52 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
278 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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1 answer
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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
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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
81 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 answer
181 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
99 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 ...
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1 vote
2 answers
37 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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20 views

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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56 views

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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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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1 vote
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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
118 views

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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1 vote
2 answers
73 views

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
154 views

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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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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158 views

Google Earth Engine Exporting Image from Collection without taking median

I am new to Google Earth Engine and satellite imagery in general. My goal is to export bands B1-B7 from the [Landsat 8 image collection][2] over a given geometry and be able to visualize each band (or ...
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16 views

Visualizing Bellingcat's study on Covid related Tweets in India

Some weeks ago I came across a very interesting article using state of the art geospatial techniques and visualization to study Covid-related Tweets in India. This is the post. https://www.bellingcat....
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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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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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  • 315
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1 answer
172 views

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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  • 103
13 votes
4 answers
738 views

Showing the bounding box for every coordinate system in QGIS

I'd like to visualize where every coordinate system in QGIS is in the world. I can see the bounding box for them when I go to QGIS and select coordinate system: But I'm trying to figure out how to ...
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4 votes
1 answer
56 views

How can I make overlapping features in ArcMap transparent?

TLDR: What I want is best explained by the pictures below. In words: I have partially overlapping features and I want to visualize this overlap with transparency. I know I can set a Layer Properties &...
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118 views

Overlay thumbnail/gif on topographical map in Google Earth Engine

I am working with Google Earth engine and the MODIS dataset to create visualizations of sea surface temperature data. I can visualize the data on the map in the online code editor, and I can export an ...
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1 vote
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Using rasterio and matplotlib to visualize Sentinel-1 data

I'm trying to work with satellite data for the first time and running into problems. I find the documentation about using Sentinel-1 data in Python lacking, but maybe I'm searching for the wrong ...
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95 views

Importing symbology for layer from ArcMap to ArcGIS Pro

I have assigned a symbology to layer in ArcMap and saved the layer as a layer file so that when I open it in ArcGIS Pro, I can visualize using the same symbology but ArcGIS Pro assigns it some random ...
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0 answers
29 views

Fixing advanced labeling for a layer in ArcGIS Pro 2.6

I opened a NetCDF file in ArcGIS Pro using Multidimensional raster layer under add data. Then I assigned some symbology to the layer using the advanced symbology option within the symbology pane. ...
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  • 315
2 votes
1 answer
38 views

Using a grid code to visualize habitat values

I am working on wildlife and agriculture data in a region where I am attempting to layer the different types of habitat to show the total value of a parcel. For example, I have layers for endangered ...
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1 vote
0 answers
63 views

QGIS Legend for multi-band Raster

Is there a simple way to generate labels for a multiband Raster in QGIS like it is implemented as Default in ArcGIS? I want to write a Variable Name of each Band in the legend ArcGIS example:
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  • 153
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66 views

How to visualize layers from ArcGIS\QGIS project in their order

A lot of times I've seen visualization of layer in their order (like on the pic). Could anyone recommend a tool to make the same with my layers (could be QGIS or ArcGIS) or at least how this ...
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0 votes
1 answer
46 views

Drawing "walls" in ArcScene

I am working on a 3D visualisation of a map displaying the population density. I'd like to visualize the density by setting the height of an area according to it's population density. Whenever I set ...
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1 vote
0 answers
53 views

Filter symbols in QGIS similar to labels for anti-collision?

I am using the GeoNames data in a PostGIS 2.5 table to populate cities on a map in QGIS, but with millions of entries it is very crowded with overapping making it useless without some sort of ...
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