All Questions
Tagged with visualisation symbology
41 questions
5
votes
1
answer
181
views
Rendering polygon by two variables in QGIS
I have a set of polygons with two variables "variable 1" which can take values A, B, C, D, and E and "variable 2" which can take values V, W, X, Y and Z.
I would want to render the ...
- 231
3
votes
1
answer
95
views
Displaying two attributes of line vector layer with same color ramp in QGIS
I have a QGIS line vector layer that contains two attributes: "attr1", "attr2".
I want to display it as shown below. The same line geometry two times with an offset in both ...
- 645
8
votes
1
answer
328
views
Applying pattern only into strip inside polygon border in QGIS
I need to reproduce the style of a raster layer on a polygon layer like this:
where you see in red the hatching inside the red contour of the polygon.
I tried hatched line in the symbology, but I ...
- 1,313
2
votes
1
answer
338
views
QGIS: Combine stripes of different colors on polygons
I want to create a map that shows in which country which companies (offering the same product) are active. The style of the map should be similar to this one (source):
So, if company A is red, ...
- 21
6
votes
2
answers
273
views
Representing five categories of data in one symbol using QGIS
I have been given the big task of representing a lot of data in one symbol. The plan is to represent 5 categories of data in one symbol.
I hope to do this by changing factors such as:
Fill colour
...
- 63
2
votes
2
answers
2k
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 ...
- 567
6
votes
1
answer
211
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).
...
- 33.9k
3
votes
1
answer
1k
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
324
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....
- 19
3
votes
2
answers
805
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 ...
- 533
1
vote
0
answers
48
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
1
vote
0
answers
162
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 ...
- 246
8
votes
3
answers
476
views
Visualizing polyline with decreasing opacity towards its ends in QGIS
For a mapping project I am looking for a method how to visualize a polyline where the ends increase in opacity such that it will look like its fades away using QGIS 3.10.10. See the red circle in the ...
- 1,156
3
votes
2
answers
688
views
How to display image from SQLite database at each point? (QGIS)
How do I display images at specific points, through the raster image marker symbology, from a standalone BLOB attribute table (SQLite) loaded into QGIS?
To briefly summarise: I have loaded a SQLite ...
7
votes
1
answer
9k
views
Rule-based symbology in QGIS
I'm trying to create the following rule based expression for displaying a line:
if column "riparian Veg" has a 'Yes' entered into it then display the line but if another column titled "...
- 395
2
votes
0
answers
553
views
Creating wavy line in QGIS [duplicate]
I'm looking for a way to quickly transform simple lines into wavy, zigzag lines and so on in QGIS. I already tried to use the method reported by @christoph in a question posted in this forum (Drawing ...
- 648
2
votes
1
answer
2k
views
Creating proportional circles in QGIS 3.4
I am working with the polygon features and I would like the values to be represented in terms of proportional symbols (points). Values range from 0 to 30.
I would like that: zero value = no circle; ...
- 533
4
votes
1
answer
405
views
Symbolizing Isochrones in QGIS
I have generated isochrones for London based on my parameters.
However, the isochrones by definition are overlapping polygons.
I would like to show the different polygons of the isochrones using ...
- 787
1
vote
0
answers
282
views
Create New Custom Symbology with QGIS
I am using QGIS for GIS maps, and data visualization. There are very few symbols available for marker, line and polygons. I want to create my own symbols, that i can later import into QGIS and then ...
- 2,281
12
votes
1
answer
935
views
Point cluster symbology for different categories without overlapping symbols
I'm trying to visualize crimes based on if the crime happened during the day or night time. I've tried using the point displacement tool but I'm not satisfied with the results because the readability ...
- 637
6
votes
2
answers
6k
views
Prevent symbols from overlapping in QGIS
I have multiple points layers that I want to represent in a map. Because of the reality of the field and some errors of mapping, some layers are overlaying so the printed map is not good and not ...
- 909
3
votes
1
answer
518
views
How to put an SVG symbol in my rules-based symbology?
I have added a points layer in which I have to put different SVG icons, according to the column level.
So far so good, the separation is according to the level using a default symbol, but I want to ...
- 157
2
votes
1
answer
151
views
Making several SVG icons using one layer in QGIS?
I need to make several different SVG icons in the same size.
I am using a list with numbered SVG from 1 to 262:
The obvious way is to make a different layer for each SVG.
I have tried to change the ...
- 2,867
3
votes
1
answer
86
views
How can I stack/pile point layers within administrative areas with qgis
How can I stack/pile point layers within administrative areas with QGIS. Close points (categorized) should not overlap in zoomed out map (and lose their position).
Please see the visualization of ...
- 31
31
votes
4
answers
6k
views
Drawing wavy/wiggly lines in QGIS
Is there a QGIS function or plugin to draw wiggly line?
I have used "Spline Tool" to manually draw some waves, but it is time consuming.
If possible, I would like to draw something like:
...
- 31.2k
8
votes
2
answers
19k
views
Changing marker shape based on a rule or column value in QGIS?
I am using QGIS 2.14.14. I am styling point markers in a layer that I imported using "Add Delimited Text Layer". I want to style the markers based on three properties:
Color of marker relates to ...
3
votes
1
answer
92
views
Using categorized and graduated visualizations with narrow table
I'm working with county data in a narrow table format with a WKT column. To simplify, if the headers are id, geo_level, metric, metric_unit, and metric_value, some entries for the county with id 5 are:...
- 145
3
votes
1
answer
857
views
How to create a symbol with arrows and an arc in QGIS
I'm using QGIS 2.18 and wondering if there's a fairly simple way to create a symbol with an arrow on the end of a ray, and an arc in between.
The thing that makes it complex is that the angle is not ...
- 483
16
votes
2
answers
5k
views
Shifting display of overlapping lines in QGIS?
When points are overlapping, there is this property which allow to automatically display the lot of them separately around where they are, called 'Point displacement'. But it doesn't work for lines, ...
- 1,211
7
votes
2
answers
1k
views
Rendering point symbols on top of diagrams?
I've got some data where I have categorized symbology for point data with different colors showing different categories. I would also like to display some data using the pie charts function. I would ...
13
votes
4
answers
4k
views
Showing antenna symbols on the map: point symbols or features (polygons)
I want to show a cellular network on a map.
Input data is a .csv file where each string is a cellular sector.
The attributes are: sector id, its coordinates, its azimuth and an angle of antenna beam ...
- 337
2
votes
0
answers
193
views
Creating AutoCAD-like grading lines in ArcMap? [closed]
I often need to show grading for roads and ditches. This is what the map readers require and what the standard symbology for grading is. These 3D lines can be easily created in AutoCAD civil 3d and ...
- 20.4k
3
votes
3
answers
1k
views
Displaying symbol to specific attibute in QGIS
I have a point shapefile, where I categorized my waypoints with attributes (schools, toilets, etc.) and I would like to display certain attributes with specific symbols.
How can this be done?
- 31
8
votes
3
answers
3k
views
Should I use a discrete or continuous scale for coloring a chloropleth?
I am making a choropleth for an upcoming local race using D3. There are two candidates running for an election. For any given polygon on my map, if the red candidate has more votes, the color should ...
- 641
1
vote
0
answers
43
views
QGIS rule-based point style responding to number of co-located objects? [duplicate]
I am mapping the geolocated location information for 5.5k Twitter profiles as point data. Many of them have the same location ie "London, UK" meaning that they return identical coordinates. On the map ...
- 11
14
votes
3
answers
883
views
Is it possible to use symbols instead of colours to visualise raster cell values?
I have a raster image (GeoTIFF) with integer values. I know how to visualise raster values in QGIS using colormaps or similar, but I would like to assign symbols to each colour value instead - just ...
- 4,520
8
votes
3
answers
4k
views
How to present three spatial variables in one map? [closed]
I want to assign 3 category of variables in a single map.
In other words, I have to produce a cartographic visualization of the damage including a legend listing:
damaged surface area in the ...
7
votes
3
answers
6k
views
How to normalize choropleth maps of census information?
I'm trying to improve on the census-based maps on this site, which shows census values at 5 scales from Collection Districts through to State.
Currently the maps show whole numbers (eg total ...
- 21.2k
10
votes
7
answers
1k
views
What is the point of standard symbology?
There are several questions on the site asking for standard symbology to represent markers of specific types of objects (i.e. Power Distribution, Crime Mapping, Emergency Symbols, Lakes).
What is the ...
- 4,254
43
votes
5
answers
14k
views
Curved point-to-point "route maps" [closed]
I have recently been looking at airlines web pages that display their routes departing a certain city to all other cities they service. I would like to be able to create similar curved routes between ...
- 23.2k
28
votes
5
answers
6k
views
Are there any international standards for map symbology?
We are going to let our users add points, polylines and polygons to a map. Are there any international standards for map symbology?
For example for emergency symbols?
- 4,212