Questions tagged [cartography]
Using artistic and scientific principles for creating maps and graphically representing geographic areas
864 questions
1
vote
0
answers
23
views
What Projection String could be used for creating something similar to the Chinese Vertical Map?
I recently saw this Vertical Map made by a Chinese Cartographer.
I want to create a similar map in QGIS, and for that, I need the CRS string or the Projection String.
The only detailed information I ...
- 41.6k
1
vote
0
answers
33
views
Cartographic work in 4326 QGIS project
I am working on a project in QGIS whose CRS must be set to 4326. The problem is that when moving around the project map (without zoom in or out) the scale does not remain constant.
This is an ...
- 73
0
votes
0
answers
38
views
Classification based on two attributes in QGIS
I am using QGIS occasionally to illustrate landscape analyses, assessments and resources. Nothing too fancy at this stage.
I have been wondering how I can classify my map based on two attributes.
In ...
- 1
1
vote
1
answer
99
views
Making population density map in QGIS
I have a CSV file of Red Squirrel trail cam sightings. The file has multiple sightings for each trail cam location and includes date, time and location.
Using the Heatmap symbology gives me a good ...
- 451
3
votes
1
answer
99
views
Excluding some values from the quintile classification in QGIS
I am working in QGIS with a vector layer of about 8000 records and I would like to use the graduate symbology, equal count (quantile, 5 classes) with a variable that contains some records to which the ...
- 533
0
votes
0
answers
19
views
How to write an SLD to put the lower left corner of the external symbol on the points in GeoServer
I have a point layer in GeoServer and I used a simple SLD like this:
<sld:StyledLayerDescriptor xmlns="http://www.opengis.net/sld" xmlns:xlink="http://www.w3.org/1999/xlink" ...
- 729
5
votes
1
answer
222
views
Force label to be along the lower perimeter of a polygon in QGIS
Some of my grave plot numbers are rendering on the L/R boundaries of polygons rather than being always on the bottom line.
How can I force this?
These are my Label settings. I have tried the Angle ...
- 8,298
1
vote
1
answer
152
views
How to enable automatic georeferencing of hand drawn lines
Our company does a lot of bird surveys, we often need to draw flight patterns on a paper maps and convert these lines into shapefiles to create digital maps (e.g. of migration routes) for our reports.
...
- 11
1
vote
0
answers
179
views
Legend Spacing in tmap
My problem is that I am using tmap to create cartographic maps, and similar to ggplot I need legend spacing between the legend keys but I can not figure out how to implement the legend spacing in tmap....
- 11
1
vote
1
answer
120
views
Making world map with terrain colours in QGIS
In QGIS I would like to create a world map that has terrain colours (e.g., deserts or vegetation), as in the attached map (Gehring et al. 2022), particularly for the African continent.
How should I ...
2
votes
1
answer
95
views
Is it possible to have a diffuse transition between two polygons?
(QGIS)
I'm working on a habitat map. The aim is to map the different habitats in an area in order to produce a map. The habitats are identified by polygons. But sometimes habitats are gradually ...
- 21
6
votes
2
answers
274
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
6
votes
1
answer
115
views
Displaying densely curved vectors at smaller scales
Some time ago I came across a QGIS cartographic technique that solved a problem that occurs when detailed vector data is displayed at smaller scales: densely-curving lines become smudged and look ...
- 8,356
5
votes
1
answer
115
views
Dividing the scale bar to the left of zero in QGIS
I'd like to add a 2.5 km value on the left of the 0 value in my scale (divide the rectangle from 0 to 5 into two smaller ones). How to do it?
- 317
1
vote
2
answers
202
views
How to rotate a SVG symbol based on a formula of column value and literal value (90 degrees) in GeoServer
I have a shapefile that I have stored in GeoServer. I have some SVG symbols that I want to use for each point. I want the SVG symbols to rotate based on the orientation column (attribute value) in the ...
- 729
1
vote
1
answer
74
views
Overlay colors onto specific 1 degree x 1 degree grid squares in R
I am trying to color in specific grid cells within a map to highlight sampling effort.
I can generate the map but then I am unsure how to use utilize the data points I have to color in the entire grid ...
- 23
2
votes
1
answer
94
views
What is this "flag" marker in bottom right corner of altas? [closed]
A relative has a "Political map of the world" on the wall in their house.
It has this "Flag" symbol in the bottom right corner. There are no other symbols like it on the map.
What ...
- 128
1
vote
0
answers
197
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.
...
- 31
-1
votes
1
answer
378
views
Is there a way to make land classifications with simple RGB satellite images?
The area of interest I am working on mapping is quite small, just under 10 acres. I need to create simple landcover vectors (trees, low vegetation/grass, water). I don't have access to high enough ...
- 211
6
votes
2
answers
475
views
Creating graduated classes for election swing map in QGIS
I am using QGIS right now to create an election swing map. This is different from a usual election map in that it measures differences in winning margins from one election to another. For example, Joe ...
2
votes
0
answers
42
views
How to colorize hierarchically-ordered polygons?
I have to implement a solution for coloring a lot of polygons that are derived from a hierarchically-ordered dataset. The dataset can be compared to a family tree in terms of hierarchy. Most of the ...
- 129
5
votes
3
answers
708
views
Creating nested hex grids in QGIS
I'm looking to replicate the kind of map seen here, where there are essentially multiple hex grids nested inside one another.
Author : Kate Berg
That example was made in ArcGIS Pro, whereas I'm ...
- 367
0
votes
0
answers
23
views
Making line thickness based on the sum of overlapping lines in QGIS [duplicate]
In QGIS 3.22.2 I have used the ORS distribution calculation tool to work out the number of vehicles that go from one origin to multiple destinations. I am trying to represent this number as a line ...
- 1
4
votes
1
answer
3k
views
Creating symbology based on range of values in QGIS
I would like to create a map in QGIS 3.16.13 where I am able to distinguish between forest cover increase, decrease, and stable forest.
My values are between -99 and 100. How do I create a colouring ...
- 151
1
vote
1
answer
281
views
Prism-map with QGIS (2.5 D)
I am trying to make a Prism Map with the 2.5 D Renderer with latest QGIS. Unfortunately the map does not look like expected. The prism for the boundary with the highest value looks "inverted"...
- 7,235
4
votes
1
answer
441
views
What is the difference for a shapefile line feature length between "Cartesian" and "ellipsoid"
I use QGIS for a hobby project on American historical railroads. When digitizing a quite short section of railroad line, giving a polyline feature in a shapefile, QGIS gives two values for the line ...
4
votes
1
answer
608
views
QGIS: Style polygon outline as a dashed line with an inner gradient
Is it possible to create a polygon outline as a dashed line with an inner gradient (see image #1)? Currently I have a hack job that sort of works (shapeburst fill with a dashed line above in the ...
- 500
6
votes
2
answers
974
views
Preventing labels from covering symbols in QGIS 3
In a single point dataset is it possible to get the labels to stop covering the symbols and be placed in a position that has white space automatically (i.e. without using data defined xy positions)?
...
- 8,298
3
votes
1
answer
804
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 ...
- 141
1
vote
2
answers
90
views
Digitizing photographs of a map
Is it possible to digitize the photographs of very old maps, having no co-ordinates. The photographs are exactly like this. If possible, could somebody tell me how to proceed? I have access to ArcGIS ...
- 13
3
votes
2
answers
52
views
Line cut off (doesn't fit) in map -- any cartographic convention?
Anyone would know if there is any cartographic convention on representing/symbolizing a line that doesn't fit on my layout map? Should I represent it using an arrow at the end.. or something else?
...
- 31
0
votes
0
answers
421
views
How to create a US map in R with separation between states, when using albersusa & plotly?
Does anyone have know how to access the longitude and latitude in albersusa?
Currently, I'm working with a choropleth U.S. map in R using albersusa and the plot_geo() function from the plotly package (...
0
votes
0
answers
279
views
How can I draw a vegetation profile on ArcMap or QGIS?
I have two layers: elevation (raster) and vegetation map (polygons). I would like to generate an elevation profile with a line that besides having the elevation form, appears the length of the ...
- 1
5
votes
1
answer
839
views
Render Roads in QGIS using z-order like in OpenStreetMap
I am using QGIS with OpenStreetMap data and I am trying to copy the way OpenStreetMap renders the order of their roads using the 'z-order' field. I am very close, I managed to use the layer properties ...
- 135
3
votes
2
answers
666
views
Creating singleband pseudocolor ramp displaying colors based on values using QGIS
With QGIS desktop, I'm trying to create a ramp to a DEM using a singleband pseudocolor style. I have created a ramp with 15 different colours and values as well.
I can't find the option to apply those ...
- 51
3
votes
0
answers
347
views
Making bivariate symbol map in QGIS
I am making a bivariate symbol map in QGIS in which, the size of the symbol depends on one variable whereas the color on other. For example, I have taken India data from https://simplemaps.com/data/in-...
- 107
1
vote
0
answers
518
views
Creating Choropleth Map using points in ArcGIS Pro
As seen in the picture, the purple/yellow points represents yes/no, and the location of the points are based on home locations of the respondents.
In ArcGIS Pro I would like to create a choropleth ...
- 31
1
vote
2
answers
424
views
Making bivariate proportional symbol map in QGIS
I have data on two characteristics for a particular variable, say volume and quality. I want to plot these using proportional symbol map in QGIS. For Volume, I could plot using: Symbology -> ...
- 107
6
votes
1
answer
547
views
Is it possible to display all icons and labels but not cover other icons in QGIS?
I've been trying to find a way to automatically distribute icons and labels from different data sources so that they don't cover each other at any scale.
The PDF will have the data showing at this ...
- 8,298
0
votes
0
answers
48
views
What is the size of a geom at a given scale?
I have a dataset with many overlapping grid cells. I would like to represent the cells in such a way that each grid cell is represented with one point. To avoid having the points overlapping each ...
- 3,201
9
votes
1
answer
1k
views
Vertically and Horizontally align the labels in multi-column QGIS legends
In QGIS 3.18 (and older versions) I noticed that the first item in a multi-column legend isn't aligned with the items in other columns. I have played with the settings in the Spacing column but can't ...
- 8,298
2
votes
2
answers
212
views
QGIS 3.16 - I want to make by 6"x9" map a 24x36, but all of the text/layers are tiny. Is it possible to automatically scale all of the layers?
I recently got a freelancing gig and am really excited, but I'm having troubles exporting my map in a different size in QGIS. My client wants a map sized 24"x36", and I have created one that'...
- 21
1
vote
0
answers
35
views
Representing clustered points above 80,000 in map using ArcGIS 10.2.1 in such a way that their labels and points themselves are clearly visible?
I have places of Pakistan which are 85949 in number, I want to display them on a static map in such a way that points and their labels are readable and they don't overlap or map doesn't look messy. I ...
- 11
1
vote
0
answers
141
views
Gauss-Krüger system to Unity cartesian Coordinate Conversion
I have to deal with coordinate conversation into my unity (a game engine which uses cartesian co-ordinate) project but I am zero in this field as it is involved math, geometry, and geography with lots ...
14
votes
3
answers
1k
views
Adding extent lines to overview maps in QGIS Print Composer
Is there a way of automatically adding lines to overview maps in QGIS 3 Print Composer?
At Creating zoomed in portion of map in print composer it is done manually, but since I have several overview ...
- 419
3
votes
0
answers
29
views
Adjusting buffer between arrows and both begin and end points separately [duplicate]
I'm currently making a map of the Netherlands in which the flow of student migrations upon or shortly after their graduation is depicted. Here's what I've made so far:
I'm getting a bit more pleased ...
2
votes
1
answer
1k
views
Equal area map projections: Lambert azimuthal or Albers conic?
When making small-scale regional maps on the order of 500-5000 km in extent where an equal-area projection is desirable, which would you prefer, the Lambert azimuthal or Albers conic? I realize this ...
- 129
0
votes
0
answers
69
views
How Is 4d Cartography Best Applied to Add Value to the Viewer?
I’m about to write my bachelor thesis in Geography with my main focus being GIS. I’m still in the process of finding a good topic. My supervisor and I narrowed it down to 4D cartography and if and how ...
- 135
1
vote
1
answer
99
views
Data from REST service shows symbology for items not on my map
I am using QGIS 3.4 to display eelgrass data from this website:
https://geo.wa.gov/datasets/8ef27802b6cf4b61b814c80dd91d6e9e.
To get the specific layer I need I use this link to connect to an ArcGIS ...
- 10.5k
4
votes
2
answers
680
views
Ceating cross-sectional styled visualisation of multiple layers in map
Is it possible to create a map using multiple layers to visual them in a cross-sectional manner in QGIS, ArcGIS or R?
I have attached two examples to illustrate what I want to achieve.
- 197