Questions tagged [cartography]
Using artistic and scientific principles for creating maps and graphically representing geographic areas
861
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How to get bbox coordinates of text on cartopy map
I'm making a map using cartopy in python and am labeling the countries based on the centroid of the country. However, if a name extends outside of the map's crop I would like to move the label so that ...
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1
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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 ...
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2
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191
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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
...
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7
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How cell values are computed by cartography::getGridLayer?
I'm trying to figure out how the "average" cell values are calculated by the cartography::getGridLayer function, with the var argument, but the documentation is elliptical. It says: "...
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190
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Making two-way flow map in QGIS
Is there a way to make, with a clear process, a two-way flow map (possibly curved) in QGIS 3?
I have seen some tutorials, but not detailed enough (at least for a bad coder like me); I have tried the ...
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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 ...
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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?
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2
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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 ...
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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 ...
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2
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1
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63
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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 ...
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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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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 ...
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2
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314
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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 ...
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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 ...
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3
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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 ...
- 295
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23
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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 ...
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3
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1
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991
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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 ...
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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"...
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214
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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
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336
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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 ...
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2
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612
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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)?
...
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467
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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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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 ...
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2
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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?
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342
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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 (...
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161
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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 ...
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1
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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 ...
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2
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364
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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 ...
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252
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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-...
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334
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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 ...
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2
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296
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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 -> ...
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1
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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 ...
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37
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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 ...
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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 ...
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2
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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'...
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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 ...
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112
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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 ...
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29
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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 ...
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2
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1
answer
915
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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 ...
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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 ...
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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 ...
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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.
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4
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Adding meridians and parallels on world map in QGIS
I'm working on a world map in which I'm using as overlapped layers Bing Aerial, The natural Earth Vector (from natural earth data.com), and also a NASA night view because it's just nice!
I would like ...
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680
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Transforming Cassini coordinates to UTM
Why is it that when I transform certain Cassini coordinates to UTM, they give negative UTM coordinates, which should not be the case. Note that the equator passes through this particular area of ...
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6
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1
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234
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Colouring contour lines differently when they are inside polygons of another layer
I'm a complete noob to QGIS.
I am working with New Zealand Topo 1:50.000 data from LINZ. I have snow polygons and over them contour lines. Where the lines cross the polygons I want to change the ...
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1
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QAD Plugin QGIS
Is QAD compatible with QGIS 3.14 "Pi"?
I've several issues with it.
Only with the points, the rotation and simetry does not work. Polygons and lines work perfectly.
Rotate, simetry, etc, ...
1
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1
answer
149
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Which datum and projection to use?
First sorry if I am incorrect in the words, I am using a translator to expose my doubt.
I have a requirement where I have a worldwide road base and my goal is to calculate the road network by country.
...
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1
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573
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What page size to insert a map into a report?
50% of my job is creating map figures in ArcGIS, most of which end up being inserted in Word documents. We use A4 MXD templates, but the maps end up much smaller when inserted into a report. So it ...
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1
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632
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Setting leader line properties of annotation feature classes
How does one go about setting leader line properties with an annotation feature class? When I reduce the size of the font of the annotation, the leader line stays the same size, so currently I have ...
5
votes
1
answer
670
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Blending features in QGIS: Approximating road edges for map render
I'm having trouble getting the right render for the tertiary roads and service roads look in my map render. I'm trying to get road edges like in the old USGS topo maps:
Notice how the road interior ...
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