26 votes

Making world map to show where hole drilled through centre of Earth starts/ends on land vs water?

The location on the opposite side of the earth from your point is called your antipode or antipodal location. If you want to produce an antipodes map on your own there is a simple relation to consider:...
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  • 1,579
23 votes
Accepted

Styling border to match fill in QGIS?

I'm not sure how to enforce it for existing polygons, but you could make it work for any future ones that you create. In Project Properties>Default styles>Style Manager, you could create your own ...
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  • 546
17 votes

Polygon gradient fills / tint bands in QGIS

For what it's worth, support for these kinds of fills has now been added into QGIS and will be available from version 2.4. You just need to select "Shapeburst fill" as the symbol layer type: ...
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  • 26.2k
17 votes
Accepted

Is there a name for the geographic coordinate 0,0?

The point at (0°, 0°) is not generally given a name All geographers, cartographers and surveyors ought to know the following, but I reference some sources anyway: According to Matt Rosenberg The ...
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  • 8,584
17 votes
Accepted

Using dynamic text to display layer credits

As mentioned in my comment above, there isn't a way to do this using dynamic text. However, you could write a script to do this and attach it to a python addin button or to run when you save the MXD ...
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  • 21.2k
17 votes
Accepted

Is it appropriate to create vertical scale bars?

The only reasons I can see why it would not be appropriate to use a vertical scale bar would be: The audience does not want it or does not understand it The audience associates the vertical scale ...
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  • 6,360
16 votes

Plotting map resulted from kriging in R

In order to interpolate prices with kriging you first need to convert your geographic coordinates to projected coordinates. Assuming you have them, below there is a reproducible example, showing a way ...
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  • 9,759
16 votes
Accepted

Can someone help me identify this part of the map?

Here you find the map including the legend. The legend is in German, but I am German, so I tried to translate it as precise as possible. I think (and please @Giancarlo correct me, if you disagree): ...
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  • 874
15 votes

How to convert a spatialpolygon to a SpatialPolygonsDataFrame and add a column to the attribute table

What do the "coast", "ro" and "bc" objects have to do with your problem? The issue may lie in that you are using "readShapeSpatial". Have you tried readOGR in rgdal? If you are reading a polygon ...
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15 votes

Is it appropriate to create vertical scale bars?

One reason would be (I think it is mentioned in one of the comments) is that the vertical scale bar may not accurately represent the distance of the railway track. This would be due to the likelyhood ...
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  • 72.2k
13 votes

How to cartographically represent water flow?

While Jacub is correct that a stream ordering technique is your best bet for being able to represent stream magnitude or discharge, since the position in the network is a surrogate for these two ...
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  • 10.8k
13 votes

How to make dashed lines between adjacent polygons render correctly in QGIS?

To this kind of interesting but recurring cartographic question, there is different approaches (some suggested in the comments): The classic approachs is to use dashed lines with a white solid line ...
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  • 7,478
13 votes

Interactive and dynamic map with wind data in R leaflet?

I missed some information in your dataset such as the CRS and timestamp; so I created my own dataset to provide a reproducible example. Here is one suggestion for creating interactive wind maps: one ...
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  • 9,759
13 votes
Accepted

Relating text buffer to text size in QGIS?

Create a data defined field (Font_size) and set the font size in the label properties to be dependent on this field. Create a virtual field (VRT_Buffer) with the following formula : to_real( "...
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  • 7,478
13 votes

Designing Borders with QGIS

Option 1 - Quickest way There is actually a quite immediate way to obtain that effect: double click on the layer you want to style (in your case the border layer) under Symbology select Hashed line ...
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  • 5,207
12 votes
Accepted

Manually classifying graduated data outside of range in ArcGIS for Desktop?

It's definitely a major pain when ArcMap tries to be, um, helpful even when you really don't want it to be. One workaround I've found is to create a new temporary dataset, and add a few points with ...
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  • 20.5k
12 votes

Is there a name for the geographic coordinate 0,0?

It's "there where all the data shows up when something goes wrong". At least that's how I call it, or how I often detect when something went wrong. Others would call it Null Island, which is often ...
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  • 6,209
11 votes
Accepted

Is it possible to create a round map frame in QGIS Map Composer to create circumpolar maps?

There's currently no out-of-the-box functionality for this in Print Composer. As a work-around, you can add graticules as a separate layer and label their end points, like here: For a full how to, ...
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  • 81.8k
11 votes

Generating urban footprint polygons from building clusters in QGIS?

I was able to get some quite good results, with thanks to Michael Stimson for the suggestion. I had forgotten about the "buffer out, buffer back in" trick (this can also help reduce the number of ...
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  • 19.7k
11 votes

Producing Space-Time Cube in QGIS

One option to do this would be by modifying your data and visualizing it with the excellent qgis2threejs plugin. The idea is to turn your your time to Z coordinates. I tried it out with two GPX tracks ...
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  • 553
10 votes

Convert a spatial polygon object to data frame using R

Problems: 1: the outcome of UnionSpatialPolygons is a spatial polygon 2: converting the result back into a spatial polygon data frame is a real pain -a. you need a very exact data frame to attach ...
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  • 303
10 votes
Accepted

How to cartographically represent water flow?

You can classify the streams using, among others, the Strahler Stream Ordering method. In the Strahler method, all links without any tributaries are assigned an order of 1 and are referred to as ...
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10 votes
Accepted

Appropriate map projection for the Pacific Ocean

It appears to be a truncated Mollweide projection, centred on 160°W. Googling the image gives http://odtmaps.com/detail.asp?product_id=WE-Pac-Rim-32x47rolled, which lists the projection as "...
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  • 216
10 votes

How to convert a spatialpolygon to a SpatialPolygonsDataFrame and add a column to the attribute table

Try: #Code taken from the question: s_po <- SpatialPolygonsDataFrame(bc, buf_df, match.ID = F) match.ID avoids the requirement of rownames for match polygons ID
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  • 101
10 votes

Creating map with same-area hexagonal polygons using ArcGIS for Desktop?

(1) I have usually heard of it referred to as a "Hexagonal Map" or "Hexagonal Grid Map". Both queries turn up a lot of relevant results in Google. Example Link Here: http://anitagraser.com/2012/03/...
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  • 146
10 votes
Accepted

Group and align icons in QGIS atlas

You can achieve the following using some expression-based SVG symbols. Basically, you'd have multiple attributes that determine icon #1, #2, and so on. As far as I know, it is currently not ...
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  • 81.8k
10 votes

Is there a way of labeling the number of points with the same coordinates?

If I understand, you want aggregate a layer by location. You will need SQL for that, so create a virtual layer (Qgis >= 2.14) with a query like : SELECT geometry, count(*) AS count FROM your_layer ...
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  • 841
10 votes
Accepted

Group legend in ArcMap basing on field value

Here is one solution on top my head: Create a new string field and use field calculator to compute as the concatenation of other fields. Here is the python snippet: !abbrev! + ' ' + !fullname1! +'...
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10 votes
Accepted

Labeling (one-way) streets in QGIS?

You don't need to dissolve lines by name, as you can use the Merge connected lines to avoid duplicate labels option in the Rendering tab of Labels' options. This will reduce the number of labels, and ...
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9 votes
Accepted

Making bivariate colour ramp with QGIS

Excellent answer by @Martin but it seems you have 2 attributes you want to have a colour gradient (Plantation Cover and Forest Harvesting Intensity). If I'm mistaken then I will remove this post. You ...
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  • 72.2k

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