如何用外部图像填充地图边界? [英] How to fill map boundaries with external images?

问题描述

我正在创建一个带有州边界的巴西地图，可以直接使用 ggplot2 和 geom_sf 来实现.

但是，这次，我不想用数据填充每个州的颜色，而是要使用外部图像(png)填充每个州的边界，类似于

我尝试了 geom_image 甚至 geom_flag 的一些设置都没有用(因此为什么我不在这里发布任何代码).

关于如何解决此问题，有什么建议吗?

解决方案

您可以尝试 cartography :: getPngLayer/pngLayer .这两个函数将png作为输入，对其进行地理标记并将其裁剪为给定多边形的形状，并创建一个您可以操作和绘制的 rasterbrick 对象(作为图块):

https://dieghernan.github.io/cartographyvignette#png-layer

I am creating a map of Brazil with its state boundaries, which is straight forward to achieve using ggplot2 and geom_sf.

However, this time around, instead of color filling each state with data, I want to fill each state's boundaries with an external image (png), similar to this example of the largest employer in each state.

I have tried a few settings of geom_image and even geom_flag to no avail (hence why I am not posting any code here).

Are there any suggestions on how to approach this problem?

解决方案

You can try cartography::getPngLayer/pngLayer. These two functions takes a png as input, geotag and crop it to the shape of a given polygon and creates a rasterbrick object (as a tile) that you can manipulate and plot:

https://dieghernan.github.io/cartographyvignette#png-layer

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