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https://github.com/fabianehmel/haacker

A library of scripts to generate static maps using open source technology.
https://github.com/fabianehmel/haacker

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A library of scripts to generate static maps using open source technology.

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# Haacker



A library of scripts to generate static maps using open source technology.



## Background



### Purpose

This library was originally developed to support the design process of a printed butterfly map. You can find out more about the map itself in the related detailed [documentation](https://interface.fh-potsdam.de/butterfly/).



![preview of the butterfly map](map_preview.jpg)



### Naming

The library is named after [Hermann Haack](https://de.wikipedia.org/wiki/Hermann_Haack_(Kartograf)), a german cartographer.



## Installation



Install the requirements by running `npm install` in the root directory.



### Additional Requirements



If you want to process the ETOPO1 data, make sure that [GDAL](https://www.gdal.org/) is installed on your machine.



## Included tools



### ETOPO1 Data Processing (`process-etopo1-data`)



_TLDR: A Shell script that downloads and prepares the elevation data for the mapping process. Delivers a set of GeoJSONs for different elevation levels. Run it with `npm run process-etopo1-data` in the root directory._



If a map should contain elevation levels, data from a digital elevation model (DEM) is needed. The NOAA provides such a model in the GeoTIFF format. This file can be processed to a series of GeoJSONs that can be used by D3 to generate a map.



This shell script automatically downloads the GeoTIFF dataset and converts it to GeoJSON files. The script can be called with the command `npm run process-etopo1-data` in the root directory. By default, it generates GeoJSONs for each hundred meter level, starting from -10,000 meters (sea ground) to 9,000 meters (Himalaya). The resulting files are therefore:



- `-10000.geojson` (lowest sea level)

- `-9900.geojson`

- `many more sea level files…`

- `-100.geojson`

- `0.geojson` (first landmass file)

- `100.GeoJSON`

- `many more landmass files…`

- `9000.GeoJSON`



These settings can be tweaked in the section `your settings` in the file `process-etopo1-data/main.sh`.



**Attention: Depending on the settings and your machine, this script might take several hours to run!**



### Map Layer Generation (`render-map-layer`)

_A node application that renders a map layer for given GeoJSON data. Uses d3 and it's projections._



The map generation is controlled with a config file, see the file `config.example.js` as an example. The config file sets the map’s dimensions and layers.



#### Layer types



The tool supports these layer types:



- `filled` — a filled layer, consisting of a a single GeoJSON

- `stroked` — an outlined layer, consisting of a a single GeoJSON

- `levels` — a series of filled levels, consisting of a set of GeoJSONs



#### Properties



##### `filters`

Filter the levels based on their height. Provide an array with filter functions as you would do in a JS `.filter` function. E.g., use `filters: [level => level > 0]` to only render layers above the sea level.



##### `domain``

: ["min", 0, "max"],



Please see the `config.example.js` for a reference how to use these layers. The config files need to be placed in the folder `render-map-layer`.

To run the script, use the command `npm run render-map-layer` in the root directory. By default, the script will look for a `config.js` file in the folder `render-map-layer`. If you want to use another file, provide it's name as a argument like this: `npm run render-map-layer my.special.config`.



### Map Label Generation (`render-map-label`)

_A node application that renders map labels as SVG for given GeoJSON data._



This works similar to the `render-map-layer` script. It also uses a `config.js` file. To run the script, use the command `npm run render-map-label` in the root directory.



The script outputs SVG files with labels and dots in the desired projection. It was only tested and is optimized for files from [Natural Earth](http://naturalearthdata.com).



### Map Cutline Generation (`render-map-cutline`)

_A node application that creates a cutline as SVG for a map._



This works similar to the `render-map-layer` script. It also uses a `config.js` file. To run the script, use the command `npm run render-map-cutline` in the root directory.



## Central folders



By default, the tools use a common data folder at `data`. Exported maps are saved in the folder `export`.

Also, a folder called `temp` is used in the root directory for temporary files.