Question 1

How to fix a blank SVG file when using `save_as` in prettymaps plotter mode?

Accepted Answer

This was a bug in prettymaps' plotter mode, not a problem with your plotting parameters. It was fixed in commit `3f3b8be`. Update to a version containing that fix, then rerun the plot. In Google Colab, install the fixed version with:

`!pip install git+https://github.com/marceloprates/prettymaps.git@3f3b8be`

Restart the runtime if prompted, then run your code again, for example:

`prettymaps.plot(..., mode='plotter', save_as='barcelona_plot.svg')`

The generated SVG should no longer be blank.

Question 2

Why does the first Prettymaps render take about 10 minutes while using almost no CPU?

Accepted Answer

The delay is caused by OSMnx waiting on the public Overpass API, which throttles requests. Enable logging with `ox.config(log_file=True)` and look for messages such as `Pausing 56 seconds before making HTTP POST request`. The first fetch is therefore network-bound, not CPU-bound. OSM responses are cached on disk, so subsequent renders of the same area should be much faster. Keep the cache between runs, update to a version containing the disk-cache fix, and reduce the map area or number of OSM layers to minimize Overpass requests.

Question 3

How to fix missing river or water geometry when plotting a city by name in prettymaps?

Accepted Answer

This is caused by the geometry-perimeter intersection dropping OSM features that cross the named area's boundary. As a workaround, plot with coordinates and a radius instead of a place name:

```python
plot((48.8534, 2.3397), radius=7000, ...)
```

To keep the named perimeter, patch `get_geometries()` in `prettymaps/fetch.py`. Replace:

```python
geometries = geometries.intersection(perimeter)
```

with:

```python
geometries = [geo.intersection(perimeter).buffer(0) for geo in geometries.geometry]
```

The `.buffer(0)` call repairs invalid intersection results and preserves multiple polygons. Alternatively, upgrade to a prettymaps release containing the fix tracked in issue #51 / the "Fix geometry-perimeter intersection" PR.

Question 4

How do I prevent a Python package with many dependencies from breaking my existing Python installation?

Accepted Answer

Install the package inside an isolated virtual environment instead of your system Python. For `venv`, run: `python3 -m venv .venv`, then activate it with `source .venv/bin/activate` on Linux/macOS or `.venv\Scripts\activate` on Windows, and install the package with `pip install `. With Conda, run: `conda create -n myenv python=3.11 -y`, then `conda activate myenv`, and install the package using `pip install ` or `conda install `. This keeps dependency versions separate from your OS Python and avoids version conflicts.

Question 5

How can I color bridges or specific OSM street tags differently without changing road width?

Accepted Answer

Plot the bridges as a separate layer and apply a per-layer style. For bridge structures, define a layer such as `"bridge": {"tags": {"man_made": "bridge"}}`. For bridge-tagged highway segments, use a separate road layer with a `custom_filter` that selects ways with `bridge=yes`. Give this layer a different color and higher `zorder`/z-height so it renders above the normal road layer, while leaving the base highway layer's width configuration unchanged. If the styling API requires explicit values, set the bridge layer to the same line-width mapping used by the road layer.

prettymaps

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