# Producing "inverted" CAPPI maps

**URL:** <https://openradar.discourse.group/t/producing-inverted-cappi-maps/642>\
**Category:** Retrievals\
**Tags:** py-art\
**Created:** [August 28, 2025, 10:22am UTC](https://openradar.discourse.group/t/producing-inverted-cappi-maps/642 "2025-08-28T10:22:16Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![gene\_cgha](https://yyz2.discourse-cdn.com/free1/user_avatar/openradar.discourse.group/gene_cgha/32/405_2.png) [@gene\_cgha](https://openradar.discourse.group/u/gene_cgha)\
**Post date:** [August 28, 2025, 10:22am UTC](https://openradar.discourse.group/t/producing-inverted-cappi-maps/642/1 "2025-08-28T10:22:16Z")

</div>

Hi all,

I’m currently working with CfRadial data and trying to generate a CAPPI of reflectivity using Py-ART. I followed the example here: [Compare PPI vs CAPPI — Py-ART 2.1.0 documentation](https://arm-doe.github.io/pyart/examples/plotting/plot_cappi.html?utm_source=chatgpt.com)

However, when plotting with

```auto
cappi_display = pyart.graph.RadarMapDisplay(cappi)
fig, ax = plt.subplots(1, 2, figsize=(13, 5))
…
cappi_display.plot_ppi(“corrected_reflectivity”, vmin=0, vmax=60, ax=ax[1], cmap=“NWSRef”)
ax[1].set_title(“CAPPI Reflectivity at 2000 m”)

```

the reflectivity field seems to come out “rotated/misaligned” compared to the actual radar scan. Has anyone encountered this “rotation” issue when plotting CAPPI from CfRadial data? If so, is there a way/solution to this matter?

Lastly, is it possible to add a basemap (cartopy or otherwise) to the CAPPI for better georeferencing? A simple working example would be very helpful since it seems to “cut off” some of the data for some unknown reason.

Thanks a lot in advance for any guidance or example code!

Also see the sample CfRadial data that I used and plotted. [CfRadial Data](https://drive.google.com/file/d/174mEihWwHgjVmuewZSwchIklb-O-k2d8/view?usp=sharing)

 ![image](https://global.discourse-cdn.com/free1/uploads/openradar/original/1X/d7a54c76d974954504f251c1d276a1502e7563df.png)