Streamlit leafmap folium

jp12 · July 25, 2023, 1:37am

Hi, does anyone know why this happens?

I’m trying to plot data from a netcdf file to a leafmap/folium map using this tutorial

However, the data is not showing up on the map

My app:

https://test-app.streamlit.app/

The code:

import leafmap.foliumap as leafmap
import streamlit as st

st.header(‘Test’)

filename = ‘wind_global.nc’
geojson = ‘https://github.com/opengeos/leafmap/raw/master/examples/data/countries.geojson’
m = leafmap.Map(layers_control=True)
m.add_basemap(‘CartoDB.DarkMatter’)
m.add_velocity(filename, zonal_speed=‘u_wind’, meridional_speed=‘v_wind’)
m.to_streamlit()

thanks !

Charly_Wargnier · July 25, 2023, 7:19am

Hi @jp12,

Without knowing the exact error message you’re getting or having access to the data file you’re using, it’s difficult to diagnose the issue precisely.

Can you please provide more information?

Thanks,
Charly

jp12 · July 25, 2023, 9:58am

Hi @Charly_Wargnier,

There are no console errors

The repository with the data and code for this app is here:

github.com

josepaulo1233/test-leafmap/blob/main/test.py

import leafmap.foliumap as leafmap
import streamlit as st

st.header('Test')

filename = 'wind_global.nc'
geojson = 'https://github.com/opengeos/leafmap/raw/master/examples/data/countries.geojson'
m = leafmap.Map(layers_control=True)
m.add_basemap('CartoDB.DarkMatter')
m.add_velocity(filename, zonal_speed='u_wind', meridional_speed='v_wind')
m.to_streamlit()

Charly_Wargnier · July 25, 2023, 11:02am

Thanks for your prompt feedback, @jp12!

From what you shared, it seems that you’re attempting to load a local file, ‘wind_global.nc,’ but it’s unclear if that file is correctly uploaded and accessible from the Streamlit app.

If the file isn’t uploaded correctly or can’t be accessed, no data will be displayed.

Can you please confirm that this has indeed been uploaded?

Thanks,
Charly

jp12 · July 25, 2023, 2:11pm

Hi @Charly_Wargnier , thanks !

You were correct, the filename was wrong.

Now, there’s a error on prompt

Charly_Wargnier · July 25, 2023, 2:31pm

I’m not sure, but could you please check if the add_velocity function is supported by the foliumap backend of leafmap?

Thanks,
Charly