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import json
import os
import leafmap.foliumap as leafmap
import leafmap.colormaps as cm
import streamlit as st
st.set_page_config(layout="wide")
st.sidebar.info(
"""
- Web App URL: <https://streamlit.gishub.org>
- GitHub repository: <https://github.com/giswqs/streamlit-geospatial>
"""
)
st.sidebar.title("Contact")
st.sidebar.info(
"""
Qiusheng Wu at [wetlands.io](https://wetlands.io) | [GitHub](https://github.com/giswqs) | [Twitter](https://twitter.com/giswqs) | [YouTube](https://www.youtube.com/@giswqs) | [LinkedIn](https://www.linkedin.com/in/giswqs)
"""
)
@st.cache_data
def load_cog_list():
print(os.getcwd())
in_txt = os.path.join(os.getcwd(), "data/cog_files.txt")
with open(in_txt) as f:
return [line.strip() for line in f.readlines()[1:]]
@st.cache_data
def get_palettes():
return list(cm.palettes.keys())
# palettes = dir(palettable.matplotlib)[:-16]
# return ["matplotlib." + p for p in palettes]
st.title("Visualize Raster Datasets")
st.markdown(
"""
An interactive web app for visualizing local raster datasets and Cloud Optimized GeoTIFF ([COG](https://www.cogeo.org)). The app was built using [streamlit](https://streamlit.io), [leafmap](https://leafmap.org), and [Titiler](https://developmentseed.org/titiler/).
"""
)
def is_trusted_url(url):
if url.startswith("https://opendata.digitalglobe.com/events/california-fire-2020/"):
return True
else:
return False
row1_col1, row1_col2 = st.columns([2, 1])
with row1_col1:
cog_list = load_cog_list()
cog = st.selectbox("Select a sample Cloud Opitmized GeoTIFF (COG)", cog_list)
with row1_col2:
empty = st.empty()
url = empty.text_input(
"Enter a HTTP URL to a Cloud Optimized GeoTIFF (COG)",
cog,
)
if is_trusted_url(url):
try:
options = leafmap.cog_bands(url)
except Exception as e:
st.error(e)
if len(options) > 3:
default = options[:3]
else:
default = options[0]
bands = st.multiselect("Select bands to display", options, default=options)
if len(bands) == 1 or len(bands) == 3:
pass
else:
st.error("Please select one or three bands")
else:
st.error("Please enter a trusted URL")
add_params = st.checkbox("Add visualization parameters")
if add_params:
vis_params = st.text_area("Enter visualization parameters", "{}")
else:
vis_params = {}
if len(vis_params) > 0:
try:
vis_params = json.loads(vis_params.replace("'", '"'))
except Exception as e:
st.error(
f"Invalid visualization parameters. It should be a dictionary. Error: {e}"
)
vis_params = {}
submit = st.button("Submit")
m = leafmap.Map(latlon_control=False)
if submit:
if url:
try:
m.add_cog_layer(url, bands=bands, **vis_params)
except Exception as e:
with row1_col2:
st.error(e)
st.error("Work in progress. Try it again later.")
with row1_col1:
m.to_streamlit()
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