Image is getting blinked when moving from one latitude-longitude to another latitude-longitude when using image_url while when using scatter plot, marker is not getting blinked.
Can someone please provide a solution for not blinking the image while using imageurl.
Here is the code`’’’
FLIGHT TRACKING WITH PYTHON AND OPEN AIR TRAFFIC DATA
by ideagora geomatics | www.geodose.com | @ideageo
‘’’
#IMPORT LIBRARY
import requests
import json
import pandas as pd
from bokeh.plotting import figure
from bokeh.models import HoverTool,LabelSet,ColumnDataSource
from bokeh.tile_providers import get_provider, STAMEN_TERRAIN
import numpy as np
from bokeh.server.server import Server
from bokeh.application import Application
from bokeh.application.handlers.function import FunctionHandler
#FUNCTION TO CONVERT GCS WGS84 TO WEB MERCATOR
#DATAFRAME
def wgs84_to_web_mercator(df, lon=“long”, lat=“lat”):
k = 6378137
df[“x”] = df[lon] * (k * np.pi/180.0)
df[“y”] = np.log(np.tan((90 + df[lat]) * np.pi/360.0)) * k
return df
#POINT
def wgs84_web_mercator_point(lon,lat):
k = 6378137
x= lon * (k * np.pi/180.0)
y= np.log(np.tan((90 + lat) * np.pi/360.0)) * k
return x,y
#AREA EXTENT COORDINATE WGS84
lon_min,lat_min=-125.974,30.038
lon_max,lat_max=-68.748,52.214
#COORDINATE CONVERSION
xy_min=wgs84_web_mercator_point(lon_min,lat_min)
xy_max=wgs84_web_mercator_point(lon_max,lat_max)
#COORDINATE RANGE IN WEB MERCATOR
x_range,y_range=([xy_min[0],xy_max[0]], [xy_min[1],xy_max[1]])
#REST API QUERY
user_name=’’
password=’’
url_data='https://’+user_name+’:’+password+’@opensky-network.org/api/states/all?’+‘lamin=’+str(lat_min)+’&lomin=’+str(lon_min)+’&lamax=’+str(lat_max)+’&lomax=’+str(lon_max)
#FLIGHT TRACKING FUNCTION
def flight_tracking(doc):
# init bokeh column data source
flight_source = ColumnDataSource({
‘icao24’:,‘callsign’:,‘origin_country’:,
‘time_position’:,‘last_contact’:,‘long’:,‘lat’:,
‘baro_altitude’:,‘on_ground’:,‘velocity’:,‘true_track’:,
‘vertical_rate’:,‘sensors’:,‘geo_altitude’:,‘squawk’:,‘spi’:,‘position_source’:,‘x’:,‘y’:,
‘rot_angle’:,‘url’:
})
# UPDATING FLIGHT DATA
def update():
response=requests.get(url_data).json()
#CONVERT TO PANDAS DATAFRAME
col_name=['icao24','callsign','origin_country','time_position','last_contact','long','lat','baro_altitude','on_ground','velocity',
‘true_track’,‘vertical_rate’,‘sensors’,‘geo_altitude’,‘squawk’,‘spi’,‘position_source’]
flight_data=response[‘states’]
flight_df=pd.DataFrame(flight_data,columns=col_name)
wgs84_to_web_mercator(flight_df)
flight_df=flight_df.fillna(‘No Data’)
flight_df[‘rot_angle’]=flight_df[‘true_track’]*-1
icon_url=‘https:…’ #icon url
flight_df[‘url’]=icon_url
# CONVERT TO BOKEH DATASOURCE AND STREAMING
n_roll=len(flight_df.index)
flight_source.stream(flight_df.to_dict(orient='list'),n_roll)
#CALLBACK UPATE IN AN INTERVAL
doc.add_periodic_callback(update, 5000) #5000 ms/10000 ms for registered user .
.
#PLOT AIRCRAFT POSITION
p=figure(x_range=x_range,y_range=y_range,x_axis_type=‘mercator’,y_axis_type=‘mercator’,sizing_mode=‘scale_width’,plot_height=300)
tile_prov=get_provider(STAMEN_TERRAIN)
p.add_tile(tile_prov,level=‘image’)
p.image_url(url=‘url’, x=‘x’, y=‘y’,source=flight_source,anchor=‘center’,angle_units=‘deg’,angle=‘rot_angle’,h_units=‘screen’,w_units=‘screen’,w=40,h=40)
p.circle(‘x’,‘y’,source=flight_source,fill_color=‘red’,hover_color=‘yellow’,size=10,fill_alpha=0.8,line_width=0)
#ADD HOVER TOOL AND LABEL
my_hover=HoverTool()
my_hover.tooltips=[('Call sign','@callsign'),('Origin Country','@origin_country'),('velocity(m/s)','@velocity'),('Altitude(m)','@baro_altitude')]
labels = LabelSet(x='x', y='y', text='callsign', level='glyph',
x_offset=5, y_offset=5, source=flight_source, render_mode='canvas',background_fill_color='white',text_font_size="8pt")
p.add_tools(my_hover)
p.add_layout(labels)
doc.title='REAL TIME FLIGHT TRACKING'
doc.add_root(p)
SERVER CODE
apps = {’/’: Application(FunctionHandler(flight_tracking))}
server = Server(apps, port=8084) #define an unused port
server.start()
`