Les programmes présentés utilisent deux modules python, à installer une fois. Pour cela il faut exécuter les instructions : !pip install geopy et !pip install folium. Il suffit donc de "décommenter" les deux lignes ci-dessous (enlever les #), et d'exécuter la cellule.
#!pip install geopy
#!pip install folium
Les fonctions et démarches suivantes permettent d'obtenir la latitude et la longitude contenues dans une trame de type GPGGA (GPS). Le choix a été fait de procéder par étapes, et de visualiser les résultats
trame ="$GPGGA,095039.00,4910.763194,N,00022.968045,W,1,18,0.6,53.4,M,47.8,M,,*4A"
# on crée une liste en coupant la trame à chaque virgule
liste = trame.split(',')
liste
def latitude(listeGPGGA):
valeur = float(liste[2])#troisième terme de la liste, donc d'indice 2
degre = int(valeur/100)
minutes = valeur%100 #conserve les chiffres à partir des dizaines vers la droite
if liste[3]=='N':
return degre + minutes/60 #latitude Nord, donc positive
else :
return -degre - minutes/60 #latitude negative
def longitude(listeGPGGA):
valeur = float(liste[4])#cinquième terme de la liste, donc d'indice 4
degre = int(valeur/100)
minutes = valeur%100 #conserve les chiffres à partir des dizaines vers la droite
if liste[5]=='E':
return degre + minutes/60 #longitude Est, donc positive
else :
return -degre - minutes/60 #longitude negative
latitude = latitude(liste)
longitude = longitude(liste)
latitude, longitude
Le module geopy permet notamment de déterminer l'adresse d'un lieu repéré par ses coordonnées.
from geopy.geocoders import Nominatim
geocoder = Nominatim(user_agent="SNT") # placer une chaine de caractères quelconque
localisation = geocoder.reverse([latitude, longitude])
localisation.address
Ici, latitude et longitude ont des valeurs obtenues lors de la partie 1. On peut utiliser ce qui suit avec des coordonnées quelconques, en donnant des valeurs numériques aux variables latitude et longitude.
import folium
carte = folium.Map(location=[latitude, longitude], zoom_start=14)
folium.Marker([latitude, longitude],
popup="Rectorat",
#icon=folium.Icon(color='red')
).add_to(carte)
#si l'on souhaite créer un fichier html contenant la carte :
#carte.save('maCarte.html')
#si l'on souhaite afficher la carte dans le document jupyter :
carte
carte2 = folium.Map(location=[45.5, 2.0], zoom_start=6)
route = folium.PolyLine(
[[48.116178, -1.639469],#liste des coordonnées
[47.471627, -0.548873],
[47.393767, 0.682236],
[45.763663, 4.832724],
[45.218181, 5.807142]],
tooltip = "itinéraire Rennes-Grenoble" #message au survol
).add_to(carte2)
folium.Marker([48.116178, -1.639469], popup="Rennes").add_to(carte2)
folium.Marker([45.218181, 5.807142], popup="Grenoble").add_to(carte2)
#si l'on souhaite créer un fichier html contenant la carte :
#carte2.save('ma2eCarte.html')
#si l'on souhaite afficher la carte dans le document jupyter :
carte2
import folium
carte3 = folium.Map(location=[47, 2.6], zoom_start=6)
#outil d'affichage des coordonnées des lieux cliqués
carte3.add_child(folium.LatLngPopup())
zone = folium.Polygon(
[[51.0863,2.5323],#un exemple parmi d'infinies possibilités
[48.5457, -4.7461],
[43.3611, -1.7743],
[42.4072, 3.1421],
[43.9137, 7.8223],
[48.9730, 8.2288]],
color = 'green', fill = True
).add_to(carte3)
carte3
normandie = [[49.355568981262, -1.1196198636379],
[49.362395930026, -1.1150349421423],
[49.379887497495, -1.0921583687035],
[49.388493551822, -1.0782159992234],
[49.390752810392, -1.0581039796328],
[49.389584817643, -1.030230861026],
[49.392985914906, -1.0217757695616],
[49.39743637948, -0.98940345902679],
[49.39504140049, -0.93938187284516],
[49.39002775011, -0.91939336367386],
[49.381675557637, -0.90740489073828],
[49.371558349237, -0.88137714562161],
[49.362545824867, -0.85116019900865],
[49.357899826541, -0.8268800178819],
[49.349989308157, -0.75879493262363],
[49.347004293019, -0.72224467845688],
[49.347281971172, -0.69550391989566],
[49.345054424205, -0.64201902855212],
[49.340513964595, -0.62418682110984],
[49.34074582701, -0.59417938730252],
[49.346097088235, -0.55324813273511],
[49.345015391903, -0.51530983971648],
[49.335498540224, -0.45195840154088],
[49.335581004388, -0.41484997241071],
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[49.286245922952, -0.16966058718734],
[49.289141316114, -0.14189309791495],
[49.2976014263, -0.099599544001567],
[49.297906717769, -0.087163331120361],
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[49.321204345512, -0.013370009201545],
[49.327780217617, 0.0040210484147169],
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[49.410111989975, 0.15940920759597],
[49.412357210559, 0.17578564453162],
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[49.607863429808, -1.228866448748],
[49.612658345594, -1.2542854436666],
[49.592845791028, -1.2662660112701],
[49.586657015411, -1.2612384503723],
[49.581953814631, -1.267613440608],
[49.587252068376, -1.2840568870782],
[49.583173183623, -1.2962280470313],
[49.573677338992, -1.3042001777054],
[49.552609580003, -1.3091731760214],
[49.538928237908, -1.3063595679898],
[49.51798179534, -1.2895246997246],
[49.500541701878, -1.2699260332883],
[49.48641032582, -1.2583845422005],
[49.455809055808, -1.2233382850858],
[49.424017594444, -1.182532110005],
[49.408031770721, -1.1679979463415],
[49.39174984514, -1.1617337685799],
[49.37843798982, -1.1732751083089],
[49.36489675323, -1.1775396285395],
[49.366660471267, -1.1639466580138],
[49.358414252281, -1.1388379041632],
[49.354043408557, -1.1360493392017],
[49.355568981262, -1.1196198636379]]
Une carte de la Normandie, avec le méridien de Greenwich
carte4 = folium.Map(location=[49.179, -0.382], zoom_start=8)
#limite régionale
route = folium.Polygon(normandie,tooltip = "normandie", color='green', fill = True).add_to(carte4)
#outil d'affichage des coordonnées des lieux cliqués
carte4.add_child(folium.LatLngPopup())
#méridien de Greenwich
meridien = folium.PolyLine(
[[48.3,0],[49.35,0]],
tooltip = "méridien de Greenwich",
color='red', dash_array="5 7" # trait pointillé rouge
).add_to(carte4)
carte4