移動時間と移動距離
車で移動する際の距離と時間を推定する.
2つの異なる都市の間を移動する.
In[1]:=
![Click for copyable input](assets.ja/travel-time-and-distance/In_42.png)
cities = {Entity["City", {"Lisbon", "Lisboa", "Portugal"}],
Entity["City", {"Beijing", "Beijing", "China"}]};
両都市間の測地距離である.
In[2]:=
![Click for copyable input](assets.ja/travel-time-and-distance/In_43.png)
GeoDistance[cities]
Out[2]=
![](assets.ja/travel-time-and-distance/O_32.png)
次は車で移動する場合の距離である.
In[3]:=
![Click for copyable input](assets.ja/travel-time-and-distance/In_44.png)
TravelDistance[cities]
Out[3]=
![](assets.ja/travel-time-and-distance/O_33.png)
休憩を挟まずに運転し続けた場合の推定運転時間である.
In[4]:=
![Click for copyable input](assets.ja/travel-time-and-distance/In_45.png)
TravelTime[cities]
Out[4]=
![](assets.ja/travel-time-and-distance/O_34.png)
このオブジェクトには,実際の移動経路が含まれている.
In[5]:=
![Click for copyable input](assets.ja/travel-time-and-distance/In_46.png)
td = TravelDirections[{Entity[
"City", {"Lisbon", "Lisboa", "Portugal"}],
Entity["City", {"Beijing", "Beijing", "China"}]}]
Out[5]=
![](assets.ja/travel-time-and-distance/O_35.png)
メルカトル図法の地図上に軌道(赤)を描き,測地軌道(青)と比較する.先ほどの例でも見たように,後者の方が短い.
In[6]:=
![Click for copyable input](assets.ja/travel-time-and-distance/In_47.png)
GeoGraphics[{Thick, Red, GeoPath[td], Blue,
GeoPath[{Entity["City", {"Lisbon", "Lisboa", "Portugal"}],
Entity["City", {"Beijing", "Beijing", "China"}]}]},
GeoProjection -> "Mercator", GeoGridLines -> Automatic]
Out[6]=
![](assets.ja/travel-time-and-distance/O_36.png)
方位図法では,測地経路の方が移動経路よりも短いことがもっとはっきり分かる.
In[7]:=
![Click for copyable input](assets.ja/travel-time-and-distance/In_48.png)
GeoGraphics[{Thick, Red, GeoPath[td], Blue,
GeoPath[{Entity["City", {"Lisbon", "Lisboa", "Portugal"}],
Entity["City", {"Beijing", "Beijing", "China"}]}]},
GeoProjection -> "Mercator", GeoGridLines -> Automatic];
Show[%, GeoProjection -> "LambertAzimuthal", GeoZoomLevel -> 4]
Out[7]=
![](assets.ja/travel-time-and-distance/O_37.png)