質問: 行政界データ(シェープファイル形式)UTM座標系(日本測地系 54帯): ●大正・昭和期行政界データを 長崎> Nagasaki.shpをNagasaki.geojson に変換したのですが、 緯度経度が例えば下記のように [-87.----,30.----] のようになっているのが、現在の緯度経度では、 北緯34度、東経129度の辺だと思うのですが、 もし、現在の緯度経度に直したい場合はどうしたらいいのでしょうか? ご助言頂けたら助かります。 ``` { "type": "Feature", "properties": { "DUMMY": 1, "KYUSYU1ID": 1, "市町村": "豊崎村", "所属": "上県郡", "都道府県": "長崎県", "地方": "九州地方", "ポリゴンID": 11500 }, "geometry": { "type": "Polygon", "coordinates": [ [ [ -87.413577, 30.500782 ], [ -87.413576, 30.500786 ], [ -87.413577, 30.500787 ], [ -87.413571, 30.500795 ], [ -87.413564, 30.500799 ], [ -87.413561, 30.500802 ], [ -87.413554, 30.500805 ], [ -87.413554, 30.500795 ], [ -87.413553, 30.500791 ], [ -87.413546, 30.500795 ], [ -87.413543, 30.500796 ], [ -87.413537, 30.500798 ], [ -87.413535, 30.500793 ], [ -87.413533, 30.50079 ], [ -87.413528, 30.500785 ], [ -87.413521, 30.500785 ], [ -87.413519, 30.50078 ], [ -87.413516, 30.500775 ], [ -87.41352, 30.500772 ], [ -87.413525, 30.500765 ], [ -87.413528, 30.500756 ], [ -87.413524, 30.500758 ], [ -87.413519, 30.500762 ], [ -87.413512, 30.500761 ], [ -87.413516, 30.500756 ], [ -87.413519, 30.500749 ], [ -87.413518, 30.500742 ], [ -87.413527, 30.500738 ], [ -87.413531, 30.500735 ], [ -87.413536, 30.500735 ], [ -87.413545, 30.50074 ], [ -87.413545, 30.500736 ], [ -87.413541, 30.500731 ], [ -87.413537, 30.500726 ], [ -87.413533, 30.500721 ], [ -87.413537, 30.500719 ], [ -87.413543, 30.500715 ], [ -87.413548, 30.500712 ], [ -87.413555, 30.500711 ], [ -87.413559, 30.500708 ], [ -87.413562, 30.500698 ], [ -87.413563, 30.500695 ], [ -87.413569, 30.500699 ], [ -87.413575, 30.500705 ], [ -87.413577, 30.500714 ], [ -87.41358, 30.500718 ], [ -87.413581, 30.50071 ], [ -87.41358, 30.500702 ], [ -87.413589, 30.50071 ], [ -87.413591, 30.500715 ], [ -87.413595, 30.50072 ], [ -87.413591, 30.500722 ], [ -87.413586, 30.500727 ], [ -87.413581, 30.500736 ], [ -87.413579, 30.500744 ], [ -87.413578, 30.500749 ], [ -87.413576, 30.500753 ], [ -87.413574, 30.50076 ], [ -87.413573, 30.500764 ], [ -87.413576, 30.500771 ], [ -87.413577, 30.500779 ], [ -87.413577, 30.500782 ] ] ] } }, ```
回答: ユニバーサル横メルカトル図法 - UTM 座標 (E, N, Zone, Hemi) から経緯度 (φ, λ) への換算 (wikipedia) と思ったんですが、それ本当にUTM座標ですか?