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QGISを用いたラスタデータ解析
Landsat 8画像からNDVI算出
自然環境学専攻 伊藤聡士
この作品はCC BY 4.0 ライセンス
の下に提供されています。
はじめに
• このスライドではCC BY 4.0 ライセンスに基づき
小池隆(合同会社緑IT事務所)
中村和彦・福本塁(NPO法人オープンコンシェ
ルジュ)
岩田 敏彰(独立行政法人 産業技術研究所)
が作成した「Landsat8 画像でNDVI算出」を参考に
した。
(http://www.slideshare.net/openconcierge/landsat-
8ndvi)
NDVIとは
• 正規化差分植生指標
(Normalized Difference Vegetation Index; NDVI)
• 植生の量や活性を反映する指標
• NDVI = ( NIR – Red ) / ( NIR + Red )
NIR:近赤外 Red:赤
※参考サイト:とらりもんHOME
http://pen.agbi.tsukuba.ac.jp/~RStiger/hiki2/
Landsat 8 画像の選択
• 産総研のLandBrowserから
http://landbrowser.geogrid.org/landbrowser/
のページを開く
• 好きなエリアを選択する
画像の保存
②Display Menu
でcloudを10程
度にする
①拡大して保存
したいエリアを
表示する
画像の保存
③「Save」ボタンをクリック
④Band4(赤)とBand5(近赤外)をクリックして保存
画像の読み込み
・ QGIS を起動し、ラスタレイヤの追加から保存した
2つのファイルを選択する
NDVIの計算
・ ラスタメニューのラスタ計算機という項目を選択する
・ NDVI算出の計算式から ( Band5 - Band4 ) / ( Band5 + Band4 ) となるよ
うにラスタ演算式のところに入力
・ 保存先を選択して「ok」をクリック
色分けをする
・ 計算結果のレイヤを右クリックしてプロパティを開く
・ 単バンド疑似カラー、Greensを選択し、「分類」をクリック
・ 「適用」をクリックすると緑に色が変わる
完成した画像
・ 緑色が濃い所ほどNDVIの値が高いことを示す

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Qgisを用いたラスタデータ解析