[4] [5] Space-time cube Hägerstraand [6] 3 2 [7] Space-time cube Bach Space-time cube 2 2 Generalized space-time cube [8] Bach 3 Space-time cube 2 Sma

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1 1,a) 2 3,b) 1 1. Small multiples[1] Small multiples 1 College of Media Arts, Science and Technology, School of Informatics, University of Tsukuba 2 Dentsu Isobar Inc. 3 Faculty of Engineering, Information and Systems, University of Tsukuba a) chiba@vislab.cs.tsukuba.ac.jp b) misue@cs.tsukuba.ac.jp Andrienko [2] [3] Small multiples[1] c 2016 Information Processing Society of Japan 1

2 [4] [5] Space-time cube Hägerstraand [6] 3 2 [7] Space-time cube Bach Space-time cube 2 2 Generalized space-time cube [8] Bach 3 Space-time cube 2 Small multiples Time juxtaposing Time juxtaposing Small multiples Small multiples Time juxtaposing 2.2 Time juxtaposing GUI [9] Time juxtaposing 1 X MP Time juxtaposing HP [10] Time juxtaposing Fig. 1 Example of the use of time juxtaposing L *1 N lon N lat s x,y S S = {s x,y 0 x < N lon 0 y < N lat, L = s S s = N lon 1 x=0 N lat 1 y=0 x, y } (1) s x,y (2) x v y w s x,y s v,w = (3) s t u t (s) u t (s) R 0 R 0 t T N t s u(s) u(s) = (u 0 (s), u 1 (s),..., u Nt 1(s)) (4) 3.2 *1 c 2016 Information Processing Society of Japan 2

3 情報処理学会研究報告 かし 地図上で可視化することにより 内側すべての位置 の値が特定の範囲に収まるような部分空間を 1 つのまとま りとして認識することができ その地理空間上での動きや 形状の変化を追跡することができる このように 時空間 変量において空間的変化の情報はデータ内に直接記述され た情報ではなく 高次な情報である そのため 可視化表 現による読み取りもしくは空間的変化の抽出を目的とした 何らかのデータ処理が必要である 空間的変化の種類には クラスタの形状変化 移動 と 値のピーク地点の移動 の 2 つが考えられる クラスタの形状変化 移動 ある領域 s S と その領域に隣接する領域 s S を 考える それらの領域が時刻 t に持つ値 ut (s) と ut (s ) に 図 2 降雨強度データを提案手法を用いて可視化した図 ついて ut (s) ε かつ ut (s ) ε を満たす領域 s と s の Fig. 2 Example of the use of the proposed method 組み合わせが存在する ここで ε はしきい値である この とき 条件を満たす領域 s と s の組合せを足し合わせてで きる連続した領域をクラスタと呼ぶこととする 気象レー ダーのデータであれば それぞれのクラスタが雨雲を表現 していると言える クラスタの形状変化や移動は それを一意に記述するこ とはできない 可視化手法の読み手によって様々に解釈さ れる クラスタは時刻の経過に伴って その形が変化した り移動したりする 形の変化には 大きさの変化や分離と 合流などが考えられる 図 3 時空間変量データから Time juxtaposing への変換 Fig. 3 Conversion to time juxtaposing from the spatiotemporal variables 値のピーク地点の移動 クラスタ内のある 2 つの領域 s S と s S を考える それらの領域が時刻 t に持つ値 ut (s) と ut (s ) について 常に ut (s) ut (s ) を満たす領域 s が存在する この極大 値をとる地点を値のピーク地点と呼ぶこととする 値のピーク地点は 時空間変量データを理解する上で目 印となる情報である 例えば気象レーダーのデータであれ ば 値のピーク地点は雨雲の中心と言える 気象レーダー のデータを読み取った結果を他人に伝えるときには 雨雲 図 4 時空間変量データから提案手法への変換 Fig. 4 Conversion to the proposed method from the spatiotemporal variables の中心がどのように移動したかを伝えることで他人にデー タを理解してもらえるであろう 値のピーク地点の移動に 位置に配置する手法である それに対し 提案手法ではま は 移動の速さや軌跡の形状などの違いで様々なパターン ず図 4 のように地理空間を格子状に区切って部分空間を作 が考えられる る 図 4 左図に赤色で示したのはそのうちのある部分空間 4. 提案手法 我々は空間的変化の読み取りに関する問題を解決するた 内のデータ全時刻分であり これを 2 次元のチャートに要 約してその場に配置する チャートは簡単なものにして表 示領域を抑え 地理空間はそれに合わせて細かく区切る め 時空間変量データを単一地図上で表現する可視化手法 こうすることにより データを表現する位置とデータを持 を開発した 図 2 は 図 1 で示したものと同じデータを提 つ実際の位置とのズレを最小限にできるため 部分空間毎 案手法で可視化したものである にデータを要約して表現しても 地図全体として空間的な 情報の表現力を大きく損なうことはない 4.1 基本的なアイデア 部分空間を要約するチャートには 全時刻分の情報を失 図 3 左図に赤色で示した平面をある時刻のデータのプ いにくい より簡単な表現であることが求められる チャー ロットだとすると 既存手法の Time juxtaposing はそれ トへの要約は 位置に基づくデータの集約と 集約後の を抜き出して表示領域に合うよう縮小し 時刻順で適当な データに対する視覚変数の割当の 2 つの手順で行う c 2016 Information Processing Society of Japan 3

4 Time juxtaposing Fig. 5 5 Allocation and the legend of the visual variables 4.2 L N lon N lat i j A p,q A p,q S A p,q = {s x,y S pi x < (p + 1)i qj y < (q + 1)j} (5) A S t u t (A) u t (A) = 1 A u t (s) (6) s A A u(a) u(a) = (u 0 (A), u 1 (A),..., u Nt 1(A)) (7) 4.3 A p,q u(a) 5 1 N t 1 t u t (A) t u t (A) A p,q c 2016 Information Processing Society of Japan 4

5 1 1 Table 1 Features of the data used in User Study 1 D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 Y t Table 2 Durations of reading [sec.] and results of t-test for each data set x s d x s d p D D * D D * D D * D D * D D * * 5.4 EIZO ColorEdge CG Processing Enter [ ] 1 6 px t p < 0.05 p = t 2 * p < D8 D8 6 D D8 D5 Fig. 6 D8 presented with Fig. 7 D5 presented with the proposal method time juxtaposing 2 D5 D t D8 5.6 c 2016 Information Processing Society of Japan 5

6 2 5.2 D Q1 Q2 Q3 Q4 Q5 Q6 Q7 Q8 A B A B Table 3 Details of the questions in User Study 2 Q1 5 Q2 5 Q3 5 Q4 5 Q5 5 Q6 10 Q7 AB 10 Q8 AB 10 T1 T2 T3 T4 T5 4 2 Table 4 Types of the data used in User Study Q c 2016 Information Processing Society of Japan 6

7 5 Q1 3 Table 5 Results of the grading of the answers for Q1-3 T1 T2 T3 T4 T5 Q Q Q Table Q4 5 Deviations between the correct values and the answers for Q4 and Q5 [hour(s)] T1 T2 T3 T4 T5 Q Q Q6 8 Table 7 Numbers of the correct answers for Q6-8 x s d x s d Q *** Q * Q * Enter 3 12 Enter Q Q Q x s d Q p < p < 0.05 Q6 8 2 p < * p < 0.05 *** p < Q1 Q8 Q2 Q3 Q6 Q1 T5 1 T5 c 2016 Information Processing Society of Japan 7

8 Q5 Q8 Q5 Q8 Q5 Q8 Q5 Q4 Q7 Q5 Q8 Q1 [1] Tufte, E.: Envisioning Information, Graphics Press, Cheshire, CT, USA (1990). [2] Andrienko, G., Andrienko, N., Demsar, U., Dransch, D., Dykes, J., Fabrikant, S. I., Jern, M., Kraak, M.-J., Schumann, H. and Tominski, C.: Space, time and visual analytics, International Journal of Geographical Information Science, Vol. 24, No. 10, pp (2010). [3] Kraak, M.-J.: Geovisualization illustrated, ISPRS journal of photogrammetry and remote sensing, Vol. 57, No. 5, pp (2003). [4] Harrower, M.: A look at the history and future of animated maps, Cartographica: The International Journal for Geographic Information and Geovisualization, Vol. 39, No. 3, pp (2004). [5] Harrower, M. and Fabrikant, S.: The role of map animation for geographic visualization, Geographic visualization, pp (2008). [6] Hägerstraand, T.: What about people in regional science?, Papers in regional science, Vol. 24, No. 1, pp (1970). [7] Kraak, M.-J.: The space-time cube revisited from a geovisualization perspective, Proceedings of 21st International Cartographic Conference, pp (2003). [8] Bach, B., Dragicevic, P., Archambault, D., Hurter, C. and Carpendale, S.: A Descriptive Framework for Temporal Data Visualizations Based on Generalized Space- Time Cubes, Computer Graphics Forum, Wiley Online Library (2016). [9] Quinan, P. S. and Meyer, M.: Visually Comparing Weather Features in Forecasts, IEEE Transactions on Visualization and Computer Graphics, Vol. 22, No. 1, pp (2016). [10] :, (online), available from hpcolor.html (accessed ) c 2016 Information Processing Society of Japan 8

3.1 Thalmic Lab Myo * Bluetooth PC Myo 8 RMS RMS t RMS(t) i (i = 1, 2,, 8) 8 SVM libsvm *2 ν-svm 1 Myo 2 8 RMS 3.2 Myo (Root

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