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--- kvalobs:kvoss:system:qc2:test:algorithms:akima [2011-03-26 18:40:23]
paule
+++ kvalobs:kvoss:system:qc2:test:algorithms:akima [2022-05-31 09:29:32] (current)
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 The following graphs illustrate comparisons between an Akima Interpolation and Linear Interpolation for single missing points. The title gives the time of the missing value, which is located at Hours=3 on each graph. The linear interpolation is the square on the straight line segment. The real data are displayed as blue squares. The curve is the Akima Spline and the corrected value that would be provided by the Akima Interpolation is indicated by the triangle.
-{{:kvoss:system:qc2:test:algorithms:o2.dat.jpg|}}
+{{kvalobs:kvoss:system:qc2:test:algorithms:o2.dat.jpg|}}
-{{:kvoss:system:qc2:test:algorithms:o3.dat.jpg|}}
+{{kvalobs:kvoss:system:qc2:test:algorithms:o3.dat.jpg|}}
-{{:kvoss:system:qc2:test:algorithms:o4.dat.jpg|}}
+{{kvalobs:kvoss:system:qc2:test:algorithms:o4.dat.jpg|}}
-{{:kvoss:system:qc2:test:algorithms:o5.dat.jpg|}}
+{{kvalobs:kvoss:system:qc2:test:algorithms:o5.dat.jpg|}}
 ====== StationID = 59800; Start Time=20080706-06 ======
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 ^Curve: |The Akima Fit |
-{{:kvoss:system:qc2:test:algorithms:ALL.jpg?300x300|}}
+{{kvalobs:kvoss:system:qc2:test:algorithms:ALL.jpg?300x300|}}
-{{:kvoss:system:qc2:test:algorithms:8_12.jpg?300x300|}}
+{{kvalobs:kvoss:system:qc2:test:algorithms:8_12.jpg?300x300|}}
-{{:kvoss:system:qc2:test:algorithms:3_5.jpg?300x300|}}
+{{kvalobs:kvoss:system:qc2:test:algorithms:3_5.jpg?300x300|}}
-{{:kvoss:system:qc2:test:algorithms:2_3.jpg?300x300|}}
+{{kvalobs:kvoss:system:qc2:test:algorithms:2_3.jpg?300x300|}}
-{{:kvoss:system:qc2:test:algorithms:3_2.jpg?300x300|}}
+{{kvalobs:kvoss:system:qc2:test:algorithms:3_2.jpg?300x300|}}
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    * Actual original = 10.1 Degrees Celsius
-   * {{:kvoss:system:qc2:test:algorithms:18700-a_all.jpg|}}
+   * {{kvalobs:kvoss:system:qc2:test:algorithms:18700-a_all.jpg|}}
-   * {{:kvoss:system:qc2:test:algorithms:18700-a.jpg|}}
+   * {{kvalobs:kvoss:system:qc2:test:algorithms:18700-a.jpg|}}
-   * {{:kvoss:system:qc2:test:algorithms:18700-a_8_2.jpg|}}
+   * {{kvalobs:kvoss:system:qc2:test:algorithms:18700-a_8_2.jpg|}}
    * Square below is the linear interpolation:
-   * {{:kvoss:system:qc2:test:algorithms:18700-a_3_2_l.jpg|}}
+   * {{kvalobs:kvoss:system:qc2:test:algorithms:18700-a_3_2_l.jpg|}}
 ====== StationID = 18700; Start Time=20080706-06; Example 2 ======
-   * {{:kvoss:system:qc2:test:algorithms:18700-b_all.jpg|}}
+   * {{kvalobs:kvoss:system:qc2:test:algorithms:18700-b_all.jpg|}}
-   * {{:kvoss:system:qc2:test:algorithms:18700-b_4_4.jpg|}}
+   * {{kvalobs:kvoss:system:qc2:test:algorithms:18700-b_4_4.jpg|}}
-   * {{:kvoss:system:qc2:test:algorithms:18700-b_2_3.jpg|}}
+   * {{kvalobs:kvoss:system:qc2:test:algorithms:18700-b_2_3.jpg|}}
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 (3 rows)
 </code>
+The case is even more interesting. Qc1 identifies a Dip at Hour=17:00 where the value is 11.8. If one ignores the points at Hours 16 and 18 then 11.8 doe snot look like a Dip.
+{{kvalobs:kvoss:system:qc2:test:algorithms:o6.dat.jpg|}}
 <code>