linke turbidity resolution should be 1/12 of an arcdegree #263
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mikofski
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Nov 15, 2016
* set minimum index as 0 not 1 * adjust _linearly_scale so that is increments are 5 minutes or 1/12 of an arcdegree from the centers of neighboring indices * this fixes the out of bounds error for latitudes or longitudes at the limits of the range * move _linearly_scale to be right after lookup_linke_turbidity * add link to pdf on AOD and LT from MeteoTest * raise IndexError if outputmatrix is more than half an index outside of the limits Signed-off-by: Mark Mikofski <[email protected]>
wholmgren
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Nov 18, 2016
* fix #263 and #262 * set minimum index as 0 not 1 * adjust _linearly_scale so that is increments are 5 minutes or 1/12 of an arcdegree from the centers of neighboring indices * this fixes the out of bounds error for latitudes or longitudes at the limits of the range * move _linearly_scale to be right after lookup_linke_turbidity * add link to pdf on AOD and LT from MeteoTest * raise IndexError if outputmatrix is more than half an index outside of the limits Signed-off-by: Mark Mikofski <[email protected]> * unset debug logging Signed-off-by: Mark Mikofski <[email protected]> * remove logging and use pytest with raises context Signed-off-by: Mark Mikofski <[email protected]> * all test passing now Signed-off-by: Mark Mikofski <[email protected]> * fixes #265 * use calendar month days instead of approximation of monthly middles * also account for leap years * if all years are leap years, or not any are leap years, use fast interp, otherwise loop and interpolate each timestamp * add _leapyear tests and update expected values for new interpolated Linke turbidity factors Signed-off-by: Mark Mikofski <[email protected]> * update expected values for test_location.test_get_clearsky Signed-off-by: Mark Mikofski <[email protected]> * update test_modelchain.py with new expected values for PR #264 Signed-off-by: Mark Mikofski <[email protected]> * add (at)requires_scipy and update whatsnew v0.4.2 Signed-off-by: Mark Mikofski <[email protected]>
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The Linke turbidity should be 1/12 = 0.0833 of an arc degree or 5' (minutes of arc degrees) - see section 8 from "Aerosol optical depth and Linke turbidity climatology" and SoDa Pro: Linke Turbidity Factor, or the old SoDa Linke Turbidity and reference. Instead latitude is 180/2159 = 0.083372 and longitude is 360/4319 = 0.083353.
Section 8.1: Format of the data explains:
This indicates that each measurement is at the center of the node, not the edges. IE: the 1st node is not at 90° but (90° - 1/24°) = 89.9583°.
The values of TL at points for any latitude along the longitude -180° and +180° don't match, and therefore indicate that they are not the same.
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