64 lines
3.3 KiB
HTML
64 lines
3.3 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<html>
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<head>
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<meta http-equiv="CONTENT-TYPE" content="text/html; charset=utf-8">
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<title>Align_Grids</title>
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<meta name="GENERATOR" content="OpenOffice.org 1.1.3 (Linux)">
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<meta name="CREATED" content="19951121;16410000">
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<meta name="CHANGED" content="20050706;13040400">
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<style>
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@page { size: 8.5in 11in; margin-right: 1.25in; margin-top: 1in; margin-bottom: 1in }
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P { margin-bottom: 0.08in; direction: ltr; color: #000000; text-align: left; widows: 0; orphans: 0 }
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P.western { font-family: "Bitstream Vera Serif", "Times New Roman", serif; font-size: 12pt; so-language: en-US }
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P.cjk { font-family: "Bitstream Vera Sans"; font-size: 12pt; so-language: }
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P.ctl { font-family: "Lucidasans"; font-size: 12pt; so-language: }
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-->
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</style>
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</head>
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<body dir="ltr" lang="de-DE" text="#000000">
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<font face="New Century Schoolbook, Times New Roman, serif"><font
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size="5"><b>Align_Grids</b></font></font>
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<br>
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<br>
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<font face="New Century Schoolbook, Times New Roman, serif"><font
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size="3"><b>Overview</b></font></font>
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<br>
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<br>
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<font face="New Century Schoolbook, Times New Roman, serif">This procedure will align the time
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breaks of selected weather elements to match the time breaks of the individual grids of a "source"
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element. The main idea is to help minimize manual splitting and stretching of grids in the Grid
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Manager. If a grid to align does not exist, then it will be created from scratch. Therefore one
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use of this procedure could be to create default SnowAmt grids that match the time breaks of QPF
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grids. In general, you will want to edit the source element first creating the desired time breaks
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and then run this procedure to align other elements before editing them. For example, edit Wx,
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then run Align_Grids to line up the floating PoP grids with the Wx grids, then edit PoP.
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<br><br>
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The data from an element's original time breaks are transformed to the new time breaks using the
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following methods:
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<ul>
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<li><b>Wx:</b> "MaxTime" - uses original grid with the dominant temporal coverage in the new
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aligned time range.</li>
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<li><b>PoP:</b> "Max" - Maximum value of all original grids in the new time range of the
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aligned grid.</li>
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<li><b>Sky:</b> "Max" - Maximum value of all original grids in the new time range of the
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aligned grid.</li>
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<li><b>WindGust:</b> "Max" - Maximum value of all original grids in the new time range of the
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aligned grid. NOTE: WindGust is always aligned to Wind grids.</li>
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<li><b>Wind:</b> "TimeWtAverage" - Time weighted average value</li>
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<li><b>QPF:</b> "Sum" - Summation of all grids</li>
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<li><b>SnowAmt:</b> "Sum" - Summation of all grids</li>
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<li>IceAccum: "Sum, - Summation of all grids</li>
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</ul><br>
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The logic for the procedure is as follows:<br>
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<ol>
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<li>The procedure first copies the element to align to a temporary element.</li>
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<li>New grids for the element to align are created from scratch to match the
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time breaks of the source element's grids.</li>
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<li>The grids in the temporary element are either fragmented (for rate based elements)
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or split to match the time breaks of the source element.</li>
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<li>Finally, the values in the temporary grids are assigned back to the aligned grids '
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using the getGrids method with the appropriate setting of the getGrids "mode" argument.</li>
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</ol></body>
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</html>
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