73 lines
3.7 KiB
HTML
73 lines
3.7 KiB
HTML
<!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>RemoveWx</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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<!--
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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>RemoveWx</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>Introduction</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">Sometimes you have complex combinations
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of weather and you want to remove just one of the “pieces” of weather. It is difficult to do using
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the standard Assign_Value dialog for weather, without messing up other weather combinations, or
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having to do the operation multiple times for each different combination of weather. The RemoveWx
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tool makes it easy to remove a particular weather string from any area of weather.</font>
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<br>
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<br>
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<br>
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<big><big><font style="font-weight: bold;"
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face="New Century Schoolbook, Times New Roman, serif">How
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the Procedure Works</font><span style="font-weight: bold;">
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</span></big></big><br>
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<br>
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<font face="New Century Schoolbook, Times New Roman, serif">Lets say we have a complex combination
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of rain/snow (with different probability values) and we have patchy fog combined with both of these
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weather types:<br><br>
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<img alt="RemoveWx" src="images/RemoveWx.png"></font>
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<br>
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<br>
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<font face="New Century Schoolbook, Times New Roman, serif">Now, lets say that we want to remove
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the fog. If we do a query to find all the pixels that contain fog, we cannot simply set the
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values to rain, because we have the fog combined with rain in some areas and snow in others
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(not to mention that we have it combined with ‘chance rain/snow’ in some areas and ‘likely
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rain/snow’ in others). If we use the ‘select homogeneous area’ tool we will have to do this
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several times to find all the areas of fog combined with other things. When we start the RemoveWx
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tool, it presents a dialog where we specify which weather we want to remove:<br>
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<img alt="RemoveWx" src="images/RemoveWx1.png"></font>
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<br>
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<br>
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<font face="New Century Schoolbook, Times New Roman, serif">We just need to select F for Fog:<br>
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<img alt="RemoveWx" src="images/RemoveWx2.png"></font>
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<br>
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<br>
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<font face="New Century Schoolbook, Times New Roman, serif">Then run the tool, and all mention of
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Fog is removed, while preserving all the other weather combinations:<br>
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<img alt=RemoveWx" src="images/RemoveWx3.png"><br><br>
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The tool also works if you specify an edit area, so that, for example, you could remove fog from
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only some areas, while leaving it in others. Say, for example, that you define an edit area like
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this:<br>
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<img alt="RemoveWx" src="images/RemoveWx4.png"><br><br>
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And then remove the fog. The result is:<br>
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<img alt="RemoveWx" src="images/RemoveWx5.png"><br><br>
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There are many cases where you want to do this sort of editing operation: removing thunderstorms from
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an area of showers, removing freezing rain from an area of rain, etc.</font>
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</body>
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</html>
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