<para>Returns the width of a pixel in geometric units of the spatial reference system. In the common case where
there is no skew, the pixel width is just the scale ratio between geometric coordinates and raster pixels.</para>
<para>The following diagram demonstrates the relationship:</para>
+ <para>
<informalfigure>
<mediaobject>
<imageobject>
<caption><para>Pixel Width: Pixel size in the i direction</para><para>Pixel Height: Pixel size in the j direction</para></caption>
</mediaobject>
</informalfigure>
+ </para>
</refsection>
<refsection>
<tgroup cols="3">
<tbody>
<row>
- <entry><informalfigure>
+ <entry><para><informalfigure>
<mediaobject>
<imageobject>
<imagedata fileref="images/rt_st_transform01.png" />
</imageobject>
<caption><para>original mass state plane meters (mass_stm)</para></caption>
</mediaobject>
- </informalfigure>
+ </informalfigure></para>
</entry>
- <entry><informalfigure>
+ <entry><para><informalfigure>
<mediaobject>
<imageobject>
<imagedata fileref="images/rt_st_transform02.png" />
</imageobject>
<caption><para>After transform to wgs 84 long lat (wgs_84)</para></caption>
</mediaobject>
- </informalfigure>
+ </informalfigure></para>
</entry>
- <entry><informalfigure>
+ <entry><para><informalfigure>
<mediaobject>
<imageobject>
<imagedata fileref="images/rt_st_transform03.png" />
</imageobject>
<caption><para>After transform to wgs 84 long lat with bilinear algorithm instead of NN default (wgs_84_bilin)</para></caption>
</mediaobject>
- </informalfigure>
+ </informalfigure></para>
</entry>
</row>
</tbody>
<tgroup cols="2">
<tbody>
<row>
- <entry><informalfigure>
+ <entry><para><informalfigure>
<mediaobject>
<imageobject>
<imagedata fileref="images/st_clip01.png" />
</imageobject>
<caption><para>Full raster tile before clipping</para></caption>
</mediaobject>
- </informalfigure>
+ </informalfigure></para>
</entry>
- <entry><informalfigure>
+ <entry><para><informalfigure>
<mediaobject>
<imageobject>
<imagedata fileref="images/st_clip02.png" />
</imageobject>
<caption><para>After Clipping</para></caption>
</mediaobject>
- </informalfigure>
+ </informalfigure></para>
</entry>
</row>
</tbody>
<tgroup cols="2">
<tbody>
<row>
- <entry><informalfigure>
+ <entry><para><informalfigure>
<mediaobject>
<imageobject>
<imagedata fileref="images/st_clip01.png" />
</imageobject>
<caption><para>Full raster tile before clipping</para></caption>
</mediaobject>
- </informalfigure>
+ </informalfigure></para>
</entry>
- <entry><informalfigure>
+ <entry><para><informalfigure>
<mediaobject>
<imageobject>
<imagedata fileref="images/st_clip03.png" />
</imageobject>
<caption><para>After Clipping</para></caption>
</mediaobject>
- </informalfigure>
+ </informalfigure></para>
</entry>
</row>
</tbody>
<tgroup cols="2">
<tbody>
<row>
- <entry><informalfigure>
+ <entry><para><informalfigure>
<mediaobject>
<imageobject>
<imagedata fileref="images/st_mapalgebraexpr01.png" />
</imageobject>
<caption><para>original (column rast-view)</para></caption>
</mediaobject>
- </informalfigure>
+ </informalfigure></para>
</entry>
- <entry><informalfigure>
+ <entry><para><informalfigure>
<mediaobject>
<imageobject>
<imagedata fileref="images/st_mapalgebraexpr02.png" />
</imageobject>
<caption><para>rast_view_ma</para></caption>
</mediaobject>
- </informalfigure>
+ </informalfigure></para>
</entry>
</row>
</tbody>
<tgroup cols="2">
<tbody>
<row>
- <entry><informalfigure>
+ <entry><para><informalfigure>
<mediaobject>
<imageobject>
<imagedata fileref="images/st_mapalgebraexpr2_01.png" />
</imageobject>
<caption><para>mapalgebra intersection</para></caption>
</mediaobject>
- </informalfigure>
+ </informalfigure></para>
</entry>
- <entry><informalfigure>
+ <entry><para><informalfigure>
<mediaobject>
<imageobject>
<imagedata fileref="images/st_mapalgebraexpr2_02.png" />
</imageobject>
<caption><para>map algebra union</para></caption>
</mediaobject>
- </informalfigure>
+ </informalfigure></para>
</entry>
</row>
</tbody>
<tgroup cols="2">
<tbody>
<row>
- <entry><informalfigure>
+ <entry><para><informalfigure>
<mediaobject>
<imageobject>
<imagedata fileref="images/st_mapalgebraexpr2_04.png" />
</imageobject>
<caption><para>rast1</para></caption>
</mediaobject>
- </informalfigure>
+ </informalfigure></para>
</entry>
- <entry><informalfigure>
+ <entry><para><informalfigure>
<mediaobject>
<imageobject>
<imagedata fileref="images/st_mapalgebraexpr2_05.png" />
</imageobject>
<caption><para>rast2</para></caption>
</mediaobject>
- </informalfigure>
+ </informalfigure></para>
</entry>
</row>
<row>
- <entry><informalfigure>
+ <entry><para><informalfigure>
<mediaobject>
<imageobject>
<imagedata fileref="images/st_mapalgebraexpr2_06.png" />
</imageobject>
<caption><para>rast3</para></caption>
</mediaobject>
- </informalfigure>
+ </informalfigure></para>
</entry>
- <entry><informalfigure>
+ <entry><para><informalfigure>
<mediaobject>
<imageobject>
<imagedata fileref="images/st_mapalgebraexpr2_07.png" />
</imageobject>
<caption><para>final_rast</para></caption>
</mediaobject>
- </informalfigure>
+ </informalfigure></para>
</entry>
</row>
</tbody>
<tgroup cols="1">
<tbody>
<row>
- <entry><informalfigure>
+ <entry><para><informalfigure>
<mediaobject>
<imageobject>
<imagedata fileref="images/st_mapalgebraexpr2_08.png" />
</imageobject>
<caption><para>The blue lines are the boundaries of select parcels</para></caption>
</mediaobject>
- </informalfigure>
+ </informalfigure></para>
</entry>
</row>
</tbody>
<tgroup cols="2">
<tbody>
<row>
- <entry><informalfigure>
+ <entry><para><informalfigure>
<mediaobject>
<imageobject>
<imagedata fileref="images/st_mapalgebraexpr01.png" />
</imageobject>
<caption><para>original (column rast-view)</para></caption>
</mediaobject>
- </informalfigure></entry>
- <entry><informalfigure>
+ </informalfigure></para></entry>
+ <entry><para><informalfigure>
<mediaobject>
<imageobject>
<imagedata fileref="images/st_mapalgebraexpr02.png" />
</imageobject>
<caption><para>rast_view_ma</para></caption>
</mediaobject>
- </informalfigure></entry>
+ </informalfigure></para></entry>
</row>
</tbody>
</tgroup>
<tgroup cols="1">
<tbody>
<row>
- <entry><informalfigure>
+ <entry><para><informalfigure>
<mediaobject>
<imageobject>
<imagedata fileref="images/st_mapalgebrafct2_01.png" />
</imageobject>
<caption><para>map bands overlay (canvas) (R: small road, G: circle, B: big road)</para></caption>
</mediaobject>
- </informalfigure>
+ </informalfigure></para>
</entry>
</row>
</tbody>
FROM map_shapes As m1
WHERE m1.descrip = 'map bands overlay fct union (canvas)';
</programlisting>
+ <para>
<informalfigure>
<mediaobject>
<imageobject>
<caption><para>user defined with extra args and different bands from same raster</para></caption>
</mediaobject>
</informalfigure>
+ </para>
</refsection>
<tgroup cols="2">
<tbody>
<row>
- <entry><informalfigure>
+ <entry><para><informalfigure>
<mediaobject>
<imageobject>
<imagedata fileref="images/st_mapalgebrafctngb01.png" />
</imageobject>
<caption><para>First band of our raster</para></caption>
</mediaobject>
- </informalfigure></entry>
- <entry><informalfigure>
+ </informalfigure></para></entry>
+ <entry><para><informalfigure>
<mediaobject>
<imageobject>
<imagedata fileref="images/st_mapalgebrafctngb02.png" />
</imageobject>
<caption><para>new raster after averaging pixels withing 4x4 pixels of each other</para></caption>
</mediaobject>
- </informalfigure></entry>
+ </informalfigure></para></entry>
</row>
</tbody>
</tgroup>