「GRASSベクターレイヤのデジタイズと編集」の版間の差分

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(ページの作成: <H2> Digitizing and editing a GRASS vector layer </H2> <P> The digitizing tools for GRASS vector layers are accessed using the grass_editEdit GRASS vector layer icon on the tool…)
 
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<H2>
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--[[利用者:Sanak|Sanak]] 2009年10月4日 (日) 13:19 (UTC)このページは削除予定です。
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Digitizing and editing a GRASS vector layer
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</H2>
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<P>
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The digitizing tools for GRASS vector layers are accessed using the
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grass_editEdit GRASS vector layer icon on the toolbar. Make
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sure you have loaded a GRASS vector and it is the selected layer in the legend
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before clicking on the edit tool. Figure <A HREF="#fig:grass_digitizing_category">30</A>
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shows the GRASS edit dialog that is displayed when you click on the edit tool.
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The tools and settings are discussed in the following sections.
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<P>
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<BR>
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<IMG
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WIDTH="500" HEIGHT="11" ALIGN="BOTTOM" BORDER="0"
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SRC="img4.png"
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ALT="\begin{Tip}
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% latex2html id marker 267
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\caption{\textsc{Digitizing polygones in ...
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...mation of a polygon always to the centroid and not to the
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boundary.
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}
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\end{Tip}">
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<BR>
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<P>
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Toolbar<A NAME="label_grasstoolbar"></A>
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<P>
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In Figure <A HREF="#fig:grass_digitizing_toolbar">29</A> you see the GRASS digitizing
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toolbar icons provided by the GRASS plugin. Table <A HREF="#tab:grass_tools">3</A>
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explains the available functionalities.
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<P>
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<DIV ALIGN="CENTER"><A NAME="fig:grass_digitizing_toolbar"></A><A NAME="278"></A>
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<TABLE>
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<CAPTION ALIGN="BOTTOM"><STRONG>Figure:</STRONG>
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GRASS Digitizing Toolbar </CAPTION>
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<TR><TD>
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<DIV ALIGN="CENTER">
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  [clip=true,width=12cm]grass_digitizing_toolbar
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</DIV></TD></TR>
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</TABLE>
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</DIV>
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<P>
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<BR><P></P>
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<DIV ALIGN="CENTER">
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<A NAME="284"></A>
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<DIV ALIGN="CENTER">
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</DIV><A NAME="tab:grass_tools"></A><P>
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<BR>
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<A NAME="285"></A>
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<TABLE CELLPADDING=3 BORDER="1">
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<CAPTION><STRONG>Table 3:</STRONG>
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GRASS Digitizing Tools</CAPTION>
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<TR><TH ALIGN="LEFT"><SPAN  CLASS="textbf">Icon</SPAN></TH>
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<TH ALIGN="LEFT"><SPAN  CLASS="textbf">Tool</SPAN></TH>
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<TH ALIGN="LEFT" VALIGN="TOP" WIDTH=360><SPAN  CLASS="textbf">Purpose</SPAN></TH>
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</TR>
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<TR><TD ALIGN="LEFT">[width=0.7cm]grass_new_point</TD>
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<TD ALIGN="LEFT">New Point</TD>
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<TD ALIGN="LEFT" VALIGN="TOP" WIDTH=360>Digitize
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new point</TD>
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</TR>
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<TR><TD ALIGN="LEFT">[width=0.7cm]grass_new_line</TD>
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<TD ALIGN="LEFT">New Line</TD>
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<TD ALIGN="LEFT" VALIGN="TOP" WIDTH=360>Digitize
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new line (finish by selecting new tool)</TD>
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</TR>
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<TR><TD ALIGN="LEFT">[width=0.7cm]grass_new_boundary</TD>
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<TD ALIGN="LEFT">New Boundary</TD>
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<TD ALIGN="LEFT" VALIGN="TOP" WIDTH=360>Digitize new boundary (finish by selecting new tool)</TD>
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</TR>
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<TR><TD ALIGN="LEFT">[width=0.7cm]grass_new_centroid</TD>
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<TD ALIGN="LEFT">New Centroid</TD>
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<TD ALIGN="LEFT" VALIGN="TOP" WIDTH=360>Digitize new centroid (label existing area)</TD>
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</TR>
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<TR><TD ALIGN="LEFT">[width=0.7cm]grass_move_vertex</TD>
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<TD ALIGN="LEFT">Move vertex</TD>
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<TD ALIGN="LEFT" VALIGN="TOP" WIDTH=360>Move
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one vertex of existing line or boundary and identify new position</TD>
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</TR>
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<TR><TD ALIGN="LEFT">[width=0.7cm]grass_add_vertex</TD>
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<TD ALIGN="LEFT">Add vertex</TD>
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<TD ALIGN="LEFT" VALIGN="TOP" WIDTH=360>Add a
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new vertex to existing line</TD>
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</TR>
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<TR><TD ALIGN="LEFT">[width=0.7cm]grass_delete_vertex</TD>
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<TD ALIGN="LEFT">Delete vertex</TD>
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<TD ALIGN="LEFT" VALIGN="TOP" WIDTH=360>Delete vertex from existing line (confirm selected vertex by another click)</TD>
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</TR>
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<TR><TD ALIGN="LEFT">[width=0.7cm]grass_move_line</TD>
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<TD ALIGN="LEFT">Move element</TD>
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<TD ALIGN="LEFT" VALIGN="TOP" WIDTH=360>Move
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selected boundary, line, point or centroid and click on new position</TD>
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</TR>
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<TR><TD ALIGN="LEFT">[width=0.7cm]grass_split_line</TD>
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<TD ALIGN="LEFT">Split line</TD>
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<TD ALIGN="LEFT" VALIGN="TOP" WIDTH=360>Split
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an existing line to 2 parts</TD>
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</TR>
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<TR><TD ALIGN="LEFT">[width=0.7cm]grass_delete_line</TD>
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<TD ALIGN="LEFT">Delete element</TD>
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<TD ALIGN="LEFT" VALIGN="TOP" WIDTH=360>Delete existing boundary, line, point or centroid (confirm selected element by
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another click)</TD>
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</TR>
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<TR><TD ALIGN="LEFT">[width=0.7cm]grass_edit_attributes</TD>
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<TD ALIGN="LEFT">Edit attributes</TD>
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<TD ALIGN="LEFT" VALIGN="TOP" WIDTH=360>Edit attributes of selected element (note that one element can represent
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more features, see above)</TD>
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</TR>
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<TR><TD ALIGN="LEFT">[width=0.7cm]grass_close_edit</TD>
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<TD ALIGN="LEFT">Close</TD>
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<TD ALIGN="LEFT" VALIGN="TOP" WIDTH=360>Close
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session and save current status (rebuilds topology afterwards)</TD>
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</TR>
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</TABLE>
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</DIV>
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<BR>
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<P>
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Category Tab<A NAME="307"></A>
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<P>
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The Category tab allows you to define the way in which the category
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values will be assigned to a new geometry element.
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<P>
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<DIV ALIGN="CENTER"><A NAME="fig:grass_digitizing_category"></A><A NAME="311"></A>
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<TABLE>
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<CAPTION ALIGN="BOTTOM"><STRONG>Figure:</STRONG>
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GRASS Digitizing Category Tab </CAPTION>
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<TR><TD>
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<DIV ALIGN="CENTER">
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  [clip=true,width=10cm]grass_digitizing_category
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</DIV></TD></TR>
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</TABLE>
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</DIV>
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<P>
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<UL>
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<LI><SPAN  CLASS="textbf">Mode</SPAN>: what category value shall be applied to new geometry
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elements.
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<UL>
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<LI>Next not used - apply next not yet used category value to geometry
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element.
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</LI>
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<LI>Manual entry - manually define the category value for the geometry
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element in the 'Category'-entry field.
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</LI>
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<LI>No category - Do not apply a category value to the geometry element.
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This is e.g. used for area boundaries, because the category values are
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connected via the centroid.
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</LI>
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</UL>
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</LI>
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<LI><SPAN  CLASS="textbf">Category</SPAN> - A number (ID) is attached to each digitized geometry
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element. It is used to connect each geometry element with its attributes.
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</LI>
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<LI><SPAN  CLASS="textbf">Field (layer)</SPAN> - Each geometry element can be connected with
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several attribute tables using different GRASS geometry layers. Default layer
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number is 1.
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</LI>
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</UL>
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<P>
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<BR>
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<IMG
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WIDTH="251" HEIGHT="11" ALIGN="BOTTOM" BORDER="0"
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SRC="img5.png"
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ALT="\begin{Tip}
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% latex2html id marker 323
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\caption{\textsc{Creating an additional G...
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...Table tab
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you can create your new table connected to your new layer.
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}
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\end{Tip}">
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<BR>
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<P>
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Settings Tab<A NAME="label_settingtab"></A><A NAME="329"></A>
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<P>
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The Settings tab allows you to set the snapping in screen pixels. The
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threshold defines at what distance new points or line ends are snapped to
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existing nodes. This helps to prevent gaps or dangles between boundaries. The
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default is set to 10 pixels.
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<P>
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<DIV ALIGN="CENTER"><A NAME="fig:grass_digitizing_settings"></A><A NAME="333"></A>
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<TABLE>
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<CAPTION ALIGN="BOTTOM"><STRONG>Figure:</STRONG>
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GRASS Digitizing Settings Tab </CAPTION>
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<TR><TD>
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<DIV ALIGN="CENTER">
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[clip=true,width=8cm]grass_digitizing_settings
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</DIV></TD></TR>
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</TABLE>
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</DIV>
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<P>
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Symbology Tab<A NAME="339"></A>
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<P>
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The Symbology tab allows you to view and set symbology and color
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settings for various geometry types and their topological status (e.g. closed
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/ opened boundary).
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<P>
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<DIV ALIGN="CENTER"><A NAME="fig:grass_digitizing_symbology"></A><A NAME="343"></A>
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<TABLE>
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<CAPTION ALIGN="BOTTOM"><STRONG>Figure:</STRONG>
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GRASS Digitizing Symbolog Tab </CAPTION>
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<TR><TD>
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<DIV ALIGN="CENTER">
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[clip=true,width=8cm]grass_digitizing_symbology
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</DIV></TD></TR>
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</TABLE>
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</DIV>
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<P>
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Table Tab <A NAME="349"></A>
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<P>
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The Table tab provides information about the database table for
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a given 'layer'. Here you can add new columns to an existing attribute table,
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or create a new database table for a new GRASS vector layer (see Section
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<A HREF="node9.html#sec:creating_new_grass_vectors">9.6</A>).
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<P>
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<DIV ALIGN="CENTER"><A NAME="fig:grass_digitizing_table"></A><A NAME="354"></A>
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<TABLE>
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<CAPTION ALIGN="BOTTOM"><STRONG>Figure:</STRONG>
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GRASS Digitizing Table Tab </CAPTION>
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<TR><TD>
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<DIV ALIGN="CENTER">
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[clip=true,width=10cm]grass_digitizing_table
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</DIV></TD></TR>
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</TABLE>
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</DIV>
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<BR>
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<P>
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2009年10月4日 (日) 22:19時点における最新版

--Sanak 2009年10月4日 (日) 13:19 (UTC)このページは削除予定です。

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