[QGIS Commit] r14301 - docs/branches/1.4.0/italian/user_guide
svn_qgis at osgeo.org
svn_qgis at osgeo.org
Mon Sep 27 17:08:11 EDT 2010
Author: alesarrett
Date: 2010-09-27 21:08:11 +0000 (Mon, 27 Sep 2010)
New Revision: 14301
Modified:
docs/branches/1.4.0/italian/user_guide/working_with_vector.tex
Log:
working_with_vectors.tex it translation update
Modified: docs/branches/1.4.0/italian/user_guide/working_with_vector.tex
===================================================================
--- docs/branches/1.4.0/italian/user_guide/working_with_vector.tex 2010-09-27 21:07:28 UTC (rev 14300)
+++ docs/branches/1.4.0/italian/user_guide/working_with_vector.tex 2010-09-27 21:08:11 UTC (rev 14301)
@@ -422,6 +422,70 @@
gsherman at madison:~/current$
\end{verbatim}
+\subsubsection{Layer vettoriali che attraversano 180$^\circ$ di longitudine}
+\index{vector layers!crossing}
+
+Many GIS packages don't wrap vector maps, with a geographic reference system
+(lat/lon), crossing the \degrees{180} longitude line. As result, if
+we open such map in QGIS, we will see two far, distinct locations, that
+should show near each other. In Figure \ref{fig:vector_not_wrapping} the tiny
+point on the far left of the map canvas (Chatham Islands), should be within
+the grid, right of New Zealand main islands.
+
+\begin{figure}[ht]
+ \begin{center}
+ \caption{Map in lat/lon crossing the \degrees{180} longitude line
+ \nixcaption}
+ \label{fig:vector_not_wrapping}\smallskip
+ \includegraphics[clip=true, width=\textwidth]{vectorNotWrapping}
+\end{center}
+\end{figure}
+
+A workaround is to transform the longitude values using PostGIS and the
+\textbf{ST\textunderscore Shift\textunderscore Longitude}
+\footnote{\url{http://postgis.refractions.net/documentation/manual-1.4/ST_Shift_Longitude.html}}
+function. This function reads every point/vertex in every component of every
+feature in a geometry, and if the longitude coordinate is < \degrees{0} adds
+\degrees{360} to it. The result would be a \degrees{0} - \degrees{360} version of
+the data to be plotted in a \degrees{180} centric map.
+
+\begin{figure}[ht]
+ \begin{center}
+ \caption{Map crossing \degrees{180} longitude applying the ST\textunderscore Shift\textunderscore Longitude function \nixcaption}
+\label{fig:vector_wrapping}\smallskip
+ \includegraphics[clip=true, width=9cm]{vectorWrapping}
+\end{center}
+\end{figure}
+
+\minisec{Utilizzo}
+
+\begin{itemize}
+\item Import data to PostGIS (\ref{sec:loading_postgis_data}) using for
+example the PostGIS Manager plugin or the SPIT plugin
+\item Use the PostGIS command line interface to issue the following command
+(this is an example where "TABLE" is the actual name of your PostGIS table) \\
+\texttt{gis\_data=\# update TABLE set the\_geom=ST\_shift\_longitude(the\_geom);}
+\item If everything went right you should receive a confirmation about the
+number of features that were updated, then you'll be able to load the map and
+see the difference (Figure \ref{fig:vector_wrapping})
+\end{itemize}
+
+\subsection{Layer SpatiaLite}
+\index{SpatiaLite layers!properties dialog}
+\index{vector layers!SpatlaLIte|see{SpatiaLite}}
+\index{SpatiaLite!layers}
+\label{label_spatialite}
+
+\includegraphics[width=0.7cm]{mActionAddSpatiaLiteLayer}
+The first time you load data from a Spatialite database, begin by clicking on the
+\toolbtntwo{mActionAddSpatiaLiteLayer}{Add SpatiaLite Layer} toolbar button or by selecting the
+\dropmenuopttwo{mActionAddSpatiaLiteLayer}{Add SpatiaLite Layer...}
+option from the \mainmenuopt{Layer} menu or by typing \keystroke{L}.
+This will bring up a window, which will allow you to either connect to a Spatialite database already known to QGIS, which
+you can choose from the dropdown menu or to define a new connection to a new database. To define a new connection,
+click on \button{New} and use the file browser to point to your SpatiaLite database,
+which is a file with a \filename{.sqlite } extension.
+
\subsection{Proprietà dei layer vettoriali}\label{sec:vectorprops}
\index{layer vettoriali!finestra delle proprietà}
@@ -528,15 +592,202 @@
Ciò può essere molto utile per la visualizzazione di più layer vettoriali
sovrapposti.
-\subsubsection{Scheda Metadata}
+\subsubsection{New Generation Symbology}
-La scheda \tab{Metadata} contiene informazioni relative al layer quali il formato, la posizione, il
-numero ed il tipo di geometrie e le possibilità di modifica. Nella sezione
-\guiheading{Sistema di riferimento spaziale del layer} è visualizzata la proiezione associata al
-dato, mentre quella \guiheading{Informazioni campo attributi} fornisce il nome
-e il formato dei campi della tabella associata. Questo è un metodo veloce per
-ottenere informazioni sul layer.
+In QGIS \CURRENT a new symbology was integrated in parallel with the symbology
+described above. This new generation symbology provides a variety of improvements and
+new features and will replace the current symbology in one of the upcoming releases.
+To switch to the new symbolgy you currently have to click on the \button{new symbology} button in the \tab{General} tab of the \dialog{Layer Properties} dialog.
+\minisec{Understanding the new generation symbology}
+
+There are three types of symbols: marker symbols (for points), line symbols and
+fill symbols (for polygons). Symbols can consist of one or more symbol layers. It
+is possible to define the color of a symbol and this color is then defined for all
+symbol layers. Some layers may have the color locked - for those the color can not
+be altered. This is useful when you define the color of a multilayer symbol.
+Similarly, it is possible to define the width for line symbols, as well as size and
+angle for marker symbols.
+
+\minisec{Available symbol layer types}
+
+\begin{itemize}
+\item \textbf{Simple marker}: Rendering with one of hardcoded markers.
+\item \textbf{Simple line}: Usual rendering of a line (with specified
+width, color and pen style)
+\item \textbf{Simple fill}: Usual rendering of a polygon (with defined
+fill color, fill pattern and outline)
+\item \textbf{SVG marker}: Rendering with a SVG picture
+\item \textbf{Marker line}: A line rendered by repeating a marker symbol
+\end{itemize}
+
+\minisec{Color ramps}
+
+Color ramps are used to define a range of colors that can be used during
+the creation of renderers. The symbol's color will be set from the color ramp.
+There are two types of color ramps:
+
+\begin{itemize}
+\item \textbf{Gradient}: Linear gradient from one color to some other.
+\item \textbf{random}: Randomly generated colors from a specified area of
+color space
+\end{itemize}
+
+\minisec{Styles}
+
+A style groups a set of various symbols and color ramps. You can define your
+prefered or frequently used symbols, and can use it without having to recreate
+it everytime. Style items (symbols and color ramps) have always a name by which
+they can be queried from the style. There is one default style in QGIS (modifiable)
+and the user can add further styles.
+
+\minisec{Renderers}
+
+The renderer is responsible for drawing a feature together with the correct
+symbol. There are three types of renderers: single symbol, categorized (called
+unique color in the old symbology), and graduated. There is no continuous color
+renderer, because it is in fact only a special case of the graduated renderer.
+The categorized and graduated renderer can be created by specifying a symbol
+and a color ramp - they will set the colors for symbols appropriately.
+
+\subsubsection{Working with the New Generation Symbology}
+
+First you have to enable the new generation symbology clicking on the
+\button{new symbology} button in the \tab{General} tab of the
+\dialog{Layer Properties} dialog. The new dialog allows to choose one of the
+three renderers: single symbol, categorized and graduated. Depending on the
+chosen renderer, the symbology tab provides different settings and options, that
+will be described in the following sections.
+
+\minisec{Single Symbol Renderer}
+
+The Single Symbol Renderer is used to render all features of the layer using a
+single user-defined symbol. The properties, that can be adjusted in the
+Symbology tab, depend partially on the type of the layer, but all types share
+the following structure. In the top left part of the tab, there is a preview of
+the current symbol to be rendered. In the bottom part of the tab, there is a
+list of symbols already defined for the current style, prepared to be used via
+selecting them from the list. The current symbol can be modified using the
+\button{Properties} button, which opens a \dialog{Symbol Properties} dialog, or
+the \button{Set Color} button, which opens an ordinary \dialog{Color} dialog.
+After having done any needed changes, the symbol can be added to the list of
+current style symbols (using the \button{Add to style} button) and then easily
+be used in the future.
+
+\begin{figure}[h]
+\centering
+\caption{New Single Symbolizing options \nixcaption}
+ \subfigure[Single symbol point properties] {\label{subfig:singleNG1}\includegraphics[clip=true, width=0.3\textwidth]{singlesymbol_ng_point}}\goodgap
+ \subfigure[Single symbol line properties] {\label{subfig:singleNG2}\includegraphics[clip=true, width=0.3\textwidth]{singlesymbol_ng_line}}\goodgap
+ \subfigure[Single symbol area properties] {\label{subfig:singleNG3}\includegraphics[clip=true, width=0.3\textwidth]{singlesymbol_ng_area}}
+\end{figure}
+
+\minisec{Categorized Renderer}
+
+The Categorized Renderer is used to render all features from a layer, using a
+single user-defined symbol, which color reflects the value of a selected
+feature's attribute. The Symbology tab allows you to select:
+
+\begin{itemize}
+\item The attribute (using the Column listbox)
+\item The symbol (using the Symbol Properties dialog)
+\item The colors (using the Color Ramp listbox)
+\end{itemize}
+
+For convenience, the list in the bottom part of the tab lists the values of
+all currently selected attributes together, including the symbols that will
+be rendered.
+
+The example in figure \ref{fig:catsymNG} shows the category rendering dialog
+used for the rivers layer of the qgis sample dataset.
+
+\begin{figure}[ht]
+ \begin{center}
+ \caption{New Categorized Symbolizing options \nixcaption}\label{fig:catsymNG}\smallskip
+ \includegraphics[clip=true, width=10cm]{categorysymbol_ng_line}
+\end{center}
+\end{figure}
+
+\minisec{Graduated rendering}
+
+The Graduated Renderer is used to render all the features from a layer, using
+a single user-defined symbol, whose color reflects the classification of a selected
+feature's attribute to a class.
+
+Analogue to the categorized rendered, the symbology tab allows you to select:
+
+\begin{itemize}
+\item The attribute (using the Column listbox)
+\item The symbol (using the Symbol Properties button)
+\item The colors (using the Color Ramp list)
+\end{itemize}
+
+Additionally, you can specify the number of classes and also the mode how to
+classify features inside the classes (using the Mode list). The listbox in the
+bottom part of the symbology tab lists the classes together with their ranges,
+labels and symbols that will be rendered.
+
+The example in figure \ref{fig:gradsymNG} shows the category rendering dialog
+for the rivers layer of the qgis sample dataset.
+
+\begin{figure}[ht]
+ \begin{center}
+ \caption{New Graduated Symbolizing options \nixcaption}\label{fig:gradsymNG}\smallskip
+ \includegraphics[clip=true, width=10cm]{graduatesymbol_ng_line}
+\end{center}
+\end{figure}
+
+\minisec{Symbol Properties}
+
+The symbol properties dialog allows the user to specify different properties of
+the symbol to be rendered. In the top left part of the dialog, you find a preview
+of the current symbol as it will be displayed in the map canvas. Below the preview
+is the list of symbol layers. To start the symbol properties dialog, click the
+\dropmenuopttwo{mActionOptions}{Properties} button in the \tab{General} tab of the
+\dialog{Layer Properties} dialog.
+
+The control panels allow adding or removing layers, changing the position of layers,
+or locking layers for color changes. In the right part of the dialog, there are
+shown the settings applicable to the single symbol layer selected in the symbol
+layer list. The most important is the 'Symbol Layer Type' combo box, which allows
+you to choose the layer type. The available options are \filename{SimpleLine},
+\filename{SvgMarker} and \filename{SimpleFill}.
+
+Depending on the chosen value, these settings are available in the right part
+of the dialog:
+
+\begin{itemize}
+\item \textbf{SimpleLine}: Color, Pen width, Pen style, Offset, Join style and Cap style;
+\item \textbf{SvgMarker}: Size, Angle, Offset X, Offset Y and SVG Image
+\item \textbf{SimpleFill}: Color, Border color, Fill style.
+\end{itemize}
+
+Example: A picture showing a line symbol composed from three simple lines with different pen widths.
+Example: Symbol properties for a point layer
+Example: Symbol properties filling pattern for a polygon layer
+
+\begin{figure}[h]
+\centering
+\caption{Defining symbol properties \nixcaption}
+ \subfigure[Line composed from three simple lines] {\label{subfig:symprops1}\includegraphics[clip=true, width=0.3\textwidth]{symbolproperties1}}\goodgap
+ \subfigure[Symbol properties for point layer] {\label{subfig:symprops2}\includegraphics[clip=true, width=0.3\textwidth]{symbolproperties2}}\goodgap
+ \subfigure[Filling pattern for a polygon] {\label{subfig:symprops3}\includegraphics[clip=true, width=0.3\textwidth]{symbolproperties3}}
+\end{figure}
+
+\subsubsection{Style Manager to manage symbols and color ramps}
+
+The Style Manger is a small helper application, that lists symbols and color
+ramps available in a style. It also allows you to add and/or remove items. To
+launch the Style Manager, click on \mainmenuopt{Settings} > \dropmenuopt{Style
+Manager} in the mai menu.
+
+\begin{figure}[ht]
+ \begin{center}
+ \caption{Style Manager to manage symbols and color ramps \nixcaption}\label{fig:stylemanager}\smallskip
+ \includegraphics[clip=true, width=7cm]{stylemanager}
+\end{center}
+\end{figure}
+
\subsubsection{Scheda Etichette}
La scheda \tab{Etichette} consente di abilitare la visualizzazione delle
@@ -624,6 +875,77 @@
Si noti che la scheda \tab{Etichette} fornisce una \classname{Anteprima}
nella quale viene mostrata l'etichetta predefinita.
+\subsubsection{Attributes Tab}\index{Attributes}\label{label_attributes}
+
+Within the \tab{Attributes} tab the attributes of the selected dataset can be
+manipulated. The buttons \toolbtntwo{mActionNewAttribute}{New Column} and
+\toolbtntwo{mActionDeleteAttribute}{Delete Column} can be
+used, when the dataset is \toolbtntwo{mActionToggleEditing}{editing mode}.
+At the moment only columns from PostGIS layers can be removed and added. The
+OGR library supports to add new columns, but not to remove them, if you have
+a GDAL version >= 1.6 installed.
+
+\minisec{edit widget}
+
+\begin{figure}[H]
+ \begin{center}
+ \caption{Dialog to select an edit widget for an attribute column
+\nixcaption}\label{fig:editwidget}\smallskip
+ \includegraphics[clip=true, width=14cm]{editwidgetsdialog}
+\end{center}
+\end{figure}
+
+Within the \tab{Attributes} tab you also find an \texttt{edit widget} column.
+This column can be used to define values or a range of values that are
+allowed
+to be added to the specific attribute table column. If you click on the
+\button{edit widget} button, a dialog opens, where you can define different
+widgets. These widgets are:
+
+\begin{itemize}
+\item Line edit: an edit field which allows to enter simple text (or restrict
+to
+numbers for numeric attributes).
+\item Classification: Displays a combo box with the values used for
+classification, if you have chosen 'unique value' as legend type in the
+symbology tab of the properties dialog.
+\item Range: Allows to set numeric values from a specific range. The edit
+widget can be either a slider or a spin box.
+\item Unique value: The user can select one of the values already used in the
+attribute table. If editable is activated, a line edit is shown with
+autocompletion support, otherwise a combo box is used.
+\item File name: Simplifies the selection by adding a file chooser dialog.
+\item Value map: a combo box with predefined items. The value is stored in
+the attribute, the description is shown in the comboo box. You can define
+values manually or load them from a layer or a csv file.
+\item Enumeration: Opens a combo box with values that can be used within the
+columns type. This is currently only supported by the postgres provider.
+\item Immutable: The immutable attribute column is read-only. The user is not
+able to modify the content.
+\end{itemize}
+
+\subsubsection{General Tab}\label{vectorgeneraltab}
+
+The \tab{General} tab is essentially like that of the raster dialog. It
+allows you to change the display name, set scale dependent rendering options,
+create a spatial index of the vector file (only for OGR supported formats and
+PostGIS) and view or change the projection of the specific vetor layer.
+
+The \button{Query Builder} button allows you to create a subset of the
+features in the layer - but this button currently only is available when you
+open the attribute table and select the \button{...} button next to Advanced
+search.
+
+\subsubsection{Metadata Tab}\index{Metadata}
+
+The \tab{Metadata} tab contains general information about the layer,
+including specifics about the type and location, number of features, feature
+type, and the editing capabilities. The \guiheading{Extents} section,
+providing
+layer extent information, and the \guiheading{Layer Spatial Reference System}
+section, providing information about the CRS of the layer. This is a quick
+way to get information about the layer, but is not yet editable.
+
\subsubsection{Scheda Azioni}\index{azioni}\label{label_actions}
QGIS offre la possibilità di effettuare azioni sulla base degli
@@ -868,6 +1190,12 @@
\textbf{Nota} - la procedura per la modifica di layer GRASS è differente, si
veda la Sezione \ref{grass_digitising} per dettagli.
+\begin{Tip}[ht]\caption{\textsc{Concurrent Edits}}
+\qgistip{This version of QGIS does not track if somebody else is editing a
+feature at the same time as you. The last person to save their edits wins.
+}
+\end{Tip}
+
\subsubsection{Settare la tolleranza dello snapping e il raggio di ricerca
degli elementi}
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