[QGIS Commit] r9988 - in docs: tags/1.0.0_user_guide
trunk/english_us/user_guide
svn_qgis at osgeo.org
svn_qgis at osgeo.org
Tue Jan 20 06:51:27 EST 2009
Author: dassau
Date: 2009-01-20 06:51:26 -0500 (Tue, 20 Jan 2009)
New Revision: 9988
Modified:
docs/tags/1.0.0_user_guide/working_with_projections.tex
docs/trunk/english_us/user_guide/working_with_projections.tex
Log:
added comments from Carson and revised the section again
Modified: docs/tags/1.0.0_user_guide/working_with_projections.tex
===================================================================
--- docs/tags/1.0.0_user_guide/working_with_projections.tex 2009-01-20 09:39:04 UTC (rev 9987)
+++ docs/tags/1.0.0_user_guide/working_with_projections.tex 2009-01-20 11:51:26 UTC (rev 9988)
@@ -7,33 +7,33 @@
% comment out the following line:
%\updatedisclaimer
-QGIS allows to define a global and project wide projection for layers without
-CRS (Coordinate Reference System). It also allows the definition of custom
-projections and supports on-the-fly (OTF) projection of vector layers. All
-these features allow you to display layers with different coordinate systems
-and have them overlay properly.
+QGIS allows users to define a global and project-wide CRS (Coordinate
+Reference System) for layers without a pre-defined CRS. It also allows the
+user to define custom coordinate reference systems and supports on-the-fly
+(OTF) projection of vector layers. All these features allow the user to
+display layers with different CRS and have them overlay properly.
\subsection{Overview of Projection Support}\label{label_projoverview}
-QGIS has support for approximately 2,700 known projections.
-Projections are stored in a SQLite database that is installed with QGIS.
-Normally you do not need to manipulate the database directly. In fact,
-doing so may cause projection support to fail. Custom projections are
-stored in a user database. See Section \ref{sec:customprojections} for
-information on managing your custom projections.
+QGIS has support for approximately 2,700 known CRS. Definitions for
+each of these CRS are stored in a SQLite database that is installed with
+QGIS. Normally you do not need to manipulate the database directly. In fact,
+doing so may cause projection support to fail. Custom CRS are stored in a
+user database. See Section \ref{sec:customprojections} for
+information on managing your custom coordinate reference systems.
-The projections available in QGIS are based on those defined by
+The CRS available in QGIS are based on those defined by
EPSG\index{EPSG} and are largely abstracted from the spatial\_references
table in PostGIS\index{PostGIS} version 1.x. The EPSG identifiers are
-present in the database and can be used to specify a projection in QGIS.
+present in the database and can be used to specify a CRS in QGIS.
In order to use OTF projection, your data must contain information about its
-coordinate system or you have to define a global, layer or project wide CRS.
-For PostGIS layers QGIS uses the spatial reference identifier that was specified
-when the layer was created. For data supported by OGR, QGIS relies on the
-presence of a format specific means of specifying the coordinate system. In
-the case of shapefiles, this means a file containing the Well Known Text
-(WKT)\index{WKT} specification of the coordinate system. The projection file
+coordinate reference system or you have to define a global, layer or
+project-wide CRS. For PostGIS layers QGIS uses the spatial reference
+identifier that was specified when the layer was created. For data supported
+by OGR, QGIS relies on the presence of a format specific means of specifying
+the CRS. In the case of shapefiles, this means a file containing the Well
+Known Text (WKT)\index{WKT} specification of the CRS. The projection file
has the same base name as the shapefile and a prj extension. For example, a
shapefile named \filename{alaska.shp} would have a corresponding projection
file named \filename{alaska.prj}.
@@ -42,12 +42,12 @@
\index{Projections!specifying}
\label{sec:projection-specifying}
-QGIS does not anymore set the map projection to the coordinate system of the
+QGIS no longer sets the map CRS to the coordinate reference system of the
first layer loaded. When you start a QGIS session with layers that do not
-have a coordinate reference system (CRS), you need to control and define
-projection definition for these layers. This can be done global or project
-wide in the \tab{CRS} tab under \mainmenuopt{Settings} >
-\dropmenuopttwo{mActionOptions}{Options} (See Figure~\ref{fig:crsdialog}).
+have a CRS, you need to control and define the CRS definition for these
+layers. This can be done globally or project-wide in the \tab{CRS} tab under
+\mainmenuopt{Settings} > \dropmenuopttwo{mActionOptions}{Options} (See
+Figure~\ref{fig:crsdialog}).
\begin{itemize}
\item \checkbox{Prompt for CRS}
@@ -66,37 +66,36 @@
\end{center}
\end{figure}
-If you want to define a projection for a certain layer that does not have a
-coordinate reference system (CRS), you can also do that in the \tab{General}
-tab of the raster properties (\ref{label_generaltab}) and vector properties
-(\ref{vectorgeneraltab}) dialog. If your layer already has a CRS, it will be
-displayed as shown in Figure~\ref{fig:vector_symbology}.
+If you want to define a coordinate reference system for a certain layer that
+does not provide projection information, you can also do that in the
+\tab{General} tab of the raster properties (\ref{label_generaltab}) and
+vector properties (\ref{vectorgeneraltab}) dialog. If your layer already has
+a CRS, it will be displayed as shown in Figure~\ref{fig:vector_symbology}.
\subsection{Define On The Fly (OTF) Projection}\label{label_projstart}
QGIS does not have OTF projection enabled per default and it is currently
only supported for vector layers. To use OTF projection, you must open the
\dropmenuopttwo{mActionOptions}{Project Properties} dialog, select a
-projection and activate the \checkbox{Enable on the fly projection} checkbox.
+CRS and activate the \checkbox{Enable on the fly projection} checkbox.
There are two ways to open the dialog:
\begin{enumerate}
\item Select \dropmenuopttwo{mActionOptions}{Project Properties} from the
\mainmenuopt{Settings} menu.
\item Click on the \toolbtntwo{mIconProjectionEnabled}{projector} icon in the
-lower right-hand corner of the
-statusbar.
+lower right-hand corner of the statusbar.
\end{enumerate}
If you have already loaded a layer and want to enable OTF projection, you
-have to open the \tab{Projection} tab of the \dialog{Project Properties}
-dialog and find the CRS of the already loaded layer in the list of
-projections and activate the \checkbox{Enable on the fly projection}
-checkbox.. All vector layers loaded afterwards will then be OTF projected to
-the defined CRS.
+have to open the \tab{Coordinate Reference System} tab of the \dialog{Project
+Properties} dialog and find the CRS of the already loaded layer in the list
+of CRS and activate the \checkbox{Enable on the fly projection} checkbox. All
+vector layers loaded afterwards will then be OTF projected to the defined CRS.
-The Projection tab of the \dialog{Project Properties} dialog contains four
-important components as numbered in Figure \ref{fig:projections} and described below.
+The \tab{Coordinate Reference System} tab of the \dialog{Project Properties}
+dialog contains four important components as numbered in Figure
+\ref{fig:projections} and described below.
\begin{figure}[ht]
\begin{center}
@@ -106,84 +105,80 @@
\end{figure}
\begin{enumerate}
-\item \textbf{Enable on the fly projection}\index{Projections!enabling} - this checkbox is used
-to enable or disable OTF
-projection. When off, no projection takes place and each layer
-is drawn using the coordinates as read from the data source. When on, the
-coordinates in each layer are projected to the coordinate system of the map
-canvas.
-\item \textbf{Coordinate Reference System} - this is a list of all projection
+\item \textbf{Enable on the fly projection}\index{Projections!enabling} -
+this checkbox is used to enable or disable OTF projection. When off, no
+projection takes place and each layer is drawn using the coordinates as read
+from the data source. When on, the coordinates in each layer are projected to
+the coordinate reference system defined for the map canvas.
+\item \textbf{Coordinate Reference System} - this is a list of all CRS
supported by QGIS, including Geographic, Projected and Custom coordinate
-systems. To use a coordinate system, select it from the list by expanding the
-appropriate node and selecting the projection. The active projection is
-preselected.
-\item \textbf{Proj4 text} - this is the projection string used by the Proj4 projection
-engine. This text is read-only and provided for informational purposes.
+reference systems. To use a CRS, select it from the list by expanding
+the appropriate node and selecting the CRS. The active CRS is preselected.
+\item \textbf{Proj4 text} - this is the CRS string used by the Proj4
+projection engine. This text is read-only and provided for informational
+purposes.
\item \textbf{Search} - if you know the EPSG identifier or the name
-for a projection, you can use the search feature to find it. Enter the
-identifier and click on \button{Find}.
+for a Coordinate Reference System, you can use the search feature to find it.
+Enter the identifier and click on \button{Find}.
\end{enumerate}
\begin{Tip}
\caption{\textsc{Project Properties Dialog}}
\qgistip{
-If you open the \dialog{Project Properties} dialog from the \mainmenuopt{Settings} menu, you
-must
-click on the \tab{Projection} tab to view the projection settings. Opening
-the dialog from the \toolbtntwo{mIconProjectionEnabled}{projector} icon will automatically bring the
-\tab{Projection} tab to the front.
+If you open the \dialog{Project Properties} dialog from the
+\mainmenuopt{Settings} menu, you must click on the \tab{Coordinate Reference
+System} tab to view the CRS settings. Opening the dialog from the
+\toolbtntwo{mIconProjectionEnabled}{projector} icon will automatically bring
+the \tab{Coordinate Reference System} tab to the front.
}
\end{Tip}
-\subsection{Custom Projections}\label{sec:customprojections}
+\subsection{Custom Coordinate Reference System}\label{sec:customprojections}
\index{Projections!custom}
-If QGIS does not provide the Coordinate Reference System (CRS) you need, you
-can define a custom projection. To define a projection, select
+If QGIS does not provide the coordinate reference system you need, you
+can define a custom CRS. To define a CRS, select
\dropmenuopttwo{mIconNew}{Custom CRS} from the \mainmenuopt{Settings} menu.
-Custom projections are stored in your QGIS user database. In addition to your
-projections, this database contains your spatial bookmarks and other custom data.
+Custom CRS are stored in your QGIS user database. In addition to your custom
+CRS, this database also contains your spatial bookmarks and other custom data.
\begin{figure}[ht]
\begin{center}
- \caption{Custom Projection Dialog \nixcaption}\label{fig:customprojections}\smallskip
+ \caption{Custom CRS Dialog \nixcaption}\label{fig:customprojections}\smallskip
\includegraphics[clip=true, width=12cm]{customProjectionDialog}
\end{center}
\end{figure}
-Defining a custom projection in QGIS requires a good understanding of the
-Proj.4 projection library. To begin, refer to the
-Cartographic Projection Procedures for the UNIX Environment - A User's Manual
-by Gerald I. Evenden, U.S. Geological Survey Open-File Report 90-284, 1990
-(available at \url{ftp://ftp.remotesensing.org/proj/OF90-284.pdf}).
+Defining a custom CRS in QGIS requires a good understanding of the Proj.4
+projection library. To begin, refer to the Cartographic Projection Procedures
+for the UNIX Environment - A User's Manual by Gerald I. Evenden, U.S.
+Geological Survey Open-File Report 90-284, 1990 (available at \url{ftp://ftp.remotesensing.org/proj/OF90-284.pdf}).
This manual describes the use of the \usertext{proj.4} and related command line
utilities. The cartographic parameters used with \usertext{proj.4} and described
in the user manual are the same as those used by QGIS.
The \dialog{Custom Coordinate Reference System Definition} dialog requires
-only two parameters to define a user projection:
+only two parameters to define a user CRS:
\begin{enumerate}
\item a descriptive name and
\item the cartographic parameters in PROJ.4 format.
\end{enumerate}
-To create a new projection, click the
-\toolbtntwo{mIconNew}{New} button and enter a descriptive
-name and the projection parameters.
-After that you can save your projektion by clicking the button
-\toolbtntwo{mActionFileSave}{Save}.
+To create a new CRS, click the \toolbtntwo{mIconNew}{New} button and enter a
+descriptive name and the CRS parameters. After that you can save your CRS by
+clicking the button \toolbtntwo{mActionFileSave}{Save}.
Note that the \guilabel{Parameters} must begin with a \usertext{+proj=}-block,
-to represent the new projection.
+to represent the new coordinate reference system.
-Figure \ref{fig:customprojections} shows
-the dialog with an example projection. The parameters shown were entered based
-on a knowledge of the projection and the information found in OF90-284.
+Figure \ref{fig:customprojections} shows the dialog with an example CRS. The
+parameters shown were entered based on a knowledge of the CRS and the
+information found in OF90-284.
-You can test your projection parameters to see if they give sane results by
+You can test your CRS parameters to see if they give sane results by
clicking on the \button{Calculate} button inside the \guiheading{Test} block
-and pasting your projection parameters into
+and pasting your CRS parameters into
the \guilabel{Parameters} field. Then enter known WGS 84 latitude and longitude
values in \guilabel{North} and \guilabel{East} fields respectively.
-Click on \button{Calculate} and compare the results with the known values in your projected coordinate
-system.
+Click on \button{Calculate} and compare the results with the known values in
+your coordinate reference system.
Modified: docs/trunk/english_us/user_guide/working_with_projections.tex
===================================================================
--- docs/trunk/english_us/user_guide/working_with_projections.tex 2009-01-20 09:39:04 UTC (rev 9987)
+++ docs/trunk/english_us/user_guide/working_with_projections.tex 2009-01-20 11:51:26 UTC (rev 9988)
@@ -7,33 +7,33 @@
% comment out the following line:
%\updatedisclaimer
-QGIS allows to define a global and project wide projection for layers without
-CRS (Coordinate Reference System). It also allows the definition of custom
-projections and supports on-the-fly (OTF) projection of vector layers. All
-these features allow you to display layers with different coordinate systems
-and have them overlay properly.
+QGIS allows users to define a global and project-wide CRS (Coordinate
+Reference System) for layers without a pre-defined CRS. It also allows the
+user to define custom coordinate reference systems and supports on-the-fly
+(OTF) projection of vector layers. All these features allow the user to
+display layers with different CRS and have them overlay properly.
\subsection{Overview of Projection Support}\label{label_projoverview}
-QGIS has support for approximately 2,700 known projections.
-Projections are stored in a SQLite database that is installed with QGIS.
-Normally you do not need to manipulate the database directly. In fact,
-doing so may cause projection support to fail. Custom projections are
-stored in a user database. See Section \ref{sec:customprojections} for
-information on managing your custom projections.
+QGIS has support for approximately 2,700 known CRS. Definitions for
+each of these CRS are stored in a SQLite database that is installed with
+QGIS. Normally you do not need to manipulate the database directly. In fact,
+doing so may cause projection support to fail. Custom CRS are stored in a
+user database. See Section \ref{sec:customprojections} for
+information on managing your custom coordinate reference systems.
-The projections available in QGIS are based on those defined by
+The CRS available in QGIS are based on those defined by
EPSG\index{EPSG} and are largely abstracted from the spatial\_references
table in PostGIS\index{PostGIS} version 1.x. The EPSG identifiers are
-present in the database and can be used to specify a projection in QGIS.
+present in the database and can be used to specify a CRS in QGIS.
In order to use OTF projection, your data must contain information about its
-coordinate system or you have to define a global, layer or project wide CRS.
-For PostGIS layers QGIS uses the spatial reference identifier that was specified
-when the layer was created. For data supported by OGR, QGIS relies on the
-presence of a format specific means of specifying the coordinate system. In
-the case of shapefiles, this means a file containing the Well Known Text
-(WKT)\index{WKT} specification of the coordinate system. The projection file
+coordinate reference system or you have to define a global, layer or
+project-wide CRS. For PostGIS layers QGIS uses the spatial reference
+identifier that was specified when the layer was created. For data supported
+by OGR, QGIS relies on the presence of a format specific means of specifying
+the CRS. In the case of shapefiles, this means a file containing the Well
+Known Text (WKT)\index{WKT} specification of the CRS. The projection file
has the same base name as the shapefile and a prj extension. For example, a
shapefile named \filename{alaska.shp} would have a corresponding projection
file named \filename{alaska.prj}.
@@ -42,12 +42,12 @@
\index{Projections!specifying}
\label{sec:projection-specifying}
-QGIS does not anymore set the map projection to the coordinate system of the
+QGIS no longer sets the map CRS to the coordinate reference system of the
first layer loaded. When you start a QGIS session with layers that do not
-have a coordinate reference system (CRS), you need to control and define
-projection definition for these layers. This can be done global or project
-wide in the \tab{CRS} tab under \mainmenuopt{Settings} >
-\dropmenuopttwo{mActionOptions}{Options} (See Figure~\ref{fig:crsdialog}).
+have a CRS, you need to control and define the CRS definition for these
+layers. This can be done globally or project-wide in the \tab{CRS} tab under
+\mainmenuopt{Settings} > \dropmenuopttwo{mActionOptions}{Options} (See
+Figure~\ref{fig:crsdialog}).
\begin{itemize}
\item \checkbox{Prompt for CRS}
@@ -66,37 +66,36 @@
\end{center}
\end{figure}
-If you want to define a projection for a certain layer that does not have a
-coordinate reference system (CRS), you can also do that in the \tab{General}
-tab of the raster properties (\ref{label_generaltab}) and vector properties
-(\ref{vectorgeneraltab}) dialog. If your layer already has a CRS, it will be
-displayed as shown in Figure~\ref{fig:vector_symbology}.
+If you want to define a coordinate reference system for a certain layer that
+does not provide projection information, you can also do that in the
+\tab{General} tab of the raster properties (\ref{label_generaltab}) and
+vector properties (\ref{vectorgeneraltab}) dialog. If your layer already has
+a CRS, it will be displayed as shown in Figure~\ref{fig:vector_symbology}.
\subsection{Define On The Fly (OTF) Projection}\label{label_projstart}
QGIS does not have OTF projection enabled per default and it is currently
only supported for vector layers. To use OTF projection, you must open the
\dropmenuopttwo{mActionOptions}{Project Properties} dialog, select a
-projection and activate the \checkbox{Enable on the fly projection} checkbox.
+CRS and activate the \checkbox{Enable on the fly projection} checkbox.
There are two ways to open the dialog:
\begin{enumerate}
\item Select \dropmenuopttwo{mActionOptions}{Project Properties} from the
\mainmenuopt{Settings} menu.
\item Click on the \toolbtntwo{mIconProjectionEnabled}{projector} icon in the
-lower right-hand corner of the
-statusbar.
+lower right-hand corner of the statusbar.
\end{enumerate}
If you have already loaded a layer and want to enable OTF projection, you
-have to open the \tab{Projection} tab of the \dialog{Project Properties}
-dialog and find the CRS of the already loaded layer in the list of
-projections and activate the \checkbox{Enable on the fly projection}
-checkbox.. All vector layers loaded afterwards will then be OTF projected to
-the defined CRS.
+have to open the \tab{Coordinate Reference System} tab of the \dialog{Project
+Properties} dialog and find the CRS of the already loaded layer in the list
+of CRS and activate the \checkbox{Enable on the fly projection} checkbox. All
+vector layers loaded afterwards will then be OTF projected to the defined CRS.
-The Projection tab of the \dialog{Project Properties} dialog contains four
-important components as numbered in Figure \ref{fig:projections} and described below.
+The \tab{Coordinate Reference System} tab of the \dialog{Project Properties}
+dialog contains four important components as numbered in Figure
+\ref{fig:projections} and described below.
\begin{figure}[ht]
\begin{center}
@@ -106,84 +105,80 @@
\end{figure}
\begin{enumerate}
-\item \textbf{Enable on the fly projection}\index{Projections!enabling} - this checkbox is used
-to enable or disable OTF
-projection. When off, no projection takes place and each layer
-is drawn using the coordinates as read from the data source. When on, the
-coordinates in each layer are projected to the coordinate system of the map
-canvas.
-\item \textbf{Coordinate Reference System} - this is a list of all projection
+\item \textbf{Enable on the fly projection}\index{Projections!enabling} -
+this checkbox is used to enable or disable OTF projection. When off, no
+projection takes place and each layer is drawn using the coordinates as read
+from the data source. When on, the coordinates in each layer are projected to
+the coordinate reference system defined for the map canvas.
+\item \textbf{Coordinate Reference System} - this is a list of all CRS
supported by QGIS, including Geographic, Projected and Custom coordinate
-systems. To use a coordinate system, select it from the list by expanding the
-appropriate node and selecting the projection. The active projection is
-preselected.
-\item \textbf{Proj4 text} - this is the projection string used by the Proj4 projection
-engine. This text is read-only and provided for informational purposes.
+reference systems. To use a CRS, select it from the list by expanding
+the appropriate node and selecting the CRS. The active CRS is preselected.
+\item \textbf{Proj4 text} - this is the CRS string used by the Proj4
+projection engine. This text is read-only and provided for informational
+purposes.
\item \textbf{Search} - if you know the EPSG identifier or the name
-for a projection, you can use the search feature to find it. Enter the
-identifier and click on \button{Find}.
+for a Coordinate Reference System, you can use the search feature to find it.
+Enter the identifier and click on \button{Find}.
\end{enumerate}
\begin{Tip}
\caption{\textsc{Project Properties Dialog}}
\qgistip{
-If you open the \dialog{Project Properties} dialog from the \mainmenuopt{Settings} menu, you
-must
-click on the \tab{Projection} tab to view the projection settings. Opening
-the dialog from the \toolbtntwo{mIconProjectionEnabled}{projector} icon will automatically bring the
-\tab{Projection} tab to the front.
+If you open the \dialog{Project Properties} dialog from the
+\mainmenuopt{Settings} menu, you must click on the \tab{Coordinate Reference
+System} tab to view the CRS settings. Opening the dialog from the
+\toolbtntwo{mIconProjectionEnabled}{projector} icon will automatically bring
+the \tab{Coordinate Reference System} tab to the front.
}
\end{Tip}
-\subsection{Custom Projections}\label{sec:customprojections}
+\subsection{Custom Coordinate Reference System}\label{sec:customprojections}
\index{Projections!custom}
-If QGIS does not provide the Coordinate Reference System (CRS) you need, you
-can define a custom projection. To define a projection, select
+If QGIS does not provide the coordinate reference system you need, you
+can define a custom CRS. To define a CRS, select
\dropmenuopttwo{mIconNew}{Custom CRS} from the \mainmenuopt{Settings} menu.
-Custom projections are stored in your QGIS user database. In addition to your
-projections, this database contains your spatial bookmarks and other custom data.
+Custom CRS are stored in your QGIS user database. In addition to your custom
+CRS, this database also contains your spatial bookmarks and other custom data.
\begin{figure}[ht]
\begin{center}
- \caption{Custom Projection Dialog \nixcaption}\label{fig:customprojections}\smallskip
+ \caption{Custom CRS Dialog \nixcaption}\label{fig:customprojections}\smallskip
\includegraphics[clip=true, width=12cm]{customProjectionDialog}
\end{center}
\end{figure}
-Defining a custom projection in QGIS requires a good understanding of the
-Proj.4 projection library. To begin, refer to the
-Cartographic Projection Procedures for the UNIX Environment - A User's Manual
-by Gerald I. Evenden, U.S. Geological Survey Open-File Report 90-284, 1990
-(available at \url{ftp://ftp.remotesensing.org/proj/OF90-284.pdf}).
+Defining a custom CRS in QGIS requires a good understanding of the Proj.4
+projection library. To begin, refer to the Cartographic Projection Procedures
+for the UNIX Environment - A User's Manual by Gerald I. Evenden, U.S.
+Geological Survey Open-File Report 90-284, 1990 (available at \url{ftp://ftp.remotesensing.org/proj/OF90-284.pdf}).
This manual describes the use of the \usertext{proj.4} and related command line
utilities. The cartographic parameters used with \usertext{proj.4} and described
in the user manual are the same as those used by QGIS.
The \dialog{Custom Coordinate Reference System Definition} dialog requires
-only two parameters to define a user projection:
+only two parameters to define a user CRS:
\begin{enumerate}
\item a descriptive name and
\item the cartographic parameters in PROJ.4 format.
\end{enumerate}
-To create a new projection, click the
-\toolbtntwo{mIconNew}{New} button and enter a descriptive
-name and the projection parameters.
-After that you can save your projektion by clicking the button
-\toolbtntwo{mActionFileSave}{Save}.
+To create a new CRS, click the \toolbtntwo{mIconNew}{New} button and enter a
+descriptive name and the CRS parameters. After that you can save your CRS by
+clicking the button \toolbtntwo{mActionFileSave}{Save}.
Note that the \guilabel{Parameters} must begin with a \usertext{+proj=}-block,
-to represent the new projection.
+to represent the new coordinate reference system.
-Figure \ref{fig:customprojections} shows
-the dialog with an example projection. The parameters shown were entered based
-on a knowledge of the projection and the information found in OF90-284.
+Figure \ref{fig:customprojections} shows the dialog with an example CRS. The
+parameters shown were entered based on a knowledge of the CRS and the
+information found in OF90-284.
-You can test your projection parameters to see if they give sane results by
+You can test your CRS parameters to see if they give sane results by
clicking on the \button{Calculate} button inside the \guiheading{Test} block
-and pasting your projection parameters into
+and pasting your CRS parameters into
the \guilabel{Parameters} field. Then enter known WGS 84 latitude and longitude
values in \guilabel{North} and \guilabel{East} fields respectively.
-Click on \button{Calculate} and compare the results with the known values in your projected coordinate
-system.
+Click on \button{Calculate} and compare the results with the known values in
+your coordinate reference system.
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