Graph and Chart Manager
Global Mapper can produce various types of
charts and graphs, for example:
- a bar graph of the population for each country on a map,
- a pie chart comparing the total value of different types of land parcels,
- a histogram summarizing the elevations
in a grid.
Once a user has defined a graph, Global Mapper stores the definition in the workspace associated with the data. The graph or chart can be embedded in a map so that it can be printed.
To create a new graph, select the Graph and Chart
Manager... option on the Analysis
menu. Once a new graph is created, the open graph window may be docked or floating. For more information on docking see Window Docking.
Graph
and Chart Manager
The Graph and Chart Manager (below) allows the user to set up a new graph, and to see a list of the graphs defined in the current workspace.
Using the Graph and Chart Manager, a user can perform following functions:
The Graph
and Chart Manager window contains
the following UI elements and data:
List Contains the title and data layer for each graph in the current workspace.
Click on an entry in the list to select it. Only one entry can be selected
at a time.
Graph
Properties Window
The Graph
Properties Window displays the map information and options associated
with a graph definition, and a preview of the graph. This window can be
used to create a new graph and edit an existing graph definition. As the
user changes options (data layer, attributes, style, etc.) the preview
will be updated.
The Graph Properties window contains the following elements:
Properties
The Properties Section contains information used to define the graph:
General - Options that apply to the graph as a whole
Data Series - Options that apply
to the graph data
The Preview Section displays the
graph or chart, and gets updated in real time as the user changes the
definition.
General Tab
When the user clicks on the tab marked "General", the following
screen will be displayed:
The General Tab contains the following
information that applies to the graph as a whole:
Title
- This is the main
title for the graph, and is used to identify the graph on the Graph and
Chart Manager screen. Type the graph title in the associated textbox.
As the data is typed into the box, the graph preview will be updated
to reflect the change.
Show
Legend - Put a
check in this box to add a legend to the graph. When the box is
clicked, the graph preview will be updated to show or hide the legend,
depending on whether the box is checked or unchecked, respectively. Use
the Data Series tab to specify the contents of the legend.
Vertical
Alignment - Choose
an option from this list to specify the vertical component of the legend's
location. The legend can be:
- Above the graph
- Below the graph
- Aligned with the top of the graph
- Aligned with the middle of the graph
- Aligned
with the bottom of the graph
Horizontal
Alignment - Choose
an option from this list to specify the horizontal component of the legend's
location. The legend can be:
- Above the graph
- Below the graph,
- Aligned with the top of the graph
- Aligned with the middle of the graph
- Aligned
with the bottom of the graph
When the user makes a selection,
the legend on the preview will be moved to reflect the choice.
Data Series Tab
This tab contains the definition of the type
of graph and data to be used. Global Mapper can create the following types
of graphs:
Histogram
Global Mapper can create a histogram from a
Lidar data set, an attribute associated with a vector layer, or an elevation
grid. When the input data is a Lidar data set or vector layer, Global
Mapper will count the instances of each value associated with the attribute
being graphed, then group those values into bins. Each bin will
be a bar in the graph. If the value data is character data instead
of numeric, then the graph will contain a bar for each value.
When the data is an elevation layer, the elevation
values will be grouped into bins, and each bin will be a bar in the graph.
Bar Chart
A bar graph can be created from attribute data
in a vector layer or a Lidar data set. The data values in the attribute
will be summed up based on the category attribute. The X-axis will
show the categories, and the height of the bar represents the sum for
each category.
Bar Chart - Horizontal
A horizontal bar graph is similar to a bar
graph except that the Y-axis shows the categories and the length of the
bar represents the sum for each category.
Pie Chart
Global Mapper can create a pie chart from attribute
data in a vector layer or a Lidar data set. The data values in the attribute
will be summed up based on the category attribute. The size of each pie
section will represent the percentage of the total for the associated
category.
Click the Data Series tab to display the following
window: 
The Data Series tab contains the
following that applies to the data in the graph:
Type
of Graph - Select
the type of graph to be created from the following list:
- Bar Graph
- Bar Graph - Horizontal
- Histogram
- Line Graph
- Pie Chart
When a choice is made,
the preview will be updated to reflect that choice.
Source
Layer Name - Choose
the data layer that will be used to generate the graph. The list will
contain only layers that are suitable for the currently selected graph
type. If the type is Histogram, then elevation layers, Lidar layers,
and vector layers will be in the list. For all other graph types, the
list will contain only Lidar data sets and vector layers. When a
choice is made, the preview will be updated to reflect that choice.
Value Attribute - Choose the attribute used to provide values for the graph. If the user has selected an elevation layer for the source layer, then this list will be disabled. When a choice is made, the preview will be updated to reflect that choice.
Value attribute
contains numeric data - Put
a check in this box if the data in the value attribute is numeric. This
box will only be enabled when the graph type is Histogram. In all
other cases, the value attribute must contain numeric data, so this item
will be checked and disabled.
X Point
Label Attribute - Choose
the vector layer attribute that will provide the X-axis label for the
graph. This attribute value will also be used to group multiple
features into a single bar or pie section. If the user has selected
an elevation layer for the source layer, then this list will be disabled.
When a choice is made, the preview will be updated to reflect that
choice.
Data
Labels section - Contains
options related to the labels that will be attached to the graph data.
Show
labels on graph data elements - Check
the box to enable the data labels to be displayed. This item will
be disabled until the user has selected the graph type and data layer.
The preview will be updated when this option is clicked.
Label
Contents - Choose
an option that determines what data will be included in the label. Choices
are:
- Attribute and Value
- Value and Attribute
- Attribute
- Value
Attribute refers to the value associated with the attribute in the X Point
Label Attribute field. Value refers to the number used to determine the
length of the bar, size of the pie section, etc. This item will be disabled
when the check box used to show labels is not checked. When a choice
is made, the preview will be updated to reflect that choice.
Number of Bins - Type in the number of bins to be used in a Histogram. If the graph type is anything other than Histogram, this field will be disabled. The preview will be updated when a value has been entered and the user releases focus from this field by tabbing to or clicking on another field.
X-Axis
Name - Type the
name to be displayed along the X-axis. The preview will be updated
as the data is typed in.
Y-Axis
Name - Type the
name to be displayed along the Y-axis. The preview will be updated
as the data is typed in.
Legend
Title - Type
the title to be used for this data series in the legend. The preview
will be updated as the title is typed in.
Color section - Use the radio buttons in this section to choose the color scheme for the graph.
Use
default color - Check
this radio button to allow Global Mapper to choose the color for the data
series. The preview will be updated when this selection is made.
Match
color to associated feature - Check
this radio button to match the color of each graph element to its associated
feature. This option will be disabled if the graph type is Histogram.
The preview will be updated when this selection is made.
Use
custom color - Check
this radio button to choose a color to be used for the data series. The
preview will be updated when this selection is made.
Select... - Click this button to display a color selection dialog. Once the selection has been made, the rectangle to the left of the button will be updated with the selected color, and the preview will also be updated.
Advanced - Choose Horizontal angle
for graph text and the number of digits right of decimal for numeric values.
Graph
Window
The Graph Preview window contains the graph
and some controls that allow the user to work with the graph.
The Graph window contains the following UI elements and data:
Graph
- The largest area
of the window contains the graph itself.
Save
BMP Display on Map... - The
user selects the location where the BMP file will be stored, and specifies
where it should be located on the map and how large the image should be.
Cancel
- Closes the Graph
window.
Pixel Information
When the Feature
Info Toolis used to select a pixel, a Pixel Information dialog
displays the following information in a either a line or bar graph:
- Layer name
- Pixel coordinates
- Ground coordinates
- Band values
- Slope and Slope Aspect (elevation grid only)
Graph of band values
Layer - This field contains the
description of the layer that contains the pixel.
Location - Displays the coordinates
of the pixel in the global projection.
Row, Column contains the pixel
location within the raster image. If the raster is an elevation
grid, there is also an Elevation
field that contains the elevation, slope, and slope direction at the selected
pixel.
Graph Type
- This field allows the user to choose to display the graph as a bar graph
or line graph.
Bands - This section contains
a list of the values for each band in the pixel. The bands designated
as red, green, and blue will be labeled as such, and the other bands will
be labeled as “Band n”. If the user clicks on one of the lines in
the Bands list, the corresponding graph bar or point will be highlighted.
Graph - This section contains the
graph itself, and the Show point labels check box, which permits the user
to show or hide the labels that are above each bar or point in the graph.
If the graph contains a large number of points, the user has the
option of narrowing the view area to a portion of the graph, and scrolling
to see the rest. This is controlled using the Fit
data to graph window check box.
When the box is checked, all of the data will be displayed in the graph
window (the number of labels will be adjusted to make them readable.)
When the box is not checked, the view will contain a portion of
the graph, and the user will be able to scroll left and right to see the
rest. In this case, all of the labels will be displayed. See
the screen captures below for an example of the difference: