Aerial Gamma-Ray Surveys in Alaska
Joseph S. Duval
U.S. Geological Survey Open-File Report 01-128
Tutorial for OASISmontaj
This tutorial is not meant to provide a complete discussion of the viewer software but rather to provide instructions that will assist you to begin viewing and examining the maps and data. If you are interested in learning more about the viewer software, you should install and view the tutorial provided by Geosoft (refer to the instructions for viewer installation). The first step is to run the program. To do this, click on the Windows Start-button, click on Programs, click on the folder named OASISmontaj, and click on OASIS montaj 5.0. After the program has loaded, click on File and on Open Workspace. At this point a file-open dialog will be open and you will need to navigate to the directory where you installed the data. If you accepted the default directory, the location will be
c:\Program Files\U.S. Geological Survey\Alaska Gamma-ray Data\Data.
Double click on the file named Alaska.gws. After the workspace has been loaded, you should see several maps in separate windows similar to the view shown in the figure below.
You can drag and resize the map windows as you wish. The figure below shows an annotated image of the tool bar that appears on the right side of the main window whenever you select one of the maps.
As defined by OASISmontaj, the maps have a base view and a data view. The base view contains objects such as the north arrow, the color scale, map scale, map border, and map titles. The data view contains the image of the data and various objects such as coastal boundaries, roads, and rivers. Many of the objects in the data view will not be visible when you first display a map. You can make these objects visible by clicking on the top button labeled "View/Group Manager" and you will see a window similar to that shown below.
The names of the various groups are listed in the window and those that are hidden have the icon to the left of the name grayed out. To make a group visible, select it by clicking on the name and then click on the check-box to the left of the word "Hidden". Note that you can also make an object moveable and can remove the masking but I do not recommend doing either of these things. You should NEVER delete an object because you will not be able to restore it and will have to reinstall the data. Any object that you do not wish to have on the map can be hidden. In the data view, the objects that can be hidden have PATH, AGG, or PLY as part of their names. With the exception of the AGG objects (which are images), you can also change the precedence of the objects by selecting one and then clicking on one of the buttons with the small yellow squares in the upper right part of the window. Objects that are higher in the list (excepting the AGG objects) are drawn last and thus drawn over objects below them. In general, the part of the group name that follows the underscore character is the same as the name of a grid or database (e.g. tcfilt.grd and AKrailrd.gdb).
You can enlarge any part of the map by clicking on the zoom button and then clicking and dragging within the map view to select an area of interest. You can force all of the maps to display the same area by clicking on the button labeled "All Maps". Note that you will have to make the map windows all the same size to view exactly the same area. If you wish, you can use one map as a navigation tool by selecting the button labeled "Other Maps Only". This is most useful for selecting areas for enlargement.
The shadow cursors offer you a way to identify the same location on all of the maps. If you select shadow cursors, a cursor will appear on all of the maps and will change to a new location whenever you click the left mouse button. The option to show shadow cursors with a link to a database is only useful if you have the PATH for that database plotted on the map, the PATH is visible on the map, and you have the database loaded. For the flightline database (AKfltlin.gdb), the AKTC.map is the only map that has the flightlines plotted.
To open a database or a map, click on the appropriate icon as indicated in the figure below.
When you open a database, you will see a window similar to the one shown below.
The row at the top of the window shows the line number on the left with a
listing of the fiducial numbers for each data point. The label at the top
of each data column identifies the particular data (refer to the listing
of flightline data for a description of the data columns). You can add
or remove data in the profile-plot window by right clicking in the cell with the
data identifier (e.g. TCfilt) and selecting "Show Profile" or
"Remove Profile". You can calculate the statistics for a
flightline by clicking twice with the left mouse button in the cell with the
data identifier and then clicking in that cell with the right mouse button and
selecting "Statistics". You should see
all of the data cells highlighted but NOT the title cell. If
you click three times with the left mouse button in the title cell instead of
twice, the title cell will also be highlighted and then using the right mouse
button to select "Statistics" will give you the statistics for all of
the flightlines. You can also export data in several different
formats. You should contact Geosoft,
Inc. for more information about the software. If you are interested in
how the flightlines are organized in the database, refer to the listing of flightlines
U.S. Geological Survey, a bureau of
the U.S. Department of the Interior
Last modified 16-Apr-2001 (jsd)
Contact Joe Duval
Maintained by the Eastern Publications Group