QUICK DETERMINATION OF POSITIONS
-- On-screen indication of the sensor position, the position of a user
controlled pointer, and the position of the boat or operator. Pertinent
differential GPS status information is also displayed on-screen.
ON-SCREEN MAPPING AT SIX SCALES
primary navigation, the on-screen 2D map operates with "map elements" based on
lines of latitude and longitude. As with a navigational chart, the north-south
distance of a map element remains constant, while the east-west distance
decreases the further the survey area is from the equator. Also, as with a
navigational chart, northwest is displayed at
the top left of the screen in any hemisphere of operation. Use of the
default 0.004 scale is recommended for most marine surveys.
Individual Map Element
Use Feet Sq. at Equator Feet Sq. at Equator
Small Land Approx.
Approx. 6 0.001
Approx. 612 Approx. 12 0.002
Large Marine Approx. 1224
Approx. 24 0.004
Marine Approx. 2448
Marine Approx. 6120
Approx. 120 0.020
Extra Coarse Marine
Approx. 600 0.100
REAL-TIME 3D CHARTING AND 2D MAP-BASED PLOTTING OF ANOMALIES
-- Plotting of magnetometer-indicated peak anomalies occurs as the magnetometer
nearby, allowing for immediate and unmistakable determination of scatter patterns.
Map elements passed-through are indicated by gray octagons, making it unlikely
that unknown holes will exist in the completed survey. The larger the
gamma difference, the larger the displayed arrow pattern. Both positive
and negative peaks are accumulated and displayed. Numeric values of
positive and negative peak gamma differences are separately stored and can be
read by moving the pointer above the map
element. The separate, real-time 3D display gives a graphic, high impact
indication of the anomalies detected.
|2D/3D -- A single click instantaneously switches between display
|2D -- Positive anomalies plot as sized, white arrow patterns pointing upward.|
|2D -- Negative anomalies plot as sized, yellow arrow patterns pointing downward.|
|3D -- Positive and negative anomalies display as contoured colors.|
|3D -- Quick selection of several views.|
ON-SCREEN MAGNETOMETER GRAPH
On-screen magnetometer graph displays recent anomaly status; adjacent
windows display other pertinent magnetometer information. Audible
bell sounds can be enabled to indicate when anomalies are sensed.
EASY SURVEY STORAGE -- Plots are easily
stored to the hard-drive for future reference. The name of each stored
file includes the date and time that the file was created and stored. This
automatically sorts the files into chronological order by filename. The
.CSV files are stored in compact form. If needed, bitmap (.BMP) files
may be optionally created and stored from review mode, and offer advantages to
printing the screen (these can be displayed
and enhanced with Microsoft Paint and other similar programs). The optional .BMP
files are approximately 1.4 megabytes each.
EASY SURVEY RETRIEVAL -- Stored plots and
anomaly data can be easily retrieved from disk storage and displayed in two
|Review Mode -- This mode loads an earlier survey for analysis. If
current boat/operator position is superimposed onto the retrieved image.
efficient return to any anomaly without the use of buoys or
|Append Mode -- This mode loads an earlier survey for the purpose of
surveying areas not fully covered in the original survey. Any subsequent saving
of the new composite survey will be recorded under the new date and time, leaving
the original file undisturbed.|
EASY PRINTING OF PLOTTED MAP
2D and 3D plot can be printed to an attached color printer at any
time during survey or retrieval modes of operation.
NAVIGATIONAL ASSISTANCE -- On-screen
displays of boat/operator distance and heading to any map element beneath the
pointer allow for an easy and accurate return to any point of interest.
The magnitude of the positive and negative anomalies are also displayed for the
selected point. The vector/distance
feature can also be used to facilitate the running of grid patterns.
EFFICIENT OPERATION -- Convenient
grouping of plotting controls allows operation of the software by either
pointing device or
keyboard. This control grouping includes Zero Magnetometer, Set Origin,
Start Logging, Stop Logging, Viewing of 2D/3D chart, and Sound On/Off. this area of the screen also includes
displays of overall Magnetometer status, overall GPS status, and status of the Logging
EASY TO LEARN -- Learning MagSurvey is
made easy by the use of an on-screen manual (just click and press F1 in an area of the
screen, or select the Help menu at the top of the screen). Further help is
given by pointer-based
descriptions of displays (just park the pointer over an item). Another
manual is included (MagSurvey.doc) that may be printed using a word processing
COMMUNICATIONS SUPPORT -- A pop-up screen
can be selected to view the incoming messages from the magnetometer and GPS.
POST-PROCESSING SUPPORT -- MagSurvey's
Review mode is all that most users will ever need for survey analysis. For
users with an interest in post-processing of data or comparison to sunspot
activities logged by NASA and other agencies, MagSurvey's comma delimited .CSV
survey data file can be read by spreadsheets such as Excel. The file has
peak positive and peak negative differences, UTC times, and peak raw values; as
well as depth, altitude, and "beenhere" information for each map
element. The two raw peak values are stored as milliGammas (picoTeslas) --
all other MagSurvey values are expressed as Gammas (nanoTeslas). Header
information displays the date and time of the file save, and the latitude and longitude
of the upper left (northwest) map element. The 2601 map elements are stored row-by-row
in book form, with 51 elements across by 51 elements down. The center of
each map element at the equator is 0.004 nautical miles from the center of each adjacent
element for large-scale surveys, 0.002 nautical miles for medium-scale surveys,
and 0.001 nautical miles for small-scale surveys -- other more coarse scales are
also available. The .CSV files may also be edited with a simple text editor, such as Wordpad --
this can be useful for removing unwanted glitch readings after file save.