Transcript Document

GeoDAS Made Easy
-a “cheat sheet” for getting started with GeoDAS
• Intro to GeoDAS GUI and Getting Started
• Mission Planning
• Interfacing to the Sonar
• Interfacing to Meta-data Sensors
• Data Acquisition
• Real-Time Processing
• Survey Execution
• Mission Summary
GeoDAS Made Easy
March 2007
GeoDAS GUI
GRAPHICAL USER INTERFACE
Oscilloscope / Wiggle-trace Display
Navigation Panel
Current Ping Info
Menu Bar/ Tool Bar
Display Mode
Panel
Status Panel /
Logging Controls
Altitude/
Bottom
Tracking
Panel
Attitude Panel
Sidescan Panel
Subbottom/
Bathymetry
Panel
Console Text
Window
The
Waterfalls
Gain Controls
Playback Controls/ Sensor Controls
GeoDAS Made Easy
March 2007
GeoDAS GUI
GETTING STARTED
• Check disk or tape space for logging data
• Set up .param file (File menu > Setup)
•Sensor setup
•Set data logging directory
•Set Meta-data Inputs as .tic file and save
•Set all other settings
• Save setup as a .param file (helpful to save with same name as .tic file)
• Create project (carries over the .param and .tic file that was loaded during
project creation)
• ALWAYS use Survey > Close Project to close a project in order to ensure correct
settings are saved to project.
GeoDAS Made Easy
March 2007
Mission Planning
•Optional, but useful for data organization
•GeoDAS runs out of a “working directory”
•By default C:\GeoDAS
•Your project is a task-specific copy of this in C:GeoDAS\Projects
• Create a Project
(survey bookkeeping)
• Load Chart
GeoDAS Made Easy
• Create Survey
Lines
March 2007
Mission Planning
CREATE A PROJECT
• A survey’s project folder contains all files created during the course of the survey
• Select Survey menu > New Project
•Choose location on World Map: type it in, or click on map, & zoom in
•Define Project: Center Long/Lat, Width, Height, orientation, Name
NO SPACES IN THE PROJECT NAME!
• Declination window appears, write this value down! After all…
Timid Virgins Make Dull Companions; add Whiskey!
• Use Windows Explorer to verify Project was created, if you like.
GeoDAS Made Easy
March 2007
Mission Planning
LOAD CHART
• Charts can only be loaded in the
mosaic window
•Select Mosaic menu >
Display
•Select Charts menu > Load
Chart
•Select Add Chart Dir and
browse to charts folder
•Highlight the chart in the
Charts panel and click OK
•Chart is loaded in mosaic
window
GeoDAS Made Easy
March 2007
Mission Planning
CREATE SURVEY LINES
• In the Mosaic window select Waypoints menu > Waypoint Editor
• In the Survey Line Editor window select Add
*Note that if it is the first time you have created waypoints in the project you will have to select where to save
them to in the pop-up that appears after selecting the Add button.
• In the Mosaic Window select the W
waypoint to desired location.
toolbar button. Click and drag your
• Add more points in the same way until you have created your first survey
line.
GeoDAS Made Easy
March 2007
Mission Planning
CREATE SURVEY LINES
To create more survey lines….
• You can manually continue creating points and dragging them to the desired
location, then highlight the point in the Survey Line Editor, select Edit and
manually change the line to which the point belongs, then hit OK
Before
After
GeoDAS Made Easy
March 2007
Mission Planning
CREATE SURVEY LINES
OR…
• Automatically generate survey lines; there are many ways to do this which
are explained in the manual, below is a basic example…
Note that each set of
three points make a
new line
Meters between lines Angle in respect to North How many MORE lines Select when finished
choosing options
GeoDAS Made Easy
March 2007
Interfacing to the Sensor
•Interfacing and cabling
•Sensor Setup in GeoDAS
•GeoDAS
Controls
GeoDAS Made Easy
March 2007
Interfacing to the Sensor
INTERFACING AND CABLING
Tow
Cable
Cable
Reel
Deck
Cable
Interface
Control
Unit
DC
Cable
USB
Cable
User’s
PC
GPS
Power
Supply
Cable support
attachment to S-150
Cable connection to S-150
Cable attached
to Interface
Control Unit
Electric Supply
wires for
Interface
Control Unit
USB cable from Interface Control Unit to go to computer running GeoDAS
GeoDAS Made Easy
March 2007
Interfacing to the Sensor
SELECT SENSOR
• Select File menu > Setup on main GUI
• In the System panel pull down the RT Type
menu and select your sensor; S-150 for
today’s survey
• Select Sensor Setup… button
• Specify COM port to which S-150 is attached
• Choose Frequency (kHz) of sonar
• Choose Sample Rate (per channel)
sample rate
50k samples/s
= # of samples/ping*ping/sec
=
2500 * 20
• Choose Range (m) and other options
• Hit OK in the Sensor Setup: S150 window
followed by the Setup window
GeoDAS Made Easy
March 2007
Interfacing to the Sensor
CONTROLS
• Options such as Range, Gain, Channels enabled and Channel Gains can
also be chosen in the main GUI footer.
• Select the Advanced… button to access Pulse Length, Safety Depth and
Work Mode; good default values are 15 μs, 1m, and Acquire respectively.
• Select the Diagnostics button to view your Cable Voltage, Battery Voltage,
and Cable Current, when the sonar is turned on these values should be
similar to 40 V, 12-24 VDC and 0.155 amps.
• Select the Apply button when desired options are chosen.
GeoDAS Made Easy
March 2007
Interfacing to Meta-data Sensors
• GeoDAS refers to the survey data from your sensor (sidescan, multibeam,
etc.) as the “DATA”. Everything else (Navigation, heading, depths, altitude,
etc. ) we refer to as “META-DATA”.
• There are many options available to determine Meta-Data inputs
•Inputs can be supplied by an instrument or calculated from other data
streams. As an example, if you have an altimeter, this would be a good
source for sensor altitude. If not, GeoDAS can be told to calculate
altitude from the first return of the sidescan data. It is up to the user to
select the option most fitting for your setup from the Format pull down
menus.
•If the input is coming from a device then the device needs to be chosen
in the Source pull down menu to the right of the input’s Format pull down
menu.
• After all options are selected, click Accept, then click OK.
GeoDAS Made Easy
March 2007
Interfacing to Meta-data Sensors
META-DATA INPUTS
• To access navigation meta-data setup go to the Navigation menu > Setup
•First: for any Data
Item:
•Specify the Format
•Specify the Source
*Consult the GeoDAS
manual to see all format
options’ descriptions for
each data stream.
GeoDAS Made Easy
March 2007
Interfacing to Meta-data Sensors
META-DATA INPUTS
• Vessel Nav > NMEA
Uses GPS receiver position
• Sensor Nav > From Vessel Nav
Uses vessel nav and sensor offsets to
calculate sensor position
• Vessel Hdg. > From Vessel Nav
Uses vessel nav to calculate vessel hdg.
ATAN(Dy/Dx) == course!
• Sensor Hdg. > SONAR_NAV
Use “SONAR_NAV” if the sonar
supplies the data in its raw data stream
• Course > NMEA
Direction sensor is moving comes from
NMEA string
• Speed > NMEA
Speed of the sensor comes from
NMEA string
• Attitude > SONAR_NAV
Use “SONAR_NAV” if the sonar
supplies the data in its raw data stream
• Sensor Depth > SONAR_NAV
Depth data comes from sonar
• Time > NMEA
Syncs time with GPS device
GeoDAS Made Easy
March 2007
Interfacing to Meta-data Sensors
VESSEL LAYOUT CONFIGURATION
• NOTE: Sensor Nav is calculated from vessel position + sensor offsets
GeoDAS Made Easy
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Interfacing to Meta-data Sensors
META-DATA INPUTS
• Time Sync - Syncs time
in computer with that
from the source chosen
for the Time item. This
should almost always be
NMEA, so that we sync
to the navigation satellite
clock (and set TZ to
GMT!)
• Port Config… - Allows
you to setup your COM
port to the
communication setting of
the source
• Accept – Hit after EACH
option is selected!
GeoDAS Made Easy
March 2007
Interfacing to Meta-data Sensors
TEST
• Select Save to save a .tic
file containing the setup
inputs
• Press OK
• Start GeoDAS, then to
test any item, highlight its
port and press TEST
• Scrolling data in the
Sampled panel should
match the strings in the
Prototype panel.
NOTE: GeoDAS must be in Acquisition or Demo Acquisition
mode acquiring data in order for the Test to work.
GeoDAS Made Easy
March 2007
Data Acquisition
Are you logging your
acquired data?
Control and verify
data logging
GeoDAS Made Easy
March 2007
Data Acquisition
ARE YOU LOGGING?
• Sixty seconds after you start acquisition, if you are not already logging,
GeoDAS will alert you.
• You may chose to setup your logging, carry on and be warned later, carry on
and do without further warnings.
• Choose carefully…
GeoDAS Made Easy
March 2007
Data Acquisition
CONTROL AND VERIFY DATA LOGGING
• Verify logging by looking at the Logging
• Select File menu > Logging Control
on main GUI or the button on the tool panel at the top left of main GUI
bar.
Logging Off
(Can be
turned on)
• NOTE: Downsampling your data is irreversible and you
will never be able to retrieve the non-downsampled data
because it will not have been logged.
GeoDAS Made Easy
Logging On
(Can be
turned off)
March 2007
Real-Time Processing
Once you start acquiring and logging data, you
can worry about making it look good...
* because Image is everything
SNR
LUT
+ AVG
What processing
options display
your data the best?
LUT
DEF
GeoDAS Made Easy
March 2007
Real-Time Processing
BOTTOM TRACKING
• It is imperative that you know the sonar’s height above ground for any survey, this
is called its altitude. The altitude is then used in bottom-tracking.
• You must select a source for this. The best source is an altimeter if you have one.
Alternatively, you can force a manual solution, which is risky, or let GeoDAS
determine the altitude by using one of the “BOTTOM-TRACKING” algorithms. For
more details on the various algorithms to choose from, consult the manual.
-The algorithms work to detect the first return, as shown by the black lines
superimposed on the raw data in the GeoDAS oscilloscope below, giving us the
sonar’s altitude. This is important to monitor so that your sonar does not go into the
sediment and to properly apply some of the image enhancement processing routines.
Detection of 1st
real return gives
altitude
GeoDAS Made Easy
March 2007
Real-Time Processing
BOTTOM TRACKING
• Left click on the watersediment interface to help
bottom-track algorithm
find the real bottom.
• Adjust the “green gate” by
holding shift and clicking
with mouse (large gate for
large variations in altitude,
small gate for small
variations in altitude).
•Position the left green
line on water column
area; position the right
green line on confirmed
seafloor/sea bottom.
Proper bottomtracking (red
lines) is
mandatory for
safe surveying
and proper
processing
GeoDAS Made Easy
March 2007
Real-Time Processing
DEFAULT PROCESSING
• DEF refers to default real-time processing in GeoDAS. This applies a simple linear
stretch, which optionally adapts in time, allowing the user to see their data right
away in the waterfall. Advanced processing options may improve on this, but the
default processing will let you see something.
• If you know you default data range set it; otherwise leave it to 0, then GeoDAS will
calculate it from the mean.
GeoDAS Made Easy
March 2007
Real-Time Processing
IMAGE ENHANCEMENT WITH A LUT
• LUT applies a Look Up Table that maps the dynamic range of the actual
data to the dynamic range of the display. Hit the LUT button for automatic
LUT creation based on the last 200 pings of data. Note that this turns off
DEF.
GeoDAS Made Easy
March 2007
Real-Time Processing
IMAGE ENHANCEMENT WITH AVG
• AVG stands for Angle Varying Gain, its’ purpose is to normalize the image
appearance across the swath. Hit the AVG button for automatic AVG creation
based on the last 200 pings of data or hit the Create button in the AVG panel to
manually create an AVG from an area with no present objects to minimize
artifact creation. The image below has a LUT applied with an AVG. Note that
AVG can be used with DEF as well.
NOTE: You must have good bottom tracking for AVG to work properly.
After
Before
GeoDAS Made Easy
March 2007
Real-Time Processing
TARGET ENHANCEMENT WITH SNR
• SNR stands for Signal to Noise Ratio. It averages out background terrain
features enhancing target features. To efficiently utilize SNR scaling,
knowledge of target dimensions and sonar sampling rates are required. Note
it is generally not advisable to use SNR Normalization while creating
sidescan mosaics, as SNR is designed to remove the back-ground (i.e. the
geology) from the sidescan display.
Before
After
GeoDAS Made Easy
March 2007
Survey Execution
•Nav window
•Mosaic
•Targeting
•Using Waypoints
GeoDAS Made Easy
March 2007
Survey Execution
NAVIGATION DISPLAY
• Select the Navigation menu >
Display or the
button on the
tool bar.
• Zoom in/out using the
buttons.
• As you collect data observe your
coverage appear (the port side in
red and the starboard side in
green). If you do not see, this
make sure that Coverage is
checked in the Setup menu.
GeoDAS Made Easy
March 2007
Survey Execution
USING YOUR WAYPOINTS
• As you run your survey the waypoints and survey lines will change color as
follows:
•Red Waypoint
= next waypoint to hit
•Yellow line
= not yet completed line
•Blue Line
= current line
•Green Line
= completed line
• You can configure the minimum approach
distance necessary for GeoDAS to consider the
waypoint a “hit” by setting the radial distance.
To do this select in the Mosaic window the
Waypoints menu > Waypoint Editor and
select the Radius button, then set the radius in
the Radius window that appears and hit OK.
GeoDAS Made Easy
March 2007
Survey Execution
MARKING TARGETS
• Mark targets in real-time by…
•Selecting TARG mode for the
Cursor in the Display Mode
panel at the top right of main
GUI.
•Double click in middle of target
OR…
•Hold Shift and drag a box
around the target
•A Zoom window will open with
the target in it; here the user
can measure the target.
GeoDAS Made Easy
March 2007
Survey Execution
TARGET CLASSIFICATION TOOL
• Classify marked targets that are
the same object as 1 single
target…
•Each individual marking of an
object is called an
Observation.
•The GeoDAS Target
Classification Tool allows
users to group (or ungroup)
many observations of the
same object as one Target,
and calculates target
observational info (position,
size) from user specified
algorithms, observations, and
their observational info.
GeoDAS Made Easy
•Same object imaged from
opposing directions
March 2007
Survey Execution
MAKING A MOSAIC
• To open the Mosaic Setup window, open the Navigation window (if not
already opened) and select Setup menu > Mosaic Setup. This will open a
Mosaic Setup window.
• Define the region of interest, left-click and hold on the coverage map in the
navigation window, then drag the yellow box that appears, to the size of the
area you wish to mosaic. Left-click again to set the size of the yellow box.
You can right-click and hold to change the angle of the box, let go of the right
mouse button when the yellow box is at the desired angle.
GeoDAS Made Easy
March 2007
Survey Execution
MAKING A MOSAIC
• In the Mosaic Setup window…
•Name your mosaic
•Define resolution
•Define beam width
•Choose depth scale
•Check data channels, choose their
sampling and layover
•Hit Apply and OK when you are
satisfied with the selected options.
GeoDAS Made Easy
March 2007
Survey Execution
MAKING A MOSAIC
• In the Mosaic window you will
now see a red box drawn
around the region of interest.
• Start the playback of data
slowly, remembering to
carefully watch and control the
bottom tracking.
• As the data plays back and
reaches the area of interest the
user should see the processed
data start to be mosaicked in
the Mosaic window.
GeoDAS Made Easy
March 2007
Mission Summary
• The point of most surveys is to collect data that will then be used for a
separate project. For this reason it is imperative that you are able to export
and print your final mosaics, thereby creating a chart or map that someone
else can employ.
• GeoDAS allows for many different types of exports or “Mission Products”
•Any mosaic and/or targets with options of a grid overlay or background
chart
•As an image (Bitmap, BIF, GIF, JPEG, PCX, PNG, TGA, TIFF)
•As a grid (GeoTIFF, Ascii, GUTM, ERMapper)
•Google Earth .kml file
GeoDAS Made Easy
March 2007
Mission Summary
MISSION PRODUCT
• After creating a mosaic you can export it as a ready-to-print Mission Product
• In the Mosaic window go to the Export menu > Mission Products
• Options here include…
•Output Type (Sidescan, Contours, Targets, 3D Bathy)
•Area Definition
•Resolution
•Title
•Grid lines
•Grid intervals
•Chart background
•Eastings/Northings or Lat/Lon
GeoDAS Made Easy
March 2007
Mission Summary
SIDESCAN MOSAIC
• Final Mission Product of a sidescan mosaic…
GeoDAS Made Easy
March 2007
Mission Summary
TARGET MAP
• Final Mission Product of a target map...
GeoDAS Made Easy
March 2007
Mission Summary
GOOGLE EARTH EXPORT
• You can export a .kml file to be imported into Google Earth by selecting the
Export menu > Export KML in the Mosaic window.
• Then you simply name and browse to where you would like to save the file
and hit Save.
• Access the .kml file via Windows Explorer and open your Google Earth.
• Finally just drag and drop your file onto the earth and Google Earth will take
care of the rest.
GeoDAS Made Easy
March 2007
Mission Summary
GOOGLE EARTH EXPORT
• Note that you
can load and
view both
sidescan and
bathy
geo-coded
mosaics at
the same
time!
GeoDAS Made Easy
March 2007