Introduction to the Trimble GPS unit and the Compaq Ipaq. Setting Up

Document Sample
Introduction to the Trimble GPS unit and the Compaq Ipaq. Setting Up Powered By Docstoc
					              Introduction to the Trimble GPS unit and the Compaq Ipaq.




Setting Up:

1). Remove the plastic pen that is within the Ipaq Handheld (top left corner). This pen
can be placed on the front cover of the protective case.

2). Place the Compaq Ipaq within the Protective Case and connect the interior connecter
to the bottom of the Ipaq unit.

3).. Attach the interior communication wire to the Ipaq. The wire inside of the protective
case has a number on it. This number should be flipped around so it is not visible. Strap
the Ipaq unit in place make sure that the screen is lined up with the clear plastic screen on
the other side Place the foam on top of the straps and connect the four corner straps
down.

4). Connect the Ipaq handheld to the GPS receiver with the communication cable.

5). Connect the Antenna to the GPS Receiver and place within the Trimble Hat. The Hat
is important it allows the antenna to have a clear view of the sky without your body
getting in the way.

6). Start up the Ipaq by clicking on the button on the top right hand corner of the ipaq.
Using Arcpad™:

1.)   Tap the Start menu with the plastic pen. Select Arcpad 7.0. Click on a new and
empty map and click OK.




2). Open the cook_c_utm.sid file. (Remember
how to do this from last week?)


3.) Under the tool bar drop down menu select
GPS correct.




4). Under GPS correct select the setup menu. Click on
the logging settings. Make sure that Log GPS to SSF is
on. This will allow post processing of the data (we will
do this next week)
5). Save the map view

6). Create a New Layer, this will allow you to
create a custom GIS layer.




7.) For type select pointz(point z creates a record that
records not only the y and x coordinates but also the z
or altitude coordinate).

8). Click on the + button on the bottom left hand
corner. This will add attribute columns to you new
layer. Create a new field called Id #, and make it
numeric with 4 length and 0 Precision.




9.) Add four more new fields, called species (text 30 length), DBH (numeric 10 length 4
precision), notes(text length 100), and num_points (numeric, 3 length). Note the
precision field on the numeric data will determine how many decimal places the dataset
will hold. So data entered as 123.564 in a field that has 2 precision will record as 123.56.
Hit the OK button under the new shapefile screen, and call this shapefile
yourname_tree.shp. When it asks you if you want to create a quickform for this shapefile
selecte NO.
10.) Create a new point record by selecting the point tool
(circled in red) and then clicking on the view window. This
tool will allow you to create a new point by clicking on top
of the aerial photography.



11.) Insert fictitious information on a tree. By clicking
on the ID, SPECIES, DBH, and NOTES field.




12.) Walk next to a tree that you would like
to include within this data base. Click on the
record satellite position tool. This will
create a new point at your current gps
position (at the antenna). Fill out the
attribute information put 1 in the
num_points field (more on this later).



13.) Do this for at least four more trees

14). Point positions can also be created
by averaging a number of GPS positions
to create one point. By averaging GPS
positions a more accurate point can be
created. To do this select the GPS drop
down menu.         Click on the GPS
preferences.




15.) Scroll over to the capture menu, and
click on the enable averaging function. In
the box on the right of Points put in 10.
This will average 10 points GPS positions
for each point that you create. Repeat step 10 but change the (num_points attribute to 10).
Does it take longer to collect a point? Change the averaging to 50 and create another
point. Do different averages move the position much? Answer these questions on the
back page.




16). Create a new layer called parking lots. Make this layer a polygon layer, with only
two fields unique id (numeric) and name (text). Save this file in the main memory and
call it youname_parking.shp. When it asks you if you want to create a quickform for this
shapefile selecte NO.



17.) Go into         tool and select only the polygon layer
for editing. This will make sure that you do not
accidentally add any more data to the tree.shp file.




18.) Creating GPS logged polygon data. There are
two ways to create polygons. Either continuously
logging points (in a predetermined time) or you
could log individual vertex. Make sure that the
create polygon tool is selected (circled in red).


19). Next select the streaming vertex tool and walk
around the semi circle in front of the enr building.
20). When you have completed the semi-circle click on the         tool on the lower left
hand side. This will save the polygon that you have completed.


20.)    In the previous example the
polygon was creating a new vertex on
the polygon every 1 second. Let’s
change this to 5 seconds. Select the GPS
drop down menu and select GPS
preferences




Change the Streaming Vertices Interval from 1 second to 5 and select OK. Redo step 18.
Compare the first polygon to the second. What are the differences? Why would you want
to do this?




21.) Create a new polygon by using the individual
vertices tool. This will create a new vertex every
time you click on this tool (unlike the streaming
vertex tool). This tool works well on features that
have long straight sides (such as a square parking lot).
Walk around the ENR parking lot creating a vertex on
every corner.

Similar to creating a point each vertex can be averaged. Also, a polygon can be made up
of both streaming and individual vertex by simply selecting between the tools.

22.) Close out of arcpad.
            Global Positions Systems 11:372:374

Exercise 2
Name___________________

Are there any parts of today’s lesson that you did not understand?
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________

1) Why would you want to use the steaming vertex tool versus the capture vertex tool?
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________

2) Can you use the average function to create more accurate data using the streaming
vertex tool? Explain.
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________

3) In step 15 we averaged multiple GPS points to create one position, why would we
want to do this? Does the point appear at a different position on the map then a point
created with just one GPS fix?
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________

4)     In step 21 we created a polygon using the individual vertex tool, can you give me
two reasons why you would want to use the individual vertex tool?
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________

				
DOCUMENT INFO
Shared By:
Categories:
Stats:
views:18
posted:11/21/2008
language:English
pages:7
gregoria gregoria
About