-
Assuming that the editfeature has been specified, when you
-
type add, you will get one of the following menus....
-
for edit feature point....
-
for edit feature arc....
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Arcedit: editfeature arc
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Arcedit: add
-
You should get the "add arc" menu mentioned above.
-
Try adding a few arcs, experiment with the various menu options. With your
cursor in the display window, press 9 when you are done adding arcs.
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Arcedit: editfeature point
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Arcedit: add
-
You will get the "add point" menu mentioned above.
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Add at least 10 points, experiment with the various menu options.
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with your cursor in the display window, type 8 (digitizing options) from
the keyboard. This will give you a new list of options.
With your mouse cursor in the display window, Press 9 on the keyboard to
quit adding points.
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Arcedit: quit
-
to quit ArcEdit (answer Y to save changes)
Once you quit Arcedit, you will return to an Arc prompt. You should
now have the coverage named mouse in your
workspace that contains several lines and points that you added with the
mouse.
To complete the first part of this
assignment, find the command that will write the points in your coverage
to a text file of X and Y coordinates (Hint:
it is an Arc command and is the opposite of
generate). Perform the
command, and mail me the text file of coordinates (gisclass@geog.usu.edu)
Using the Digitizing Tablet
Digitizing with the tablet is also performed in ArcEdit. You will use the
same commands shown above to set up your digitizing session. The only difference
is that you will have to coordinate the digitizing
tablet to the map you are working on. Below are some additional commands
that you will need to do this ...
-
Arcedit: digitizer
<95000> </dev/ttya>
-
tells the machine that you will be using the digitizing tablet, not the
mouse.
-
Arcedit: &station <digitizer>
-
sets the display to the largest window, tells the machine that you will
be using the digitizing tablet.
-
Arcedit: create <cover>
{tic_cover}
-
use create to make a new coverage. When the digitizer is coordinated (digitizer
95000 /dev/ttya), ArcEdit will prompt you to define the coverage's tics.
-
Arcedit: coordinate <digitizer>
{cover}
-
tells ArcEdit which cover you are going to digitize. You will be prompted
for the input of the cover's tics, so that what you input on the tablet
will match up correctly with the GIS coverage.
-
Arcedit: coordinate
<mouse | digitizer>
-
switchs back to making the mouse or digitizer active.
Defining Tics for a New Coverage...
When you create a new coverage to be digitized from the tablet, you
will get the following prompt and menu, asking you to define at least 4
tics.
You should find and mark your tic locations on your map before you begin
digitizing. Enter tics by placing the crosshairs on the "puck" over the
position on the map where you wish to place a tic. First enter the tic
# from the keypad (usually, your first tic will be #1, your second #2,
etc.), then enter "A" to give the position, and "A" again to enter. When
you have entered a minimun of 4 tics, enter "0AA" from the puck to indicate
you are done entering tics.
Each time you go into ArcEdit to digitize from the tablet, you will
be prompted to enter these tics again to register your map to the GIS.
Make sure you mark them so you can enter the same locations each time.
Digitizing is performed as with the mouse. Simply type add once your
editfeature is specified and you will get one of the following menus ....
Points...
Arcs...
Move your crosshairs over the desired position and enter the appropriate
number from the digitizing puck (2
for nodes, 1 for vertices, etc). When you are done adding features,
select 9 from the puck
to get the arcedit prompt back.
To quit your ArcEdit session, type quit. To quit Arc, type quit again at
the arc prompt.
Follow through the following digitizing session using the digitizing
tablet and the Cache Ownership map provided ...
-
Arc: arcedit
-
Arcedit: &station dig
-
This will set the display and coordinate the digitizer.
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Arcedit: create cache_own
-
You will be prompted to enter at least 4 tics, enter the four tics (circled
on the map) as explained above, starting with the tic labeled "33"
and proceed clockwise.
-
You will then be prompted to define the map limits. This is done by pressing
"1" on the digitizing puck in the far south-west corner of the map and
then again in the far north-east.
-
Arcedit: editfeature arc
-
Arcedit:
drawenvironment all
-
Arcedit:
draw
-
Arcedit: add
-
You will get the "add arc" menu mentioned above.
-
Press "2" on the puck where you wish to start an arc (from node), press
"1" on the puck to add vertices, then press "2" to end the arc (to node).
Close polygons by joining from and to nodes.
-
Digitize the ownership polygons for the portion of Cache County you were
assigned. Make sure that everyone in your lab group gets a chance to digitize.
-
With the digitizing puck on the tablet, Press "9" when you are done adding
arcs.
-
Arcedit: quit
-
You will be prompted twice if you wish to save the changes to your coverage.
Type Y to both, the cover will be saved and you will get an arc prompt.
Arc: quit
to exit arc.
Getting back into your digitizing
session:
Arc:
arcedit
Arcedit: ec
owner
or whatever the coverage you created is called
Arcedit: &sta
dig
Arcedit: drawenvironment
all
Arcedit: draw
Arcedit: coord
dig owner
enter tics, etc.
To recieve credit for this
portion of the exercise, I will simply check your directory to make sure
your group has digitized this map.