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How To: Digitize in ARCEDITW

Procedure

Summary

Tips and tricks to successfully digitize in PC ARC/INFO for Windows.

Procedure

· Digitizing in ARCEDITW

Arcs are not drawn on the screen, nor are the crosshairs visible on the screen, even though DIGTESTW produced positive results.

The Windows video interface must refresh the screen each time a NODE or VERTEX is added via the digitizer to a coverage. When sevral graphics are in a coverage, a screen refresh could take several seconds for each vertex, thereby, greatly affecting the performance of PC ARC/INFO. To avoid this, PC ARC/INFO delays the screen refresh of graphics, while adding from NODES and VERTEXES digitizer, until the you do one of two things:

1. Press the '2' button (for nodes) a second time to finish an arc. The arc will be drawn only to the last vertex. The last node will not be displayed. Once you press the '2' button (or the '0' button) again, to begin a new arc, the preceding arc will be completely drawn.

2. Press the '0' button to display the arc you just digitized. This will display through the last vertex you entered. Also, the current location of the crosshairs will be displayed on the screen. You can resume digitizing at any time by pressing the '1' or '2' buttons.

To see the digitizer crosshairs on the video screen at any time, while in the ADD mode in ARCEDITW, press the '0' button. This will display the exact position on the digitizer board. It does not matter if you are currently entering any nodes or vertexes.

· Edit coverages using WSHELL

To create a new coverage in the WSHELL, without using any existing TIC/BND files
from other coverages, do the following:

1. Start WSHELL.

2. Click FILE > CONFIGURE > DIGITIZER TEST.

3. Click FILE > COMMAND MODE.

4. Type the following at the command prompt:

Code:
ARCEDITW
DISPLAY 4
COORDINATE DIGITIZER
CREATE <new coverage name>

5. At the TIC-ID prompt, type all values from the digitizer puck or from the menu bar on the digitizer. Press the A or * button after each TIC-ID. The next button pushed after the A or * should be exactly over top of the TIC location.

6. To end TIC-ID registration, type a 0" or 0*.

7. At the prompt for the lower corner of the mapextent boundary, enter the location outside one of the lower TIC's.

8. At the prompt for an upper boundary, enter a location outside one of the TIC in the opposite corner of the lower boundary.

You may now continue your ARCEDIT session in the command mode or quit and go into the GUI ARCEDITW mode.

· Register an existing coverage using the WSHELL

1. Start WSHELL.

2. Click FILE > OPEN and select the desired coverage from the dialog box.

3. Click SPECIAL > CHECK TYPE DIGITIZER.

4. Click OK.

5. At the TIC-ID prompt, type all values from the digitizer puck or from the menu bar on the digitizer. Press the A or * button after each TIC-ID. The next button pushed after the A or * should be exactly over top of the TIC location.

6. To end TIC-ID registration, type a 0" or 0*.

7. At the prompt for the lower corner of the mapextent boundary, enter the location outside one of the lower TIC's.

8. At the prompt for an upper boundary, enter a location outside one of the TIC in the opposite corner of the lower boundary.

· Create a blank coverage with just a TIC/BND

1. Start WSHELL.

2. Click FILE > NEW/CREATE

3. Click BROWSE next to Coverage Name and navigate to the desired working directory.

4. Type the name of the new coverage, without an extension, in the Coverage Name field.

5. Click BROWSE next to TIC/BND Coverage and navigate to the desired working directory.

6. Select an existing coverage. It does not have to have a .TIC or .BND extension, you can pick a .PAT ot .AAT extension.

Follow the above procedure for registering an existing coverage using the WSHELL GUI.

· Preserve a user_ID in the WSHELL/ARCVIEW and avoid data scrambling problem

1. In ARCVIEW, add a new ITEM. For example, ID_2.

2. Calculate the ID. For example, ID_2 = cover_ID.

3. Use this ID (ID_2) for future JOINS with external databases.

4. In WSHELL, edit changes as normal. When done, click SAVE and check the appropriate feature box for the RECALC USER IDs dialog box.

In this scenario, the cover_ID will constantly change but the data will not scramble. You will use the new ITEM as the user_ID for external data base joins.