The exercise below introduces you to ADDE concepts such as dataset names, aliases, clients and servers. Use this exercise to practice adding entries to your client routing table and local server's mapping table, and displaying and copying image data from a remote server on an McIDAS-X workstation. The examples below use image datasets, but the concepts apply to all dataset types (grid, image, navigation, point and text). When you type a command, press Enter to run it. For more information about the commands, see Chapter 3, Commands and the online helps.
1. Log on to the workstation as user DEMO with project number 1234.
Logging on is required only if the ADDE remote servers you access require a user name and a project number for accounting. Administrators can allow access only to specific logon names and project numbers.
2. List your client routing table's groups and associated server IP addresses.
If this is the first time you are using the ADDE, the table is empty and the following listing is displayed.
Group Name Server IP Address |
3. Modify your client routing table so that commands requesting data from a dataset in the group BLIZZARD are routed to the Unidata remote server with the name adde.ucar.edu.
The following listing is displayed. The last line informs you that commands requesting data from a group with the Server IP Address <LOCAL-DATA> are routed to the local server
Group Name Server IP Address BLIZZARD adde.ucar.eddu <LOCAL-DATA> indicates that data will be accessed from the local data directory. |
4. List all datasets of type IMAGE in the group BLIZZARD.
The following listing is displayed. The NumPos value is the number of positions in the dataset. This data is located on the remote server at adde.ucar.edu.
5. List all the images in the dataset BLIZZARD/G7-VIS-4K.
The following listing is displayed. The Pos value is the absolute position of the image in the dataset
6. List the two most recent images (positions 0 and -1) in the dataset BLIZZARD/G7-VIS-4K.
The following listing is displayed. The Pos value is the absolute position of the image in the dataset. The image in position 3 is listed first because it is the most recent image, relative position 0. The image in position 2 is the second most recent image, relative position -1.
Image file directory listing for:BLIZZARD/G7-VIS-4K Pos Satellite/ Date Time Center Band(s) sensor Lat Lon _______ 3 GOES-7 13 MAR 93072 18:01:00 26 87 1 2 GOES-7 13 MAR 93072 17:31:00 26 87 1 |
7. Create the aliases GV4 and GI4 for the dataset names BLIZZARD/G7-VIS-4K and BLIZZARD/G7-IR-4K.
Type: AKA ADD GV4 BLIZZARD/G7-VIS-4K
Type: AKA ADD GI4 BLIZZARD/G7-IR-4K
8. List the aliases in your client routing table.
The following listing is displayed.
Alias Name Group/Descriptor GI4 BLIZZARD/G7-IR-4K GV4 BLIZZARD/G7-VIS-4K |
9. Display the most recent image in the dataset with the alias name GV4. Display the image on frame 1 centered on Athens, Georgia, and draw a map on it. The AKA listing in step 7 shows that the alias GV4 represents dataset BLIZZARD/G7-VIS-4K.
10. Assign the dataset name MYDATA/IMAGES to areas 1 through 9999 on the local server.
11. Use the IMGLIST command to find five empty areas on the local server.
If data exists in this block of areas, move or delete the areas or use the IMGLIST command to find a different block of empty areas.
12. Assign the dataset name MYDATA/TEST-IMAGES to the empty block of areas.
13. List the datasets on the local server.
A listing similar to the following is displayed.
Group/Descriptor Type Format & Range RT Comment MYDATA/IMAGES IMAGE AREA 1-9999 All areas on local server MYDATA/TEST-IMAGES IMAGE AREA 991-995 Scratch areas for testing |
14. Modify your client routing table so that commands which request data from the group MYDATA are routed to the local server.
This step is optional because ADDE commands that request data from a group not found in your client routing table are automatically routed to the local server. If you add your local server's groups to the table, you can use the DATALOC LIST command to list all the groups you can access, on local and remote servers.
15. List the groups in your client routing table.
Group Name Server IP Address BLIZZARD 128.104.109.190 MYDATA <LOCAL-DATA> <LOCAL-DATA> indicates that data will be accessed from the local data directory. |
16. Create the alias TI for the dataset name MYDATA/TEST-IMAGES.
17. List the aliases in your client routing table.
The following listing is displayed.
Alias Name Group/Descriptor GI4 BLIZZARD/G7-IR-4K GV4 BLIZZARD/G7-VIS-4K TI MYDATA/TEST-IMAGES |
18. List all the images in the dataset with the alias name TI. The AKA listing in step 17 shows that the alias TI represents dataset MYDATA/TEST-IMAGES.
The following output is displayed because the dataset has no images.
Image file directory listing for:TI IMGLIST: No images satisfy the selection criteria |
19. Copy the most recent image in the dataset with the alias name GI4 to position 5 in the dataset with the alias name TI. Place Athens, Georgia, at its center. The AKA listing in step 17 shows that the aliases GI4 and TI represent datasets BLIZZARD/G7-IR-4K and MYDATA/TEST-IMAGES.
20. List all the images in the dataset with the alias name TI.
The following listing is displayed..
Image file directory listing for:BLIZZARD/G7-VIS-4K Pos Satellite/ Date Time Center Band(s) sensor Lat Lon _______ 5 GOES-7 IR 13 MAR 93072 18:01:00 34 83 8 |
21. Display the image in position 5 in the dataset with the alias name TI. Display the image on frame 2 and draw a map on it.