Mastering GIS Operations: Essential Techniques and Troubleshooting

Activating the Buffer Function in GIS

If you want to implement the buffer function and it is not active, what must you do to activate it? You must designate the units as follows:

• View -> Properties

Cartographic considerations must be made before an operation. The influence or buffer area must be activated as units are working.

Modifying Erroneous Values in a GIS Database

How can you modify an erroneous value in a database?

1. Table / Start Editing
2. With the pen tool, change the invalid data.
3. Table / Stop Editing

Deleting a Field in a GIS Database

How do you delete a field in a database?

• Edit / Delete Field

Deleting a Record in a GIS Database

How can you delete a record in a database?

• Edit / Delete Records

Invoking the Clip Command

What is required to invoke a clip command?

• File -> Extensions -> Geoprocessing
• View -> Geoprocessing Wizard

Geocoding Addresses

If the application has this command active, how do you activate it?

• Theme -> Properties -> Geocoding
• In the Address table, change the name to the working frame and the fields you will work with.

Understanding Polyline M

What does Polyline M mean?

Polyline M is a measurable line where events are located and delimited.

Adding Layers in Different Orders

Suppose you have a view with points, lines, and polygons. What problem occurs when adding a polygon layer, and how do you solve it?

When adding the polygon layer, it might be placed at the beginning of the view, covering the points and lines. To avoid this, move the polygon layer to the end of the layer list.

Performing a Join Operation

Explain the process for making a union (JOIN) of an external database with the corresponding attributes of an active theme.

• Identify the fields in both tables that are equal.
• First, choose the field in the table to which the data will be joined, and then the field in the other table.
• Click on Join.
• The aggregated data will immediately appear on the right side of the target table.

Extracting Information for a Specific Area

Explain schematically how to extract information from a set of themes for a specific area of work (e.g., water currents).

• Enable the data table.
• Perform a search for the specified area.
• Order the selected data in the table.
• Promote the selected data in the view.
• Theme -> Convert to Shapefile
• The data will be contained in a new theme.

Geocoding by Address

Explain schematically how to perform geocoding by address, assuming you have the theme and an external file containing the information for geocoding.

• Open the table that contains the data to be geocoded.
• Activate the theme. Then, go to View -> Geocode Addresses.
• In the window that appears, select the Address Table.
• Click Batch Geocoding -> Match -> Done.
• A new theme called "Geocod.shp" will be created.

Creating a New Table

Explain the general procedure for creating a new table.

In the Project window, click on Table -> New Table. A window will appear where you can specify the location to save the new table. Once done, add the necessary fields through Edit -> Add Field and the necessary records through Edit -> Add Records. Finally, stop editing.

Dynamic Segmentation and Data Integration

After dynamic segmentation, do segmented data become part of the highway on which they were segmented?

False

Troubleshooting Join Operations

Suppose you have a map of a region with its communal divisions and you join it with external data that has a common field, for instance, the names of the communes. However, after performing the join operation, only two entries are joined, and the rest are omitted. What could be the mistake?

Possible reasons for this issue include:

• Not selecting all the records.
• The join column was incorrect.
• There was an error in the join operation itself.

The JOIN command can be used in both cases.