Import Control Points Wizard
To access the Import Control Points Wizard click the second button on the Control Points toolbar.
Step 1. Selecting ASCII Files to Import
NoteThe output format can only be in Shapefiles. |
- By selecting the ADD button the user can choose several ASCII files and import all of them at once.
- Select an output folder to write the new shapefiles by clicking the browse button (...) next to the box located under the Select a folder to write Shapefiles to.
- In the bottom window, you will see a preview of your file. Click Next.
Step 2. Selecting the Text Format and Start Row
- Selecting a text format and start row is the second of four steps in the process of importing ASCII.
- A text file is either delimited by a character or has fixed-width columns or fields.
- The ASCII Preview Window's sample display of the text files can be used to determine if the text files are delimited by characters or have fixed-width fields.�
- Text files may also contain a header in the file to represent field or column names.
- The start row should then be modified to skip or ignore any header rows in the text files.
- The ASCII Preview Window provides a sample display of the text files to determine if a header exists and how many lines of initial text to ignore in the text files.�
Figure 3: Selecting the text format and start row.�
Selecting the Text Format and Start Row
Complete the Step 1. Selecting ASCII Files to Import process if you have not already do so.
- On the Step 2 page, select either the Delimited or Fixed Width option for the text tiles.
Tip
Use the ASCII Preview Window's navigation tools to help determine the type of text the file contains.
Figure 4: Selecting the text format and start row. - Select the row to start the import with the clicking the Start import at line: arrow buttons or by entering the line number in the box provided.
Tip
Use the ASCII Preview Window to help determine the number of header rows to skip the text files.
Figure 5: Start import at line 4. - Click Next.
Step 3. Selecting the Delimiters for Delimited Text files
- Specifying the delimiter used in the text file is the third of four steps in the process of importing ASCII files, depending on the delimiter format selection made in Step 2.
- If the text fields in the file are separated by a fixed-width, then that selection must be made in Step 2, and a different dialog is used for Step 3 to set column widths.
- If the text files being imported are delimited by one or more characters, the characters used to separate each field must be specified here, in the Step 3 dialog of the Import Control Points Wizard.�
- Once you select the delimiter character, the ASCII Preview Window is updated with the current selection(s). A pipe symbol (|) is used in place of the actual character(s) to separate the fields in the��ASCII Preview Window.
Selecting the Delimiter�
- Complete�Step 1 and Step 2 of the ASCII file import process if you have not already done so. See ASCII Import Wizard for the list of steps.
- On the Step 3 page, click the check box(es) for the delimiter(s) used in the text files to separate each field. �If the character used to separate each field is not listed as a check box, check the Other check box and enter the character in the box.�
- Click Next.
NoteA pipe symbol (|) is used in place of the actual character to separate the fields in the ASCII Preview Window. |
Defining Columns/Fields for Fixed Width Text Files
- Defining the columns or fixed-widths in text files is the 3rd of 4th steps in the process of importing ASCII files, depending on the delimiter format selection made in Step 2.
- If the text files are separated by a delimiter, then that selection must be made in Step 2 and a different dialog is used for Step 3 to specify the delimiters used.
- If the text files are fixed width format, the width for each field in the text file must be specified here, in the Step 3 dialog of the ASCII Import Wizard.
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The ASCII Preview Window is updated as each field width is specified to guide you in determining the correct width for each field.
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Define Columns/Fields
Adding Columns and Assign Widths
- Complete Step 1 and Step 2 of the ASCII file import process if you have not already done so. See ASCII Import Wizard for the list of steps.�
- On the Step 3 page, click the Add button to create a new column for assigning a width. The new column will appear in the Columns list. �
- Select the new column in the Columns list (e.g., Column1), and then specify the Column Width using the up and down arrows to increase or decrease the width or type a value into the box.
- Repeat Step 2 and Step 3 above to create a new column and specify a width for each text field.
- Click Next.
Step 4. Defining the Fields to Import�
Defining the import fields is the fourth and final step in the process of importing ASCII files. The text files must have a minimum of X, Y, and Z fields. If the text files contain data that is not, the fields can be ignored by specifying them as Unknown (Do not import).�
- Complete Step 1 through Step 3 of the ASCII file import process if you have not already done so. See ASCII Import Wizard for the list of steps.�
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On the Step 4 page, click a field or column in the Columns list, then select the correct point attribute option on the right to assign it to the selected column. The ASCII Preview Window will update and display the selected field with the same header.�
Figure 12: - Select the next column in the list and continue assigning columns to point attributes until all fields or columns that are to be imported are assigned their correct point attributes.�
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Coordinates Reference Options. Select one of the options in the following drop-down:
No Conversion/Transformation�
The input data are in the same CRS as the Project data, so no conversion or transformation is needed.�
Figure 13: No conversion/transformation. Projection/Vertical Change Only
Only a projection and/or a vertical transformation will be applied. No datum transformation can be apply. The datum needs to be the same as the Project CRS.
Figure 14: Projection/vertical change only. Transform from ITRF2014 Geographic Coordinates
Input data are in ITRF2014 Geographic and will be transform in the project CRS (Datum and projection)
Figure 15: Transform from ITR2014 Geographic Coordinates. Generalized Transformation
Applies both datum and epoch transformations
Figure 16: Generalize transformation. - Click Finish. A new feature layer per imported file is crated containing the imported control points. The feature layer selection drop down of the Control Points toolbar is changed to the lastly imported control points layer.
NoteFor each imported file, a new feature layer is created containing the imported control points. The latest imported control points layer will be the feature layer selection drop-down of the Control Points toolbar. |
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