If the information in your delimited text files is displaying correctly, you can choose to leave the schema.ini file. In this case, a schema.ini file will be created containing the presumed format of the field. There is one instance in which a schema.ini file will be created by ArcGIS when opening a delimited text file: when the format for a certain field cannot be reliably determined. However, if a schema.ini is present, ArcGIS will honor the settings specified in a schema.ini file to determine how the text file should be displayed. As opposed to previous releases, schema.ini files, which are used by the Microsoft ODBC Text Driver for storing data description information, are not required for displaying delimited text file information in ArcGIS. Overriding how text files are formattedĪrcGIS uses its own implementation for accessing delimited text file information and should handle the most common cases for displaying these files in ArcGIS. You should edit the field names in delimited text files to remove any single double quotes and either remove them or replace them with another character. The only character that is not supported is a single double quote. See the Field Names section under Defining fields in tables. Field namesįield names for ASCII and text files follow the same conventions as field names for geodatabase feature classes. If you need to display the contents of the text file in a format other than Decimal Degrees, you will need to use the Convert Coordinate Notation tool to convert the coordinate information. A list of them, including a detailed description of the supported notation, is available in Supported Notation Formats. ArcGIS supports numeric information stored within text files in many different formats. For example, if you have two text fields called Lat and Lon, when opening the text file, you will see four fields called Lat, Lon, Lat _D, and Lon_D. In the case of double-field fields, such as Lat/Lon, when these fields are identified as text fields, ArcGIS will maintain the original fields and add two new fields to contain the converted Decimal Degree coordinate information. For example, if you have a text field called UTM, when opening the text file, you will see three fields called UTM, UTM_X, and UTM_Y. In the case of single-field formats, such as UTM, ArcGIS will maintain the original UTM field but add two additional fields appended with _X and _Y and display the coordinate information in Decimal Degrees. If this is the case, such as when the coordinate information is stored within a text field or is stored in degrees, minutes, and seconds (for example, -120 13 58), the information will be converted and displayed to you in Decimal Degrees (DD) for use in ArcGIS. This won't always be the case and, in many instances, the information you want to use within ArcGIS may be stored in any number of different formats. In the example above, the coordinate information was straightforward and easy to recognize it was contained in fields called x and y. If your delimited text file contains data coordinate information, such as x,y data, ArcGIS will recognize the coordinate information as numeric fields which can be used to either display your information as a layer or as input to tasks, such as geocoding. This can be previewed in ArcCatalog or added as data in ArcMap and will appear as shown: How coordinate information is determined The following is an example of a comma-delimited text file: Remember to use commas or tabs to distinguish the columns. The following rows can contain coordinates and attributes. The first row of your text file can contain the column headings. This will help differentiate text files with delimited data from unformatted text files. To avoid this problem, give your delimited text files a. If you attempt to display a text file that doesn't contain tabular data, the software will either produce an error or attempt to display the data as a table. Any file with one of these extensions will be interpreted as a text file table even if it doesn't contain tabular data. tab extension are interpreted as tab delimited by default. csv extension are interpreted as comma delimited, while files with a. tab extensions and assign them a file type of text file.įiles with a. ArcCatalog and the Add Data dialog box in ArcMap list files with. In ArcGIS, you can directly access data in delimited text files and work with them as tables.
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