If you have spreadsheet data stored in a comma-separated values text file (.csv) or data stored in a delimited text file (.txt) or GPS Exchange Format file (.gpx), you can add the data to your map. Map Viewer adds the location information, draws features on the map for each item in the file, and stores the information in the map as a layer. Once you've added your file to the map, you can edit the properties of the layer that is created. For example, you can configure pop-ups, change symbols, set the visibility range, enable editing, and remove pop-ups.
CSV and TXT files
You can add spreadsheet data from a CSV file or data from a TXT file that includes coordinate, address, or place information. To add this data as a feature layer, the file must include coordinate fields or one or more address fields. The first row must contain the location field names. If your file has coordinate fields, such as latitude and longitude fields, these are used to locate the features on the map. ArcGIS Online supports the following coordinate reference systems: longitude, latitude; latitude, longitude; Military Grid Reference System (MGRS); and United States National Grid (USNG). If your file has address or place information, or if Map Viewer cannot determine the coordinate information, you are prompted to review the location fields and change them if necessary.
The following fields are supported:
- Latitude, Longitude
- Lat, Long
- Longitude83, Latitude83
- Longdecdeg, Latdecdeg
- Long_dd, Latdd
- Y, X
- Ycenter, Xcenter
- Xcenter, Ycenter
- Point-y, Point-x
- Point-x, Point-y
You can also add a CSV file that doesn't contain location information to Map Viewer as a table. This is useful when you want to join nonspatial data—for example, property damage claims related to a recent tornado—to spatial data such as a ZIP Codes layer using the Join Features analysis tool.
Date and time in CSV files
Date fields in CSV files are assumed to contain Universal Time Coordinated (UTC) date and time. Dates are assumed to be UTC because the physical location of the server hosting your data can be anywhere in the world. The alternative of storing date and time in a local time zone leads to all sorts of problems, especially if you, or the server hosting your data, move to another time zone.
Whenever a date field is displayed, the date is converted from UTC time into your local time. This is done by querying your computer and asking it for its time zone setting. For example, suppose your computer is set to pacific time (United States and Canada). Pacific time is eight hours behind UTC except during daylight saving time—when UTC time is 10:00 AM, it is 2:00 AM pacific time.
When you publish a hosted feature layer from a CSV file, you can specify the time zone of the data. The specified time zone is used to mitigate the offset because ArcGIS Online assumes date and time data to be in UTC. For example, when a CSV file containing date fields is published with pacific time selected as the time zone, all date and time values in your CSV file will have eight or seven hours added as part of the conversion to UTC, depending on whether the date values fall within daylight savings time.
If the date fields in your CSV file contain a date but not a time value, a time value of midnight is assigned when you publish a hosted feature layer. Therefore, if you don't specify a time zone when you publish, your data will be stored with a time value of midnight (UTC). When you view the data, time will be converted to the local time, potentially changing the date. For example, 7/28/2009 0:00 is midnight (UTC) on July 28th, 2009. If you view the data from a computer in the pacific time zone, the date and time will be displayed as 7/27/2009 17:00. Specifying the time zone when you publish eliminates this offset when viewed in the time zone specified.
Supported date and time formats include the following:
M/DD/YYYY 12-hour time
7/28/2009 5:23 AM or 7/28/2009 05:23 AM
M/DD/YYYY 24-hour time
7/28/2009 5:23 or 7/28/2009 05:23
M/DD/YY 12-hour time
7/28/09 5:23 AM or 7/28/09 05:23 AM
M/DD/YY 24-hour time
7/28/09 5:23 or 7/28/09 05:23
MM/DD/YY 12-hour time
07/28/09 5:23 AM or 07/28/09 05:23 AM
MM/DD/YY 24-hour time
07/28/09 5:23 or 07/28/09 05:23
MM/DD/YYYY 12-hour time
07/28/2009 5:23 AM or 7/28/2009 05:23 AM
MM/DD/YYYY 24-hour time
07/28/2009 5:23 or 7/28/2009 05:23
Month DD, YYYY
July 28, 2009
Day of week, Month DD, YYYY
Tuesday, July 28, 2009
Day of week, Month DD, YYYY 12-hour time
Tuesday, July 28, 2009 5:23 AM or Tuesday, July 28, 2009 05:23 AM
Month DD, YYYY 12-hour time
July 28, 2009 5:23 AM or July 28, 2009 05:23 AM
Month DD, YYYY 24-hour time
July 28, 2009 5:23 or July 28, 2009 05:23
If a field configured as a date field contains an unsupported or invalid format, the field will be created as string data type in the resulting hosted feature layer.
Considerations for publishing date fields in CSV files
- The Time Zone drop-down menu appears in the Item from my computer window even if your CSV file does not contain date fields.
- When you specify a time zone when you publish a CSV file, the selected time zone is applied to all date and time values that exist in the CSV file at the time you publish or when overwriting the feature layer.
- If you want to apply a time zone only to individual records, you can specify an offset from UTC for the respective record. For example, if you had a date value of Tuesday, July 28, 2009 5:23 AM+8, that reflects a time zone that is eight hours ahead of UTC. See www.worldtimezone.com for a list of the world's time zones. When the time zone is specified per record in the CSV file, a time zone selected during publishing is applied to those records that do not have an offset specified.
- If you specify a time zone when you publish a hosted feature layer from a CSV file, overwriting the hosted feature layer with updated data maintains the time zone you selected when you originally published.
- If you alter date fields in the feature layer you published, including if you alter the hosted feature layer to use the Keep track of who created and last updated features option, the date fields capture values in the editor's local time and convert to UTC with the time offset applied.
- When you export data from a hosted feature layer for which you specified a time zone when you published, no offset is applied. Data is exported in UTC format, which effectively maintains the time zone you selected when publishing.
- Daylight saving time is automatically applied if a date value in your CSV falls within daylight saving time and the selected time zone recognizes daylight saving time.
Considerations for adding CSV and TXT files to Map Viewer
- The more address fields you include, the more accurate your geocoding results will be. For example, address and ZIP Code will yield better results than just address.
- The address field can contain multiple parts of an address (sometimes called single-line geocoding).
- Map Viewer does not support a country field. By default, it geocodes addresses based on your organization's region. You can select a different country when you add your file. If your file contains addresses from multiple countries, select World.
- Fields can be separated with a comma, semicolon, or tab. Other separators are not supported.
- When you add a CSV file directly to Map Viewer, field types are set automatically and cannot be changed. If you need to change field types, publish your CSV file as a hosted feature layer.
- Latitude and longitude information must be in decimal degrees.
- Map Viewer may not be able to create a layer from the file if the file contains more spaces than separators in the field names (the first line of the file). Remove some spaces in the field names and try adding the file again.
- Order and case does not matter (for example, you could have 519 East 86 Street, New York, NY, 10028 or new york,10028,519 east 86 street,ny.
- When you add a CSV or TXT file with coordinate information or addresses while signed in with an organizational account, 4,000 rows can be added directly to the map. CSV and TXT files with more than 4,000 rows must be published as a hosted feature layer.
- When you add a CSV or TXT file with addresses while signed in with a public account, or when you are not signed in, 250 features can be added directly to the map. CSV and TXT files with more addresses than this must be published as a hosted feature layer.
- If your data contains non-English characters, for example, characters specific to the French, Russian, Greek, Japanese, or Arabic alphabets, the file you import must be encoded as Unicode or UTF-8, and not ASCII. If you import an ASCII-encoded file containing non-English characters, it may display attribute values using unexpected characters. You can save a text file as UTF-8 or Unicode in Windows. Open the file in a text editor such as Notepad, click File > Save As, and choose UTF-8 or Unicode from the Encoding drop-down menu shown at the bottom of the Save As dialog box.
- If your CSV or TXT file is stored on a publicly accessible website and contains coordinate information, you can reference it as a layer on the web. Whenever the map is opened, it shows the latest data from your file. You can add a .csv or .txt file from the web that contains address or place information, but the file will be stored with the map. Any updates you make to the original .csv or .txt file on the web won't be reflected in the map.
- If you are adding a CSV file from the web that includes number fields with decimals, the decimal characters in your file should match the format that your system language supports. For example, if your system is set to English, your file should use periods as decimals. If you system is set to French, your file should use commas as decimals.
- When a CSV file containing latitude and longitude, MGRS, or USNG coordinates is added to a map, the coordinates are converted to the spatial reference of the current basemap.
- You can add and share a CSV file (including one with address information) as an item on the website for others to download. The file cannot be viewed with Map Viewer.
You can capture data with a GPS device and use a third-party tool or GPS manufacturer utility to convert the data to a file in GPS Exchange Format (.gpx). Once you have a GPX file, you can add it to Map Viewer to visualize the data. The following types of data are supported in Map Viewer:
- Waypoints—These are points that the GPS user recorded manually, often specifying a name, to mark locations on the map.
- Tracks—These are points the GPS device recorded automatically at a periodic interval. Tracks are rendered as linear features.
- Routes—These are points the GPS device used to navigate to a specified location. Routes are rendered as linear features.
Considerations for using GPX files
- GPX files can contain multiple layers showing waypoints, tracks, and routes.
- If no symbol is specified or if the symbol isn't part of a symbol set included in Map Viewer, a default waypoint symbol is used.
- You can add GPX files to Map Viewer, but you cannot add them as items through the My Content tab of the content page.