Longitude (longitude)

[ 1 Description ] [ 2 How does it work in the search window? ] [ 3 How does it work in LINQ? ]

Description

Returns the longitude value corresponding to a given geocoord.

How does it work in the search window?

This operation needs only one argument:

Argument	Data type

Argument	Data type
Geocoord ^mandatory	geocoord

The data type of the new column is float.

Example

The examples in this article use values in a data table generated from the following CSV file.

If you want to try the example by yourself, download the file and upload it to your domain by clicking Data upload in the navigation pane. Name the new table my.upload.geolocation.data and select Current date as Date parsing type. Learn more about uploading data in Uploading log files.

After receiving the confirmation message, you can access the table from the finder, selecting my → upload → geolocation → data. When you upload data from a file, all the information is included in a single column called message. To split the values into different columns, you can use the Split (split) operation. Click Query code editor in the search window toolbar and paste the following LINQ query to save time:

from my.upload.geolocation.data
select split(message, ";", 1) as geohash_strings

We want to get the longitude values corresponding to the geocoord strings in the geohash_strings column. First, we must convert the strings into geocoord data type, then use the Longitude operation to get the corresponding longitude values.

Step 1: Transform the geocoord strings into data type geocoord

First, use the Geocoord (geocoord) operation to transform the strings in the geohash_strings column into data type geocoord. Let's call the new column geocoords

Step 2: Get the latitude of the geocoords

Now, create a new column using the Longitude operation and adding the geocoords column as the argument. Call the new column longitude.

Click Create column and you will see the following result:

How does it work in LINQ?

Use the operator select... as... and add the operation syntax to create the new column. This is the syntax of the Longitude operation:

longitude(geocoord)

Example

Note that you must have uploaded this CSV file to your Devo domain as explained above to try out this example.

Copy the following LINQ script and try the above example on the my.upload.geolocation.data table.

from my.upload.geolocation.data
select split(message, ";", 1) as geohash_strings
select geocoord(geohash_strings) as geocoords,
longitude(geocoords) as longitude