Round coordinates (gridlatlon)
- Juan Tomás Alonso Nieto (Deactivated)
- Former user (Deleted)
Description
Rounds a given geocoord according to a grid divided depending on the given latitude and longitude precision (in degrees), or to a uniform grid with a specified number of divisions.
Latitude values → -90, 90
Longitude values → -180, 180, but as -180 and 180 represent the same point, only 180 is in this grid (see the example below).
Example of divisions in a non-uniform grid:
latitude precision = 30 → 6 divisions
-90, -60 → -75
-60, -30 → -45
-30, 0 → -15
0, 30 → 15
30, 60 → 45
60, 90 → 75
longitude precision = 90 → 4 divisions
-45, 45 → 0
45, 135 → 90
135, 180, -180, -135 → 180
-135, -45 → -90
Total grid size = 24
How does it work in the search window?
This operation needs only one argument:
Argument | Data type |
|---|---|
geocoord mandatory | geocoord |
latitude / Grid size mandatory | float / integer |
longitude mandatory | float |
The data type of the new column is geocoord.
Example
We want to represent the strings in the geocoordStrings column in the format :type:value. First, we must transform the strings to data type geocoord.
Step 1: Transform the geocoord strings into data type geocoord
First, we must transform the strings in the geocoordStrings to data type geocoord using the Geocoord (geocoord) operation. Add the geocoordStrings column as the argument. Let's call the new column geocoords.
Step 2: Round the geocoord coordinates
Now, create a new column using the Round coordinates operation and adding the geocoords column as the argument. Call the new column roundCoords. For the Grid size argument, select the pencil icon and enter a grid size using the information here.
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. These are the valid formats of the Round coordinates operation:
gridlatlon(geocoord, latitude_float, longitude_float)gridlatlon(geocoord, grid_size_integer)
Example
Copy the following LINQ script and try the above example on the my.upload.sample.data table.
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