Routines (alphabetical) > Routines: H > HDF-EOS Routines > EOS_QUERY

# EOS_QUERY

The EOS_QUERY function returns information about the makeup of an HDF-EOS file.

## Syntax

Result = EOS_QUERY( Filename, [Info] )

## Return Value

This function returns integer value of 1 if the file is an HDF file with EOS extensions, and 0 otherwise.

## Arguments

### Filename

A scalar string containing the name of the file to query.

### Info

Returns an anonymous structure containing information about the contents of the file. The returned structure contains the following fields:

Field | IDL Data Type | Description
GRID_NAMES | String | Comma-delimited string containing the names of grids
NUM_GRIDS | Long | Number of grids in file
NUM_POINTS | Long | Number of points in file
NUM_SWATHS | Long | Number of swaths in file
POINT_NAMES | String | Comma-delimited string containing the names of points
SWATH_NAMES | String | Comma-delimited string containing the names of swaths

## Version History

5.3 | Introduced