# Down Sample FilterΒΆ

The *foglamp-filter-downsample* filter is a mechanism to reduce the amount of data ingested, it allows the effective data rate to be reduced by a given factor, for example to have the data rate you select a down sample factor of 2, to get a third the rate you select a down sample factor of 3. There are a number of algorithms available to select the value to be sent.

Sample - the first value in the sample is used as the value for the sample set.

Mean - the average value in the down sampled set is sent as the down sampled value.

Median - the mathematical median value is sent as the down sampled value. This is the number found by sorting the sample and choosing the mid point of the sample.

Mode - the mathematical mode value is sent as the down sampled value. This is the number that appears most often in the sample.

Minimum - the minimum value in the sample is sent forward.

Maximum - the maximum value in the sample is sued as the sample value.

Downsample filters are added in the same way as any other filters.

Click on the Applications add icon for your service or task.

Select the

downsampleplugin from the list of available plugins.Name your downsample filter.

Click

Nextand you will be presented with the following configuration page

Configure your downsample filter

Down Sample Factor: The number of incoming values in each sample set.

Down Sample Algorithm: The algorithm used to determine the value for the sample.

Excluded Assets: A list of assets that are excluded from the down sampling process.Enable your filter and click

Done