# Limit Set

A limit set is a collection of weather parameters that define the operational boundaries for a mission. The limit sets are the basis for the evaluation of weather parameters within NOVA Now, Aware or Cast.

There are two types of limit sets: [Aircraft Type Limit Sets](#aircraft-type-limit-set) for inherent aircraft limitations and [Operational Limit Sets](#operational-limit-set) for limits imposed by the operation. They have different uses, but the same setup process.

## Limit Set Dialog

You can create or modify limit sets in the corresponding dialog from the [NOVA Asset Manager](/nova/assets.md#nova-asset-manager).

Parameters considered in the limit set are shown on the left side of the dialog. A searchable selection of available [parameters ](/unisphere-apis/explanatory-notes/available-parameters.md)is given on the right side. You can add parameters to the limit set using the "+" button.

<figure><img src="/files/i5U5vVgWiwEwMKHob8TK" alt=""><figcaption><p>Limit set configuration</p></figcaption></figure>

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## Aircraft Type Limit Set

The aircraft type limit set defines operational boundaries based on the aircraft specifications (aircraft spec sheet). These limits apply to a specific aircraft type (e.g. "DJI Mavic 2 Pro") and include hardware, weather, and performance-related factors that determine the aircraft's operational capabilities.

An aircraft type limit set can be assigned to an [aircraft type ](/nova/assets/aircraft-type.md)asset.

## Operational Limit Set

The operational limit set defines boundaries based on operational considerations, typically outlined in the Concept of Operations (ConOps). These limits specify the conditions under which a mission can be performed.

An operational limit set can be assigned to a [mission](/nova/missions.md).

{% hint style="info" %}
Operational limit sets may include the same parameters as aircraft type limit sets. In such cases, the NOVA evaluation algorithm automatically applies the most restrictive limits.
{% endhint %}

## Parameter Thresholds

Each weather parameter can be given thresholds that define <mark style="color:green;">**nominal**</mark>, <mark style="color:yellow;">**moderate**</mark>, or <mark style="color:red;">**severe**</mark> conditions. Nominal conditions are generally safe for flying. Moderate conditions are intermediate and require further assessment. Severe conditions are those where safe flights are not possible.

Parameter limits can be configured using four different [limit thresholds](/nova/assets/limit-set/limit-thresholds-types.md) types:&#x20;

* High-red: high values are severe
* Low-red: low values are severe
* Middle-green: both extreme values are severe with a nominal window in the middle
* Middle-red: extreme values are nominal, while a middle range is severe

Thresholds with corresponding units can be set at the transitions between value ranges.

{% hint style="warning" %}
For each parameter, Unisphere provides initial suggestions for the threshold configuration. Make sure to update these values according to your aircraft specifications or concept of operations.
{% endhint %}

## Parameter Altitude

Most parameters can be evaluated at a specific altitude, for example wind speed at 10 m above ground level. The altitude for each parameter is configured in the [Limit Set dialog](#limit-set-dialog).

To evaluate the same parameter at multiple altitudes, create separate entries for the parameter and assign a different altitude to each entry.

Altitude definitions are used for [Single-Location](/nova/missions/types/local-flight.md) and [Multi-Location](/nova/missions/types/multi-location.md) mission types. For [Route](/nova/missions/types/route.md) missions, the altitudes in the limit set are ignored and the altitude is taken directly from the [Route](/nova/assets/locations-and-routes.md#route) asset.

<figure><img src="/files/Ytf2TqZC6Y0VjfKhwd03" alt=""><figcaption><p>Same parameter used two times at different heights</p></figcaption></figure>

## Flight Phases

You can define different limits for different flight phases. For example, you may want to provide stricter wind speed limits for takeoff and landing than during the cruise phase. A parameter that you add to your limit set can be assigned for the entire mission or specifically for each phase: takeoff, en-route, and landing by selecting the corresponding tab in the limit set dialog.

<figure><img src="/files/YUSnaUUp24clTnPPeyVR" alt=""><figcaption><p>Applicable limits per phase of flight</p></figcaption></figure>


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