---
title: DRONE SAR ALTITUDE GUIDE RESULTS (Laying Down, 40m, Slanted)
description: "Drone Search and Rescue Altitude Guide results for the following criteria: Laying Down, 40m, Slanted"
image: https://enterprise-insights.dji.com/hubfs/geospecial%20webinar%202021/DJI%20Geospatial%20Month%20Banner%201920_1080.jpg
---

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# DRONE SAR ALTITUDE GUIDE RESULTS

## Laying Down, 40m, Slanted

### YOUR SAMPLES

Visual View | Laying Down | 40m | Slanted

![40m Laying Vis 30](https://enterprise-insights.dji.com/hs-fs/hubfs/40m%20Laying%20Vis%2030.png?width=1280&name=40m%20Laying%20Vis%2030.png)

 

Thermal View (White Hot) | Laying Down | 40m | Slanted

![40m Laying WH 30](https://enterprise-insights.dji.com/hs-fs/hubfs/40m%20Laying%20WH%2030.png?width=1280&name=40m%20Laying%20WH%2030.png)

 

Thermal View (Iron Red) | Laying Down | 40m | Slanted

![40m Laying IR 30](https://enterprise-insights.dji.com/hs-fs/hubfs/40m%20Laying%20IR%2030.png?width=1280&name=40m%20Laying%20IR%2030.png)

### YOUR GUIDANCE

Length in pixels of the missing person on your smart controller screen

|   | **Length (Pixels)** |
| --- | --- |
| **Visual Camera** | 9.8 |
| **Thermal (White Hot) ** | 14.8 |
| **Thermal (Iron Red)** | 17.5 |

 

Is your probability of detection/recognition/identification above 79%*?

|   | **Detection** | **Recognition** | **Identification** |
| --- | --- | --- | --- |
| **Visual Camera** | Yes | No | No |
| **Thermal (White Hot) ** | Yes | No | No |
| **Thermal (Iron Red)** | Yes | Yes | No |

**79% was selected as the optimal probability for each type of remote sensing, as per the International Aeronautical Maritime SAR Manual.*

 

Each level of remote sensing defined:

- **Detection:** the ability to notice an object but you cannot determine the object
- **Recognition: **the ability to recognize what an object is but with minimal detail
- **Identification:** the ability to identify that an object is the object you are searching for

 

According to Johnson’s Criteria, the length of an object on your screen that is required for a 79% probability of detection/recognition/identification is:

- **Detection:** 4 pixels
- **Recognition:** 15 pixels
- **Identification: **25 pixels

##### **Recommendations for optimization**

For a missing person that is laying down, we recommend these flight parameters:

- **Camera angle:** -90o
- **Altitude:**

##### **Important Notice**

Please take these recommendations with the following caveats in mind:

- These calculations were made by using a Mavic 2EA and a smart controller screen.
- The “missing person” in these images is 5ft11 and weighs 105kg; if your missing person is smaller than that, you may want to fly lower to compensate for a smaller search object.
- The thermal images were taken when the air temperature was 5oC and the missing person’s body temperature was 36.9oC (recorded by Tympanic method); if the temperature difference is less than this, you may want to fly lower to compensate for less contrast.
- The terrain in these images is flat with vegetation at 10.3cm tall; if you are searching over hilly or mountainous terrain and/or taller vegetation, you may want to fly lower to compensate for this background clutter.

Flying speeds will also impact performance; flying too fast will cause you to miss your missing person, no matter the number of pixels. We recommend 5m/s (airspeed), it is steady and most efficient for the motors to get the best possible battery endurance.

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