> For the complete documentation index, see [llms.txt](https://support.senterasensors.com/65r-sensor-user-guide/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://support.senterasensors.com/65r-sensor-user-guide/sample-data/65r-vs-p1-vs-a7r4-comparison/constant-altitude.md).

# Constant Altitude

<table data-view="cards"><thead><tr><th></th><th></th></tr></thead><tbody><tr><td><img src="/files/kqsxMdpuKhr5G7C0RycZ" alt="" data-size="original"></td><td>DJI P1  </td></tr><tr><td><img src="/files/Y9PEJiLBYBC40Mhg59kC" alt="" data-size="original"></td><td>Sentera 65R </td></tr><tr><td><img src="/files/nha9OYXNQJf1SZaJO94F" alt="" data-size="original"></td><td>Sony A7R4</td></tr></tbody></table>

## Description

A constant altitude comparison of the Sentera 65R, DJI P1, and Sony A7R4. The GSD values from each sensor will vary based on their lens.&#x20;

## Flight Specifications

<table><thead><tr><th width="107">Sensor</th><th width="95">Aircraft</th><th width="105" align="center">GSD</th><th width="101" align="center">Altitude</th><th width="95" align="center">Overlap</th><th>Flight Speed</th><th width="63">RTK</th><th>Image Format</th><th>Data Volume</th><th>Number of Photos</th></tr></thead><tbody><tr><td>Sentera 65R</td><td>M300</td><td align="center">0.28in/0.72cm</td><td align="center">200ft / 60m</td><td align="center">75%</td><td>10mph</td><td>No</td><td>JPEG</td><td>12.3GB</td><td>439</td></tr><tr><td>DJI P1</td><td>M300</td><td align="center">0.30in/0.77cm</td><td align="center">200ft / 60m</td><td align="center">75%</td><td>10mph</td><td>No</td><td>JPEG<br>RAW</td><td>14.9GB<br>48.1GB</td><td>569</td></tr><tr><td>Sony A7R4</td><td>Astro</td><td align="center">0.38in/.95cm</td><td align="center">200ft / 60m</td><td align="center">75%</td><td>10mph</td><td>No</td><td>JPEG</td><td>6.6GB</td><td>280</td></tr></tbody></table>

## Camera Specifications

<table><thead><tr><th width="106">Sensor</th><th width="85" align="center">HFOV</th><th width="82" align="center">VFOV</th><th width="134" align="center">Focal Length</th><th>Resolution</th><th>Max Capture Rate</th></tr></thead><tbody><tr><td>Sentera 65R</td><td align="center">57.9</td><td align="center">45.1</td><td align="center">27mm</td><td>65MP<br>9344x7000</td><td>3 FPS</td></tr><tr><td>DJI P1</td><td align="center">54.5</td><td align="center">37.8</td><td align="center">35mm</td><td>45MP<br>8192x5460</td><td>1.5 FPS</td></tr><tr><td>Sony A7R4</td><td align="center">73.3</td><td align="center">55</td><td align="center">24mm</td><td>60MP<br>9504x6336</td><td>0.5 FPS</td></tr></tbody></table>

## Data Set Contents

* RGB Mosaic
* DSM
* Raw Images
* Stitching Report

{% hint style="info" %}
If you want to download the raw images and process yourself, download the Raw Images.zip file from each folder location.&#x20;
{% endhint %}

## Sentera 65R Data

{% embed url="<https://workdrive.zohoexternal.com/external/58e79a7c53a589541cb29eb95a1e84efb0bd4af6aaa11eb36551b5978de36ba8>" %}

## DJI P1 Data

{% embed url="<https://workdrive.zohoexternal.com/external/39e540829293539bfca0cf12b68ac5fdc6d0a592cdf48705c20382d16dc163a5>" %}

## Sony A7R4 Data

{% embed url="<https://workdrive.zohoexternal.com/external/b80619a4652dbf51479b21c155d097da779e815bcd3066790c02dfa9c2e696d6>" %}