What is the accuracy difference between Fixed and Float RTK?

Fixed RTK typically delivers ±8 mm horizontal and ±15 mm vertical accuracy. Float RTK carries ±300–1000 mm of positioning error depending on baseline length and atmospheric conditions.

Why does my RTK show Fixed but coordinates are still wrong?

Common causes are a datum mismatch (wrong coordinate system), an incorrect geoid model applied to elevation, or an antenna height entry error.

How do I know if multipath is affecting my survey?

Multipath typically shows as unstable repeated measurements — the same physical point measured three times gives results differing by 20–50 mm rather than the expected ±8 mm.

Can I survey during ionospheric storms?

RTK accuracy degrades during geomagnetic storms (Kp index above 5). For precision engineering or cadastral surveys, postpone sessions until the Kp index drops below 3.

What is the maximum reliable CORS baseline for centimetre accuracy?

Most CORS networks guarantee ±10–20 mm horizontal accuracy within 50 km of the nearest reference station. Beyond 70 km, deploy a self‑deployed base station within 15 km of the survey area.

APEKS FAQ | How to Use Photographic Survey with AP50 Vision

2025-07-15

How to Use Photographic Survey with AP50 Vision

Photographic surveying allows you to quickly capture data from the field using video and images. With the AP50 Vision, the process is simple, efficient, and highly visual. This step-by-step guide shows you how to perform a photographic survey and extract precise coordinates using images.

🔧 Step 1: Connect the Device

Start by connecting your controller to the AP50 Vision:

Go to the Device page and tap Communication.
Set the Model Type to AP50 Vision.
Connect to the AP50 Vision via Bluetooth.

📶 Step 2: Enter the Photographic Survey Mode

In the Survey page, tap Photographic Survey.
Connect to the AP50 Vision Wi-Fi.
Tap Photographic Survey again to enter the video recording interface.

🎥 Step 3: Record a Video and Generate Images

Record a short video clip of the target area.
The video will automatically generate photos in real time during the recording process.
To ensure enough data points, you need at least 5–10 photos.
When you're done, tap Stop to finish the recording.

📌 Step 4: Select Points for Coordinate Extraction

From the generated images, select the same point on two different photos.
The software will calculate and display the 3D coordinate of the selected point.
Tap OK to confirm and save the result.

Photographic survey with the AP50 Vision combines smart visual tools with GNSS accuracy, helping you capture field data even in challenging environments—no need to reach every point physically. It’s a great way to save time and improve safety on site.

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