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 Export Data from ApekSurv

2025-08-01

How to Export Data from ApekSurv

Whether you're a surveyor in the field or a beginner learning how to use ApekSurv, exporting your collected data is a key step in the workflow. In this post, we'll walk you through how to export your project data in .dat format and view it on your computer using Notepad.

🛠️ What You'll Need:

A data collector device with the ApekSurv app installed
A completed survey project ready for export
A USB cable to connect your device to a computer
A computer (Windows recommended)

🔄 Step-by-Step Instructions

Step 1: Open ApekSurv

Launch the ApekSurv software on your data collector.

Step 2: Go to Project Manager

Tap Project Manager, find the project you want to export, and tap Open.

Step 3: Export the Data

Once you're in the project page:

Tap Export Data
(Optional) Enter a custom Project Name for your export file
Under Choose Export File Format, select Class Format (.dat)
Choose the appropriate Distance Unit (meters, feet, etc.)
Tap Export

You'll see a reminder box:
“The file is exported successfully.”
Tap Export Path to confirm the file location:
📁 Internal Storage > ApekSurv > Export

💻 Step 4: Transfer the File to Your Computer

Connect your data collector to your PC using a USB cable
Open This PC (or My Computer)
Click on your connected device
Navigate to:
Internal Shared Storage > ApekSurv > Export
Find the file you just exported

📂 Step 5: Copy and Open the File

Copy the file to a folder on your desktop
Right-click on the file
Choose Open with > Notepad

Now you can view the exported data in plain text format. ✅

🧭 Final Tips:

Always double-check the export format before sharing the data
Keep your file names clear to avoid confusion when transferring multiple projects

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