Zapisuj punkty granicy podczas przejścia
Capture points while walking and refine the boundary with manual corrections and closure diagnostics.
Kalkulator powierzchni, obwodu i środka ciężkości działki
Measure plot area, perimeter, and centroid in the browser from GPS point series, manual coordinates, or local GPX / GeoJSON / KML files.
It works without a basemap, so you can switch to file import or manual input when the signal is weak.
Przetwarzanie lokalne
Brak mapy bazowej
Pomiar podczas przejścia GPS
GPX / GeoJSON / KML
GPS przez HTTPS
Dane wejściowe is processed in this browser and is not sent to a server.
Co możesz zrobić
Importuj lokalne pliki bez zmian
Read GPX / GeoJSON / KML directly in the browser.
Zobacz razem powierzchnię, obwód i środek ciężkości
Review horizontal area, boundary length, centroid, and the gap between the first and last point.
Pracuj bez mapy bazowej
Use a sketch and point list alone, even in offline-like field conditions.
Eksportuj w popularnych formatach
Download GeoJSON, KML, GPX, CSV, or a state JSON file.
Jak używać
- Start GPS recording after granting location permission, or import GPX / GeoJSON / KML.
- Check point order and closure error in the point table, then fix the shape manually if needed.
- Review the area, perimeter, and centroid cards, then export in the format you need.
Przykład
Build a 4-point boundary from a GPS walk
Dane wejściowe
Add points in this order: northwest, northeast, southeast, southwest, then return to the first point
Wynik
Powierzchnia is about 1.2 ha, perimeter about 450 m, and the centroid is shown too; auto-close if the closure error is within the threshold
A GeoJSON polygon with a hole
Dane wejściowe
Load a polygon with an outer ring and a pond hole
Wynik
Show the outer area minus the hole and mark the hole explicitly in the UI
Glossary
Geodesic
A calculation method that accounts for the earth's curvature when measuring distance and area.
Błąd domknięcia
The distance between the first and last point. Useful for GPS walk quality checks.
Basemap
A background map. This tool does not depend on one.
Outer ring
The outer boundary of a polygon.
Hole
An excluded area inside a boundary. It can represent a pond or empty patch.
Simplification
Reducing points while keeping the shape readable.
Formulas
Obwód = sum of geodesic distances between consecutive pointsBłąd domknięcia = distance between the first and last pointPowierzchnia = outer area - hole areaPowierzchnia conversion = m² → ha / acre / km²
FAQ
Can I use it without a basemap?
Yes. The sketch, point list, closure error, area, perimeter, and centroid are the main outputs, so it does not depend on external map SDKs or tiles.
Can I use this for legal boundary confirmation?
No. This is for field estimates and management only. Legal boundary work requires survey results and professional verification.
Does it calculate slope-corrected area?
Domyślnie używana jest powierzchnia rzutu poziomego. Korekta nachylenia oparta na DEM jest poza zakresem tej wersji.
Which file formats are supported?
GPX / GeoJSON / KML are supported. Files are read locally in the browser.
Can I use GPS walk recording offline?
GPS itself depends on the device and permission, but the input processing stays in the browser. Brak mapy bazowej or server upload is required.
Where is the data saved?
By default, location and boundary data are not saved. If you want to keep them, export JSON or GeoJSON files.
Uwagi
- To nie jest prawny pomiar do prac katastralnych ani potwierdzania granicy.
- The default area is a horizontal projection, not a slope-corrected surface area.
- Dokładność GPS może się pogarszać pod drzewami, w dolinach lub przy złej pogodzie. Zawsze sprawdzaj błąd domknięcia.
- Nagrywanie spaceru GPS wymaga bezpiecznego kontekstu. Użyj HTTPS lub localhost.
- Dane są przetwarzane lokalnie. Eksportuj pliki tylko wtedy, gdy chcesz je zachować.