Record boundary puan while walking
Capture puan while walking and refine the boundary with manual corrections and closure diagnostics.
Plot Area, Perimeter, and Centroid Hesaplayıcı
Measure plot area, perimeter, and centroid in the tarayıcı from GPS puan series, manual coordinates, or local GPX / GeoJSON / KML files.
It works without a basemap, so you can switch to file import or manual girdi when the signal is weak.
Local processing
No basemap
GPS walk survey
GPX / GeoJSON / KML
HTTPS GPS
Girdi is processed in this tarayıcı and is not sent to a sunucu.
What you can do
Import local files as-is
Read GPX / GeoJSON / KML directly in the tarayıcı.
See area, perimeter, and centroid together
Review horizontal area, boundary length, centroid, and the gap between the first and last puan.
Work without a basemap
Use a sketch and puan list alone, even in çevrimdışı-like field conditions.
Export in common formats
İndirme GeoJSON, KML, GPX, CSV, or a state JSON file.
How to use
- Start GPS recording after granting location permission, or import GPX / GeoJSON / KML.
- Check puan order and closure error in the puan table, then fix the shape manually if needed.
- Review the area, perimeter, and centroid cards, then export in the format you need.
Sample
Build a 4-puan boundary from a GPS walk
Girdi
Add puan in this order: northwest, northeast, southeast, southwest, then return to the first puan
Çıktı
Area 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
Girdi
Load a polygon with an outer ring and a pond hole
Çıktı
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.
Closure error
The distance between the first and last puan. 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 puan while keeping the shape readable.
Formulas
Perimeter = sum of geodesic distances between consecutive puanClosure error = distance between the first and last puanArea = outer area - hole areaArea conversion = m² → ha / acre / km²
SSS
Can I use it without a basemap?
Yes. The sketch, puan 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 tahmins and management only. Legal boundary work requires survey sonuçlar and professional verification.
Does it calculate slope-corrected area?
The default is horizontal projeion area. DEM-based slope correction is out of scope for this version.
Which file formats are supported?
GPX / GeoJSON / KML are supported. Files are read locally in the tarayıcı.
Can I use GPS walk recording çevrimdışı?
GPS itself depends on the device and permission, but the girdi processing stays in the tarayıcı. No basemap or sunucu yükleme 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.
Notlar
- This is not a legal survey for cadastral or boundary confirmation work.
- The default area is a horizontal projeion, not a slope-corrected surface area.
- GPS accuracy can degrade under trees, in valleys, or during bad weather. Always check closure error.
- GPS walk recording requires a secure context. Use HTTPS or localhost.
- Data is processed locally. Only export files if you need to keep them.