在卫星地图上绘制圆形，即时测量面积和半径。结果以英亩、公顷、平方英尺等单位显示。
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The circle area is calculated using the standard formula A = πr², where r is the radius measured as the great-circle distance between the center point and edge point on the Earth surface. This accounts for the curvature of the Earth for large circles.
You can view circle area in square meters, square kilometers, hectares, acres, square feet, and square miles. The radius and circumference can be displayed in meters, kilometers, feet, or miles.
Yes! Center-pivot irrigation systems create circular fields. Enter the pivot arm length as the radius to calculate the irrigated area. A typical quarter-mile (402m) pivot irrigates about 125-130 acres (50.5 hectares).
Map measurements use the WGS84 ellipsoid model and are accurate to within a few meters for circles under 10 km radius. For very large circles, the spherical approximation may introduce small errors.
Download LandLens to measure any field or property with GPS accuracy on your phone.
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