27.3
The alternative coordinate method computes the area within the traverse using its x and y coordinates, which are arranged sequentially around the shape.
Each corner's coordinates are written as fractions, with the x-coordinate as the numerator and the y-coordinate as the denominator, listed horizontally in order. The first corner's fraction is repeated at the end of the sequence.
Draw solid diagonal lines connecting each x-coordinate to the next y-coordinate in sequence. Similarly, draw dashed diagonal lines connecting each y-coordinate to the next x-coordinate in the same sequence.
Calculate the solid-line contributions by multiplying each x-coordinate with the next y-coordinate.
Similarly, multiply each y-coordinate by the next x-coordinate to compute the dashed-line contributions.
Twice the area within the traverse is calculated by subtracting the total of the dashed-line products from the total of the solid-line products.
Take the absolute value of this difference and divide it by two to determine the exact area within the traverse.
This method is widely used for its simplicity, accuracy, and adaptability for manual and computer-based calculations in surveying.
El método de coordenadas alternativas, también conocido como la fórmula del cordón, es una técnica para determinar el área de una travesía mediante coordenadas cartesianas. Este método se basa en la disposición secuencial de las coordenadas x e y para cada punto de la forma, lo que garantiza la precisión y la facilidad de aplicación.
En este enfoque, las coordenadas x e y de cada esquina se enumeran como fracciones, con la coordenada x como numerador y la coordenada y como denominador. Estas coordenadas se organizan secuencialmente alrededor de la travesía, lo que garantiza que la coordenada de la primera esquina se repita al final de la secuencia para cerrar la forma.
Se dibujan líneas diagonales sólidas desde cada coordenada x hasta la coordenada y posterior, mientras que las líneas diagonales discontinuas conectan cada coordenada y con la coordenada x posterior. Los productos de estas coordenadas se calculan tanto para las líneas continuas como para las discontinuas:
Contribuciones de las líneas continuas: multiplica cada coordenada x por la coordenada y del siguiente punto de la secuencia.
Contribuciones de las líneas discontinuas: multiplica cada coordenada y por la coordenada x del vértice subsiguiente.
El área de la poligonal se obtiene restando el total de productos de las líneas discontinuas del total de productos de las líneas continuas y dividiendo la diferencia absoluta por dos:
El método de coordenadas alternativo es el preferido en topografía por su simplicidad, adaptabilidad y compatibilidad con cálculos manuales y asistidos por computadora. Su estructura sistemática minimiza los errores computacionales y ofrece una forma confiable de manejar poligonales complejas en el análisis geoespacial.
The alternative coordinate method computes the area within the traverse using its x and y coordinates, which are arranged sequentially around the shape.
Each corner's coordinates are written as fractions, with the x-coordinate as the numerator and the y-coordinate as the denominator, listed horizontally in order. The first corner's fraction is repeated at the end of the sequence.
Draw solid diagonal lines connecting each x-coordinate to the next y-coordinate in sequence. Similarly, draw dashed diagonal lines connecting each y-coordinate to the next x-coordinate in the same sequence.
Calculate the solid-line contributions by multiplying each x-coordinate with the next y-coordinate.
Similarly, multiply each y-coordinate by the next x-coordinate to compute the dashed-line contributions.
Twice the area within the traverse is calculated by subtracting the total of the dashed-line products from the total of the solid-line products.
Take the absolute value of this difference and divide it by two to determine the exact area within the traverse.
This method is widely used for its simplicity, accuracy, and adaptability for manual and computer-based calculations in surveying.
From Chapter 27:
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