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Consultar poblaciones a las que no le llega una vía de comunicación con Geomedia

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Consultar poblaciones a las que no le llega una vía de comunicación con Geomedia

Si tenemos una base de datos geográfica que contiene diferentes clases de entidad de poblaciones (ya sean tipo área o tipo punto) y además contamos con varias clases de entidad de vías de comunicaciones (lineales) es sencillo con Geomedia y mediante una serie de consultas, obtener las poblaciones que están aisladas, sin vía de comunicación que llegue a ella, o bien con vía que le llega pero no conecta correctamente

Esta operación de control es muy útil en proyectos cartográficos y de SIG  y será una comprobación que haya que realizar en casi todo proyecto, por su carácter general

El proceso sería el siguiente:

  1. En primer lugar, si se cuenta con más de una tabla (clase de entidad) de poblaciones tipo área, poblaciones tipo punto y vías de comunicación tipo línea, será preciso unirlas en una única consulta, por el tipo de geometría. Esto se realiza en Geomedia en el menú Análisis> Unión. Se eligen las clases de entidad que se desean unir en cada consulta y se nombra cada una de ellas. En este caso se tendrían tres consultas de unión, una para las poblaciones de área, otra para las poblaciones de línea y otra para las vías de comunicación.curso-de-cartografia
  2. Después por cada consulta de unión de poblaciones se hará una nueva consulta en el menú Análisis> Consulta Espacial. Como primera entidad se seleccionará la unión de poblaciones (por ejemplo Unión_poblaciones_area) y se seleccionará la operación NOT TOUCH. En la clase de entidad siguiente se seleccionará la unión de las vías de comunicación (por ejemplo Unión_vias). Esta operación significa: “selecciona todas las entidades de área de poblaciones que no son tocadas por ninguna de las vías tipo línea”.curso-de-cartografia
  3. El resultado es una consulta en la que se recogerán todas las entidades de población a las que no llega vía de comunicación (en la imagen señaladas en azul), o que llegando, no está bien conectada a un vértice o nodo de la población correctamente.
  4. Según se va corrigiendo cada uno de los errores, este se va eliminando automáticamente de la consulta, de modo que la corrección de errores resulta muy sencilla.


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