ArcHydro: Rastrear corriente abajo desde la entrada de drenaje

BrianAndrews

<\/HEAD>Estoy intentando usar una clase de entidad puntual que representa entradas de drenaje para rastrear automáticamente corriente abajo todos los segmentos de corriente conectados en una red ArcHydro. Estoy al tanto de la función ???trace downstream??? que requiere un punto de inicio definido por el usuario usando la herramienta azul ???add junction??? para marcar. En lugar de seleccionar manualmente cada entrada de drenaje de interés, me gustaría usar la clase de entidad puntual para rastrear automáticamente corriente abajo. ¿Alguien conoce alguna función dentro de ArcHydro que haga esto? <\/SPAN>

Gracias<\/SPAN>

BD<\/SPAN><\/BODY><\/HTML>

BrianAndrews

Hello Harry-

I am revisiting this problem using the solution you outlined below. I have a Hydro Network I generated using Arc Hydro (ver 1.4) and running ArcGIS 9.3 sp1. Could you please expand on the Use Closest Facility Analysis portion? I agree- that may the way to go, if I can get it to work!

Thanks
Brian

Hello,

I just got here from google having searched for "arcgis geometric network load flags from points". Anyway a slightly different search changing the word "points" to "file" came up with this tool:
http://edndoc.esri.com/arcobjects/8.3/Samples/Network/Utility%20Network%20Analysis/Edge%20Flags%20From%20Points/EDGEFLAGSFROMPTS.htm
which although it is apparently for Arcobjects 8.3, has loaded fine into Arcmap 10, and seems to do exactly what you are looking for.

As for me I've realised that i'm better off using Network Analyst for what i'm trying to accomplish (find routes from lots of upstream points in turn to a single downstream point). This may work better for you as well if you're tracing from all source points to the river mouth. Use a Closest Facility analysis, add the mouth / downstream point as a Facility, add all your source points as Incidents, and hit solve.

Harry