Preprocesamiento Archydro solo para contornos

Question

<\/HEAD>Usuario Original: BRAVE<\/SPAN> Saludos a todos,<\/SPAN> Estoy extrayendo contornos de un DEM de 20m para usar en un mapa topográfico.<\/SPAN> Usé las herramientas 'Level DEM' y 'DEM Reconditioning' en Archydro sobre el DEM.<\/SPAN> Luego llevé el 'Agree DEM' a Globalmapper para la extracción de contornos.<\/SPAN> Quedé realmente impresionado con la mejor conformidad de los contornos con los arroyos y lagos del 'AgreeDEM' resultante.<\/SPAN> Preguntas:<\/SPAN> Dado que solo me interesa generar contornos y no cuencas hidrográficas:<\/SPAN> 1) ¿Son necesarias otras funciones como Asignar\/Quemar pendiente del arroyo, dirección del flujo, acumulación, evaluación de depresiones, etc.?<\/SPAN> 2) ¿Tendrá la eliminación de sumideros en el DEM algún efecto profundo en los contornos resultantes?<\/SPAN> Sus respuestas son bienvenidas.<\/SPAN><\/BODY><\/HTML>

Anonymous User · Answer

Original User: BRAVE

Hello,
I'm having some issues with the leveldem
The contours generated from the leveldem appear to be unnatural along the sides of the lake polygons.
They are very steep and closely spaced and gives the notion of a cliffs along the river banks.
Any help?

Anonymous User · Answer

Original User: BRAVEIf all you are doing is creating contours, my first thought is that none of the functions in Arc Hydro would improve the accuracy or quality of the contours.

However, the LevelDEM function might help if you were trying to force the lake level contours and geometry of the lake. The fill sinks function might eliminate minor dips for you and produce cleaner contour lines. If using the fill sinks function, I would limit how much fill is allowed so that you don't fill in all the features such as stock ponds that you might want to show up in the contours if you have some flat valleys. Otherwise, the other functions "artificially" modify the DEM to where you would get erroneous contours.

Thanks, this will help

Anonymous User · Answer

Original User: MBoucher21

If all you are doing is creating contours, my first thought is that none of the functions in Arc Hydro would improve the accuracy or quality of the contours.

However, the LevelDEM function might help if you were trying to force the lake level contours and geometry of the lake. The fill sinks function might eliminate minor dips for you and produce cleaner contour lines. If using the fill sinks function, I would limit how much fill is allowed so that you don't fill in all the features such as stock ponds that you might want to show up in the contours if you have some flat valleys. Otherwise, the other functions "artificially" modify the DEM to where you would get erroneous contours.