Grade de Precipitação

Question

<\/HEAD>Oi, estou tentando criar uma grade de precipitação para usar como dados de entrada para o N-SPECT e gostaria de saber como proceder. Como posso criá-la se eu só tenho os dados das estações meteorológicas?<\/SPAN> Muito obrigado pelo seu tempo<\/SPAN><\/BODY><\/HTML>

MarkBoucher · Answer

You might check the PRISM site at Oregon State University for ready-made grids of the US.

I know the PRISM methodologies are extremely complex. They use regression on several variables including distance, aspect, elevation, etc.  If there was a model in ArcGIS or if the PRISM method was explained enough to use ArcGIS tools to do something similar, that would be fantastic. The Thiessen method is well know and easy to use, but it does not take orographics into account.

MohammedMzahem · Answer

yes you can use Thiessen polygons 
and create the grid shapefile.
and use the intersection tools from Analysis tools to get the data from Thiessen polygons to your grid.

KarelBrych · Answer

You have to use Thyssen polygons.