Latest Contributions by RachelBadlan

‎03-08-2021

The reason I am lookig at wind and topography is to identify areas of terrain that have increased fire risk given certain conditions. The wind data is gridded ad we really want to identify the general direction of flow in a given area (i.e. to get an idea of blocking due to terrain). The wind doesn't have to be exact or high resolution, as the algorithm we use to identify areas of risk has a fairly large uncertainty built in and will allow fairly large variations in very local wind conditions. We just want to be able to assume the given wind direction at any wind data point to be associated with the terrain around it. Therefore given a regular grid of wind points ( 2km x 2 km - delta x and delta y), a 2 km x 2 km area of the DEM would be associated with each gridpoint (with the wind data in the centre of that square area). Hopefully this makes sense!

‎03-08-2021

Hi, I am using ArcGIS Pro to work out which areas of terrain are exposed to prevailing winds. I have a 20 m DEM (with which I have created an aspect raster) but my wind data (in degrees, direction only) is approximately 2 km resolution and in netcdf format. I have successfully added the netcdf wind data to my map and converted it to point data. (which I think is the correct step). I need to find the wind direction at every DEM point, but rather than interpolate the wind data to the high res DEM, I want to know the wind direction at the nearest wind data point to any given point. Is there a straightforward way to do this?

‎07-08-2020

Thanks! Have used the combine tool (below), but how do I remove the values of '3' (which represent areas of light purple) that are isolated? i.e. are not next to a '2' or a '4'? (See pic below for example of areas to remove and keep) Thanks in advance!

‎07-08-2020

Hi, Am new here so excuse me if my question is naive! I have a terrain-filter raster in pink and another raster filter in purple (shown overlying the first). I am only interested in the areas where the pink and purple are connected. In other words, I want to remove all the purple areas that are not associated with (adjacent to or overlayed) the pink regions, leaving just the areas where the two filters touch. I then want to merge them together to make a filter combining both (I do not need to separate the pink from the purple - I just want to identify regions where the two filters are connected. How can I achieve this?

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Date Last Visited	‎04-13-2021 08:05 PM

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Latest Contributions by RachelBadlan

Re: Finding nearest wind data point for given location

Finding nearest wind data point for given location

Re: Identify regions in common on two rasters

Identify regions in common on two rasters