Hello! I'm trying to find out, how many trees in a region died referred to the cardinal direction of the slope. Therefore i have a contour map of the elevation of the area and a point shapefile with the location of dead trees. If I convert the the contour map to a TIN file, then i can calculate the aspect and select the dead trees based on the aspect. But I want to do it with a Grid file cause I think it's more correct. unfortunately it's not working. I can convert the contour map to a grid and i can calculate the aspect from the grid, but unfortunately it's a LOCK file or a TIF file and I can't use it to select the cardinal direction to find the amount of dead trees per cardinal direction cause there is no attribute table to open.
thanks curtvprice! In which toolbox do I find this extract tool? I found a different solution: I can convert the tif/Lock file in "conversion tools" to points ("Raster to points"). Then I have a point grid with the aspect angle. After it i can convert the point raster to voronoi polygons, which didn't worked in ArcMap so i used QGis, which worked perfectly. Now I have a polygon Grid where i can select the aspect.
thanks curtvprice! In which toolbox do I find this extract tool? I found a different solution: I can convert the tif/Lock file in "conversion tools" to points ("Raster to points"). Then I have a point grid with the aspect angle. After it i can convert the point raster to voronoi polygons, which didn't worked in ArcMap so i used QGis, which worked perfectly. Now I have a polygon Grid where i can select the aspect.
In which toolbox do I find this extract tool? I found a different solution: I can convert the tif/Lock file in "conversion tools" to points ("Raster to points"). Then I have a point grid with the aspect angle.
You get points for persistence!
You can find this tool by searching the Desktop help; "point values raster" brought up the two tools you're looking for.
Also, here's a more direct way to search for tools:
BTW - The lock file is not an image, it's a bookmark used by ArcMap to indicate that the data is open in an ArcMap layer. When you close ArcMap it is deleted.
BTW - The lock file is not an image, it's a bookmark used by ArcMap to indicate that the data is open in an ArcMap layer. When you close ArcMap it is deleted.
No, this doesn't work. I can't select the Lock or Tif file via spatial analyst --> extract values to points. But I think by transforming it back to point grid and than to voronoi polygons is also a good solution.
