Hi everyone,
I'm running into trouble with the 'Create Fishnet' GP tool-- any immediate help would be greatly appreciated.
I realized that the units for the cell width/height inputs will be the same as those specified in the coordinate system of the output feature class. However, I've noticed that these units are measured across the planar surface when there's a projected coordinate system defined for the data frame. For example, if I create a 20 x 20 grid, in which each cell has a width/height of 2 miles, then my grid output will come out as a 40 miles by 40 miles, but ONLY when measured across a planar surface.
When I measure my fishnet grid with a geodesic measurement type, it might be 46 mi x 46 mi or whatever, depending on what PCS I'm using. Obviously, the more distorted the projection, the greater the difference between the fishnet measured across a geodesic surface and measured across a planar surface.
I'm wondering if it's possible to make it so that I can input the cell specifications according to how the output would be measured across a geodesic surface, not a planar one. So if I say cell widths are 2 mi x 2 mi, then the cells will actually be 2x2 when I measure using the geodesic measurement type.
Hope this makes sense. If someone could respond to this ASAP, it would be most appreciated.
I'm running into trouble with the 'Create Fishnet' GP tool-- any immediate help would be greatly appreciated.
I realized that the units for the cell width/height inputs will be the same as those specified in the coordinate system of the output feature class. However, I've noticed that these units are measured across the planar surface when there's a projected coordinate system defined for the data frame. For example, if I create a 20 x 20 grid, in which each cell has a width/height of 2 miles, then my grid output will come out as a 40 miles by 40 miles, but ONLY when measured across a planar surface.
When I measure my fishnet grid with a geodesic measurement type, it might be 46 mi x 46 mi or whatever, depending on what PCS I'm using. Obviously, the more distorted the projection, the greater the difference between the fishnet measured across a geodesic surface and measured across a planar surface.
I'm wondering if it's possible to make it so that I can input the cell specifications according to how the output would be measured across a geodesic surface, not a planar one. So if I say cell widths are 2 mi x 2 mi, then the cells will actually be 2x2 when I measure using the geodesic measurement type.
Hope this makes sense. If someone could respond to this ASAP, it would be most appreciated.
