Geography Reference
In-Depth Information
Figure 4.6: Grid of silver values
You'll also notice that although for a vector layer we can use the select
tools and open the attribute table, we can't do it for the grid. The only
information we can gain is the cell value.
To help Harrison with his qualitative analysis, let's identify a few cells
to get a feel for the data. The dark cells to the west (left side of the map)
are low values, 6 typically in the neighborhood of 0.2. If we look at the
brighter areas of the grid, we find values up to 3.65 or greater. So, just
by looking at the grid we can get a feel for where the higher values are,
once we know the pattern.
Using the Metadata tab in the raster properties dialog box we can get
some interesting information about the grid. If you scroll to the bottom
of the dialog box, you'll find some statistics of interest:
Property
Value
Band
Undefined
Band No
1
Min Val
-0.2643643320
Max Val
3.6971910000
6. The units on this grid are in parts per million (ppm). Nobody is going to get rich off
the silver in this grid.
 
 
Search WWH ::




Custom Search