This map shows the 3 cells that were mosaic’ using ArcToolbox ( I could not get Arc GIS 9.3 to work) . Once I entered the expression “mosaic ([e DEM], [eDEm] etc…) the area now looks continuous. (remember… this is NOT a grid, it’s an evaluation of those rasters from a calculation.)

This is the first calculation using the Raster calculator. The expression: flowdirection([ ]) creates a raster of flow direction from each cell to its steepest downslope neighbor.

This is a view of the calculation when I edited for just the first 8 value points—WRONG!! This really didn’t make sense why I did this, so looking back I realized I needed to get the highest “count” amount –this is the 8 major pour point directions. See below.

Right!

Calculation 2 describes flow accumulation. The expression: flowaccumulation ([calculation]) shows the accumulated flow to each cell.

This is view of the flow accumulation (with color ramping changed) when I changed the DEM calculation 1 and brought calc 2 to the top of the data frame.

This is the view of watersheds, done after the 3^rd time…this really doesn’t seem right and I’m hoping once more at different site will work.

This is the last calculation prior to denoted water.

Below after minutes of computing, the watersheds are delineated. Much better1

Finally, pretty.

Location: -106.217314 34.957524 Decimal Degrees

****note: maps are taken from ERSI, GCS_Clarke_1866Datum: D_Clarke_1866

Location: top: 35.5649125, bottom: 34.6849182, left: -107.205546, right-106.046309

In reflection, this was not easy for me…lots of hours and many do overs, but I think I’m getting some of this through the gray matter (or through lots of gray hair …hmmm) . One of the most important things to rememember: DO NOT use keyboard to write in calculation (it will just make you cry with frustration.) From now on, ALWAYS use the inserted raster calculator on screen.(for everything!!, except commas)

Ok…lastly, YIKES I blew it trying to get this on web page several times…practice, practice…