 |
 |
Reed, I think you can do this with raster calculator. You can use the conditional tool (named "Con") to do the comparisons you need. This link has a lot more explanations on how to use the tool. http://desktop.arcgis.com/en/arcmap/10.3/tools/spatial-analyst-toolbox/conditional-evaluation-with-con.htm If you're not actually working in ArcGIS you can definitely do these calculations in python, and I would guess there should be a similar tool in QGIS. Let me know if you have any more questions. Tracy Tracy Whelen GIS Specialist, University of Massachusetts Microwave Remote Sensing Laboratory Mount Holyoke College Class of 2014 [log in to unmask] 206-390-8759 On Thu, Jul 7, 2016 at 3:30 PM, Sims, Reed - NRCS, Colchester, VT < [log in to unmask]> wrote: > Hi, > > I have a slope Majority raster layer created using zonal statistics on a > LiDAR-derived slope map, where zones are soil map units. > > I have a raster layer that shows, for each soil map unit, the low and high > values typical of that map unit > > > > The analysis I’d like to do is to compare where the slope Majority value > of all pixels in a map unit of the first raster is outside the typical > slope range as represented by the SLOPELO and SLOPEHI values in the other > raster. It should probably check for Majority < SLOPELO or Majority > > SLOPEHI, and assign a value to the pixel based on outside or inside the > field-mapped range. > > > > My thinking is muddled on this. Is it a raster calculator exercise? Is > the DIFF function useful? Any help would be welcome. > > Reed > > > > Reed Sims | [image: cid:[log in to unmask]] USDA-NRCS | VT > State GIS Specialist | Colchester, VT | (802) 951-6796 x243 > > > > *Helping People Help the Land** | USDA is an equal opportunity employer > and provider* > > If you manage land, please consider signing up for Conservation Client > Gateway, at http://bit.ly/CGatewayVT > > > > > > > > > > > This electronic message contains information generated by the USDA solely > for the intended recipients. Any unauthorized interception of this message > or the use or disclosure of the information it contains may violate the law > and subject the violator to civil or criminal penalties. If you believe you > have received this message in error, please notify the sender and delete > the email immediately. > ------------------------------------------------------------------------- > This list (NEARC-L) is an unmoderated discussion list for all NEARC Users. > > If you no longer wish to receive e-mail from this list, you can remove > yourself by going to http://s.uconn.edu/nearcsubscribe. > ------------------------------------------------------------------------- This list (NEARC-L) is an unmoderated discussion list for all NEARC Users. If you no longer wish to receive e-mail from this list, you can remove yourself by going to http://s.uconn.edu/nearcsubscribe.