WHILE CALCULATION AN EXPRESSION HOW TO PERFORM SUMMATION WHICH IS NOT FOUND IN RASTER CALCULATOR.

WHILE CALCULATION AN EXPRESSION HOW TO PERFORM SUMMATION WHICH IS NOT FOUND IN RASTER CALCULATOR.

I mean summation of values from i=0 to i=24 (not simple addition).summation(sigma) is not found in rater calculator.

Their is no sigma...you either select and add the grids one at a time using the raster calculator or the Plus tool within a loop in a script that you will have to write.

it is an equation to find sediment delivery ratio ,where equation is exponential summation of length of i th cell divided by slope of the i th cell

Okay...You seem to be having an issue with my translation....so here are my comments and interpretations of what you need to do...

- there is no
summation for everything button... if the tool doesn't exist, then you have to*automagic*it*emulate* - you need to do the summation of part of an equation
- hence, break your workflow down into bits, one of which is summation of whatever you want the cumulative sum down
- throw the result of 3 into the equation
- any equation can be automated and scripted
- show your equation and a list of your inputs

but after summation i will get only one value right ? i need in raster form which contain details of each cell

suppose i calculate ( length / slope) value of all cells then how i get cell by cell value as in raster form

I would search the web first using

as the search key. Anything useful has probably already been done*sediment yield arcmap*

You can just download the toolbox: http://www.envsys.co.kr/~sateec/toolbox/EnvSys_SoilErosion_Toolbox_ArcGIS_ModelBuilder.zip as stated on the website (Soil Erosion / Sediment Yield ArcGIS Toolbox Kangwon National Univ. ) and if you have Spatial Analyst, you will be able to use the toolbox. No need to have a trail version.

Hi Deepa,

The issue is that the output location in the tools refer to D-drive, which is eventually not there in your system, thus the error popping up.

Go to ArcCatalog > (Locate the path of the model) > Right-click the model > Edit

In the model-builder window, double-click the tools (in orange) and define valid output file path. The default model had D-drive in path. Verify for all the tools. Also make sure you replace the DEM with the DEM file available with you. Also verify K_factor, C_factor, P_factor, and R_factor.

Let me know if the issue persists.

Thanks,

Jay

SIR FINAL I GOT 3 RASTER MAP FOR(P*R,C*K,TIMES).ACTUAL WHAT IT MEANS?DO I HAVE TO MULTIPLE THESE 3 TO GET FINAL VALUE?

- there is no

Move to the Spatial Analyst Place in order to get an answer.

Summation is accomplished using the Plus tool in ArcToolbox, spatial Analyst Tools