Latest Contributions by DanPatterson_Retired

Homework?  Or are you looking for consultants to do this work? ... View more

Output extents are set in the "environments" tab of any tool in arctoolbox ... View more

To emphasize the useage of the "in" list operand consider the following: >>> bunchOfValues = ['XY885442554', 'TY3485694873', 'RR473892711'] >>> for aValue in bunchOfValues: ...  if aValue[:2] in ['XY', 'RR']: ...      print aValue[2:] ...  else: ...      print aValue ...      885442554 TY3485694873 473892711 particularly useful to avoid extensive if, elif, else statements ... View more

Within a cursor of some form (insert possibly in your case), if the first two characters ( [0:2] ) are "XY" or "RR" are found within the offending list ["XY", "RR"], substitute/update your field/row with the value with those values removed. It is hard to debug someone else's code unless you have field calculator syntax that works before you move on to automating the process to include multiple cases.  Try to simply the operation by performing single steps at a time (eg.  strip off "XY" if it is contained within a field) then move onto the next selection finding fields that begin with "RR" and stripping those off.  If this is a one-off deal you are done...if this is daily, then generate a field calculator expression which covers all cases.   I often find the former faster than the latter and I have been coding for years. ... View more

is pseudo code avalue (a row value in string format) prefix = ["XY", "RR"] if avalue[0:2] in prefix:    avalue = avalue[2:] print avalue ... View more

the points may be surrounded by NODATA cells causing it to fail, examine your raster and your cost grid to ensure this isn't the case ... View more

See Distributions.py on our ArcGIS Online site http://carleton-u.maps.arcgis.com/home/item.html?id=076912624eaa4043bb46ef5068e12626 ... View more

are you in edit mode?  if so get out of it and try again or perhaps the field can't be edited so check its properties ... View more

http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#//00vp00000012000875.htm http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#/000584_Implementation_of_this_Tool_s_Validate_is_invalid/00vp00000015000584/ did you rule out the error messages? ... View more

I I communicated with you offline, don't use the desktop as the source and/or destination for the inputs and result.   9.2 is no longer supported ... View more

Did you check for a Save As or Export option in modelbuilder? ... View more

are you using the raster calculator (map algebra in ArcToolbox)?  if it is an integer grid you want to query for values > 1 ... View more

check the help files on the keyword "clip" which will bring you to the help topics for clipping feature and raster data ... View more

Did you check for slope tools in the 3D analyst section of ArcToolbox? ... View more

create random points, determine their convex and/or concave hull...ask your advisor what algorithms he uses 🙂  that is what they are there to do ... "advise" ... View more