Latest Contributions by DarrenWiens2

I believe you'd have to use ArcObjects to respond to such an event (choosing input/output datasets). Edit: I think you can use a Tool Validator. ... View more

Everything in Arcpy is case sensitive, so you should try: CreateFeatureclass_management ... View more

This course was great: GIS Programming 101 for ArcGIS 10 ... View more

Actually, if you want to have the coarse grid overlay your original grid, you could add the coordinates to the original table (Add XY Coordinates tool), join the nearest points to the coarse grid, export the resulting table, then use "Display XY Data..." on that table. ... View more

You have (at least) a couple of ways to do this, but you can't do if-then code unless you use the code block. 1.) Make a selection to get only the rows where [Condition] = "Seasonal". Then, use the Field Calculator, which only looks at the selected rows, to make [Canopy] = "20" (if [Canopy] is a number field, leave off the quotes). 2.) Paste this into the Field Calculator code block, when calculating the field [Canopy]: if [Condition] = "Seasonal" then result = "20" else result = null end if and type the word result into the main Field Calculator text box. You should probably look at this page for more help. ... View more

1.) Polygon to Raster tool, with cell size for your grid. 2.) Raster to Point tool, to get your point grid. ... View more

Is it OK to have the coarse grid offset from your original grid? If so, here's my suggestion: 1.) You've got your original grid (here 100m x 100m). 2.) Make a new empty raster of your area of interest (Create Constant Raster tool) with coarse cell size (here, 1000m x 1000m). Use Raster to Point tool to create a point grid. 3.) Use Spatial Join tool to give coarse grid points the attribute of the nearest point in the original grid (for whatever reason, using the Join from the feature layer right-click menu didn't work). ... View more

Oops - in my example I never gave it any commands for what to do if it was the first time around the loop, so the counter stayed at 0 and never got into the update part. Here's what it should be (you could also add an updateRow to the else part if you want the very first row to have a value - this way it will just be skipped over). for row in rows:     if count != 0: # if this isn't the first time in the loop (ie. if you have a number to subtract)         count = count + 1         row.blankcolumnname = row.MEAS - previous # make the blank column = current - previous         rows.updateRow(row) # updates the whole row, now with a value for the blank column         previous = row.MEAS # sticks the current value into the previous variable for the next time through the loop     else: # do this if it is the first time in the loop         count = 1         previous = row.MEAS ... View more

start with: import arcpy and the actual update cursor statement should be like: rows = arcpy.UpdateCursor(FILL IN YOUR PARAMETERS HERE) ... View more

rows = UpdateCursor(...) count = 0 for row in rows:     if count != 0: # if this isn't the first time in the loop (ie. if you have a number to subtract)         count = count + 1         row.blankcolumnname = row.MEAS - previous # make the blank column = current - previous         rows.updateRow(row) # updates the whole row, now with a value for the blank column         previous = row.MEAS # sticks the current value into the previous variable for the next time through the loop del row del rows # remove row locks ... View more

Can you describe what you're trying to do a little more clearly? Are you trying to resample your grid to a coarser scale? ... View more

You should use an UpdateCursor (there's an example). In the UpdateCursor statement, you specify which fields to sort. Then you loop through all your rows, each time sticking the current value into a variable to save it for the next row where you update the empty column with that value. ... View more

I believe it should be: ElseIf left([AccountInfo_PERMIT_NO],2) = "MG" Then "If the first two characters equal MG" LIKE is SQL, but you're writing VBScript. (I would normally test this before posting, but my ArcGIS is tied up) ... View more

Can you go into more detail? What are you making points from (other geometry, or are you digitizing)? ... View more

Arcpy.AddMessage() just prints the string between the (). The given example uses formatted text to make it pretty. If you only want the string in a variable called value, it would be Arcpy.AddMessage(value). ... View more