Tag Archives: GIS

ArcGIS Tabulate Area Error

Several times I’ve run into an error trying to run the Tabulate Area (Spatial Analyst) tool in ArcGIS.  [I know, I know… I’m more of an open source person, but you gotta use what they’ll let you have at work.]  The error code it gives is “Error 999999 : Error executing function.”  Great.  Cuz that’s helpful.  Here are some things to check.

  1. Did you put the right layers into each input field or should the be switched?  The order matters.  The one with “zone” in the description needs to have the shapefile or raster that defines the zones you want to use.
  2. Does the attribute information you are trying to use have spaces (or special characters like commas)?  Yeah, that doesn’t work.

Now, I don’t promise that one of these is going to solve your problem, but it’s at least something to look into, which Arc doesn’t give you.  I hope someone finds this helpful.  It was intended more as a note for me, since I’ve run into and troubleshot this problem more than once this year not remembering the solution.  That’s what blogs are for!


Aerial Photography: Coal Oil Point Reserve

Recently presented with the opportunity to submit a photograph to an ecological photo contest on campus, I’ve been working on cleaning up some of my recent balloon and kite aerial photography flights.  This photo was taken with my hot air balloon rig, which is now retired due to safety concerns, a few years ago at Sands Beach at Coal Oil Point Reserve near Santa Barbara.  The site is one of the University of California’s Natural Reserves.  I’ve stitched a bunch of photos together using Hugin, then cropped the scene down to a rectangle so it would be more pleasing to the audience.  The jagged edges of the stitched scene would probably be confusing to many unfamiliar with the process.  The black squares in the image are targets that I made to help georeference the scene, something that has proven to be more difficult than most GIS analysts would suspect.


Comic: Raster vs. Vector

Who among us has NOT had one of these moments?

For all you fellow GIS geeks, this is for you!  I drew this comic sketch a few years ago after a student told me that they were confused for an entire lecture because they swore the professor was talking about “raptors” and they weren’t sure what dinosaurs had to do with GIS.

Over the years I’ve drawn many silly little comics, some of them with no plots at all.  I think I’ll post one every now and then just for fun.  I hope you enjoy them.