| Issue |
Fix/Work
Around |
| The processing of shapefiles,
as opposed to grids, can be extremely slow. |
This happens because the
user specified study area portion of data sets is automatically
extracted on the fly. For shapefiles (vector) this involves
clipping the shapefile to the study area, a process that is slower
the larger or more complex the shapefile.
Current work-around: Convert the shapefile
to a grid before using it as an evidential theme:
- Set the cell-size and extents for
the new grid by selecting 'Properties...' from the Analysis
menu in the View interface.
- Make the theme based on the shapefile
(a feature theme) active by clicking its legend in the table
of contents.
- Select 'Convert to Grid...' from
the Theme menu in the View interface and specify a location
and name for the new grid when prompted.
Planned fix:
Users will be able to specify whether the shapefile extents match
those of the study area or whether the shapefile requires clipping.
|
| ArcView/Spatial Analyst
hangs or crashes when a response theme is being generated using
the 'Expert Weights' option. |
There is one or more bugs
in the 'Expert Weights' option.
Current work-around:
- Calculate a response theme using
the 'regular' 'Calculate Weights...' option.
- Edit the weights table generated
by this process.
- Run the function 'Use existing weights/variances
tables...', specifying your edited weights table as input.
Planned fix:
Correct the current implementation of the expert weights option.
|
| If the user doesn't define
an analysis (output) cell size, Arc-WofE defaults to the maximum
cell size of themes input to a process. |
Define an analysis cell
size by selecting 'Properties' from the Analysis menu. If
you are unsure what cell size to specify, select 'Minimum of Inputs'.
Planned fix: The
default cell size for Arc-WofE will be modified to be the minimum
of inputs.
|
| The default classification
and symbolization of the response theme (ArcView's Natural Breaks
classification) better represents results when based on the 'Sum
of Weights' statistic than on 'Posterior Probability'. |
Planned fix:
Base the symbolization of the posterior probabilities on the natural
breaks of the sum of weights. |
