Harvey -- have you forced a re-calculation of statistics by using the
Process --> Calculate Statistics... option? From the main menu, use the
Process --> Calculate Statistics... option, and select the "force
recalculate stats" button; once that runs its course, re-try the various
ratios available under the TM wizard and you should be all right.
Kit.
>When I attempt to apply a ratio formula to a TM image, e.g. a clay or iron
>oxide ratio I get the following error message......Algorithm open failed
>on "": Dataset constant error: RMIN(,REGION1, INPUT1) - statistics have
>not been calculated.......any ideas on what this problem is ? Other
>formula like NDVI etc seem to work OK on the same dataset.
>
>Regards
>Harvey
>*********************************
>Harvey Collerton
>GIS Systems Manager
>School of Earth Sciences
>Victoria University of Wellington
>Ph +64 4 463 5893
>Fx +64 4 463 5186
>email: [EMAIL PROTECTED]
>***********************************
>
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