Andrew,
I have had a bit of a go at using the API from Delphi, but just can't get
things working. The problem seems to be what the hGrid relates to in
Delphi. Can anybody provide a simple Delphi example that, for example,
opens a grid and reads a value at x,y ?
There have been a few questions regarding this on the list so I suspect I
am not alone.
Regards
Neil Moseley
[EMAIL PROTECTED]
>1. Based on the definition of these functions from the API, the size limit
>appears to be about 2,147,483,648 x 2,147,483,648, but I'm sure practical
>limitations become apparent long before that.
>
> BOOL GRIDENGFUNCTION GE_GetContinuousValue(GE_HGRID hGrid,
> long lCol, long lRow, double *pdValue, unsigned char *puchIsNull);
>
> BOOL GRIDENGFUNCTION GE_GetDimensions(GE_HGRID hGrid, long *plWidth,
> long *plHeight);
>
> BOOL GRIDENGFUNCTION GE_WriteContinuousValue(GE_HGRID hGrid,
> long lCol, long lRow, double dValue);
>
>2. No, the IDW algorithm is just one way to create a grid file.
>
>3. I know that ESTI-Map in Moscow has written a TIN-based interpolator,
> and Mercator Geosystems has others.
>
>4. MapInfo Professional 5.5 (and now 6.0) includes a DEM2GRID utility.
>
>The complete API for the Grid Engine is available upon request.
>
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