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How to troubleshoot Null value when using Point Inspection in MapInfo Professional

UPDATED: May 10, 2017


The Point inspection operation queries the value of the raster cell that it lies within.

The cell will either contain a valid value or it will have a value which is reserved by the raster format to represent a NULL cell. When we read the value, we first determine if it is valid or invalid (null) and if it is valid we just return the value in the cell. If it's invalid we return a flag to indicate it is Null.

Troubleshooting the null values is just a matter of reading the values in the raster at the point location and then checking if they are valid or null and returning the information for each point.

Environment Details

Products affected: MapInfo Professional 64-bit, MiRaster
 

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