[Geotiff] Suggested Functions for libgeotiff

[pw]

Hello,

I have suggestions for a couple functions for libgeotiff.

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  	int CPL_DLL GTIFKeyType(geokey_t keyID, tagtype_t *data_type);

	This function returns the expected type of data TYPE_SHORT,
	TYPE_ASCII, or TYPE_DOUBLE matching the supplied keyID.

PARAMETERS:
	keyID, The geokey_t name

	data_type, The returned tagtype_t that the keyID is defined as

RETURNS:
	1 if successful zero if fail.

This would make automation of using geotiff tags a lot easier.
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	int CPL_DLL GTIFGetTagSize(GTIF * gtif, geokey_t keyID, uint16* data_size);

	This function returns the data size, in bytes, of the data
	assigned to keyID in the current geotiff.

PARAMETERS:
	gtif, the GTIF

	keyID, The geokey_t name

	data_size, The returned size of the data for this tag.

RETURNS:
	1 if successful zero if fail.

This would help in the allocation of variables tag data
of different sizes including variable length strings at read time.
.................................................................


Best Regards,


Peter Willis


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