EOS_PT_DEFBOXREGION

This function defines an area of interest for a point. It returns a point region ID which is used by the EOS_PT_EXTRACTREGION routine to read the fields from a level for those records within the area of interest.The point structure must have a level with both a Longitude and Latitude (or Colatitude) field defined.

Examples

In this example, we define an area of interest with (opposite) corners at –145 degrees longitude, –15 degrees latitude and –135 degrees longitude, –8 degrees latitude:

cornerlon = dblarr (2)

cornerlat = dblarr (2)

cornerlon[0] = -145.

cornerlat[0] = -15.

cornerlon[1] = -135.

cornerlat[1] = -8.

regionID = EOS_PT_DEFBOXREGION(pointID, cornerlon, cornerlat)

Syntax

Result = EOS_PT_DEFBOXREGION(pointID, cornerlon, cornerlat)

Return Value

Returns the point regionID if successful and FAIL (–1) otherwise.

Arguments

pointID

Point id (long) returned by EOS_PT_CREATE or EOS_PT_ATTACH.

cornerlon

Longitude (double) in decimal degrees of box corners (2 element, 1-D array).

cornerlat

Latitude (double) in decimal degrees of box corners (2 element, 1-D array).

Keywords

None

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