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.
Result = EOS_PT_DEFBOXREGION(pointID, cornerlon, cornerlat)
Returns the point regionID if successful and FAIL (–1) otherwise.
Point id (long) returned by EOS_PT_CREATE or EOS_PT_ATTACH.
Longitude (double) in decimal degrees of box corners (2 element, 1-D array).
Latitude (double) in decimal degrees of box corners (2 element, 1-D array).
None
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)
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5.2 |
Introduced |