comp.lang.idl-pvwave archive - RDF feed
type: channel
description: Messages from Usenet group comp.lang.idl-pvwave, compiled by Paulo Penteado
items: Problems with map_set

Problems with map_set
type: item
description: Hi, with IDL 4.0.1 I want to produce a map of the Antarctic region with the geomagnetic pole in the center of my plot. If I try map_set,-74.,126.,/stereo,/continents,limit=[-90.,-180.,-40. ,180.] plots,126.,-74.,psym=2 I get the map, but the center is not the geomagnetic pole. The 8-element vector for limit does also not work, because for instance the right limit data map_set,-74.,120.,/grid,/conti,limit=[-60,60,-49,120,-60,180 ,-80,300] plots,126.,-74.,psym=2 give the map with the geomagnetic pole in the center, but all latitudes higher than the -80 degrees and all the longitudes between 300 degrees and 60 degrees are not plotted. I can avoid this only if one of the limit latitudes is set to -90 degrees , but then the geomagnetic pole is not in the center anymore. Without any limit data I get the complete southern hemisphere and Antarctica is much too small. Another point is, try: map_set,-90.,120.,/grid,/azim,/conti,limit=[-90,-180,-60,180 ] and now map_set,-89.9,120.,/grid,/azim,/conti,limit=[-90,-180,-60,18 0] and now map_set,-89.9,0.,/grid,/azim,/conti,limit=[-90,-180,-60,180] Why does the map change so dramatically when I change my center-latitude from -90.0 to -89.9? And what happens when the longitude is set to 0 degrees? Any comments are welcome. Harald Frey Space Sciences Laboratory University of California Berkeley, CA 94720 hfrey@ssl.berkeley.edu
creator: Harald Frey
date: 1997-03-06T08:00:00-00:00