comp.lang.idl-pvwave archive: archive » mapping data & grid (MAP_SET MAP

Home » Public Forums » archive » mapping data & grid (MAP_SET MAP_GRID)

Show: Today's Messages :: Show Polls :: Message Navigator
E-mail to friend

mapping data & grid (MAP_SET MAP_GRID) [message #18703]

Wed, 02 February 2000 00:00

Kenneth Mankoff
Messages: 42
Registered: August 1999

Member

Hi all,
i'm making global images, with grids, according to the following
instructions:

1. draw the globe on the screen so that the _geomagnetic_ pole is
centered.
2. draw the grids according to the _geographic_ poles.

The code i use is the following:
;;; data is a 2d array, sorted on latitude and longitude.
;;; the geomagnetic pole in the north is at (82, -90), for 1999.
MAP_SET, 82, -90, /ortho
img = MAP_PATCH(data, xstart=xx, ystart=yy, lon0=lon0, lon1=lon1)
TV, img, xx, yy
MAP_GRID ;;; <--- ERROR!!

This map_grid puts the grid centered on the pole of the data. The pole i
want to center it on is different, due to the different coordinate
systems.

A new map_set to change the coordinates will not work, because the
map_grid erases the screen after a map_set

I have tried plotting to the Z-buffer, reading it, and re-displaying it to
X, but TV does not have a NO_ERASE keyword as far as i can tell, so the
data part of the image gets erased again.

thanks,
-ken

Report message to a moderator

[Message index]

mapping data & grid (MAP_SET MAP_GRID)

By: Kenneth Mankoff on Wed, 02 February 2000 00:00

Previous Topic:	Re: How does IDL calculate the graph axis values?
Next Topic:	Re: thresholding/color question

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Wed Oct 08 15:33:17 PDT 2025

Total time taken to generate the page: 0.00340 seconds