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cso:instruments:heterodyne:mapping [2014-04-09 21:52] (current) sradford created |
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+ | ====== Mapping ======= | ||
+ | Heterodyne mapping is done by offset pointing the telescope. Especially for larger maps, [[otfmap]] is more efficient for larger maps because a common reference position is used for all the cells in each row. | ||
+ | |||
+ | ==== UIP commands ==== | ||
+ | |||
+ | - Point by point mapping using position switching with a specified reference position. This example uses looping commands to make a 3 x 3 map in equatorial coordinates with 15 arcsec spacing. \\ ''__uip__> ** for i 1 to 3 ** '' \\ ''__uip__> ** \_ rao /map (i-2)*15 ** '' \\ ''__uip__> ** \_ for j 1 to 3 ** '' \\ ''__uip__> ** \_\_ deco /map (j-2)*15 ** '' \\ ''__uip__> ** \_\_ oo_scan //N// /designated_off **'' \\ ''__uip__> ** \_ next ** '' \\ ''__uip__> ** next ** '' | ||
+ | * At each map position, the telescope will move asymmetrically \\ ''OFF ON'' | ||
+ | * //N// is the number of repetitions of this pattern. | ||
+ | * The reference position must be specified in the source [[cso:telescope:uip:catalog|catalog]] as //target//:off_position. | ||
+ | - Same example but without the looping commands. \\ ''__uip__> ** rao /map -15 ** '' \\ ''__uip__> ** deco /map -15 ** '' \\ ''__uip__> ** oo_scan //N// /designated_off **'' \\ ''__uip__> ** deco /map 0 ** '' \\ ''__uip__> ** oo_scan //N// /designated_off **'' \\ ''__uip__> ** deco /map +15 ** '' \\ ''__uip__> ** oo_scan //N// /designated_off **'' \\ etc. |