1 - NGA

,.
This rney be measured, and the pressure
~e~~~, in te~ at that heiflh(, as In inches Of
CRY Omphlc (CG)-Larpe-scale lithographic
map of populated pfaces and environs
porrrsying afreets and through-route information
Features frduda Impcrrtanf buildings, airfields,
mifiiary installations, industrial cwnpfexes,
embassies, etc. Pmduc8d at 1:25,000 and
larger scale. See also cfty pmducfa.
city plan—See city products.
City pmducta-Large-ecale maps of
poputetad plaoaa and envirorra, usually
porfrsylrsg sweat amf through-mule Irrlormalion,
irnpon”am-buildings and othtir urban features,
airfields, port facilities, and relief. drainage, and
vegetation when imporlant. Severel different
types of city pnxfucfs are prcducad by DMA,
among which are cdy graphka, city plans, city
route grsphics, and mifitary city maps.
Specifications (or these maps vary according to
parficufar mlltary requiremems.
City route graphlca (CRG)-See city
products. ,.. .
cfty survey-A speciaffzed type of land survey
restrkxed to work campleted primarily within the
Iimtis of a ciiy.
cIvII day—A solar day beginning at midnight.
The cfvii day may be based on either apparem
solar fires or mean solar fime. See also
metronomic day.
CIVII tlma-Sofar lime In a day (civil day) that
begins af midnight. Civil lime may be either
apparanf solar time or mean solar time; if may
be wumed in two series of 12 hours each,
beginning al midnight, marked ‘am” (ante
meridmn), and at noon, marked “pm” (post
merkllan], or In a sfngfe seties of 24 hours
beginning at midnight.
Clairaut% tfWoram-A theorem that, in its
o~lnal tom, rela!es the value of centrifugal
force at the Equator to the value of gravity at
the Equator. Imfxmancs to physicaf geodesy Is
that the flattening of the Earth can be obtained
from gravlfy maaauranrants.
clamplrsg ●rror—A eyslamatic error in
observatbns made with a repsafing theodolffe
cauaed by atrairrs rjel up by the clamplng
devkes of the Instrumem.
MIL-HDBK-850
44
Clarke ●phamld (clltpaolrf) of 1B66- A
raf erence elfiisoid having the Iotfowing
approximate Wnansions: eemin@or axla-
6,37S,206.4 meters and the tlaffening or
eltipticify-1/294 .9786982.
Clarke epheroid (alllpaold) of 188G- A
reference elfipsokd having Iha follo@ng
approximate dimensions: semimapr axb-
6,37S,249.1 45 maters; and the flattening or
elliplkffy-1/293 .465.
claastlicatlon copy-A speclaiiied item of
sourca maferfal used as a gubte by the wrnpilar
andlor draftsman in preparing a map or chart.
Usually consists of detailed informatbn
pertaining to roads, railroads, cfty data, and the
like that has been devebpad trom tietd aurvaya.
Usually furnished in the form 01 overlays,
annotated maps, drawings, pholographe, or
field sheets.
clasalficatlon survey+ee fbld
Inapectlon.
Claaslfled Hydrogmphlc Information
Processing System (CtflPS)-Ttre DMA
data base which provides rmvigetiin update
information for classified charts and pub ficatbns.
Classllied Notice to Marinera-DM A
publication which provides mrrecfive data
appficsble to classiiiea charts and ~biications.
Tfris informal’km is afao accessible throu~h the
Classified t-fydmgrsphic tntormatfin Process”w
System (CHiPS).
cleerlng y-paraliax-See relattve
orlantatlon.
cllnomater—A simple in. NNfI’tenf used tOr
measuring the degree of slope in percemage or
in angular measure.
clipplng-1. (GIS) The process of
subdividing overlapping potygons to preduce alt
mmbinations of aeparale unique polygons.
Also caliad completing, 2. (computer
grapMcs) The severing of that pzrfbn of a line
segment which falls outside a predafinsd frame.
clock corractlorr-The quantity which is
added, algebraicetly, to the tima shovrn by a
clock to obtain the time of a gben meridian. If
fhe cfock Is slow, the mrracfbn is positive: it fast,
negative, When applied to a chronometer it is
caifed chronometer correct Ion.