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AIRBORNE KINEMATIC GPS POSITIONING FOR PHOTOGRAMMETRY THE DETERMINATION OF THE CAMERA EXPOSURE STATION

Lewis A. Lapine, Ph.D. Chief, National Geodetic Survey Silver Spring, MD 20910

ABSTRACT

Kinematic GPS positioning of airborne platforms coupled with aerial photogrammetry has become an operational reality

within NOAA.

Real time GPS positioning is utilized for

navigation,

while

post

processed

carrier

phase

differencing

is employed for exposure station locations. presently practical for the exposure station

Since it is not event to control

the GPS collection, the antenna time of exposure must be computed

phase center position at the by interpolating the aircraft

trajectory after the appropriate timing biases

to the observed exposure time.

This paper will

have been added discuss present

and future methods station event.

for

determining

the

position

of

the

exposure

INTRODUCTION

Kinematic GPS positioning of airborne platforms coupled with aerial photogrammetry has become an operational reality

within NOAA (Lapine 1990).

Real time GPS positioning

utilized

for

navigation,

while

post

processed

carrier

is phase

differencing is employed for exposure station locations. Nearly every NOAA aerial mapping project employs some

combination of airborne GPS aerotriangulation process.

and ground control for the In every case, the requirement

ground

control

has

been

reduced.

Operational

efficiency

for has

increased

as

the

need

for

expensive

and

labor

intensive

ground

control has diminished. such that it will become

This technology is rapidly the most commercially viable

maturing approach

for aerial mapping.

Commercialization will be heavily

dependent

on

instrumentation,

capitalization

costs

and

processing efforts, all of which are now

technology.

Instrumentation

is

available

in as

the favor of the a result of other

GPS and photogrammetric applications. Capitalization costs have decreased as a result of the increased market share of

GPS in the surveying and mapping software has been improved by the

fields. Post processing manufacturers, academia and

federal sector (Mader software is efficient presently possible to

1992) to the point where user friendly

and

readily

sample

the

available.

GPS

signal

Since

it

is

not

the

instant

of

at

exposure, some information is

sampling

rate

form of interpolation of the

required.

The

ultimate

goal

and

interpolation

model

which

GPS positional is to select a yield exposure

station accuracy commensurate with the while at the same time minimizing post

final mapping product processing effort.

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