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General Disclaimer

One or more of the Following Statements may affect this Document

This document has been reproduced from the best copy furnished by the

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This document may contain tone-on-tone or color graphs, charts and/or pictures,

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Portions of this document are not fully legible due to the historical nature of some

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Produced by the NASA Center for Aerospace Information (CASI)

(2)

ST^^

D .

Landsat Follow-On Investigation 01610

Type 11 Progress Report

"Made availab

.e

under NASA sponsorship

March 31, 1976

in the interest of early aw'

9

3

1 sem:natin.nf Earth heso+;rc S+u;w

r

Principal Investigator

Pier

&fil InfCfTl3tIC.

R. W. Paul:

oilu U.S. Geological Survey for any use fobde

_{National Center, MS 467}

• Reston, Va. 22092 -- ---- ..,.*Tqe

97.6 - 1 0.2 8.4

C

l

^- 1y4^65'f

.

t i

The Water Resources Division (WRD), U.S. Geological Survey (USCS) continues to assess the use of the-Landsat Data Collection Systems (DCS)

for rclaying hydrologic data.

Ln

The primary objective of this investigation is to introduce DCS tech-r4 -r nolocy to WRT

)

districts; It has become apparent from the testing of th-^o V N Landsat DCS by the Geological Survey, U.S. Army Corps of Engineers and

^e o0 other agencies during; the first 3 years of the Landsat era that DCS

tech-nology is viable. As a result of several NASA-funded Landsat investigations a small cadre of WRD professionals and technicians have gained operational and technical experience with DCS technology. An important result of the rn NASA-funded investigations has been the fonaation of a WRD-funded Data

ke-lay Research.Program, wh.ir_h is testing the Landswit and SITS/GOES DCS's aTid -

7

- is evaluating the possibility of testing

•

a commercial DCS system using o commercial communications satellites. Concurrent with the WRD research

Fv

a Program is the conduct of Landsat investigation X21610, which is intended

A

U to bro::den the base of WI:D familiarity with this technology. The plan is

0 c6 to install Landsat Data Collection Platforms (DCP) in as many of the

48

P HC rl- WRD districts as possible and facilitate the retrieval of t'Tese data through

^ the USGS telccomputer network. This network is composed of two 370/155

ps 0 W ..

computers in Reston, Va. and a network of over 180 remote computer terminals

'

C00

^ that are distri.hutcd in district regional, and project offices across the

p.4 a cL b

.

i;

.

P J

oc United States.

tr. o

-

The key accomplishment of this investigation during the past 9 months

E4 w N

N

0

_o

has been the establishment of a data transfer

P

roccdure that

l

p

ermits

Lar-d-N Lar-d-N Lar-d-N sat DCS data to be transmitted in r.eol

Hme

from NASA to the Geological.

v M a, Survey's National. Center in Reston, Va. With USGS funds and the

excel-vi

c?

u

a.

lent cooperation of NASA personnel at the Goddard Space Flight Center, a

C N

a

dedicated (9600 baud) digital communications 'iue botwccn thc- Landsat ¢' w (V Operation Control. Center (OCC) and Reston was established in thr sunrner of

E' H

N

191. All NASCOM data routed to the ')CC that are identified as Landsat.

-'0

N

•, TICS dam are rerouted in real time through the OC(,' computer to the

deli-0

cited line to Reston, where they are copied on

a

magnetic tape record(:r-.

er

z U

to

Twice per clay, at about 9 a.m. an(] 4 p.m. these (l:Tta are enrcred into the.

W

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r.omiTU -er in Re^;ron i•rhere USCS Datn Collection Platform (t)C1') dam

u H

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stripped off rand copied canto

on onl.inr di .k file. Each USCS DCP

file

V-- U " O

c w o .4 o maintains a record of the most recently collected 180 DCP transmissions,

r " ra a `n

which normally covers a 2-3 week period.

t U = V' 41

RECEIVED

APR 1 3 1976

SIS1902.6

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-F— _i

F fW

t

.L

X'.;

WRD

disLyfuLs t.ln•n retrieve

the data aL a freyucney to MvPL their

exper-imvutal nccdn, Their retrievals are supported by cowman snfLwaiv that are

used to pas.-. the raw data directly to the user car pa

s

s the raw data to

pro-consing prngrnmR

where

the data arc• converted to an engincc-ring unit in a

standard USGS Qrmat and ro

p

ted

Let I& user%

cmVuter irrmhml.

10 gvner.al Lhis procedure work: well'and provides near )cal_ time

pro-cvns vd

daLn

to

WRD dint rice off ices. Table

1 is a list of all J.andsat DCP

stations

that are supported by the WAD file. Most of these DCI''s arc

,

oper-aLrd by

WRn dintrictm, but a

small

i-rcentage are opera

ted

by

Pvrer Hard

Of the Survey's Geologic Division.

PROBLEMS

Several problems have interrupted this data flow:

(1) Octnsiunally NASn trar)cing station personnel (aL NTTF, Coldstone,

Kirbanks:) genurat e e ccessive amouutn of tent data that, on a wcekvnd in

particular, ran fill ap the Ruston magnetic tape: with large amounts of

test data, causing the tape to run out prematurely. Normally a modest

amount of test data ar

p

sent before a Landvat

pa!•s to verify that thr-

com-wunications sysLon is working wall. The Landsat OCC has informed traKing

station personnel of the problem, and

their

cooperation has been good,

al-though occasionally the problem recurs.

(7) Recently a 141:1) DCP in the field malfunctioned and transmitted

data

at

a rate of 2 or 3 messages per second rather thin the nortaal. 1 la

y

ssago per

1$0 seconds,. The r

"

esu.ltant high data rate caused the Renton ma,

neLic

tape

to fill up over a weohend and data were lo:,t. The DCP (iD0402) was

turn

p

d off, and srnt

to

J. E. Painter at GSHC to detertuine Lhe cause of

the malfunction.

(3) Transient power failures at Restun have caused the n•ngnetic tape ro

.

-cordcr to fail, resulting in data loFis.

Those problems arcs tolerable for an expel im(ntal syster, but th. UR1)

may

att

empt

to

backup the tape recut dcr with a minicomputer in early n

.

77

to climinatc Ill(, problem.

SICNIFICAN'1 P.ESULTS

WRD personnel in about 25 d

istricts

are using DCS technology and are

Introducing

the

teclmulogy to many of the 55n Iocal., state, and federal

ageve les with which t ht y cooperate. Ihis1 hand::-on expericn.

•

r!

.is

urci::-nary to introduce the technology as a precursor to follow on operational system.

PUBLICATIONS

Numerous talks We been given i o 1

mml , 1:l o

I e and D vra 1

I:gni

i

es;

about. this

La"Joat

Inv( svioal ion. A s::,1+1pic

ili

l h--• ;v tol4: 111r'1u,1,',

—

Meeting

at

11w

Vvsl au

WRD

off ire with t

vl

rj,:'

. of i•.n; ,, i+ ii 't V:- I„ i I

f rou, I be Cold

1,111 t

. ) c!, o n:;l lal I 11 iI .1 t ,

from

I he

ReKon Survey compel...

The Corp:, h:1::

;•I „ n ir,l ^. t •

iii

rel l ieving

tho it 1101'

dalrl f 1171

J1W

I1 SCS CU111pr-1t c • 1 in 1'.:'f nn,

I

IV

(8)

'719

ii

r ,.

-

a paper. y iven to the American

(if

c, Ci v

i

J Enp,inner.; N:^t i^»r^l

Capital. Section, cutitJed "Development and Appl.icat ion;: of Wnt-r

t

Rcsourccs Data Collcct:iou Syst(^mG via Satt41itc, .", Alnrch P), 19'f(1.

M1v(A nF,S with 1d[tD di; trict staff ind co^apr

rot-in apc•nc • y off icia]

g

s

on V IRD data rclrny researeh in I lit , Nevada :end Oc,-gon d tssrr in s,

woc:k of Tinrch

29, 1976.

a paper. (-in press) to bo given to the lnteruntivnnl Soroinar oil

OperaLiml of ilydro]oi;ic Service:: which will be held in

OLIaW.I,

Canada in .luly 1976. The paper is entitled 'T^,e of Earth

Satcl-lites fm- Automation of Hydrologic Data Collection."

R};C0I0IFNDAT I ONS

It would be Useful if the OCC could prov;dc tlj, VMM with backup D(:S

data oil

tape for those periods wl •ien data arc .icitcrruptccl by tile

problems cited above.

YUNDS EXPENDED

No NASA feuds have been expended. This investigation is supported by USGS funds.

1'..