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Oedegaard, H. A.

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Produced by the NASA Center for Aerospace Information (CASI) 
https://ntrs.nasa.gov/search.jsp?R=19750025387 2020-03-22T18:59:58+00:00Z
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H, drolog-y, snow
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Norwel;ian 1.'ater ResourcE^ and 17lectricity Board
Postbox 5001 a jor° ;i. ^, Cclo 3, Norway
a i.'.	 r:j - ..•^1'12iL ..L^?•ll'^J	 (....'.0 i( dd7•C:Jt+—^^
Oslo 1
COilivest - rc4 torZ> rienl S°_L' 2':aP : ercrt.
Due to Eood weather-conditions in the southern ;4xt of Norway the u: 3er-
fliCht 
-Plans has "one according, to plans. Feveral gocd Lrdsat -*.
has been r( -ived. It sees:, to be possible to locate areas W
,.tl, a thick
snow-cover.
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	 HY^t^r)L^r:I^4L I •tV^S r Ic;ATIONS TN
	 475-314AI
"')AWAY OuartArly n Ppert, 1 Apr. - 4uo. 1011,
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RECEIV`0
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I1 Techniques
Up to this date (Augu::t 1.) !16 inuges ►,ave been received of all band- as 70 mm
negative film f. ,om L:andsat 1I through Sioux F'nlls. The imagery have a very high
qualit.r , and .how y lot more detail than we have seen before. A computer listing
has been prepared and will be kept up to date covering all imagery available o;
:dorway .
1, first cloud-free i:.nge has been obtained of the mouatai::-pl ate au llurdenre .vidda
(2021+ - 10034) as earl., as F'abruary. Hardangervidda is the catelmentarea for the
larrest hydroelectric power plants in :southern Norway and L considerable econoMic
interest is involved in predicting runoff from snow-melt. Work has started with
rip-overlays and all measured snow-depth, and snow-line neasu_rements will to
plotted on the maps.
III Accomplis1=1ents
(l ) hp to this date (r.ugust 1. ) only four images has been received that will be
used for the test areas.
Inage 202 1 1 - ' 1034 has shown an area of Harda.ngervidda w.:ere the snow-cover
is clearly different from the rest cf the nountain-area. This is very
interesting as the area-where hear. , snowcover is reported. If this is
correct it will to posait!e to Cet information of snowdepth frost, the ima ery.
(2) The finding, rcrcrted under (1) has not been verified by later Lendsat-i: :Eery
or grour9-surve y s yet. We have been notified by NASA that such imagery will
ve available at a later data. 3ro ,.md-surveys are available, but has not yet
been compiled.
(3) We have been very lucky with weather-conditions on all satellite-passings
this spring. The planned ground-surveys have therefore been performed
succesfully according to plans.
IV	 Signi ficant fiesults
At this early stage of the wort: it seems no:-cible to take out areas with extremely
tiller. snow-cover (w1thout use of complicated analysis-equipment) directly visualy
F"
from
if this i:; verified +'. •wi ground-ourvcyo and experience from later years, it will
accord i.rtE; to ol>(-rats ;n: per:onell -.)e a very valuable new tool for water-irLi.nagcr-r,nt
in areas W ,4 h the swie 1andforns.
Tids :.,pesifie informution can toddy not be collected by aerial phothography. Only
point meal. L-ements can t,,: made by rrout,i Fir:conell, but we have up to this date
been a little hesit^uit to extend stwch mea.-urement to greater areas because co
many uncertainties are ir,volved.
The method of' meusuring the reduction in natural gar artidiation corrolated with snow-
water equivalent has bean used on an operational bands on the Hardangervidda plateau.
1
	
	 Theese conventional methods will new be a valuable compliment to use of satellite
iragery.
Y. Publ.icaf.ions
A ::crie of articles hau, "been puLlished in newspapers Ind non technical publications
about r(-note sensing,. itadio f r.d TV in Norway has c:l o had a good ccverage - but it
is a lon,
	 tc r.:: -.0 ti.c- new ideas of reno ,.c sensing from satellite known to the
public.	 ~e pressing to Cet a receiving station for bandsat inagery in Tromso
in nothr n :sor,.ray.
Inhouse a report has been made where we have shown wY:at car: be done on vegetation
I	
napping wi:;h Lanasat imaged and a computer. A map was prepared from a printout
from LARRY at Purduc of a reindeer grasit,g-area in nothern Norway. Maps of this
type has to be prepared for applications fcr permission to construct new dams and
power plants. Cro::d crews will check the re:;ults in the field.
Sever.--L talks have been given, specially one at a convention of owners of hydro
electric power plants. The new ideas aroused great interest.
V1.	 No problems
VT1. Data Quality -.nd Delivery
Quality and d,•.iver;: 	 ,;aticfact.ory. Some of the negative films (70 trm) are too
IF
II
-1+-
d}L • r., ^.-c:pecially those including snow-covered areas. There is rclsn a vrriutior.
in the sharpness in ;!.^ film. Some are pinpoint shurr. while others rare not
reproduced co oharp. .Judgii.6 "ro:a Vie sharpnec:: of the text it seems that the
reproduction equipmcnL i:: sot, alw iy;; od jU3ted us wall ac it is possible.
t,is was als, a proble.. with imagery fro g, Lind: at I. J:cI ivory -tire is 2 - 3 months.
The small, films are .:., 	 ed from Sioux Falls in big hcuv;. , envelopes with thick
cardboard. he poot; r-ct for such shipments in, considerable, and it should be
considered if thin material could be shipped in a ror( )raeticle way and cave on
postade.
C	 41
VIII. Recorsner.aations
--- ----------- --
It would be valuable to get an idea of how much coverage ue can expect this fall
from Lat,dsat II if weatLer-conditions are favorable. This would rnaYe it Much
siripler to plan work b y
 ground crews. Of course we understand that technical
difficulties may chunge the plan.
It- is too esrly to draw any definite concl-.; , ions, but it is sure that Landsat has
filled all our expectations and we can see many new fields where this new tool
will be Val zal l ^ .
Oslo, Auguct 25, 1975
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Hydrological investigations in Norway

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