There are no author-identified significant results in this report

Correa, E. B.

Espinosa, H. A.

Martell, J. O.

Morales, J. M.

Moreno, H. R.

English

NASA Technical Reports Server

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RECEIVED
MAY 2 3 1977
SIS 1 902.6
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Type of Report.	 Second Trimestral Report
Xlarzo 30, 1977
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https://ntrs.nasa.gov/search.jsp?R=19770019625 2020-03-22T10:03:42+00:00Z
INT1,01)UCT1Oiv.
In this second stage of the study on the use of the information given i,r
the Laudsat Satellite, we present our advances in Geology and Edapholoy, -.
A cartographi•. study that led to the elaboration of a photo -snap is also
incladcd and we further reocrt on our fi:'st. .!xperien: es in the autonh :tic
analysis o± the images.
MET11ODS.
In the last rrc;nths	 carried out in another zone of the I_05t1-
Queretaro test site using images with central coordinates 'A' 18 1 1,
100' 51'W. The interpretation of the resources was performed indi-
vidually and conjointly in tha fo ur bards of the I;SS with the aid of a
Mini -Addcol Additive Color Viewer which amplii)ries to scal-c 1:500 U00;
color prints scale 1:1 C00 000 were also used.
Once again, as- in the iircc,cding St•:g^, thr: tt' :ihtia nal p,hotoir!crprI"!Ivc
criteria, such as drainage pattern, tore ,-rhd tCXru['e of ti!c image,
land forms, eic. , were appli(A. Various images taken on differ unt cla
tes were used	 c yder to study variation:: in t kc iegotalion and ti?cir
influence on textural features.
..:ter :1 -.c n cl :;inz'.ry	 !0 t. 1 W t1C"d V:i 1:.!'!(: -_
vehicle was carried out, with relatively ease location and identification
of landforms in the field.
In orders to devise a forth in wldch Lo fill Lhe iiifurmatiun interpreted -
from tl:e ini-cl :s, a -Lud y was curried out which, 1.1-d to the elaboration
of a photomap of 11 , e area under sludy, cartogrrt)ilicaIIy defined and
referred to a Uniform s> stern of rectangular coordinates, t:iis being
the MLercato, Miiversal Transverse projectiuu.
The first stet; taken was that of evaluating the geometric precision of
the Landsat images and devising a methodolugy to supply a suficient
number of ground control points for the plotting of the Lanusat images.
Tlv^ followin g apparati were used: a coordinatoyraph; a mechanical
coordinatograi;ti, a rectifier and a point transfer device PUG, all Wild
products.
The development of a cornt,uier pro gram for the automatic interpre-
tation of resources was begun. The following four programs have beer.
terminated.
1. I111PINTAG. This program prints an image witii the fallowing ----
caracteristi.cs:
a) Print s tones of gray, all easily distinguishjbl.e.
b) Prints at different scales 1 ; p ixel per character, q pixel per -
ch8.r?0.Pr, Etc.
3.
c) Prints any band selected and gives the size of the required region.
d) Interpolates with to tones of gray. This is .eery important since
it aids the photointerpreter. Now the digital image has 128 shade
of gray, from 0 to 127. If the photuinterpreter locates a zone --
with the same shade in the photograph and considers the possible
existance of a subclass, he can solicite, through this progran;,
that an a pparenily homegeneous zone be displuyeu over a range
of 128 Shades.
2. ESTADI. This program determines the satistical values of the pi.^ccls,
derives histograms, arithmetic means, dispersion diagrams, etc. This
program classifies and prints clouds.
3. CLASIF. This program classifies and obtains homogeneous areas of
identical characteristics.
It is an important aid to photointerpretation since it gives a basis for
selecting homogeneous areas, this being called unsupervised learning
When field data u,? fed to the computer and the latter clasifies, the -
process is called supervised learning The program forms clusters
using the Zhan minimal snaring tree.
4. CONSUL. This is a prograrn whic;i takes the ground tree of a geogra
nhical data base fur later clasificatian. The geographical data base -
used is ' the CETENAL data bank whirh is fed with C ETENAI 0iriogr-ophic
4.
information gl%-= by Vie topographic, geologic, I-ind :lse, edaphology,
potential use, urban, climatological and to.tri; tic charts.
RESULTS.
GEOLOG . AiIgnni.-,nts were located w1iosc intc: • soc-tloli3 cor espoliCl.to
mineralization 'zones presently udder expiu:tation. COmple:i alignments
of c.rcular ty c, perh3po formed by intrusions, some of'_hrm 30 1:111 to
dian-ictor, were .Lso obsci-ved. The 1itlhology of t ► :e zone	 by -
the images is constituded mainly of volcanic t ype rocks of different az;es,
exccp'ting son's.^, which present char c!iteristic: of intrusive i fgticous oI
sedimentary Pocks. Tale definition of the lit:hology was mace following
field verification.
E DA YHOLOGY .
IIl the seh,aration of soil asociations it -.Yas found that in this su1111Im—lid
zone the images taken in wiiiter were the most usefal i;ccaasc most of
the soils were relatively free of vegetation and easier to delimit.
Though a complete field stud y is yet to be done, it was found that the
region covered by the image posseses in its lower part clay soils with
a high moisture retention .ind dart: coloration which in the image, on
band 4 i1I.S.S., gives a very low rc:"le^tance. Varions lakes of diffe
r.
5rent sizes e-xisi in the zoiie, giving the i.npresion of a deficient regio
Pal drainage.
Some areas of ininimum reflectance in all ban,-!,, correspond to flooded
zones, Parts of which are devoted to agriculture in the dry- season, thi::
being confirmed by comparing images of different dates.
In t!^e hi-her parts, various tonal and textural ch nres  are ol.scrvcd --
whkh may be dehmited in tie image and which correspond to differs nt
soil associations. This will be confirmed 'M a future field verification.
CA RTOGRAPIIY. A photomap of the test site was elaborated (cope -
annexed ) in Mercator Universal Transverse Projection, %kith four -
i:niages on bend 5, using 2'7 photogrammetric control points obtained --
directly from the 1:50000 CET ENAL topographic map. A precision o;
0. 25 mm in mean quadratic error was achieved in the finis.icd product.
Distances were measured on the photomap and compared to those obtained
by analytical methods, with a resuliinb mean quaar: tic error of 128. 11 —,.
Autoinatic Interpretat ion. - A print is enclosed of a portion of an iinabe.
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A


Comprehensive study of Leon-Queretaro area

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