townships, etc., should be substantially reduced, since the significant
tasks of geometric correction, and often of defining boundaries, will
not be necessary. Costs of these operations can thus be spread over
many projects.
10. SUMMARY
Through a NASA-funded contract, the Office for Remote Sensing of Earth
Resources at The Pennsylvania State University has acquired a Landsat
digital mosaic data base on the UTM map projection of the state of
Pennsylvania. It has also acquired software and expertise to construct
such mosaics and register them to the data base. In addition, ORSER
and JPL personnel have developed a state-wide mosaic (registered to the
data base) from summer 1981 imagery for use in a demonstration of the
utility of such data for gypsy moth defoliation assessment. A user-
friendly computer procedure is available to store, interrogate, re
trieve or manipulate subsets of the data base and associated ancillary
data.
The data base, together with various types of ancillary data, provides
a geographically consistent data set for a wide variety of applications,
both of a research and service nature. We expect that the data base
will be a major source of land-use/resource data in the state.
REFERENCES
Cullinane Corp . 1980. INTERACT User's Guide. CulLlnane Corp., Wellesley, M\.
Turner, B.J., G.M. Baumer and W.L. Myers. 1982. The ORSER Remote Sens
ing Analysis System: A User's Manual. Res.Pub.109/OR. Inst.for Res. on
Land and Water Resources, The Penna.State Univ.,University Park, PA.
Williams, D.L., C.L. Dottavio, and R.F. Nelson. In manuscript. Develop
ment of a Statewide Landsat Digital Data Base for Forest Insect Damage
Assessment. (To be published in Proceedings, ISPRIS IV, Technical
Meetings.on Environmental Assessment and Resource Management.)
Zobrist, A.L., and N.A. Bryant. 1979. Map Characteristics of Landsat
Mosaics. Proc., Amer. Soc. of Photogram. Ann. Convention, pp.260-273.
Zobrist, A.L., N.A. Bryant, and R.G. McLeod. Unpub. manuscript. Tech
nology for Large Digital Mosaics of Landsat Data.
APPENDIX: Sample INTERACT Session
The following example shows how easily the job stem can be set up to
subset data from the Pennsylvania Data Base. Similar procedures are
used for subsets by county, forest district, user-defined polygon, or
pest-locator grid cell. Output can be to tape or disc. User inputs
are shown in lower case.
? exec from men. u41000 .gmb. li b//or sergo on vol005 clr
WELCOME TO THE ORSER SYSTEM.
OK TO CLEAR ACTIVE FILE? ok
ENTER PROGRAM NAME OR 'HELP' FOR A DETAILED LIST OF INSTRUCTIONS.
ENTER 'LISTTAPES' TO LIST WORKING TAPES (RS TAPES) ASSIGNED TO YOU.
ENTER 'POLYGON' TO EXECUTE ANY ORSER POLYGON PROGRAM.
ENTER 'DATABASE' TO ACCESS THE PENNSYLVANIA LANDSAT DATABASE.
ENTER 'EXIT' TO EXIT THIS EXEC FILE.
-->database
