Analysis of scanner data for crop inventories

There are no author-identified significant results in this report

A Study of the Present and Potential Utilization of the Boy Scout Program by Evangelical Churches

The evangelical Protestant movement in America is being identified as a struggle for identity and existence due to the advances made by neo-orthodoxy and liberalism into the basic beliefs of all Protestants. With this growth has come the ecumenical movement which is reaching all who profess the Christian faith. As long as these forces are gripping the mind and attention of most nominal American Protestants, the evangelical forces within this nation are being forced to re-examine their principles and programs in order to strengthen the emphasis on a vital, Bible-centered program of\u27 evangelism and soul winning. As evangelical Protestant denominations and conferences seek to re-emphasize this program of evangelism, they are seeking to identify themselves with persons and movements that will reflect this fundamental and evangelical outreach to which they hold dear. While most of this identification is definitely with religious groups and movements, there has been an outreach to interfaith movements that are of high moral and spiritual quality and ministry. One of these agencies is the Boy Scouts of America. While nonsectarian in philosophy and program this movement endeavors to help each of its members to understand and live the religious faith to which he subscribes. With this principle in mind, many churches are seeking within the Boy Scouts of America a means to minister to more of their youth in a way that is truly Christian. While this is a trend of the times, the number of scout units sponsored by evangelical Protestant churches is still small \u27When compared to the number of units sponsored by nonevangelical churches. It is not to say here whether this is good or bad, but rather, to realize that a problem does exist in this area

Development, implementation and evaluation of satellite-aided agricultural monitoring systems

Research supporting the use of remote sensing for inventory and assessment of agricultural commodities is summarized. Three task areas are described: (1) corn and soybean crop spectral/temporal signature characterization; (2) efficient area estimation technology development; and (3) advanced satellite and sensor system definition. Studies include an assessment of alternative green measures from MSS variables; the evaluation of alternative methods for identifying, labeling or classification targets in an automobile procedural context; a comparison of MSS, the advanced very high resolution radiometer and the coastal zone color scanner, as well as a critical assessment of thematic mapper dimensionally and spectral structure

Investigations of vegetation and soils information contained in LANDSAT Thematic Mapper and Multispectral Scanner data

An extension of the TM tasseled cap transformation to reflectance factor data is presented, and the basic concepts underlying the tasseled cap transformations are described. The ratio of TM bands 5 and 7, and TM tasseled cap wetness, are both shown to offer promise of direct detection of available soil moisture. Some effects of organic matter and other soil characteristics or constituents on TM tasseled cap spectral response are also considered

Investigation of techniques for inventorying forested regions. Volume 2: Forestry information system requirements and joint use of remotely sensed and ancillary data

The author has identified the following significant results. Effects of terrain topography in mountainous forested regions on LANDSAT signals and classifier training were found to be significant. The aspect of sloping terrain relative to the sun's azimuth was the major cause of variability. A relative insolation factor could be defined which, in a single variable, represents the joint effects of slope and aspect and solar geometry on irradiance. Forest canopy reflectances were bound, both through simulation, and empirically, to have nondiffuse reflectance characteristics. Training procedures could be improved by stratifying in the space of ancillary variables and training in each stratum. Application of the Tasselled-Cap transformation for LANDSAT data acquired over forested terrain could provide a viable technique for data compression and convenient physical interpretations

Development, implementation and evaluation of satellite-aided agricultural monitoring systems

Research activities in support of AgRISTARS Inventory Technology Development Project in the use of aerospace remote sensing for agricultural inventory described include: (1) corn and soybean crop spectral temporal signature characterization; (2) efficient area estimation techniques development; and (3) advanced satellite and sensor system definition. Studies include a statistical evaluation of the impact of cultural and environmental factors on crop spectral profiles, the development and evaluation of an automatic crop area estimation procedure, and the joint use of SEASAT-SAR and LANDSAT MSS for crop inventory

Analysis of scanner data for crop inventories

There are no author-identified significant results in this report

Distribution of the Marsh Periwinkle Littorina irrorata (Say) in a Virginia Salt Marsh

Littorina irrorata varies over its geographic range in maximum size, preferred elevations relative to tidal datum planes, and in the type of vegetation it inhabits. On Wallops Island, Virginia, postlarvae of Littorina irrorata with shell lengths \u3c 5 mm long live almost exclusively in dead, curled-up leaves of Spartina alterniflora at elevations near mean tide level, below elevations occupied by larger conspecifics. Snails longer than 5 mm in length increase in average size with decreasing elevation. This distribution is opposite to that found by Hamilton (1978) in a marsh in Florida. No difference was found in our study area in growth rate of marked snails at two different elevations, so the size-elevation gradient probably is not caused by differences in growth rate. Snails 15 to 19 mm long are more active when exposed to reduced salinities than snails \u3e 21 mm long. The lowest salinities recorded in the marsh occurred at the highest elevations. This salinity effect, together with mortality from known size-selective predators, may account, at least in part, for the seaward increase in mean shell size

Distribution of the Marsh Periwinkle Littorina irrorata (Say) in a Virginia Salt Marsh

Littorina irrorata varies over its geographic range in maximum size, preferred elevations relative to tidal datum planes, and in the type of vegetation it inhabits. On Wallops Island, Virginia, postlarvae of Littorina irrorata with shell lengths \u3c 5 mm long live almost exclusively in dead, curled-up leaves of Spartina alterniflora at elevations near mean tide level, below elevations occupied by larger conspecifics. Snails longer than 5 mm in length increase in average size with decreasing elevation. This distribution is opposite to that found by Hamilton (1978) in a marsh in Florida. No difference was found in our study area in growth rate of marked snails at two different elevations, so the size-elevation gradient probably is not caused by differences in growth rate. Snails 15 to 19 mm long are more active when exposed to reduced salinities than snails \u3e 21 mm long. The lowest salinities recorded in the marsh occurred at the highest elevations. This salinity effect, together with mortality from known size-selective predators, may account, at least in part, for the seaward increase in mean shell size

Experimental Estimation of the GPR Groundwave Sampling Depth

Monitoring near-surface soil water content is essential for efficient water management and for understanding hydrologic processes in soils. Ground-penetrating radar (GPR) groundwaves are an approach that can be used to monitor the near-surface soil water content, but the efficacy of this technique is currently limited by the uncertainty surrounding the groundwave sampling depth. This research experimentally determines the sampling depth of GPR groundwaves under dry and saturated conditions in a sandy soil. Data were acquired using 250, 500, and 1000 MHz antennas within an experimental tank containing soil layers of contrasting electromagnetic velocities. Results show that the groundwave sampling depth is a function of frequency in both dry and saturated soils, and sampling depth is inversely related to frequency. A comparison of data acquired under dry and saturated conditions indicates that the groundwave sampling depth is slightly less in saturated soil than in dry soil, but the dependence of sampling depth on soil water content may be less than has been predicted using numerical modeling. The minimum sampling depth observed in this experiment was 12 cm for the 1000 MHz antennas in saturated sand, and the maximum sampling depth was 30 cm for the 250 MHz antennas in dry sand