5,326 research outputs found
The omega-limit sets of quadratic Julia sets
In this paper we characterize \w-limit sets of dendritic Julia sets for
quadratic maps. We use Baldwin's symbolic representation of these spaces as a
non-Hausdorff itinerary space and prove that quadratic maps with dendritic
Julia sets have shadowing, and also that for all such maps, a closed invariant
set is an \w-limit set of a point if, and only if, it is internally chain
transitive.Comment: 24 page
Digital color analysis of color-ratio composite LANDSAT scenes
A method is presented that can be used to calculate approximate Munsell coordinates of the colors produced by making a color composite from three registered images. Applied to the LANDSAT MSS data of the Goldfield, Nevada, area, this method permits precise and quantitative definition of the limonitic areas originally observed in a LANDSAT color ratio composite. In addition, areas of transported limonite can be discriminated from the limonite in the hydrothermally altered areas of the Goldfield mining district. From the analysis, the numerical distinction between limonitic and nonlimonitic ground is generally less than 3% using the LANDSAT bands and as much as 8% in ratios of LANDSAT MSS bands
Considerations concerning future satellite experiments
Areas of research which would be particularly beneficial to the application of remote sensing to mineral exploration are suggested and discussed. These areas are (1) refinement of spectral data in the .4 to 2.5 micron region, (2) systematic research in spatial resolution, and (3) better data for geological structural studies
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