![]() ![]() Shapefiles are a popular format used extensively in Geographical Information Systems. The presentation will list the advantages and disadvantages of both file types for creating interactive graphical overlays in future AWIPS applications. The trajectory tool can be used by SMG and the 45 WS forecasters to analyze weather radar imagery along a launch or landing trajectory. The second example is a launch and landing trajectory tool that produces a DGM file that plots the ground track of space vehicles during launch or landing. This tool is used by the Spaceflight Meteorology Group (SMG) at Johnson Space Center, Texas and 45th Weather Squadron (45 WS) at CCAFS to analyze the threat of natural or space vehicle-triggered lightning over a location. ![]() The first example is the Anvil Threat Corridor Forecast Tool, which produces a shapefile that depicts a graphical threat corridor of the forecast movement of thunderstorm anvil clouds, based on the observed or forecast upper-level winds. This presentation describes how to create graphical overlays on-the-fly for AWIPS, by using two examples of AWIPS applications that were created by the Applied Meteorology Unit (AMU) located at Cape Canaveral Air Force Station (CCAFS), Florida. Graphical overlays can be created in real-time in the Advanced Weather Interactive Processing System (AWIPS) using shapefiles or Denver AWIPS Risk Reduction and Requirements Evaluation (DARE) Graphics Metafile (DGM) files. Also we discuss the selection and extraction of auxiliary geographic information from TIGER files for graphical display using New S.« lessĬreating Interactive Graphical Overlays in the Advanced Weather Interactive Processing System Using Shapefiles and DGM Filesīarrett, Joe H., III Lafosse, Richard Hood, Doris Hoeth, Brian This conversion of the TIGER ``line`` format into New S ``polygon/polyline`` format is one facet of the work reported here. While census tract boundaries are inherently polygonal, they are not organized as such in the TIGER database. This paper reports on our efforts to use the TIGER map files with New S, especially to construct census tract maps of counties. New S graphics combined with the TIGER database has obvious potential. Using the map function, which requires polygons as input, census tracts can be quickly selected, plotted, shaded, etc. ![]() However, of special interest is the New S function map and its options. ![]() New S has the ability to plot contours, lines, segments, and points. On the other hand New S, a popular statistical software package by AT&T, has easily operated functions that permit advanced graphics in conjunction with data analysis. Unfortunately, the large TIGER databasemore » only provides raw alphanumeric data no utility software, graphical or otherwise, is included. Second, it contains 24 billion characters of data which describe geographic features of interest to the Census Bureau such as coastlines, hydrography, transportation networks, political boundaries, etc. First, it is publicly available through the Bureau of the Census on tape or cd-rom for a minimal fee. The TIGER database is attractive for two reasons. In 1990, the United States Bureau of the Census released detailed geographic base files known as TIGER/Line (Topologically Integrated Geographic Encoding and Referencing) which contain detail on the physical features and census tract boundaries of every county in the United States. Interfacing 1990 US Census TIGER map files with New S graphics software ![]()
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