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Shapefiles : are a data exchange format created by ESRI and one of the most widely used GIS/geodata formats. One "shapefile" usually include four different files : .shp, .shx, .dbf, .prj. First three files must all be present in order to use the data. Each shapefile can hold only one geometry type.
This mismatch was not possible when the census TIGER files were available in ASCII format that was topological unlike shapefiles. The Census Bureau has made the data available through WMS servers. [4] The data forms a base for OpenStreetMap in the US, and also was used for the initial import of US map data into the Waze navigation system.
The shapefile format is a geospatial vector data format for geographic information system (GIS) software. It is developed and regulated by Esri as a mostly open specification for data interoperability among Esri and other GIS software products . [ 1 ]
Government employees are not necessarily the same as civil servants, as some jurisdictions specifically define which employees are civil servants; for example, it often excludes military employees. [1] The federal government is the nation's single largest employer, although it employs only about 12% of all government employees, compared to 24% ...
This document specifies the US National Grid as the primary standard coordinate reference system to be used for all land-based search and rescue (SAR) activities in the US. [22] In 2015, the Federal Emergency Management Agency (FEMA) issued FEMA Directive 092–5, "Use of the United States National Grid (USNG)": [23]
[12]: 218 A topology rulebase is a list of desired topology rules used to enforce spatial integrity in spaghetti data, such as "county polygons must not overlap" and "state polygons must share boundaries with county polygons." [13] Vector datasets usually represent discrete geographical features, such as buildings, trees, and counties.
This category is for forms issued by the federal government of the United States. All such forms are numbered, and may have other names (for example, Form 1040 is called the U.S. Individual Income Tax Return.)
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