1.
Geographic coordinate system
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A geographic coordinate system is a coordinate system used in geography that enables every location on Earth to be specified by a set of numbers, letters or symbols. The coordinates are chosen such that one of the numbers represents a vertical position. A common choice of coordinates is latitude, longitude and elevation, to specify a location on a two-dimensional map requires a map projection. The invention of a coordinate system is generally credited to Eratosthenes of Cyrene. Ptolemy credited him with the adoption of longitude and latitude. Ptolemys 2nd-century Geography used the prime meridian but measured latitude from the equator instead. Mathematical cartography resumed in Europe following Maximus Planudes recovery of Ptolemys text a little before 1300, in 1884, the United States hosted the International Meridian Conference, attended by representatives from twenty-five nations. Twenty-two of them agreed to adopt the longitude of the Royal Observatory in Greenwich, the Dominican Republic voted against the motion, while France and Brazil abstained. France adopted Greenwich Mean Time in place of local determinations by the Paris Observatory in 1911, the latitude of a point on Earths surface is the angle between the equatorial plane and the straight line that passes through that point and through the center of the Earth. Lines joining points of the same latitude trace circles on the surface of Earth called parallels, as they are parallel to the equator, the north pole is 90° N, the south pole is 90° S. The 0° parallel of latitude is designated the equator, the plane of all geographic coordinate systems. The equator divides the globe into Northern and Southern Hemispheres, the longitude of a point on Earths surface is the angle east or west of a reference meridian to another meridian that passes through that point. All meridians are halves of great ellipses, which converge at the north and south poles, the prime meridian determines the proper Eastern and Western Hemispheres, although maps often divide these hemispheres further west in order to keep the Old World on a single side. The antipodal meridian of Greenwich is both 180°W and 180°E, the combination of these two components specifies the position of any location on the surface of Earth, without consideration of altitude or depth. The grid formed by lines of latitude and longitude is known as a graticule, the origin/zero point of this system is located in the Gulf of Guinea about 625 km south of Tema, Ghana. To completely specify a location of a feature on, in, or above Earth. Earth is not a sphere, but a shape approximating a biaxial ellipsoid. It is nearly spherical, but has an equatorial bulge making the radius at the equator about 0. 3% larger than the radius measured through the poles, the shorter axis approximately coincides with the axis of rotation
2.
United States
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Forty-eight of the fifty states and the federal district are contiguous and located in North America between Canada and Mexico. The state of Alaska is in the northwest corner of North America, bordered by Canada to the east, the state of Hawaii is an archipelago in the mid-Pacific Ocean. The U. S. territories are scattered about the Pacific Ocean, the geography, climate and wildlife of the country are extremely diverse. At 3.8 million square miles and with over 324 million people, the United States is the worlds third- or fourth-largest country by area, third-largest by land area. It is one of the worlds most ethnically diverse and multicultural nations, paleo-Indians migrated from Asia to the North American mainland at least 15,000 years ago. European colonization began in the 16th century, the United States emerged from 13 British colonies along the East Coast. Numerous disputes between Great Britain and the following the Seven Years War led to the American Revolution. On July 4,1776, during the course of the American Revolutionary War, the war ended in 1783 with recognition of the independence of the United States by Great Britain, representing the first successful war of independence against a European power. The current constitution was adopted in 1788, after the Articles of Confederation, the first ten amendments, collectively named the Bill of Rights, were ratified in 1791 and designed to guarantee many fundamental civil liberties. During the second half of the 19th century, the American Civil War led to the end of slavery in the country. By the end of century, the United States extended into the Pacific Ocean. The Spanish–American War and World War I confirmed the status as a global military power. The end of the Cold War and the dissolution of the Soviet Union in 1991 left the United States as the sole superpower. The U. S. is a member of the United Nations, World Bank, International Monetary Fund, Organization of American States. The United States is a developed country, with the worlds largest economy by nominal GDP. It ranks highly in several measures of performance, including average wage, human development, per capita GDP. While the U. S. economy is considered post-industrial, characterized by the dominance of services and knowledge economy, the United States is a prominent political and cultural force internationally, and a leader in scientific research and technological innovations. In 1507, the German cartographer Martin Waldseemüller produced a map on which he named the lands of the Western Hemisphere America after the Italian explorer and cartographer Amerigo Vespucci
3.
Texas
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Texas is the second largest state in the United States by both area and population. Other major cities include Austin, the second most populous state capital in the U. S. Texas is nicknamed the Lone Star State to signify its former status as an independent republic, and as a reminder of the states struggle for independence from Mexico. The Lone Star can be found on the Texan state flag, the origin of Texass name is from the word Tejas, which means friends in the Caddo language. Due to its size and geologic features such as the Balcones Fault, although Texas is popularly associated with the U. S. southwestern deserts, less than 10 percent of Texas land area is desert. Most of the centers are located in areas of former prairies, grasslands, forests. Traveling from east to west, one can observe terrain that ranges from coastal swamps and piney woods, to rolling plains and rugged hills, the term six flags over Texas refers to several nations that have ruled over the territory. Spain was the first European country to claim the area of Texas, Mexico controlled the territory until 1836 when Texas won its independence, becoming an independent Republic. In 1845, Texas joined the United States as the 28th state, the states annexation set off a chain of events that caused the Mexican–American War in 1846. A slave state before the American Civil War, Texas declared its secession from the U. S. in early 1861, after the Civil War and the restoration of its representation in the federal government, Texas entered a long period of economic stagnation. One Texan industry that thrived after the Civil War was cattle, due to its long history as a center of the industry, Texas is associated with the image of the cowboy. The states economic fortunes changed in the early 20th century, when oil discoveries initiated a boom in the state. With strong investments in universities, Texas developed a diversified economy, as of 2010 it shares the top of the list of the most Fortune 500 companies with California at 57. With a growing base of industry, the leads in many industries, including agriculture, petrochemicals, energy, computers and electronics, aerospace. Texas has led the nation in export revenue since 2002 and has the second-highest gross state product. The name Texas, based on the Caddo word tejas meaning friends or allies, was applied by the Spanish to the Caddo themselves, during Spanish colonial rule, the area was officially known as the Nuevo Reino de Filipinas, La Provincia de Texas. Texas is the second largest U. S. state, behind Alaska, though 10 percent larger than France and almost twice as large as Germany or Japan, it ranks only 27th worldwide amongst country subdivisions by size. If it were an independent country, Texas would be the 40th largest behind Chile, Texas is in the south central part of the United States of America. Three of its borders are defined by rivers, the Rio Grande forms a natural border with the Mexican states of Chihuahua, Coahuila, Nuevo León, and Tamaulipas to the south
4.
Harris County, Texas
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Harris County is a county located in the U. S. state of Texas. As of the 2010 census, the population was 4,092,459, making it the most populous county in Texas and its county seat is Houston, the largest city in Texas and fourth-largest city in the United States. The county was founded in 1836 and organized in 1837 and it is named for John Richardson Harris, an early settler of the area. By the July 2016 Census Bureau estimate Harris Countys population had grown to 4,589,928, Harris County is included in the Houston–The Woodlands–Sugar Land Metropolitan Statistical Area. John Richardson Harris, early Harris County settler and founder of Harrisburg, on May 7,1813, he married Jane Birdsall. John and Jane Birdsall Harris settled near Waterloo, New York, in 1819 they were living in Ste. Genevieve, Missouri, where their daughter Mary Jane Harris Briscoe was born, a third son, John Birdsall Harris, was born in 1821. Genevieve Harris met Moses Austin and decided to move to Texas and he came to Texas in his own vessel in 1824 and received title to 4,428 acres of land at the junction of Brays and Buffalo bayous in what is now Harris County. He boarded with William Scott while he built a house on the peninsula between the bayous and a store and warehouse on Buffalo Bayou, in 1826 he employed Francis W. Johnson to lay out the town of Harrisburg. With his brother David Harris, John Harris established a trading post at Bells Landing on the Brazos River. Their sloops and schooners plied between Texas and New Orleans, One of these vessels, the Rights of Man, carried eighty-four bales of cotton to New Orleans in 1828. Harris was building a steam sawmill-gristmill at Harrisburg in 1829, when he went to New Orleans to buy equipment, after his death on August 21,1829, his sawmill and shipping enterprise were operated by his brothers David, Samuel, and William Plunkett Harris. His widow and son DeWitt moved to Texas in 1833, the children came later. Litigation over Harriss estate prevented Harrisburg from becoming the seat of the new Texas government in 1836, when Houston was named instead. According to the U. S. Census Bureau, the county has an area of 1,777 square miles. Both its total area and land area are larger than the state of Rhode Island. 6% of Harris Countys population, black Americans made up 18. 9% of the population. Native Americans made up 0. 7% of Harris Countys population, Asian Americans made up 6. 2% of the population. Pacific Islander Americans made up just 0. 1% of the population, individuals from other races made up 14. 3% of the population, people from two or more races made up 3. 2% of the countys population
5.
Houston
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Houston is the most populous city in the state of Texas and the fourth-most populous city in the United States. With a census-estimated 2014 population of 2.239 million within an area of 667 square miles, it also is the largest city in the southern United States and the seat of Harris County. Located in Southeast Texas near the Gulf of Mexico, it is the city of Houston–The Woodlands–Sugar Land. Houston was founded on August 28,1836, near the banks of Buffalo Bayou and incorporated as a city on June 5,1837. The city was named after former General Sam Houston, who was president of the Republic of Texas and had commanded, the burgeoning port and railroad industry, combined with oil discovery in 1901, has induced continual surges in the citys population. Houstons economy has an industrial base in energy, manufacturing, aeronautics. Leading in health care sectors and building equipment, Houston has more Fortune 500 headquarters within its city limits than any city except for New York City. The Port of Houston ranks first in the United States in international waterborne tonnage handled, the city has a population from various ethnic and religious backgrounds and a large and growing international community. Houston is the most diverse city in Texas and has described as the most diverse in the United States. It is home to cultural institutions and exhibits, which attract more than 7 million visitors a year to the Museum District. Houston has a visual and performing arts scene in the Theater District. In August 1836, two real estate entrepreneurs from New York, Augustus Chapman Allen and John Kirby Allen, purchased 6,642 acres of land along Buffalo Bayou with the intent of founding a city. The Allen brothers decided to name the city after Sam Houston, the general at the Battle of San Jacinto. The great majority of slaves in Texas came with their owners from the slave states. Sizable numbers, however, came through the slave trade. New Orleans was the center of trade in the Deep South. Thousands of enslaved African Americans lived near the city before the Civil War, many of them near the city worked on sugar and cotton plantations, while most of those in the city limits had domestic and artisan jobs. Houston was granted incorporation on June 5,1837, with James S. Holman becoming its first mayor, in the same year, Houston became the county seat of Harrisburg County and the temporary capital of the Republic of Texas
6.
ZIP Code
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ZIP Codes are a system of postal codes used by the United States Postal Service since 1963. The term ZIP, an acronym for Zone Improvement Plan, was chosen to suggest that the travels more efficiently, and therefore more quickly. The basic format consists of five numerical digits, an extended ZIP+4 code, introduced in 1983, includes the five digits of the ZIP Code, a hyphen, and four additional digits that determine a more specific location within a given ZIP Code. The term ZIP Code was originally registered as a servicemark by the U. S. Postal Service, USPS style for ZIP is all caps and the c in code is also capitalized, although style sheets for some publications use sentence case or lowercase. The early history and context of postal codes began with postal district/zone numbers, the United States Post Office Department implemented postal zones for numerous large cities in 1943. For example, Mr. John Smith 3256 Epiphenomenal Avenue Minneapolis 16, by the early 1960s a more organized system was needed, and on July 1,1963, non-mandatory five-digit ZIP Codes were introduced nationwide. Three months later, on October 1,1963, the U. S, an earlier list in June had proposed capitalized abbreviations ranging from two to five letters. The abbreviations have remained unchanged, with one exception, according to the historian of the U. S. Robert Moon, an employee of the post office, is considered the father of the ZIP Code, he submitted his proposal in 1944 while working as a postal inspector. The post office gives credit to Moon only for the first three digits of the ZIP Code, which describe the sectional center facility or sec center, an SCF is a central mail processing facility with those three digits. The SCF sorts mail to all post offices with those first three digits in their ZIP Codes, the mail is sorted according to the final two digits of the ZIP Code and sent to the corresponding post offices in the early morning. Sectional centers do not deliver mail and are not open to the public, Mail picked up at post offices is sent to their own SCF in the afternoon, where the mail is sorted overnight. The United States Post Office used a character, which it called Mr. ZIP. He was often depicted with a such as USE ZIP CODE in the selvage of panes of stamps or on labels contained in, or the covers of. In 1983, the U. S. Postal Service introduced an expanded ZIP Code system that it called ZIP+4, often called plus-four codes, add-on codes, or add ons. But initial attempts to promote use of the new format met with public resistance. For Post Office Boxes, the rule is that each box has its own ZIP+4 code. However, there is no rule, so the ZIP+4 Code must be looked up individually for each box. It is common to use add-on code 9998 for mail addressed to the postmaster,9999 for general delivery, for a unique ZIP Code, the add-on code is typically 0001
7.
Downtown Houston
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Downtown Houston is Houstons central business district, containing the headquarters of many prominent companies. There is a network of pedestrian tunnels and skywalks connecting the buildings of the district. The tunnel system is home to restaurants, shops and services. What is now Downtown made up almost all of the City of Houston until expansions of the city limits in the early 20th century, Downtown Houston was the original founding point of the city. After the Texas Revolution, two New York real estate promoters, John Kirby Allen and Augustus Chapman Allen, purchased 6,642 acres of land from Thomas F. L, parrot and his wife, Elizabeth, for $9,428. The Allen brothers first landed in the area where the White Oak Bayou and Buffalo Bayou meet, gail Borden, Jr. a city planner, laid out wide streets for the town. The city was granted incorporation by the Texas legislature on June 5,1837, Houston was the temporary capital of Texas. In 1840, the town was divided into four wards, each with different functions in the community, by 1906 what is now Downtown was divided among six wards. The wards are no longer political divisions, but their names are used to refer to certain areas. Houston became a choice, as only the most powerful storms were able to reach the city. The second came a year later with the 1901 discovery of oil at spindletop, shipping and oil industries began flocking to east Texas, many settling in Houston. From that point forward the area grew substantially, as many skyscrapers were constructed, in the 1980s, however, economic recession canceled some projects and caused others to be scaled back, such as the Bank of the Southwest Tower. Ralph Bivins of the Houston Chronicle wrote that Fox said that area was a neighborhood of Victorian-era homes. Bivins said that the construction of Union Station, which occurred around 1910, hotels opened in the area to service travelers. Afterwards, according to Bivins, the area began a downward slide toward the skid row of the 1990s. Passenger trains stopped going to Union Station in 1974, the construction of Interstate 45 in the 1950s separated portions of the historic Third Ward from the rest of the Third Ward and brought those portions into Downtown. Beginning in the 1960s the development of the 610 Loop caused the focus of the Houston area to move away from Downtown Houston, in the mid-1980s, the bank savings and loan crisis forced many tenants in Downtown Houston buildings to retrench, and some tenants went out of business. Barna said that this development further caused Downtown Houston to decline, the Gulf Hotel fire occurred in 1943
United States
Texas
Houston
Theater District, Houston 
