![]() US Topo is the current USGS topographic map series for the Nation. ![]() Visit Historical Topographic Maps - Preserving the Past for more information.Ģ. The Historical Topographic Map Collection (HTMC) is the set of scanned images of USGS topographic quadrangle maps originally published as paper documents in the period 1884-2006. USGS topographic maps fall into three primary product categories:ġ. Values above or below 100 represent above-average wealth or below-average wealth compared to the national level.Learn more. It represents the wealth of the area relative to the national level. The Wealth Index is based on a number of indicators of affluence including average household income and average net worth, but it also includes the value of material possessions and resources.The % of Income for Mortgage quantifies the percentage of median household income dedicated to mortgage payments on a home priced at the median value (assuming a 30-year mortgage and a 20% down payment).Values above 100 indicate increased affordability, while values below 100 indicate decreased affordability. The Housing Affordability Index base is 100 and represents a balance point where a resident with a median household income can normally qualify to purchase a median price home.An area's diversity index increases to 100 when the population is evenly divided into two or more race/ethnic groups. If an area's entire population belongs to one race AND one ethnic group, then the area has zero diversity. ![]()
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