Description: These airport data are from the Airports and Heliports database, developed by the U.S. Geological Survey and Montana Base Map Service Center. Attribute data are provided on basic physical characteristics, location, and contact information for these landing facilities. Attributes were derived from a variety of sources.
Service Item Id: 6c33f10dc55f4f12a3f8dcf747bad2f0
Copyright Text: U.S. Geological Survey, Montana State Library
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Description: These heliport data are from the Airports and Heliports database, developed by the U.S. Geological Survey and Montana Base Map Service Center. Attribute data are provided on basic physical characteristics, location, and contact information for these landing facilities. Attributes were derived from a variety of sources.
Service Item Id: 6c33f10dc55f4f12a3f8dcf747bad2f0
Copyright Text: U.S. Geological Survey, Montana State Library
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Description: These are the General Commercial apiaries from the Montana Department of Agriculture's registered apiary database. State law requires that registered apiaries with more than 5 hives must be at least 3 miles from each other.
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Description: The Montana Schools layer is comprised of public and private schools in Montana based on Montana Office of Public Instruction (OPI) data. All public and private schools accredited by OPI are included, as well as non-accredited private schools that have been reported to county school superintendents. Therefore, this is not a complete database of all private schools in Montana.
Service Item Id: 6c33f10dc55f4f12a3f8dcf747bad2f0
Copyright Text: Montana Office of Public Instruction, Montana State Library
Color: [0, 0, 0, 255] Background Color: N/A Outline Color: N/A Vertical Alignment: bottom Horizontal Alignment: center Right to Left: false Angle: 0 XOffset: 0 YOffset: 0 Size: 8 Font Family: Arial Font Style: normal Font Weight: normal Font Decoration: none
Description: This layer has point locations, elevations, and estimated populations for 629 Montana towns. Where a town corresponds to an incorporated place or a Census Designated Place, the 2010 population value is the official Census population of the place. The 2010 population of other towns are based on the populations of the 2010 Census Blocks that an area around the town covers. Every town also has estimated 1990 and 2000 populations of the area currently defined as representing the town. For incorporated and Census Designated Places, these estimates will generally not equal the 1990 or 2000 Census populations of those places because their boundaries may have changed since the earlier Censuses.The towns selected for inclusion in this layer are the ones that were shown on 1:250,000 scale U.S. Geological Survey maps in the 1970s and on the Montana Highway Map published by the state in the 1990s. Some Census Designated Places that seem to represent suburban regions or rural subdivisions are not included in this layer. In some cases, there is disagreement between the names and/or extents of these towns and the Census Designated Places that cover all or part of the same area. These discrepancies are noted in the Alt_Name field of the layer.
Service Item Id: 6c33f10dc55f4f12a3f8dcf747bad2f0
Copyright Text: Montana State Library, U.S. Census Bureau, U.S. Geological Survey
Description: This layer contains the locations of historic and current USGS streamflow gauges for Montana. Each record has a URL to bring up the appropriate USGS data page for the station.
Description: These data were obtained from the National Inventory of Dams and the Geographic Names Information System. They were assembled by Montana Fish, Wildlife, and Parks in 2002. Limited review and corrrections were done at the Montana State Library in 2003.
Service Item Id: 6c33f10dc55f4f12a3f8dcf747bad2f0
Copyright Text: U.S. Army Corps of Engineers, U.S. Geological Survey, Montana Fish, Widlife, and Parks, Montana State Library
Description: This layer is for use with the towns layer. It shows the regions used to estimate populations for 629 Montana towns and contains the population estimates from the towns layer. Where a town corresponds to an incorporated place or a Census Designated Place, the 2010 population value is the official Census population of the place. The 2010 population of other towns are based on the populations of the 2010 Census Blocks that an area around the town covers. Every town also has estimated 1990 and 2000 populations of the area currently defined as representing the town. For incorporated and Census Designated Places, these estimates will generally not equal the 1990 or 2000 Census populations of those places because their boundaries may have changed since the earlier Censuses.
The towns selected for inclusion in this layer are the ones that were shown on 1:250,000 scale U.S. Geological Survey maps in the 1970s and on the Montana Highway Map published by the state in the 1990s. Some Census Designated Places that seem to represent suburban regions or rural subdivisions are not included in this layer.
In some cases, there is disagreement between the names and/or extents of these towns and the Census Designated Places that cover all or part of the same area. These discrepancies are noted in the Alt_Name field of the layer.
Service Item Id: 6c33f10dc55f4f12a3f8dcf747bad2f0
Copyright Text: US Census Bureau, Montana State Library
Description: These data are a re-classification of the population density of Census Blocks into estimated septic system densities of H, M, or L (High, Medium, or Low).
Areas within incorporated cities and towns are reclassified as "C", which means that the area is assumed to have a municipal waste disposal system rather than individual septic systems.
High density is defined as being areas with over 750 persons per square mile. Medium density is defined as being areas with 125 to 750 persons per square mile. Low density is defined as being areas with less than 125 persons per square mile.
The Federal Safe Water Drinking Act requires states to implement Source Water Assessment Programs that analyze existing and potential threats to the quality of the states' public water supplies. The Montana Source Water Protection Program (SWPP) has complied with this by publishing source water delineation and assessment reports for each public water supply. A required element of each assessment is an estimate of the septic system density in the source region. The State Library developed these data under the guidance of the SWPP and published it in the State Library Digital Atlas application so that SWPP personell and the public could view a map of the septic system density around any public water supply.
Service Item Id: 6c33f10dc55f4f12a3f8dcf747bad2f0
Copyright Text: Montana State Library, U.S. Census Bureau
Description: This layer is the union of the photo date index layers for the 2005, 2009, 2011, and 2013 National Agricultural Imagery Program (NAIP) air photo collections. It allows users of the Digital Atlas to click on a location and have a single pane where they can see the dates of all four photos that cover the location.
Description: This is a composite of the photo date layers for the 2005, 2009, 2011, and 2013 NAIP aerial photos. The layer is for display of photo dates in the Digital Atlas information window and is not drawn on the map.