Geographic Information Systems (GIS) | Earthdata

Apr 19, 2021 · GIS allows you to link databases with maps to create dynamic displays. Remote sensing, the art and science of making measurements of the Earth using airborne- or satellite-based sensors, is used in GIS. Remotely sensed data, integrated within a GIS, can be visualized to obtain information about the data; and a GIS provides specializedGet price

GIS Data - Data and Tools

Domestic wells provide drinking water supply for approximately 40 million people in the United States. Knowing the location of these wells, and the populations they serve, is important for identifying heavily used aquifers, locations susceptible to contamination, and populations potentially impacted by poor-quality groundwater.Get price

Geographic Information Systems (GIS) Mapping Tools

Geographic Information Systems (GIS) Mapping Tools Open Data Portal. PA DEPGIS open data portal provides access to all of our publicly published, non-sensitive GIS data, which includes over 300 data layers relative to abandoned mine lands, air quality, water pollution control, coal mining, hazardous waste, operations, oil gas, streams and lakes, industrial minerals mining, integratedGet price

More About GIS Error, Accuracy, and Precision | GEOG 469

The Importance of Error, Accuracy, and PrecisionSome Basic DefinitionsTypes of ErrorSources of Inaccuracy and ImprecisionThe Problems of Propagation and CascadingBeware of False Precision and False Accuracy!The Dangers of Undocumented DataUntil quite recently, people involved in developing and using GIS paid little attention to the problems caused by error, inaccuracy, and imprecision in spatial datasets. Certainly, there was an awareness that all data suffers from inaccuracy and imprecision, but the effects on GIS problems and solutions was not considered in great detail. Major introductions to the field such as C. Dana TomlinGeographic Information Systems and Cartographic Modeling (1990), Jeffrey Star and John EstesGeographic Information Systems: An Introduction (1990), and Keith ClarkeAnalytical and Computer Cartography(1990) barely mention the issue. This situation has changed substantially in recent years. It is now generally recognized that error, inaccuracy, and imprecision can "make or break" many types of GIS projects. That is, errors left unchecked can make the results of a GIS analysis almost worthless. The irony is that the problem of error is it devolves from one of the greatest strengths of GIS...Get price

Measuring and Monitoring | USGS.gov

Measuring and Monitoring. Measurements of land-surface elevations, aquifer-system compaction, and water levels are used to improve our understanding of the processes responsible for changes in the elevation of the landsurface. Elevation or elevation-change measurements are fundamental to monitoring land subsidence, and have been measured by using interferometric synthetic aperture radar (InSAR), continuous GPS (CGPS) measurements, campaign global positioning system (GPS) surveying, andGet price

Overview - Maps - USGS

The GAMA-PBP Public-Supply Well Results data viewer allows the user to visualize and download California water-quality data and trends for1974 - 2014. Groundwater-quality data for 38 inorganic constituents are captured and can be downloaded for individual sites or by grid cell.Get price

Interactive Map of Air Quality Monitors | US EPA

Jan 30, 2019 · The AirData Air Quality Monitors app is a mapping application available on the web and on mobile devices that displays monitor locations and monitor-specific information. It also allows the querying and downloading of data daily and annual summary data.Get price

Scale of measurement - GIS Wiki | The GIS Encyclopedia

Sep 10, 2018 · Stevens' Scales of Measurement or level of measurement is a system for classifying attribute data into four categories, developed by psychologist Stanley Smith Stevens and first published in 1946. [1] [2] Stevens called his four scales nominal , ordinal , interval , and ratio , so the system is often called "NOIR."Get price

GIS Data Center - Mecklenburg County Government

Mecklenburg County GIS hosts an Open Data Portal called Open Mapping in which the public can browse for and download GIS Mapping layers called shapefiles (zipped) for personal use. Please note: Shapefiles are comprised of multiple files. The DBF file of a shapefile can be loaded into excel and viewed if map data viewing capabilities are not needed.Get price

USGS Water-Quality Data for the Nation

The USGS collects and analyzes chemical, physical, and biological properties of water, sediment and tissue samples from across the Nation. The Water Data for the Nation discrete sample data base is a compilation of over 4.4 million historical water quality analyses in the USGS district data bases through September 2005. The discrete sample data is a large and complex set of data that has been collected by a variety of projects ranging from national programs to studies in small watersheds.Get price

Measurement - GIS Wiki | The GIS Encyclopedia

HistoryStandardsUnits and SystemsSome Special NamesDifficultiesDefinitions and Theoriesin PhysicsReferencesExternal LinksThe word "measurement" is derived from the Greek word "metron"which means a limited proportion. The history of measurements is a topic within the history of science and technology.Get price

Access GIS Data Viewer | Guilford County, NC

GIS site updates; 5/1/20 – Completed the installation of our Enterprise Architecture.. 6/6/2019 – Added 2018 Orthoimagery to the site. Please click here for more information.Get price

Spatial Data Quality: An Introduction - GIS Lounge

Jan 11, 2008 · Data quality is a pillar in any GIS implementation and application as reliable data are indispensable to allow the user obtaining meaningful results. Spatial Data quality can be categorized into Data completeness, Data Precision, Data accuracy and Data Consistency. Data Completeness: It is basically the measure of totality of features.Get price

CDC - GIS - Geospatial Data Resources

Mar 20, 2019 · Measures of vital health factors, including high school graduation rates, obesity, smoking, unemployment, access to healthy foods, the quality of air and water, income inequality, and teen births in nearly every county in America. Data.gov external iconGet price

Lesson 7 - Understanding GIS Error, Accuracy, and Precision

One of the feature benefits of GIS is the ability to use information from many sources, so the need to have an understanding of the quality of the data is extremely important. Accuracy in GIS is the degree to which information on a map matches real-world values.Get price

USGS Water Resources: About USGS Water Resources

Some areas, notably major cities in the west, were recompiled at a scale of 1:100K. The coverage was compiled to provide the National Water Quality Assessment (NAWQA) study units with an intermediate- scale river basin boundary for extracting other GIS data layers. The coverage is available on line, at no charge, via links from the file.Get price

Wind Resource Data, Tools, and Maps | Geospatial Data - NREL

Wind Resource MapsWind Resource Geospatial DataCite The Maps and DataThese static maps illustrate multiyear average wind speeds at various heights derived from NRELWIND Toolkit. They may be used in electronic and printed publications with proper citation. Note: The publication dates listed below don't necessarily reflect the publication dates of the data therein.Get price

Geographic Information System - US Army Environmental Command

USAEC GIS Support. In addition to the GIS initiatives managed by USAEC, the GIS team supports USAEC and the Army community by providing technical consultation, performing geospatial data analyses, reviewing contract language for GIS-related work, providing training to Project Managers on the principles of GIS, and creating professional cartographic products.Get price

King County GIS Center - King County

Mar 26, 2020 · The King County GIS Center manages the King County Geographic Information System (KCGIS), King County’s cooperative, multi-department, enterprise GIS. We provide efficient, high-quality GIS leadership, coordination, infrastructure, and services to meet the business needs of our customers and clients in King County government, the Puget SoundGet price

GIS (Geographic Information System) | National Geographic Society

Jun 21, 2017 · A geographic information system (GIS) is a computer system for capturing, storing, checking, and displaying data related to positions on Earth’s surface. By relating seemingly unrelated data, GIS can help individuals and organizations better understand spatial patterns and relationships.Get price

Maps GIS | Snohomish County, WA - Official Website

Information Technology Administration Building - East 3000 Rockefeller Avenue, M/S 709 Everett, WA 98201 View Map (PDF) (see A) [email protected] Phone: 425-262-2150Get price

GIS Mapping Applications - Yavapai County, Arizona

11x11 inches, February 2020. For help with any of these Mapping Applications, please visit the GIS Mapping Application FAQ’s page. Contact Us: Email us at [email protected] or call weekdays 8 am to 5 pm except holidays at 928-771-3169 (in Prescott).Get price

USGS Groundwater Data for the Nation

Measurements are commonly recorded at a fixed interval of 15- to 60-minutes and transmitted to the USGS every hour. Values may include "Approved" (quality-assured data that may be published) and/or more recent "Provisional" data (of unverified accuracy and subject to revision). Most current data are provisional.Get price

GIS and Maps | AustinTexas.gov

Property Profile answers questions about specified properties and development regulations within the City. With Property Profile you can search for information, see aerial images including street views, create custom maps, download data, and run a report detailing information about a specifiedGet price

Accuracy and precision - GIS Wiki | The GIS Encyclopedia

Accuracy Versus Precision; The Target AnalogyQuantifying Accuracy and PrecisionAccuracy and Precision in Binary ClassificationAccuracy and Precision in Psychometrics and PsychophysicsAccuracy and Precision in Information SystemsSee AlsoReferencesExternal LinksAccuracy is the degree of veracity while precision is the degree of reproducibility.[citation needed]The analogy used here to explain the difference between accuracy and precision is the target comparison. In this analogy, repeated measurements are compared to arrows that are shot at a target. Accuracy describes the closeness of arrows to the bullseye at the target center. Arrows that strike closer to the bullseye are considered more accurate. The closer a systemmeasurements to the accepted value, the more accurate the system is considered to be. To continue the analogy, if a large number of arrows are shot, precision would be the size of the arrow cluster. (When only one arrow is shot, precision is the size of the cluster one wouldexpect if this were repeated many times under the same conditions.) When all arrows are grouped tightly together, the cluster is considered precise since they all struck close to the same spot, if not necessarily near the bullseye. The measurements are...Get price

GIS Mapping Software, Location Intelligence Spatial

Esri’s GIS mapping software is the most powerful mapping spatial analytics technology available. Learn how businesses are using location intelligence to gain a competitive advantage.Get price

USGS Water Data for the Nation

The USGS investigates the occurrence, quantity, quality, distribution, and movement of surface and underground waters and disseminates the data to the public, State and local governments, public and private utilities, and other Federal agencies involved with managing our water resources. About Us Help TutorialGet price

Soil Geography | NRCS Soils

Soil Colors — Maps that show soil color at various depths for individual States and the Continental United States. • Soil Colors posters for each State Map of the Month — The National Soil Survey Center is now featuring a display called “Map of the Month” to generate awareness about historic soil survey maps.Get price

Water Resources - Data Tools - USGS.gov

Since 1969, USGS has collected water-quality data along the deep-channel longitudinal axis of the San Francisco Bay-Delta system at 37 fixed locations spaced 3-6 kilometers apart. The Water Quality of San Francisco Bay Data Query provides access to the entire dataset.Get price