Calibration - GIS Wiki | The GIS Encyclopedia

May 07, 2011 · A very common interval in the United States for 8–12 hours of use 5 days per week is six months. That same instrument in 24/7 usage would generally get a shorter interval. The assignment of calibration intervals can be a formal process based on the results of previous calibrations. The next step is defining the calibration process.Get price

Using Geographic Information Systems (GIS) | NWCG

North American Datum of 1927 (NAD27): Local datum well suited to the United States, Canada, Mexico, and the Caribbean. Uses the Clarke 1866 spheroid. Uses the Clarke 1866 spheroid. North American Datum of 1983 (NAD83): An earth-centered datum that corrects NAD27 coordinates based on both earth and satellite measurements.Get price

GIS Data - Data and Tools - USGS

May 28, 2020 · 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

National Geodetic Survey - Survey Marks and Datasheets

Antenna Calibration Data; Remote Sensing; Storm Imagery; Coastal Imagery; Shoreline Data Explorer; Orthomosaics; Lidar; Aeronautical Data; Gravity Data; Orbit Data; Tools. Process GPS Data (OPUS) Coordinate Conversion and Transformation Tool (NCAT) Geodetic Tool Kit; Geodetic Software; Web Services; Vertical Datum Conversions (VDATUM) GPSGet price

Shapefile - The United States Census Bureau

A shapefile is a geospatial data format for use in geographic information system (GIS) software. For KML versions of these files, please see our Cartographic Boundary Files - KML page. For state-based and national congressional district cartographic boundary files for the 103rd through 110th Congresses, see our FTP site .Get price

USGS EROS Archive - Aerial Photography - High Resolution

High resolution orthorectified images combine the image characteristics of an aerial photograph with the geometric qualities of a map. An orthoimage is a uniform-scale image where corrections have been made for feature displacement such as building tilt and for scale variations caused by terrain relief, sensor geometry, and camera tilt.Get price

Universities for Masterin Geo-informatics/GIS - Geoawesomeness

Mar 03, 2020 · [First published: July 14, 2017; Last updated: March 3, 2020] Are you thinking about pursuing Master’s in GIS, Remote Sensing or Geoscience? Never think twice, we have made a comprehensive list of many universities for Master’s in GIS, Geo-informatics, and related fields.Get price

Differential GPS - Wikipedia

A Differential Global Positioning System (DGPS) is an enhancement to the Global Positioning System (GPS) which provides improved location accuracy, in the range of operations of each system, from the 15-metre (49 ft) nominal GPS accuracy to about 1–3 centimetres (0.39–1.18 in) in case of the best implementations.Get price

GIS-based spatial modeling of COVID-19 incidence rate in the

Aug 01, 2020 · On March 17, 2020, all fifty states across the United States had confirmed cases of COVID-19 (Abir et al., 2020). On March 26, 2020, the United States became the leading country in the number of cases worldwide, replacing Italy that was previously in the lead of COVID-19 cases ( Center for Infectious Disease Research and Policy, 2020 ).Get price

Office of Surface Mining Reclamation and Enforcement (OSMRE)

Apr 02, 2021 · The U.S. GovernmentOfficial Website for the Office of Surface Mining Reclamation and Enforcement (OSMRE). OSMREbusiness practices are to reclaim abandoned mine lands (Title IV), regulate active coal mines (Title V), and apply sound science through technology transfer.Get price

USDA:NRCS:Geospatial Data Gateway:Home

All states have natural color and color infrared CCMs with Seamline (Index) Shapefiles available. As of December 31, 2019 the Raster Soil Survey datasets are only available through the Direct Download option on the home page and are no longer available through the Gateway ordering process.Get price

United States | MapChart

Add the title you want for the maplegend and choose a label for each color group.Change the color for all states in a group by clicking on it. Drag the legend on the map to set its position or resize it.Get price

NRCS Surveying | NRCS Iowa

Trimble Access - Site Calibration: A site calibration is used to allow GNSS equipment to survey using a local coordinate system. 6/15/2012: Output for GIS: Export shapefile information from a georeferenced survey for use in GIS. 8/23/2016: NRCS Ia UTMif Projection file (zipped) Unzip the projection file for use with shapefiles exported fromGet price

National Weather Service

Thunderstorms in the Central Plains; Below Average Temperatures in the East. Storms capable of producing large hail and a few strong wind gusts will be possible from central Nebraska into northern Kansas.Get price

United States Geological Survey - Wikipedia

The United States remains virtually the only developed country in the world without a standardized civilian topographic map series in the standard 1:25,000 or 1:50,000 metric scales, making coordination difficult in border regions (the U.S. military does issue 1:50,000 scale topo maps of the continental United States, though only for use byGet price

Baseline (surveying) - GIS Wiki | The GIS Encyclopedia

In the United States Public Land Survey System, a baseline is the principal east-west line that divides survey townships between north and south. The baseline meets its corresponding meridian at the point of origin, or initial point, for the land survey. For example, the baseline for Nebraska and Kansas is shared as the border for both statesGet price

Remote Land Sensing and Landsat - Real-time Data - USGS

The USGS Earth Resources Observation and Science (EROS) Center produces near-real-time estimates of annual herbaceous land cover for the Great Basin, Snake River Plain, Wyoming, and contiguous areas in the United States.Get price

Optical Sensors | GEOG 480: Exploring Imagery and Elevation

In the United States, laboratory calibration of film aerial cameras is performed by the US Geological Survey, Optical Science Laboratory, in Reston, VA. If you are ever in that area, you can arrange for a visit to this unique and interesting facility; the services provided there have ensured the quality and accuracy of photogrammetricallyGet price

Calibration Services | Leica Geosystems

Calibration Certificates. The demand for calibration certificates confirming the measurement quality of surveying equipment is increasing because more and more surveying companies or their contractors are becoming ISO 9001 certified.Get 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

Leica Zeno Mobile | Leica Geosystems

Leica Zeno Mobile is an Android app available on selected Android phones and tablets. The aim of Zeno Mobile is to keep things simple whilst still offering the user a host of professional data capture functions to increase productivity in the field.Get price

USGS Water Resources NSDI Node

Spatial Data Sets Available on the USGS Water Mission Area NSDI Node All data on the Water Mission Area NSDI Node are free to the public. When using data, photographs and maps produced by the U.S. Geological Survey, the USGS requests that reference to or courtesy of the U.S. Geological Survey be noted.Get price

Estimated Nitrate Concentrations in Groundwater Used for

Aug 03, 2020 · Sources: Nitrate concentrations were predicted by the USGS GWAVA-DW model, which used calibration data collected from 1991-2003. Drinking water source data is from USGS' Estimated Use of Water in the United States in 2005. Download the Groundwater data table (excel) (2 pp, 15 K) Top of PageGet price

573,000+ Jobs in California, United States (22,331 new)

Today’s 573,000+ jobs in California, United States. Leverage your professional network, and get hired. New California, United States jobs added daily.Get price


The USGS TRIGA® Reactor (GSTR) is a low–enriched uranium–fueled, pool–type reactor. The mission of the TRIGA® is to support USGS science by providing information on geologic, plant, and animal specimens to advance methods and techniques unique to nuclear reactors.Get price

National Pollutant Discharge Elimination System (NPDES) | US EPA

May 10, 2021 · The NPDES permit program addresses water pollution by regulating point sources that discharge pollutants to waters of the United States. Created in 1972 by the Clean Water Act, the NPDES permit program is authorized to state governments by EPA to perform many permitting, administrative, and enforcement aspects of the program.Get price