• Soil quality assessment using GIS-based chemometric approach

    This paper is a comprehensive assessment of the quality of soil in the Nakhlak mining district in Central Iran with special reference to potentially toxic metals. In this regard, an integrated approach involving geostatistical, correlation matrix, pollution indices, and chemical fractionation measurement is used to evaluate selected potentially toxic metals in soil samples.

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  • (PDF) Calibration of River Hydraulic Model Combined with GIS

    Calibration of River Hydraulic Model Combined with GIS Analysis using Ground-Based Observation Data May 2013 Research Journal of Applied Sciences, Engineering and Technology 3(13):456-463

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  • (PDF) Air pollution mapping using remote sensing, GIS and

    a) Air quality data: There are ten stations distributed around the city to measure airqual ity parameters such as CO, SO2,NO2, CH4,NO2,THC,DUSTC,NMHC,NOx in an hourly base.

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  • An integrated GIS-based Ordered Weighted Averaging analysis

    Jun 01, 2019 · A new model is used to evaluate the solar energy in Iran. • To evaluate solar energy potential a risk analysis is added to GIS-based method. • An Order Weight Averaging is utilized for first time in solar energy assessment.

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  • GIS CALIBRATION PROCEDURES

    investigate the GIS calibration, as questions had been raised regarding its pointing, a clear degradation in the performance of the GIS 1 detector, and the quality of the latest calibration of 2003, which was based on the known characteristics of Microchannel Plate (MCP) aging and observed line widths and intensities in the major spectral lines.

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  • (PDF) CALIBRATING GEODETIC INSTRUMENTS

    Heister, H. and Slaboch, V. (2002): Report on Standards, Quality Assurance and Calibration -FIG WG 5.1 Activities in 1998-2002, FIG XXII International Congress, Washington DC, USA. A Calibration

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  • Guidance for Geospatial Data Quality Assurance Project Plans

    The EPA Quality System defined in EPA Order 5360.1 A2, Policy and Program Requirements for the Mandatory Agency-wide Quality System (EPA 2000d), includes coverage of environmental data or “any measurement or information that describe environmental processes, location, or conditions; ecological or health effects and consequences; or the

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  • 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...

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  • GIS Data: A Look at Accuracy, Precision, and Types of Errors

    Nov 06, 2011 · Related Articles about GIS Data Quality. Spatial Data Quality: An Introduction; About the Author. Manuel S Pascual (born in Sevilla, Spain) has a Master’s degree in Geography from the University of Seville with majors in Cartography and Photogrammetry. Pascual did his post graduate work at UNM with an emphasis in GIS and Remote Sensing.

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  • 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...

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  • Iran. J. Radiat. Res., 2012; 10(1): 43-51 A Comparison of

    calibration and/or measurement of clinical beams. These protocols are based on the use of an ionization chamber in terms of absorbed dose to water in standard labora-tories and reference beam quality. Absorbed doses to water and beam quality factors were measured and then their ratios of AAPM TG-51 / IAEA TRS-398 were calcu-lated.

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  • Study on Groundwater Quality Using Geographic Information

    This study involves the analysis of water resources pollution data using Geographic Information System (GIS), which is a subset of the purposes such as: study on the status (situaion) of the aquifer, the natural and man-made effects on aquifer quality, evaluation and investigation of quality monitoring results of Ardabil aquifer, study on quality limitations by comparing the results of

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  • 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.

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  • Lesson 7 - Understanding GIS Error, Accuracy, and Precision

    Other errors in quantitative accuracy may occur from faulty instrument calibration used to measure specific features such as altitude, soil or water pH, or atmospheric gases. Mistakes made in the field or laboratory may be undetectable in the GIS project unless the user has conflicting or corroborating information available. 4.2.3.

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  • (PDF) A GIS Model for Urban Air Quality Analysis

    From GIS distribution maps for SO 2 , NO 2 , H 2 S and VOCs pollutants , it was found that the value of these gasses were changed from one location to another according to the quantity and quality

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  • BASINS Framework and Features | Environmental Modeling

    BASINS provides a framework that brings together modeling tools and environmental spatial and tabular data into a geographic information system (GIS) interface. BASINS can be used for investigations and analysis on a variety of geospatial scales from small watersheds within a single municipality, to a large watershed across several states.

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  • 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."

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  • Quality measurement indicators for Iranian Health Centers.

    Feb 10, 2015 · 1. Med J Islam Repub Iran. 2015 Feb 10;29:177. eCollection 2015. Quality measurement indicators for Iranian Health Centers. Moslehi S(1), Atefi Manesh P(2), Sarabi Asiabar A(3).

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  • Details of 'Geographical Indication' of Iranian agricultural

    TEHRAN, Feb. 29 (MNA) – Implementation of the Geographical Indication (GI) project, recently launched in cooperation with FAO in Iran, will lead to the development of agricultural tourism related to the GI.

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  • 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.

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  • Accuracy of Spatial Data Used In Geographic Information Systems

    Typically, GIS consultants help the potential users of GIS to identify their needs. They also advise them about the capabilities of the hardware and software when selecting a GIS, the personnel required, etc. Usually, developers, vendors, consultants, and users of GIS do not talk about the quality and accuracy of the data they are using in

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  • NIST Quality Manual

    Aug 09, 2011 · The quality management system described in this manual covers measurement (calibration and reference material) services provided to customers both internal and external to NIST. In general, the scope of the NIST quality management system for measurement services encompasses all services

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  • Calibrating Survey Instruments | GIM International

    Jul 07, 2007 · The calibration curve obtained can be modelled to considerably improve field measurements. At the ESRF, the enlarged uncertainty for these calibrations is 0.17mm for a 2-50m EDM calibration with instrument resolution of 0.1mm, and 0.05mm for a 0.3-50m laser-tracker distance meter calibration.

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  • Assessing the performance of GIS- based machine learning

    Assessing the performance of GIS- based machine learning models with different accuracy measures for determining susceptibility to gully erosion Sci Total Environ . 2019 May 10;664:1117-1132. doi: 10.1016/j.scitotenv.2019.02.093.

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  • Dilution of precision (navigation) - Wikipedia

    Positional measurements could be used for calculations, but the fix quality could still be improved. A more open view of the sky is recommended. 10-20 Fair Represents a low confidence level. Positional measurements should be discarded or used only to indicate a very rough estimate of the current location. 20 Poor

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  • GIS, REMOTE SENSING AND FIELD MEASUREMENTS FOR ESTIMATING

    surveys and field measurements, and discharge estimation using Manning’s equation. The methodological procedure for computation of sub-watershed disc harges at above locations has been depicted as flow chart in Figure 2. 3.1 Geo database creation The ArcGIS 9.2 has been used for database creation and GIS analysis.

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  • Pipe2020: Gas (Gas Analysis) | KYPipe

    Pipe2020: Gas analyzes steady, one-dimensional, isothermal flow for ideal and non-ideal, variable-density gases. The module includes the ability to account for

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  • Overview of Air Quality Monitoring in Accra, Ghana-2

    Measures PM10, PM2.5 and PM1 Line power units measure every 5 minutes, solar every 15 minutes Data transmitted in parallel to Clarity for performance/ troubleshooting and to AirNow-Ghana system using an API Measures PM10, PM2.5 Line power, measures every 80 seconds and records in text file to SD card (offline mode)

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  • Data.GISS: Photopolarimetry Measurements of Aerosols

    Polarization is a relative measurement which allows for simple and extremely accurate calibration. A well designed polarimetric instrument can be calibrated to 0.2% in absolute polarimetric accuracy. By contrast a good absolute radiometric accuracy is considered to be 4%.

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