FDM 9-20 Spatial Reference Systems
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Shaded Elevation Map of Ohio
STATE OF OHIO DEPARTMENT OF NATURAL RESOURCES DIVISION OF GEOLOGICAL SURVEY Ted Strickland, Governor Sean D. Logan, Director Lawrence H. Wickstrom, Chief SHADED ELEVATION MAP OF OHIO 0 10 20 30 40 miles 0 10 20 30 40 kilometers SCALE 1:2,000,000 427-500500-600600-700700-800800-900900-10001000-11001100-12001200-13001300-14001400-1500>1500 Land elevation in feet Lake Erie water depth in feet 0-6 7-12 13-18 19-24 25-30 31-36 37-42 43-48 49-54 55-60 61-66 67-84 SHADED ELEVATION MAP This map depicts the topographic relief of Ohio’s landscape using color lier impeded the southward-advancing glaciers, causing them to split into to represent elevation intervals. The colorized topography has been digi- two lobes, the Miami Lobe on the west and the Scioto Lobe on the east. tally shaded from the northwest slightly above the horizon to give the ap- Ridges of thick accumulations of glacial material, called moraines, drape pearance of a three-dimensional surface. The map is based on elevation around the outlier and are distinct features on the map. Some moraines in data from the U.S. Geological Survey’s National Elevation Dataset; the Ohio are more than 200 miles long. Two other glacial lobes, the Killbuck grid spacing for the data is 30 meters. Lake Erie water depths are derived and the Grand River Lobes, are present in the northern and northeastern from National Oceanic and Atmospheric Administration data. This digi- portions of the state. tally derived map shows details of Ohio’s topography unlike any map of 4 Eastern Continental Divide—A continental drainage divide extends the past. -
Meyers Height 1
University of Connecticut DigitalCommons@UConn Peer-reviewed Articles 12-1-2004 What Does Height Really Mean? Part I: Introduction Thomas H. Meyer University of Connecticut, [email protected] Daniel R. Roman National Geodetic Survey David B. Zilkoski National Geodetic Survey Follow this and additional works at: http://digitalcommons.uconn.edu/thmeyer_articles Recommended Citation Meyer, Thomas H.; Roman, Daniel R.; and Zilkoski, David B., "What Does Height Really Mean? Part I: Introduction" (2004). Peer- reviewed Articles. Paper 2. http://digitalcommons.uconn.edu/thmeyer_articles/2 This Article is brought to you for free and open access by DigitalCommons@UConn. It has been accepted for inclusion in Peer-reviewed Articles by an authorized administrator of DigitalCommons@UConn. For more information, please contact [email protected]. Land Information Science What does height really mean? Part I: Introduction Thomas H. Meyer, Daniel R. Roman, David B. Zilkoski ABSTRACT: This is the first paper in a four-part series considering the fundamental question, “what does the word height really mean?” National Geodetic Survey (NGS) is embarking on a height mod- ernization program in which, in the future, it will not be necessary for NGS to create new or maintain old orthometric height benchmarks. In their stead, NGS will publish measured ellipsoid heights and computed Helmert orthometric heights for survey markers. Consequently, practicing surveyors will soon be confronted with coping with these changes and the differences between these types of height. Indeed, although “height’” is a commonly used word, an exact definition of it can be difficult to find. These articles will explore the various meanings of height as used in surveying and geodesy and pres- ent a precise definition that is based on the physics of gravitational potential, along with current best practices for using survey-grade GPS equipment for height measurement. -
State Plane Coordinate System
Wisconsin Coordinate Reference Systems Second Edition Published 2009 by the State Cartographer’s Office Wisconsin Coordinate Reference Systems Second Edition Wisconsin State Cartographer’s Offi ce — Madison, WI Copyright © 2015 Board of Regents of the University of Wisconsin System About the State Cartographer’s Offi ce Operating from the University of Wisconsin-Madison campus since 1974, the State Cartographer’s Offi ce (SCO) provides direct assistance to the state’s professional mapping, surveying, and GIS/ LIS communities through print and Web publications, presentations, and educational workshops. Our staff work closely with regional and national professional organizations on a wide range of initia- tives that promote and support geospatial information technologies and standards. Additionally, we serve as liaisons between the many private and public organizations that produce geospatial data in Wisconsin. State Cartographer’s Offi ce 384 Science Hall 550 North Park St. Madison, WI 53706 E-mail: [email protected] Phone: (608) 262-3065 Web: www.sco.wisc.edu Disclaimer The contents of the Wisconsin Coordinate Reference Systems (2nd edition) handbook are made available by the Wisconsin State Cartographer’s offi ce at the University of Wisconsin-Madison (Uni- versity) for the convenience of the reader. This handbook is provided on an “as is” basis without any warranties of any kind. While every possible effort has been made to ensure the accuracy of information contained in this handbook, the University assumes no responsibilities for any damages or other liability whatsoever (including any consequential damages) resulting from your selection or use of the contents provided in this handbook. Revisions Wisconsin Coordinate Reference Systems (2nd edition) is a digital publication, and as such, we occasionally make minor revisions to this document. -
Standards and Guidelines for Cadastral Surveys Using GPS
Table of Contents Foreword ........................................................................................................................................ 3 Part One: Standards for Positional Accuracy ................................................................................ 4 Part Two: GPS Survey Guidelines ................................................................................................ 5 Section One: Field Data Acquisition Methods Section Two: Field Survey Operations and Procedures Cadastral Project Control Cadastral Measurements Section Three: Data Processing and Analysis Section Four: Project Documentation Appendix A: Definitions ............................................................................................................. 16 Appendix B: Computation of Accuracies ................................................................................... 18 Appendix C: References ............................................................................................................. 19 Attachment 1-2 Foreword These Standards and Guidelines provide guidance to the Government cadastral surveyor and other land surveyors in the use of Global Positioning System (GPS) technology to perform Public Land Survey System (PLSS) surveys of the Public Lands of the United States of America. Many sources were consulted during the preparation of this document. These sources included other GPS survey standards and guidelines, technical reports and manuals. Opinions and reviews were also sought from public and -
National Spatial Reference System: "Positioning Changes for 2022"
National Spatial Reference System “Positioning Changes for 2022” Civil GPS Service Interface Committee Meeting Miami, Florida September 24, 2018 Denis Riordan, PSM NOAA, National Geodetic Survey [email protected] U.S. Department of Commerce National Oceanic & Atmospheric Administration National Geodetic Survey Mission: To define, maintain & provide access to the National Spatial Reference System (NSRS) to meet our Nation’s economic, social & environmental needs National Spatial Reference System * Latitude * Scale * Longitude * Gravity * Height * Orientation & their variations in time U. S. Geometric Datums in 2022 National Spatial Reference System (NSRS) Improvements in the Horizontal Datums TIME NETWORK METHOD NETWORK SPAN ACCURACY OF REFERENCE NAD 27 1927-1986 10 meter (1 part in 100,000) TRAVERSE & TRIANGULATION - GROUND MARKS USED FOR NAD83(86) 1986-1990 1 meter REFERENCING (1 part THE in 100,000) NSRS. NAD83(199x)* 1990-2007 0.1 meter GPS B- orderBECOMES (1 part THE in MEANS 1 million) OF POSITIONING – STILL GRND MARKS. HARN A-order (1 part in 10 million) NAD83(2007) 2007 - 2011 0.01 meter 0.01 meter GPS – CORS STATIONS ARE MEANS (CORS) OF REFERENCE FOR THE NSRS. NAD83(2011) 2011 - 2022 0.01 meter 0.01 meter (CORS) NSRS Reference Basis Old Method - Ground Current Method - GNSS Stations Marks (Terrestrial) (CORS) Why Replace NAD83? • Datum based on best known information about the earth’s size and shape from the early 1980’s (45 years old), and the terrestrial survey data of the time. • NAD83 is NON-geocentric & hence inconsistent w/GNSS . • Necessary for agreement with future ubiquitous positioning of GNSS capability. Future Geometric (3-D) Reference Frame Blueprint for 2022: Part 1 – Geometric Datum • Replace NAD83 with new geometric reference frame – by 2022. -
Geographical Influences on Climate Teacher Guide
Geographical Influences on Climate Teacher Guide Lesson Overview: Students will compare the climatograms for different locations around the United States to observe patterns in temperature and precipitation. They will describe geographical features near those locations, and compare graphs to find patterns in the effect of mountains, oceans, elevation, latitude, etc. on temperature and precipitation. Then, students will research temperature and precipitation patterns at various locations around the world using the MY NASA DATA Live Access Server and other sources, and use the information to create their own climatogram. Expected time to complete lesson: One 45 minute period to compare given climatograms, one to two 45 minute periods to research another location and create their own climatogram. To lessen the time needed, you can provide students data rather than having them find it themselves (to focus on graphing and analysis), or give them the template to create a climatogram (to focus on the analysis and description), or give them the assignment for homework. See GPM Geographical Influences on Climate – Climatogram Template and Data for these options. Learning Objectives: - Students will brainstorm geographic features, consider how they might affect temperature and precipitation, and discuss the difference between weather and climate. - Students will examine data about a location and calculate averages to compare with other locations to determine the effect of geographic features on temperature and precipitation. - Students will research the climate patterns of a location and create a climatogram and description of what factors affect the climate at that location. National Standards: ESS2.D: Weather and climate are influenced by interactions involving sunlight, the ocean, the atmosphere, ice, landforms, and living things. -
DOTD Standards for GPS Data Collection Accuracy
Louisiana Transportation Research Center Final Report 539 DOTD Standards for GPS Data Collection Accuracy by Joshua D. Kent Clifford Mugnier J. Anthony Cavell Larry Dunaway Louisiana State University 4101 Gourrier Avenue | Baton Rouge, Louisiana 70808 (225) 767-9131 | (225) 767-9108 fax | www.ltrc.lsu.edu TECHNICAL STANDARD PAGE 1. Report No. 2. Government Accession No. 3. Recipient's Catalog No. FHWA/LA.539 4. Title and Subtitle 5. Report Date DOTD Standards for GPS Data Collection Accuracy September 2015 6. Performing Organization Code 127-15-4158 7. Author(s) 8. Performing Organization Report No. Kent, J. D., Mugnier, C., Cavell, J. A., & Dunaway, L. Louisiana State University Center for GeoInformatics 9. Performing Organization Name and Address 10. Work Unit No. Center for Geoinformatics Department of Civil and Environmental Engineering 11. Contract or Grant No. Louisiana State University LTRC Project Number: 13-6GT Baton Rouge, LA 70803 State Project Number: 30001520 12. Sponsoring Agency Name and Address 13. Type of Report and Period Covered Louisiana Department of Transportation and Final Report Development 6/30/2014 P.O. Box 94245 Baton Rouge, LA 70804-9245 14. Sponsoring Agency Code 15. Supplementary Notes Conducted in Cooperation with the U.S. Department of Transportation, Federal Highway Administration 16. Abstract The Center for GeoInformatics at Louisiana State University conducted a three-part study addressing accurate, precise, and consistent positional control for the Louisiana Department of Transportation and Development. First, this study focused on Departmental standards of practice when utilizing Global Navigational Satellite Systems technology for mapping-grade applications. Second, the recent enhancements to the nationwide horizontal and vertical spatial reference framework (i.e., datums) is summarized in order to support consistent and accurate access to the National Spatial Reference System. -
Part V: the Global Positioning System ______
PART V: THE GLOBAL POSITIONING SYSTEM ______________________________________________________________________________ 5.1 Background The Global Positioning System (GPS) is a satellite based, passive, three dimensional navigational system operated and maintained by the Department of Defense (DOD) having the primary purpose of supporting tactical and strategic military operations. Like many systems initially designed for military purposes, GPS has been found to be an indispensable tool for many civilian applications, not the least of which are surveying and mapping uses. There are currently three general modes that GPS users have adopted: absolute, differential and relative. Absolute GPS can best be described by a single user occupying a single point with a single receiver. Typically a lower grade receiver using only the coarse acquisition code generated by the satellites is used and errors can approach the 100m range. While absolute GPS will not support typical MDOT survey requirements it may be very useful in reconnaissance work. Differential GPS or DGPS employs a base receiver transmitting differential corrections to a roving receiver. It, too, only makes use of the coarse acquisition code. Accuracies are typically in the sub- meter range. DGPS may be of use in certain mapping applications such as topographic or hydrographic surveys. DGPS should not be confused with Real Time Kinematic or RTK GPS surveying. Relative GPS surveying employs multiple receivers simultaneously observing multiple points and makes use of carrier phase measurements. Relative positioning is less concerned with the absolute positions of the occupied points than with the relative vector (dX, dY, dZ) between them. 5.2 GPS Segments The Global Positioning System is made of three segments: the Space Segment, the Control Segment and the User Segment. -
Maintaining Geodetic Control for California
Maintaining California's Geodetic Control System Strategic Assessment Version 1.0 Approved by the California GIS Council: December 14, 2017 Prepared by the California GIS Council's Geodetic Control Work Group Maintaining California's Geodetic Control System Strategic Assessment Geodetic Control Work Group Members CHAIR: Scott P. Martin, PLS – California Department of Transportation Landon Blake, PLS – Hawkins and Associates Engineering John Canas, PLS – California Spatial Reference Center Tom Dougherty, PLS – City of Fremont Kristin Hart, GISP – Padre Associates, Inc. Justin Height, PLS – Guida Surveying Ryan Hunsicker, PLS – GISP – County of San Bernardino Bruce Joffe, GISP – GIS Consultant Neil King, PLS – King and Associates Michael McGee, PLS – Geodetic Consultant Ric Moore, PLS – Public sector Reg Parks, LSIT – Santa Rosa Junior College Mark S. Turner, PLS – California Department of Transportation PAST CHAIR: Marti Ikehara – National Geodetic Survey, California Geodetic Advisor, Retired Acknowledgement The Work Group would like to thank the geospatial professionals who provided peer review of this document. Their valued input was critical to the finalization for delivery to the California GIS Council. Disclaimer Statement The contents of this report reflect the views of the authors who are responsible for the facts and accuracy of the data presented herein. This publication does not constitute a standard, specification or regulation. This report does not constitute an endorsement by any entity, employer or department of any product -
TOPOGRAPHIC MAP of OKLAHOMA Kenneth S
Page 2, Topographic EDUCATIONAL PUBLICATION 9: 2008 Contour lines (in feet) are generalized from U.S. Geological Survey topographic maps (scale, 1:250,000). Principal meridians and base lines (dotted black lines) are references for subdividing land into sections, townships, and ranges. Spot elevations ( feet) are given for select geographic features from detailed topographic maps (scale, 1:24,000). The geographic center of Oklahoma is just north of Oklahoma City. Dimensions of Oklahoma Distances: shown in miles (and kilometers), calculated by Myers and Vosburg (1964). Area: 69,919 square miles (181,090 square kilometers), or 44,748,000 acres (18,109,000 hectares). Geographic Center of Okla- homa: the point, just north of Oklahoma City, where you could “balance” the State, if it were completely flat (see topographic map). TOPOGRAPHIC MAP OF OKLAHOMA Kenneth S. Johnson, Oklahoma Geological Survey This map shows the topographic features of Oklahoma using tain ranges (Wichita, Arbuckle, and Ouachita) occur in southern contour lines, or lines of equal elevation above sea level. The high- Oklahoma, although mountainous and hilly areas exist in other parts est elevation (4,973 ft) in Oklahoma is on Black Mesa, in the north- of the State. The map on page 8 shows the geomorphic provinces The Ouachita (pronounced “Wa-she-tah”) Mountains in south- 2,568 ft, rising about 2,000 ft above the surrounding plains. The west corner of the Panhandle; the lowest elevation (287 ft) is where of Oklahoma and describes many of the geographic features men- eastern Oklahoma and western Arkansas is a curved belt of forested largest mountainous area in the region is the Sans Bois Mountains, Little River flows into Arkansas, near the southeast corner of the tioned below. -
HORIZONTAL DATUM CONVERSIONS Helping Vermonters Visualize Choice
PART 3: SECTION K HORIZONTAL DATUM CONVERSIONS Helping Vermonters Visualize Choice A Discussion, Examples, and Recommended Conversion Methodology for the Transformation of ARC/INFO Coverages from the North American Datum of 1927 to the North American Datum of 1983 in Vermont. This paper would not have been made available without the thoughtful writing of Milo Robinson, NGS Geodetic Advisor to the State of Vermont, and Gary Smith of Green Mountain Geographics. These recognized leaders in the VGIS community have all of our thanks. EXECUTIVE SUMMARY This paper outlines the steps required to convert ARC/INFO coverages from the North American Datum of 1927 (NAD27) to the more accurate North American Datum of 1983 (NAD83). Until recently, most contemporary maps of Vermont used the NAD27 as the reference datum. This made it the logical option for direct digital conversion and subsequent inclusion in the Vermont GIS database. With the arrival of the new Vermont Digital Orthophotography, expanded GPS activity and new maps from the U.S. Geological Survey being prepared using NAD83, it is increasingly necessary to convert existing NAD27 data to NAD83 to properly incorporate new information. The need of particular data developers or users to convert data depends on the location in the State, and particular mapping requirements. As this paper is released the Vermont counties for which NAD83 digital orthophotos are available are Rutland, Windsor, Franklin, Grand Isle and Addison, plus portions of Washington County. The remainder of Washington and Orange Counties will be available soon, with the remainder of Vermont to be processed in coming years. The remainder of this paper provides more detail on the datum change, suggests new data entry guidelines, details the coordinate and naming convention for Vermont's orthophotos, and provides the procedures for converting Vermont's NAD27 data to NAD83 using software by ESRI (Environmental Systems Research Institute, Redlands, CA). -
Datums in Texas NGS: Welcome to Geodesy
Datums in Texas NGS: Welcome to Geodesy Geodesy is the science of measuring and monitoring the size and shape of the Earth and the location of points on its surface. NOAA's National Geodetic Survey (NGS) is responsible for the development and maintenance of a national geodetic data system that is used for navigation, communication systems, and mapping and charting. ln this subject, you will find three sections devoted to learning about geodesy: an online tutorial, an educational roadmap to resources, and formal lesson plans. The Geodesy Tutorial is an overview of the history, essential elements, and modern methods of geodesy. The tutorial is content rich and easy to understand. lt is made up of 10 chapters or pages (plus a reference page) that can be read in sequence by clicking on the arrows at the top or bottom of each chapter page. The tutorial includes many illustrations and interactive graphics to visually enhance the text. The Roadmap to Resources complements the information in the tutorial. The roadmap directs you to specific geodetic data offered by NOS and NOAA. The Lesson Plans integrate information presented in the tutorial with data offerings from the roadmap. These lesson plans have been developed for students in grades 9-12 and focus on the importance of geodesy and its practical application, including what a datum is, how a datum of reference points may be used to describe a location, and how geodesy is used to measure movement in the Earth's crust from seismic activity. Members of a 1922 geodetic suruey expedition. Until recent advances in satellite technology, namely the creation of the Global Positioning Sysfem (GPS), geodetic surveying was an arduous fask besf suited to individuals with strong constitutions, and a sense of adventure.