Projections & GIS Data Collection: An Overview

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1 Projections & GIS Data Collection: An Overview Projections Primary data capture Secondary data capture Data transfer Capturing attribute data Managing a data capture project

2 Geodesy Basics for Geospatial Data Geodesy: The study of the Earth s size and shape. - or, more formally: A branch of applied mathematics which determines by observation and measurement the exact positions of points and the figures and areas of large portions of Earth's surface, the shape and size of the Earth, and the variations of terrestrial gravity.

3 Ellipsoid (Spheroid) major axis half axis: semi-major axis (a) minor axis half axis: semi-minor axis (b)

4 The History of Ellipsoids Because the Earth is not shaped precisely as an ellipsoid, initially each country felt free to adopt its own as the most accurate approximation to its own part of the Earth Today an international standard has been adopted known as WGS 84 Its US implementation is the North American Datum of 1983 (NAD 83) Many US maps and data sets still use the North American Datum of 1927 (NAD 27) Differences can be as much as 200 m

5 Projections and Coordinates There are many reasons for wanting to project the Earth s surface onto a plane, rather than deal with the curved surface The paper used to output GIS maps is flat Flat maps are scanned and digitized to create GIS databases Rasters are flat, it s impossible to create a raster on a curved surface The Earth has to be projected to see all of it at once It s much easier to measure distance on a plane

6 Need a link between: Geodetic Datums geoid -- ellipsoid -- sphere How do we know where locations referenced in the geographic coordinate system are relative to the ellipsoid and geoid? Geodetic datums provide this link Datum defined: any numerical or geometric quantity which serves as a reference or base for other quantities a geodetic datum is a reference for mapping

7 Geodetic Control Network Horizontal datum- has connections from origin to other points network of these points at surveyed locations: geodetic control network UNC -Chapel Hill - main quad

8 Datum Info on a Map Must have this information in order to utilize geospatial data Why?

9 Latitude and Longitude The most comprehensive and powerful method of georeferencing Metric, standard, stable, unique Uses a well-defined and fixed reference frame Based on the Earth s rotation and center of mass, and the Greenwich Meridian

10 Definition of Latitude Requires a model of the Earth s shape The Earth is somewhat elliptical The N-S diameter is roughly 1/300 less than the E-W diameter More accurately modeled as an ellipsoid than a sphere An ellipsoid is formed by rotating an ellipse about its shorter axis (the Earth s axis in this case)

11 Geographic Coordinates spherical coordinate system unprojected! expressed in terms of two angles (latitude & longitude) longitude: angle formed by a line going from the intersection of the prime meridian and the equator to the center of the earth, and a second line from the center of the earth to the point in question latitude: angle formed by a line from the equator toward the center of the earth, and a second line perpendicular to the reference ellipsoid at the point in question

12 Definition of longitude. The Earth is seen here from above the North Pole, looking along the Axis, with the Equator forming the outer circle. The location of Greenwich defines the Prime Meridian. The longitude of the point at the center of the red cross is determined by drawing a plane through it and the axis, and measuring the angle between this plane and the Prime Meridian.

13 Geographic Coordinates latitude positive in n. hemisphere negative in s. hemisphere longitude positive east of Prime Meridian negative west of Prime Meridian

14 Cartesian Coordinates Computationally, it is much simpler to work with Cartesian coordinates than spherical coordinates x,y coordinates referred to as eastings & northings defined units, e.g. meters, feet common examples: Universal Transverse Mercator: Cartesian coordinate system applicable nearly world-wide Many countries also have Cartesian systems U.S. - State Plane U.K. - Ordnance Survey National Grid

15 Distortions Any projection must distort the Earth in some way Two types of projections are important in GIS Conformal property: Shapes of small features are preserved: anywhere on the projection the distortion is the same in all directions Equal area property: Shapes are distorted, but features have the correct area Both types of projections will generally distort distances

16 Cylindrical Projections Conceptualized as the result of wrapping a cylinder of paper around the Earth The Mercator projection is the best-known cylindrical projection The cylinder is wrapped around the Equator The projection is conformal At any point scale is the same in both directions Shape of small features is preserved Features in high latitudes are significantly enlarged

17 Conic Projections Conceptualized as the result of wrapping a cone of paper around the Earth Standard Parallels occur where the cone intersects the Earth The Lambert Conformal Conic projection is commonly used to map North America On this projection lines of latitude appear as arcs of circles, and lines of longitude are straight lines radiating from the North Pole

18 The Universal Transverse Mercator (UTM) Projection A type of cylindrical projection Implemented as an internationally standard coordinate system Initially devised as a military standard Uses a system of 60 zones Maximum distortion is 0.04% Transverse Mercator because the cylinder is wrapped around the Poles, not the Equator

19 Universal Transverse Mercator (UTM) 60 zones, each 6 longitude wide zones run from 80 S to 84 N poles covered by Universal Polar System (UPS)

20 Universal Transverse Mercator (UTM) Transverse Mercator projection applied to each 6 zone to minimize distortion

21 Universal Transverse Mercator (UTM) Units: meters Each 6 zone subdivided into North and South zones N and S zones have separate coordinate systems x-origin set 500,000m east of central meridian N zone y-origin: Equator S zone y-origin: 10,000,000m south of Equator

22 State Plane Coordinates Defined in the US by each state Some states use multiple zones Several different types of projections are used by the system Provides less distortion than UTM Preferred for applications needing very high accuracy, such as surveying

23 U.S. State Plane Coordinate System Each U.S. state composed of one or more zones Zones trend predominantly N-S or E-W Each zone has separate coordinate system and appropriate projection

24 Data Collection One of most expensive GIS activities Many diverse sources Two broad types of collection Data capture (direct collection) Data transfer Two broad capture methods Primary (direct measurement) Secondary (indirect derivation)

25 Data Collection Techniques Raster Vector Primary Secondary Digital remote sensing images Digital aerial photographs Scanned maps DEMs from maps GPS measurements Survey measurements Topographic surveys Data sets from atlases

26 Stages in Data Collection Projects Planning Evaluation Preparation Editing / Improvement Digitizing / Transfer

27 Primary Data Capture Capture specifically for GIS use Raster remote sensing e.g. SPOT and IKONOS satellites and aerial photography Passive and active sensors Resolution is key consideration Spatial Spectral Temporal

28 Typical Reflectance Signatures

29 Vector Primary Data Capture Surveying GPS Locations of objects determines by angle and distance measurements from known locations Uses expensive field equipment and crews Most accurate method for large scale, small areas Collection of satellites used to fix locations on Earth s surface Differential GPS used to improve accuracy

30 Secondary Geographic Data Capture Data collected for other purposes can be converted for use in GIS Raster conversion Scanning of maps, aerial photographs, documents, etc Important scanning parameters are spatial and spectral (bit depth) resolution

31 Vector Secondary Data Capture Collection of vector objects from maps, photographs, plans, etc. Digitizing Manual (table) Heads-up and vectorization Photogrammetry the science and technology of making measurements from photographs, etc.

32 Tablet Digitizing & Scanning Developing data from analog (paper) maps -- convert information from the analog map into digital form process called digitzing, accomplished using: tablet digitizer -or- scanner Both approaches require good quality source maps free of physical distortion (wrinkling, shrinkage) coordinate information visible on map statement of projection, coordinate units, datum, etc. Tablet digitizing trace map from tablet assign attributes Scanning scan map to create digital picture trace picture on-screen or using vectorization software assign attributes

33 contains fine ( ) mesh of electromagnetically charged wire common grid resolutions & pucks lead to accuracies ranging from.05mm to.25mm. Puck- recognizes position on tablet relative to wire mesh. records coordinates of location tablet in digitizer units (e.g. inches, mm). Digitizing software accepts coordinate information from digitizer& converts from digitizer coordinates to map coordinates. assembles digitized coordinates into geographic data objects (points, lines, polys). Tablet Digitizer & Software

34 Digitizing Geographic Features Generally digitize one "layer" (set of related features) from the map at a time e.g digitize roads separately from hydrography, etc. each digitized set of features becomes a separate vector data layer in GIS Trace the features from the map using the digitizing puck digitize a single x-y location for point feature digitize a series of points to form a line feature endpoints of lines are nodes points defining shape along lines are vertices digitize a series of lines to form a polygon Feature digitizing issues: coordinate entry mode: point mode -vs. vs.- stream mode common polygon borders treat arcs/lines forming common boundaries as separate entities? or enter common arcs/lines only once? major topological consequences...

35 Automation During Tablet Digitizing Digitizing is tedious and error prone Software can help by automating certain steps during digitizing increase efficiency and reduce error Examples: node snapping - automatically join ends of lines (nodes) together if they fall within a specified distance tolerance node-line snapping - automatically join end of one line (a node) to an existing line if the node falls within a specified distance of the existing line intersection detection - automatically detect when two lines cross and create a node at the intersection point

36 Scan Digitizing Alternative method for digitizing... sometimes called automatic digitizing.but it isn t necessarily very automatic Equipment scanner "large-format" scanners available as flat-bed or roller scanners scanner "takes picture" of map -- creates a raster image software capabilities to read scanned image display image on screen for "heads-up" digitizing or to do automatic vectorization

37 Factors Affecting Accuracy Source map inherent spatial resolution of source map (dependent on map scale) positional & attribute coding errors present in source map physical condition of map Digitizing or scanning process care with which map is affixed to digitizing tablet (digitizing) accuracy of coordinate registration from tablet coordinates (digitizing) or image coordinates (scanning) to real-world coordinates operator error while digitizing, or while vectorizing scanned image operator error while assigning attribute codes to digitized/scanned spatial data features Post-processing effects of generalization, edge matching, rubber sheeting, etc.

38 Managing Data Capture Projects Key principles Clear plan, adequate resources, appropriate funding, and sufficient time Fundamental tradeoff between Quality, speed and price Two strategies Incremental Blitzkrieg (all at once) Alternative resource options In house Specialist external agency

39 Definitions Database an integrated set of data on a particular subject Geographic (=spatial) database - database containing geographic data of a particular subject for a particular area Database Management System (DBMS) software to create, maintain and access databases

40 Advantages of Databases over Files Avoids redundancy and duplication Reduces data maintenance costs Applications are separated from the data Applications persist over time Support multiple concurrent applications Better data sharing Security and standards can be defined and enforced

41 Disadvantages of Databases Expense Complexity Performance especially complex data types Integration with other systems can be difficult

42 Distributed GIS: Outline Introduction Distributing the data The mobile user Distributing the software: GIServices

43 Distributing a GIS The component parts can be at different locations The user The data The software The network links all of the parts together

44 The Role of Standards Distributed GIS relies on the adoption of common standards To allow the various components to operate together Such standards have been developed by various national and international bodies, aided by the Open Geospatial Consortium

45 Distributing the Data It must be possible to find remotely located data Data documentation, or metadata, provides the key to successful search The U.S. Federal Geographic Data Committee devised a much-emulated standard for geographic data description The Content Standard for Digital Geospatial Metadata

46 Major Features of FGDC Metadata 1. Identification Information: basic information about the data set 2. Data Quality Information: a general assessment of the quality of the data set 3. Spatial Data Organization Information: the mechanism used to represent spatial information in the data set 4. Spatial Reference Information: the description of the reference frame for, and the means to encode, coordinates in the data set 5. Entity and Attribute Information: details about the information content of the data set, including the entity types, their attributes, and the domains from which attribute values may be assigned 6. Distribution Information: information about the distributor of and options for obtaining the data set 7. Metadata Reference Information: information on the currentness of the metadata information, and the responsible party 8. Citation Information: the recommended reference to be used for the data set 9. Time Period Information: information about the date and time of an event 10. Contact Information: identity of, and means to communicate with, person(s) and organization(s) associated with the data set

47 Geolibraries and Geoportals A Geolibrary is a digital library containing georeferenced information Its search mechanism uses geographic location as the primary key A Geoportal is a digital library of geographic data and GIServices A one-stop shop for information relevant to GIS

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