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GIS

Weltraumkatze Fanroth Deutsch 33 Karten

GIS

Karten in diesem Stapel (33)

  1. 1Was zeichnet spatial reference aus ?- The coordinate system (GCS or PCS & VCS)
    -The spatial extent covered by the dataset (Ausdehnung)
    - Coordinate prescision with coordinate are stored (Koordinatengenauigkeit)
    -Processing tolerances (Bearbeitungstoleranz)
  2. 2Was enthält das Vertikal-Koordinatensystem (VCS) (Vertical coordinate system)- Linear unit of measure (i.d.R. m or ft)
    - Geodectic or vertical Datum
    - Axis direction
    -Vertical shift (verschiebung)
  3. 3Was umfasst das Projizierte Koordinatensystem (PCS) ?- GCS
    - Projection ( and project. parameters)
    - Linear unit measure ( usually m or ft)
  4. 4Was beinhaltet ein Geographisches Koordinatensystem ( GCS)?- Angular unit of measur (usually degrees)
    - Prime median
    - Datum (including spheroid)
  5. 5Was geben Koordinatensysteme an? Coordinate system specify- A Projected or Geographic measurment framework
    - Units of measurment
    - A defined map projection
    - Datums and spheriod, plus possible shift, central meridians and standard parallels.
  6. 6Was ist der Tisso Index ?A method of investigating how map projections can distort the Earths surface going from a 3D to a 2D projection.
  7. 7What means " Great circle" ?= shortest distance between two points an a sphere ( called a Geodesic in Mathematics)
  8. 8Wie lautet das Datum vom Mittelpunkt der Erde?Ellipsoid - GRS 80
    Datum - NAD 83
  9. 9Was versteht man unter "Datum" ?Datums are collections of poinst of "known" accuracy that are used to georefernce map data
  10. 10Wie liegen die semi-minor axis & semi-major axis ?semi-minor
    I
    I
    -----------
    semi-major
  11. 11—SphereSphere
  12. 12—GeoidGeoid
  13. 13—EllipsoidEllipsoid
  14. 14What is Remote Sensing?"The science and art of obtaining useful information about an object, area or phenomenon through the analysis of data acquired by a device that is not in contact with the object, area or phenomenon under investigation"
  15. 15Was ist GIS?"GISs are simultaneously the telescope, the microscope, the computer and the Xerox machine of regional analysis and synthesis of spatial data"
  16. 16Nennen sie 4 Eigenschaften von Projectionen1. Angular conformity, or preservation of shapes ( conformal proj.)
    2. Preservaton of distance ( equivalent proj.)
    3. Preservation of area ( equivalent proj.)
    4. Preservation of direction (azimuthal proj.)
  17. 17Was ist Lidar?-Lidar ist a laser based active remote sensing technique that can operate from space based, airbone or ground based plattforms and provide very accurate 3D data.
    - It requires an emmitter-reciver, plus accurate GPS and IMU information
    - It can rapidly provide, bare earth high resolution DEM.
    - Uses include geomorphological mapping and fault identifikaton and analysis
  18. 18Slope and AspectThe rate of change of elevation in both the x and y direction can be used to identify the direction and magnitude of steppest gardient
  19. 19Was ist das?TIN vector data structureWas ist das?
  20. 20—DEM vector data structureDEM vector data structure
  21. 21What means TINsTriangulated Irregular Networks
    " A vector data structure that partitions geographic space into contiguous, non-overlappig triangles. The vertices of each triangle are sample data points with x-,y-,z- values."
  22. 22Pro Vector- Data can be represented in its original resolution
    -requires les storage space
    - Topological relationships maintained
    - Geographical output visually pleasing
  23. 23Contra Vector- More complex data structure
    - inefficient for RS data
    - Some spatial analysis procedures are complex an process intensive
    - overlaying multi. vector maps is often time consuming
  24. 24Pro Raster-Simple data structure
    - Efficent for RS or scanned data
    - Simple spatial analysis procedures
  25. 25Contra Raster- Requires greater storage space
    - Graphical output my be less pleasing
    - Projection transformations difficult
  26. 26Für was steht DTM?Digital Terrain Model
    (Digitales Geländemodel)
  27. 27Für was steht DEM?Digital Elevation Model
    (Digitales Höhenmodel)
  28. 28Pro und Contra Device inputpro:
    - fast
    -Less chance of error
    - can be done in the field with wireless potential
    contra:
    -Requires equipment
    -More specialist expertise
    - Limited information
  29. 29Pro und Contra Scanningpro:
    -Format adaptible
    - Good for converting paper products..
    - fast
    contra:
    -Possible distortion errors
    - Expensive...?
    -Requires equipment
  30. 30Pro und contra Keyboard entrypro:
    -Format adaptible
    -Good for tables of raw data
    -User understanding
    contra:
    - Time consuming
    -Prone to error
  31. 31Pro und Contra DigitisingPro:
    -Format adaptible
    -Good fpr converting paper products
    contra:
    - Time consuming
    - Prone to error
    - Expensive
    - Requires equipment
  32. 32Abstracting the real World: Problems to be considered- The real World is dynamic, not static
    - some features are continuous, some not
    - The scale of the realworld my not match our data
  33. 33What includes GIS ?-Coordinate systems can be GCS, PCS or VCS
    - PCS are GCS that habe undergone proj. and given prativular spatial attributes.
    - The Spatial Reference System of a GIS includes a coordinate system, extents resolution and tolerence

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Beschreibung
Klausurvorbereitung
Erstellt von
Weltraumkatze Fanroth · Mär 2016
Aktualisiert
23 Mär 2016
Aufrufe
160
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