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Geo referencing

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Jaweria Shamshad

Geo-referencing is GIS based spatial analysis technique which is discussed in this presentation.For video you can see following link: https://www.youtube.com/watch?v=h559lOsvOU8&feature=youtu.be&fbclid=IwAR3PB9YB4i86zrYyzxbiz_g2-4_ujowdO1gfm4Lz5E3vGf56Fn5DAzeUA_8

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Geo referencing
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GEOREFERENCING GIS (BASIC COURSE) By Dr. Jaweria Shamshad Ph.D. Environmental Sciences College of Earth and Environmental Sciences University of the Punjab, Lahore 3
Dr. Jaweria Shamshad, CEES , University of the Punjab Georeferencing "Georeferencing is the process of aligning the raster dataset, with the help of real world coordinates, to its actual position on the earth (globe). Raster data is commonly obtained by scanning maps or collecting aerial photographs and satellite images, these datasets dont normally contain spatial reference information. With aerial photography and satellite imagery, sometimes the location information delivered with them is inadequate and the data does not align properly with other data you have. When you geo-reference your raster dataset, you define its location using map coordinates and assign the coordinate system of the data frame. Georeferencing raster data allows it to be viewed, queried, and analyzed with other geographic data.
Dr. Jaweria Shamshad, CEES , University of the Punjab Steps to do georeferencing The general steps for georeferencing a raster dataset are: Add the raster dataset that you want to align with your projected data in ArcMap. Add control points that link known raster dataset positions to known positions in map coordinates. Save the georeferencing information when youre satisfied with the alignment (also referred to as registration). Optionally, permanently transform the raster dataset.
Dr. Jaweria Shamshad, CEES , University of the Punjab Types of georeferencing There are two general types of georeferencing, that are: 1) Absolute Geo-referencing The image is georeferenced by taking GCPs (Ground Control Points) with the help of GPS device, Google earth, Topo sheets etc. 2) Relative Geo-referencing (Image to Image Registration) The image is georeferenced with the help of another already georeferenced image
Dr. Jaweria Shamshad, CEES , University of the Punjab GCP (Ground Control Point) Ground Control Point (GCP) could be defined as a point on the surface of the earth of known location (i.e. fixed within an established co-ordinate system) which is used to geo-reference image data sources, such as remotely sensed images or scanned maps. It is also known as Control Point (CP).
Dr. Jaweria Shamshad, CEES , University of the Punjab GCP (Ground Control Point) Ground Control Point (GCP) could be defined as a point on the surface of the earth of known location (i.e. fixed within an established co-ordinate system) which is used to geo-reference image data sources, such as remotely sensed images or scanned maps. It is also known as Control Point (CP).
Geo referencing
Geo referencing

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Geo referencing

  • 3. GEOREFERENCING GIS (BASIC COURSE) By Dr. Jaweria Shamshad Ph.D. Environmental Sciences College of Earth and Environmental Sciences University of the Punjab, Lahore 3
  • 4. Dr. Jaweria Shamshad, CEES , University of the Punjab Georeferencing "Georeferencing is the process of aligning the raster dataset, with the help of real world coordinates, to its actual position on the earth (globe). Raster data is commonly obtained by scanning maps or collecting aerial photographs and satellite images, these datasets dont normally contain spatial reference information. With aerial photography and satellite imagery, sometimes the location information delivered with them is inadequate and the data does not align properly with other data you have. When you geo-reference your raster dataset, you define its location using map coordinates and assign the coordinate system of the data frame. Georeferencing raster data allows it to be viewed, queried, and analyzed with other geographic data.
  • 5. Dr. Jaweria Shamshad, CEES , University of the Punjab Steps to do georeferencing The general steps for georeferencing a raster dataset are: Add the raster dataset that you want to align with your projected data in ArcMap. Add control points that link known raster dataset positions to known positions in map coordinates. Save the georeferencing information when youre satisfied with the alignment (also referred to as registration). Optionally, permanently transform the raster dataset.
  • 6. Dr. Jaweria Shamshad, CEES , University of the Punjab Types of georeferencing There are two general types of georeferencing, that are: 1) Absolute Geo-referencing The image is georeferenced by taking GCPs (Ground Control Points) with the help of GPS device, Google earth, Topo sheets etc. 2) Relative Geo-referencing (Image to Image Registration) The image is georeferenced with the help of another already georeferenced image
  • 7. Dr. Jaweria Shamshad, CEES , University of the Punjab GCP (Ground Control Point) Ground Control Point (GCP) could be defined as a point on the surface of the earth of known location (i.e. fixed within an established co-ordinate system) which is used to geo-reference image data sources, such as remotely sensed images or scanned maps. It is also known as Control Point (CP).
  • 8. Dr. Jaweria Shamshad, CEES , University of the Punjab GCP (Ground Control Point) Ground Control Point (GCP) could be defined as a point on the surface of the earth of known location (i.e. fixed within an established co-ordinate system) which is used to geo-reference image data sources, such as remotely sensed images or scanned maps. It is also known as Control Point (CP).
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