ARCMAP GEOREFERENCE PDF

Persist the georeferencing information Raster data is obtained from many sources, such as satellite images, aerial cameras, and scanned maps. Modern satellite images and aerial cameras tend to have relatively accurate location information, but might need slight adjustments to line up all your GIS data. Scanned maps and historical data usually do not contain spatial reference information. In these cases you will need to use accurate location data to align or georeference your raster data to a map coordinate system.

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Deletes all the control points. Reset Transformation Resets the raster back to its original location. The control points are not deleted. Options Opens the Georeferencing Options window. Add Control Points Allows you to select control points from a layer and add them to the map.

Auto Registration Automatically creates links for your source raster, against a target raster. The source raster must be in a relatively close geographic location in order for the auto registration to work. Please refer to the Georeferencing a raster automatically help topic for steps to perform auto registration. Select Link Selects and highlights a link within the display.

Zoom To Selected Link Centers and zooms in to a selected link. If you want to zoom in farther, you can click this tool multiple times. Delete Link Deletes the selected link. Viewer Opens a viewer window that only displays the raster that you will be georeferencing. This window will allow you to georeference a raster using two windows. View Link Table Shows links and errors in tabular form. Rotate Rotates the source layer.

You can manually rotate the source layer, or you can type a degrees value in the measurement text box. Shift Shifts the source layer. You can manually shift the source layer, or you can type an x,y value in the measurement text box.

Scale Rescales the source layer. You can manually rescale the source layer, or you can type a rescale factor in the measurement text box. Measurement Type in the rotation angle, x,y shift, or rescale factor. Georeferencing toolbar buttons described The Georeferencing Options window allows you to specify default behaviors while you are georeferencing.

Georeferencing options and their functions Button Function From point symbol Opens the Symbol Selector window to allow you to choose any point symbol as your from-point. To point symbol Opens the Symbol Selector window to allow you to choose any point symbol as your to-point. Residual Opens the Symbol Selector window to allow you to choose any line symbol as your residual line.

Residual Check this box to show the residuals and RMS error in the link table. The residual shows you the error in the same units as the data frame spatial reference.

Inverse Residual Check this box to show the inverse residuals and inverse RMS error in the link table. The inverse residual shows you the error in the pixels.

This is a measure of how close your accuracy is, measured in pixels. First the transformation is used to find a point in the forward direction. Then that point is used with the inverse transformation and mapped back to image space. This second point is then compared to your from point that the link tool created. Auto complete Check this box to automatically show the user where the system thinks the corresponding to-point should be. Auto complete only works when you georeference your layer to another raster, after the first two points have been created.

When Auto complete finds a more suitable link pair, it may adjust the from-point that you specified. If no corresponding point can be found, you may need to manually specify the to-point. Georeferencing options described Image Viewer window The Image Viewer window is very useful when you are trying to georeference one raster dataset to another by allowing you to see both the source raster and the referenced layers at the same time.

This window displays the raster dataset you are trying to georeference in its own window. If you have dual monitors, you can drag the Image Viewer window to the second monitor. If you only have one monitor available, you can use the Split Screen button to divide your screen evenly for each window.

Image Viewer window buttons and their functions Button.

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Deletes all the control points. Reset Transformation Resets the raster back to its original location. The control points are not deleted. Options Opens the Georeferencing Options window. Add Control Points Allows you to select control points from a layer and add them to the map. Auto Registration Automatically creates links for your source raster, against a target raster.

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Overview of georeferencing

How To: Georeference an image to align with other data Summary Instructions provided describe how to georeference raster data to align correctly with other data. Procedure The general steps for georeferencing a raster dataset are: Add the raster dataset that aligns with the projected data. Add control points that link known raster dataset positions to known positions in map coordinates. Save the georeferencing information when the registration is satisfactory. For most rasters, the georeferencing information is stored in a separate file with the same name as the raster but with an. Permanently transform the raster by using the Rectify command on the georeferencing toolbar. The coordinate system assigned to the raster is the same as the coordinate system defined on the data frame the raster is part of.

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How To: Georeference an image to align with other data

Deletes all the control points. Reset Transformation Resets the raster back to its original location. The control points are not deleted. Options Opens the Georeferencing Options window. Georeferencing toolbar drop-down items described Georeferencing toolbar drop-down Options window The Georeferencing Options window allows you to specify default behaviors while you are georeferencing. Georeferencing Options dialog box controls Button or checkbox Function From point symbol Opens the Symbol Selector window to allow you to choose any point symbol as your from-point.

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Georeferencing a raster to a vector

Georeferencing a raster to a vector When georeferencing, you should look for well-defined objects within your images, such as road intersections or land features. This way you can be certain that you are referencing the same location in both the raster and aligned layers. You can georeference a raster dataset, a raster layer that contains raster functions, an image service, or a mosaic layer. Some of the Georeferencing options may be helpful to make your georeferencing task easier. Note: The Georeferencing toolbar layer list will display raster layers and CAD layers as valid data types. The layers must either be in the same coordinate system as the data frame or have no spatial reference defined. In ArcMap, add the layers residing in map coordinates and add the raster dataset you want to georeference.

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