Rubber Sheet Transformation In Gis

Geometric distortions commonly occur in source maps.

Rubber sheet transformation in gis.

You can press and hold the spacebar to temporarily turn off snapping as you create anchor points and draw displacement links or rubber sheet area polygons. The modify features pane appears. Used to control rubber sheeting and adjustment operations. The input link features represent the regular links.

The input point features represent identity links that hold source positions unmoved during the rubbersheeting process. It makes possible comparing and overlaying multiple maps from different time periods. Rubbersheeting makes spatial adjustments to align the input feature locations with more accurate target feature locations based on the specified rubbersheet links. Geometric correction of them.

Rubber sheeting is a useful technique in historical gis where it is used to digitize and add old maps as feature layers in a modern gis. The graphic below illustrates the four possible changes. Click either the natural neighbor or linear method and click ok. Click the spatial adjustment menu and click options.

Click the spatial adjustment menu point to adjustment methods then click a transformation method. X ax by c y dx ey f. Affine similarity and projective. Root mean square error measure of registration accuracy used during digitizing and coverage transformations.

Click the spatial adjustment menu point to adjustment methods then click rubbersheet to set the adjustment method. Click the spatial adjustment menu and click options. They may be introduced by imperfect registration in map compilation lack of geodetic control in source data or a variety of other causes. Click rubbersheet for the adjustment method so you can set additional options for rubbersheeting.

By default arcmap supports three types of transformations. Click the options button. Click the general tab. The affine transformation function is.

Qgis is a free open source gis package. Rubber sheeting topological process of stretching or shrinking a subarea or portion of a map or image to fit in registration with selected control points. Cadcorp spatial information system software sis map modeller is offering a tool for rubbersheeting data layers. Rubbersheeting is used to make small geometric adjustments in your data usually to align features with more accurate information.

On the edit tab in the features group click modify. Expand alignment and click transform. Rubber sheeting may improve the value of such sources and make them easier to compare to modern maps. An affine transformation can differentially scale the data skew it rotate it and translate it.

Click the adjustment methods drop down arrow and click rubbersheet.