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A marker image does not have to be small and opaque. A larger overlay image (with a transparent background) can be used to show particular features not included in the base map, such as a town's former walls (see the adjacent map, whic is using [[File:Leicester Town Walls map overlay.svg]] ).
The conventional method of finding a watershed boundary is to draw it by hand on a paper topographic map, or on a transparent overlay.The watershed area can then be estimated using a planimeter, by overlaying graph paper and counting grid cells, or the result can be digitized for use with mapping software.
Vector overlay is an operation (or class of operations) in a geographic information system (GIS) for integrating two or more vector spatial data sets. Terms such as polygon overlay, map overlay, and topological overlay are often used synonymously, although they are not identical in the range of operations they include.
The following examples document the use of the overlay_image parameter in the {{Location map+}} template. This parameter is also available via the {{ Location map }} and {{ Location map many }} templates.
Barrier-grid animation or picket-fence animation is an animation effect created by moving a striped transparent overlay across an interlaced image. The barrier-grid technique originated in the late 1890s, overlapping with the development of parallax stereography ( Relièphographie ) for 3D autostereograms .
A tiled web map, slippy map [1] (in OpenStreetMap terminology) or tile map is a map displayed in a web browser by seamlessly joining dozens of individually requested image or vector data files. It is the most popular way to display and navigate maps, replacing other methods such as Web Map Service (WMS) which typically display a single large ...
The 1987 Forgotten Realms Campaign Set was sold as a box set containing two 96-page books, four maps, and two clear plastic overlays marked with hex grids. [1] The maps were four full-color, 34" x 22" maps, two of which combine to form a large-scale (1" = 90 miles) map of the western half of the vast Realms continent, while the other two provide a more detailed (1" = 30 miles) map of the ...
To assist in determining the position of each overlay a coordinate grid showing from the left ordinates and from the top ordinates can be displayed by setting the grid parameter to yes: | grid = yes The coordinate grid is 900 x 900, so if the image is set to be smaller than this, the page content may be off scrolled, etc.