1z0-595 Exam Dumps | Which three approaches can be used to make areas of a raster transparent when displayed using MapViewer?

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Question 19/75

Which three approaches can be used to make areas of a raster transparent when displayed using MapViewer?

A. Create a bitmap mask and use the bitmap_maskattribute of a georaster theme.

B. Set the pixels of the area to be made transparent to nodata values and use the transparent_nodataattribute in a georaster theme.

C. Update the spatial extent of the raster to the polygonal area that should not be transparent.

D. Delete the raster cells that should be transparent.

E. Specify a polygon representing an area that should be transparent and use the polygon_mask attribute of a georaster theme.

Correct Answer: A,B,E

Explanation/Reference:
B: transparent_nodata attribute (optional): Specifies if any GeoRaster NODATA value is to be rendered as transparent. The default value is "false".
E: polygon_mask attribute (optional): Specifies a set of two-dimensional coordinates representing a polygon, to be used as a mask to make transparent the part of the GeoRaster image that is outside the polygon mask. The coordinates are defined as x1,y1,x2,y2, . . . . The mask coordinates must be in the data coordinate space.
A: The <bitmap_masks> element contains one or more <mask> elements, each with a mask definition for a specific GeoRaster object.
The <mask> element has the following attributes:
zeromapping specifies the transparency value to be applied during rendering on bitmap pixels with a

value of 0 (zero). The attribute value can be from 0 (completely transparent) to 255 (completely opaque).
onemapping specifies the transparency value to be applied during rendering on bitmap pixels with a

value of 1. The attribute value can be from 0 (completely transparent) to 255 (completely opaque).
References: https://docs.oracle.com/cd/E17904_01/web.1111/e10145/vis_concepts.htm#JIMPV9536

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