Raster Map Logic

We propose a GeoTIFF library to handle raster map. This library is programmed in C. The operation are function calls that can be called from a Mapscript wrapper.

Table of Content

Blend out Image

When we zoom in a raster map, we see, at a high resolution scale, the pixel structure of the map. Also we want that new vector layers are blended in, witch should me more visible and predominant that the background raster. We can of course hide the background raster from a give resolution scale. But with a supplementary blending out of the raster, we get a more smooth view of the map during zooming.

Make Gray Image

To be capable to compute data of a raster map, it is often necessary to have the raster in gray scale colour.

Change Colour Scale

A raster map can be in some colour witch don't fit with the colours of other layers, witch we wound to display. There for we should be in measure to change the false colour range of the raster.

Average a Set of Raster

A raster map can for example change during time. If we wound to show a average raster, we must be capable to average a set of raster images.

Filter Colour

Generate a Image Mask

Compute Surface and Perimeter of a Region

Mask Logic AND, OR or XOR

Layer to Raster and vice versa

-- RalfSchaer - 2009-12-16