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Can a raster file be rendered in MapServer?
MapServer supports rendering a variety of raster file formats in maps. The following describes some of the supported formats, and what capabilities are supported with what formats. This document assumes that you are already familiar with setting up MapServer Mapfile, but does explain the raster specific aspects of mapfiles.
How is MapServer able to resample GDAL rasters?
MapServer is able to resample GDAL rasters on the fly into new projections. Non-GDAL rasters may only be up or down sampled without any rotation or warping. Raster warping kicks in if the projection appears to be different for a raster layer than for the map being generated.
What does one band classification mean in MapServer?
In particular this means that including even a single CLASS declaration in a raster layer will result in the raster layer being rendered using the one band classification rules instead of other rules that might have applied (such as 3 band RGB rendering). As of MapServer 4.4 support has been added for classifying non-8bit raster inputs.
Where do I find the layer name in MapServer?
Can be specified relative to the SHAPEPATH option from the Map Object. If this is an SDE layer, the parameter should include the name of the layer as well as the geometry column, i.e. “mylayer,shape,myversion”.
How is MapServer used to make pseudo colored maps?
Traditionally MapServer has been used to produce 8 bit pseudo-colored map displays generated from 8bit greyscale or pseudocolored raster data. However, if the raster file to be rendered is actually 24bit (a red, green and blue band) then additional considerations come into play.
Do you need a DATA statement in MapServer?
No DATA statement is required because MapServer will fetch the filename of the raster files from the Location attribute column in the hp2.dbf file for records associated with polygons in hp2.shp that intersect the current display region. The polygons in hp2.shp should be rectangles representing the footprint of the corresponding file.