Autodesk 15606-011408-9330 User Guide - Page 157

Creating a Raster Layer

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Help Index buffers Help Index raster layers creating Another type of vector layer you can create is a buffer layer. Buffer layers are  created automatically when you use the View Buffer command in the Map Window popup menu; you cannot create them manually as you do with the other types of layers. You can modify a buffer layer using the Map Layer Properties dialog box as you would with the other layers, but because buffer layers are intended for buffers only, you can specify only a limited set of options. For more information, see "Creating Buffers Around Map Features" on page 141. Creating a Raster Layer When you add a raster map layer to a map, Autodesk MapGuide Author assumes that the raster images are in the same coordinate system as that used by the map file. You cannot edit raster images within Autodesk MapGuide Author; therefore, you must project them into the map's coordinate system using third-party image analysis and enhancement software before you create the raster map layers. You can create a raster map layer by referencing either a single raster image or a Raster Image Catalog (RIC) file. A RIC file lists all the raster image files that tile the area covered by a map or map layer. When you access a layer that references a RIC file, Autodesk MapGuide Server scans through the RIC file to determine the images or portions of images that correspond to the area being viewed. It then sends the data for that area only. Keep in mind that the RIC file is used only to determine which images might be visible. Each image that is referenced by the RIC file must have its own georeferencing file that indicates how to place this image correctly on a map. Autodesk MapGuide Author uses the information in the georeferencing file (not the information in the RIC file) to place the images in your map. The simplest way to generate RIC files is to use Raster Workshop, a utility available from the Autodesk MapGuide CD. You can use this utility to create a RIC file, add raster image files to it, subsample and merge the files, and more. For more information, see "Working with Raster Images" on page 101.  For step-by-step instructions on creating a raster layer, choose Help Contents, click the Index tab, and look up "raster layers, creating." Working with Map Layers in the Map Explorer | 157

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Working with Map Layers in the Map Explorer
|
157
Another type of vector layer you can create is a buffer layer. Buffer layers are
created automatically when you use the View
Buffer command in the Map
Window popup menu; you cannot create them manually as you do with the
other types of layers. You can modify a buffer layer using the Map Layer Prop-
erties dialog box as you would with the other layers, but because buffer layers
are intended for buffers only, you can specify only a limited set of options.
For more information, see
“
Creating Buffers Around Map Features
”
on
page 141.
Creating a Raster Layer
When you add a raster map layer to a map, Autodesk MapGuide Author
assumes that the raster images are in the same coordinate system as that used
by the map file. You cannot edit raster images within Autodesk MapGuide
Author; therefore, you must project them into the map
’
s coordinate system
using third-party image analysis and enhancement software before you
create the raster map layers.
You can create a raster map layer by referencing either a single raster image
or a Raster Image Catalog (RIC) file. A RIC file lists all the raster image files
that tile the area covered by a map or map layer. When you access a layer that
references a RIC file, Autodesk MapGuide Server scans through the RIC file
to determine the images or portions of images that correspond to the area
being viewed. It then sends the data for that area only.
Keep in mind that the RIC file is used only to determine which images might
be visible. Each image that is referenced by the RIC file must have its own
georeferencing file that indicates how to place this image correctly on a map.
Autodesk MapGuide Author uses the information in the georeferencing file
(not the information in the RIC file) to place the images in your map.
The simplest way to generate RIC files is to use Raster Workshop, a utility
available from the Autodesk MapGuide CD. You can use this utility to create
a RIC file, add raster image files to it, subsample and merge the files, and
more. For more information, see
“
Working with Raster Images
”
on page 101.
For step-by-step instructions on creating a raster layer, choose Help
Contents, click the Index tab, and look up
“
raster layers, creating.
”
Help Index
buffers
Help Index
raster layers
creating