Import-Mosaic-Reproject.pdf

Learning to Use GeoMedia Grid

Mini Tutorial:

Import, Mosaic, and Reproject Grid Layers

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Import, Mosaic, and Reproject Grid Layers

Mini-Tutorial

Table of Contents

Import, Mosaic, and Reproject Grid Layers with GeoMedia Grid ................................................ 1

Using this Tutorial ............................................................................................................................................................ 1

Tutorial Text Conventions ................................................................................................................................................ 1

Data Preparation .............................................................................................................................. 2

Opening a GeoWorkspace............................................................................................................................................... 2

Importing files................................................................................................................................................................... 2

Viewing and Displaying Grid Layers ................................................................................................................................ 4

Using the Mosaic Command to Mosaic the DEM Grid Layers ..................................................... 6

Using the Mosaic Command............................................................................................................................................ 6

View the Mosaic Result Layer in the Grid Edit Window................................................................................................... 6

Defining a New Study Area with a Specified Projection ............................................................... 8

Defining a New Study Area.............................................................................................................................................. 8

Using the Reproject/Copy Command............................................................................................. 9

Reprojecting the DEM Mosaic ......................................................................................................................................... 9

Reprojecting the Air Photo ............................................................................................................................................... 9

Import, Mosaic, and Reproject Grid Layers

Mini-Tutorial

Import, Mosaic, and Reproject Grid Layers

Mini-Tutorial

Import, Mosaic, and Reproject Grid Layers with GeoMedia Grid

Using this Tutorial

This tutorial is intended for those interested in using GeoMedia Grid commands to tile together

contiguous DEMs or to process layers representing the same area but with different resolutions, so

that they can be used together in grid analysis. To use the tutorial effectively, users should be

familiar with GeoMedia and have worked through the Learning to Use GeoMedia Grid introductory

tutorial.

Prerequisites

The aim of this tutorial is to demonstrate a typical workflow used to combine grid layers of differing

projections. The tutorial shows the user how to import, mosaic, and reproject a set of grid layers with

differing resolutions, datums, and elevation units.

Objectives

Topics covered in this tutorial include:

Workflow

•

Opening a GeoMedia GeoWorkspace

•

Importing SDTS DEM files and air photographs

•

Using GeoMedia Grid’s Layer commands to view the import results

•

Using the Mosaic command to tile together adjoining layers, and create a single, continuous

grid layer

•

Defining a New Study Area

•

Using the Copy/Reproject command to reproject layers into a common projection

Tutorial Text Conventions

•

In the left margin, key concepts are bolded, e.g., Key concept

Text conventions

•

Steps to be performed on the computer are marked with an arrow:

Menu names, dialog boxes, fields, and buttons are shown as: Menu name > choice

•

Information to be entered, either by selecting from a list or by typing, is shown as:

Information to be entered

•

Helpful hints are identified by a starburst:

•

The data set for this tutorial is in the folder \Program Files\GeoMedia Grid\MiniTutorials\Import to Mosaic

to Projection\Data. The data consists of six SDTS DEM layers and one digital air photograph of an area

near Huntsville, Alabama.

Data set

The DEM layers are referenced to Universal Transverse Mercator (UTM) projection, Zone 16 coordinates,

North American Datum of 1927 and have a resolution of 30 meters. Cell values give elevation in meters

above sea level. The layers represent the U.S.G.S. map sheets of Triana, Farley, New Hope, Madison,

Huntsville, and Moontown, Alabama. The data was produced by the U.S. Geological Survey (USGS) as

part of the National Mapping Program.*

The air photograph of Huntsville, Alabama is referenced to Universal Transverse Mercator (UTM)

projection, Zone 16 coordinates, North American Datum of 1983 and has a resolution of 16 meters. Cell

values are without units. The air photo was also produced by the USGS.*

*The provision of U.S. Geological Survey data does not imply sanctioning by the USGS, and does not constitute an endorsement of the

company Intergraph Corporation or its products.

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