MICRODEM Program Overview
MICRODEM is a Geographical Information system (GIS)
which manipulates digital
map data. All data used must be registered to fully benefit from the
the data has earth coordinates associated.
While the program has some capabilities to create and register
data sets, this requires a high degree of user sophistication and
is not recommended for most users, and is not a major focus of program
Users of GIS must be aware of the
following mapping issues:
- Datums. The wrong datum
can shift coordinates up to hundreds of meters, and the
GIS software cannot always automatically detect and
correct for different datums, so the user must have a basic
understanding of the difference between NAD27 and NAD83/WGS84. Users should also
recognize that they may have to check the metadata with their data to learn
about the datum and projection used.
- The difference between geographic Lat/Long coordinates and projected coordinate systems. Software can easily convert one to the other,
but some operations may require that the two data
sets share the same coordinate system.
- Vector and raster digital map data,
and the difference between
data like a satellite image or a DEM elevation and
"subjective" data like interpreted plate
boundaries or a geologic map.
- The difference between screen resolution and data
resolution. Many GIS data sets cannot be displayed on
screen at full resolution. The program must either subsample
to show the big picture, subset the area to show a small
area at full resolution, or use scrollbars. With the
last two options it can be hard to recognize where in the
data set you are looking.
Basics of running MICRODEM.
Introduction to Data
- Edits to databases are immediate. Because of this, you must
check to enable edits on the database display table. You can save a
copy of the database before you work, using the Report
- Edits to grids/DEMs do not take effect unless you deliberately save
the grid/DEM, because these are stored in memory for rapid manipulation, and
when you save, you can save them to a new file.
Program History: how a
great program like this evolved.
Product Gallery. Samples of the
imagery the program produces, with links to how they are created.
history. See how many people are getting MICRODEM.
Contact the program author with
comments and suggestions using the online MD forum
hosted by Delphi. You should also check the debug