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##### This module helps you build an intuition for and understanding of datums in spatial and geospatial networks, within the broader context of network design. It covers the following:
• The concept of a datum and the meaning of the term datum defect
• A suite of examples meant to help you make sure you understand the problems of translation, rotation, and scale as they relate to datum defects
• An introduction to datum constraints for 1D, 2D, and 3D networks
• The definition of Ordinary Minimum Constraints for 1D, 2D, and 3D networks
• Treatment of external constraints and inner constraints
• A simple but full example of inner constraints so you can see how such constraints work
• A simple framework for network design

## My own notes

I’m still assuming that you’re building your own “perfect set of notes” as you go through this material – to make sure you have a succinct reference to help you be efficient on a test or in your future work. So, I’m sharing my own notes here with you to help with that.

## The self-assessment problems

My usual practice in a course like this is to share some problems with you so you can assess your understanding of the material. These are embedded after the lessons below.

So, dig into these problems either after you’ve finished looking at the material or as you go. Hustle to figure out the answers. Leave no stone unturned. Get help if you need it. Like the notes, I’m going to assume you’re building the “perfect set of reference problems” to help you be efficient in a test or to look back at in practice.

If you’re taking this course from me as part of a university class then these are a great way to study. I can’t ask exactly the same questions on a test, of course, but I do generally design the problems in a way that you can expect to do as well in the formal assessments as you can do on these self-assessment questions.

And there’s also a lab that integrates quite closely with this material. (Stay tuned for the link.) I recommend doing this as you go through this module.

Okay, now get started by clicking through the lessons below!